শুক্রবার, ৩০ নভেম্বর, ২০১২

54.5 MPG and Beyond: Fueling Energy-Efficient Vehicles

For many, refueling their vehicle can be disappointing. It?s the only activity where consumers watch the cost add up, dollar by dollar, quickly eating up disposable income. And much of that money goes right out the tail pipe -- only 14-26 percent of the energy from fuel is used to move a vehicle down the road.

Fortunately, the Obama Administration?s new national fuel economy standards for passenger vehicles will improve vehicle efficiency and save Americans money at the pump, all while reducing our dependence on foreign oil and growing the U.S. economy.

Finalized in August, the new standards build on the Obama Administration?s first set of fuel economy increases -- the first increase since 1985 -- that raised the average fuel economy of passenger vehicles to 35.5 miles per gallon by 2016. Under the new rules, cars and light-duty trucks built for model years 2017-2025 are expected to achieve industry-average fuel efficiency equivalents of 54.5 miles per gallon by 2025 -- nearly double the efficiency of cars on the road today.

These changes in vehicle efficiency will directly benefit consumers. By 2025 Americans can expect to save an estimated $8,200 in fuel costs over the lifetime of a new vehicle -- or almost four years worth of gasoline costs for the average household. The standards will also help clean the air we breathe, reducing greenhouse gas emissions by more than 65 percent compared to cars in 2016 and cutting other pollutants that cause soot and smog.

While the standards are based on an industry average fuel economy goal, a manufacturer?s individual requirements depend on the vehicles it produces. This helps preserve consumer choice, meaning Americans can still buy the vehicle that best fits their needs. Consumers don?t have to wait until 2025 to start saving. They are already seeing more efficient vehicles in the showrooms as a result of President Obama?s first round of fuel economy standards, and consumers are responding positively. The average fuel economy of new cars sold in October reached an all-time high of 24.1 miles per gallon, according to the University of Michigan?s Transportation Research Institute.

Improving light-duty vehicle fuel economy is also one of the fastest ways to reduce our dependence on foreign oil, helping to build an American economy to last. The program will save an estimated 12.2 billion barrels of oil, and by 2025 the standards will cut oil consumption by an estimated 2.2 million barrels a day. The fuel economy program alone with get us more than halfway to President Obama?s goal of cutting oil imports by a third by 2025.

Currently there is a wide range of technologies available to help automakers meet the standards, but achieving these historic goals will also require innovative new technologies and manufacturing. This innovation will spur economic growth and create high-quality domestic jobs. Employing 700,000 Americans, the auto industry is the lifeblood of U.S. manufacturing, and the Environmental Protection Agency estimates the new fuel economy standards will create more than 148,000 jobs from 2017-2025.

At the Energy Department, we are working to promote the innovation required to meet the new fuel economy standards, while making America more competitive and creating the jobs of tomorrow here at home. We are investing in groundbreaking research that will result in cars that have more efficient engines, weigh less and drive further.

Over the next few weeks, we will be highlighting companies and the technologies they are developing -- with the help of the Energy Department -- to reduce vehicle fuel consumption. Be sure to check on Energy.gov to learn about the advancements that will get us to 54.5 mpg by 2025.?

Source: http://energy.gov/articles/545-mpg-and-beyond-fueling-energy-efficient-vehicles

marinol flight attendant pau gasol trade michael madsen spring forward day light savings day light savings

Recreational Sport ? Steps to Follow When Choosing Your Leisure ...

How do you know which recreational sport is right for you? Though this is a simple question, it may not have a simple answer. Before answering this question, it makes sense to know the definition of a recreational sport. In simple terms, a recreational sport is any sport activity or event that one engages in during leisure time. In other words, it is a sport activity or event performed primarily for entertainment and fun. Though in some cases there may be monetary rewards associated with passtime sport, it is not usually the main goal. Other reasons associated with participating in a leisure activities includes: fitness, health, socialization, competition and sport support among others.

There are several options of leisure activities available for all age categories ranging from indoor to outdoor. Making the decision on which choice to pursue can be a real challenge and this varies significantly from one person to the other. For former professional athletes, the decision may be easier especially if they continue participating in their particular former professional sports (i.e. recreational level). The big task of choosing the right recreational sport is however on beginners. In order to make the right choice(s) if you are a beginner, it is important to consider the following general guidelines:

1. Choose a sport that you understand and are passionate about: Leisure sport in a way becomes part of your lifestyle and therefore needs to be entertaining and enjoyable. Choosing something that you don?t like or have no knowledge about can be frustrating even if your friends adore it. It only makes sense to pursue something that you know its rules and regulations. However, this does not mean one cannot learn a new sport or game, but it easier to do so if you love the sport.

2. Consider your goals and objectives: As mentioned above, there are different reasons that drive people into recreational sports. Choosing a sport that is in line with your goals, for example losing weight will only enrich the whole recreational experience. Some one looking for a recreational sport to aid in cutting down some extra body weight may benefit from running, jogging, walking, hiking or swimming among other high calorie burning sport activities as opposed to playing cards or video games. On the other hand somebody looking for a recreational sport that favors socialization may benefit from the latter.

3. Facilities, tools and equipment required: Different recreational sports may require different tools, facilities or equipment or in some cases may require none at all. These tools, facilities or equipment may also vary depending on the needs of every person. For example if you want to play golf for recreation, you will definitely have to purchase a golf club, balls and perhaps shoes. You will also need an available and accessible golf course to play. In some cases if you have more than one favorite recreational sport, you may have to choose what is more convenient based on availability of facilities. It makes more sense to go running at a nearby track especially if you get off work late in the evenings than having to drive for several miles to get to a golf course (i.e. if you like both golf and running).

4. Availability of time: Since a recreational sport is a pastime sport, choosing the right one may be dictated by how much free time is at one?s disposal. Some leisure sports are more time consuming than others. Additionally some of these sports must only be played outside. Where as some sports such as running, jogging, walking, playing tennis, playing basketball or swimming offers both indoor and outdoor options, some of them, for example playing golf, hiking, kayaking, surfing among other don?t. The more time one has, the more the options to choose from and the vice versa.

5. Seasonality: Though this may not be a big deal to people living along the equatorial line geographically, it definitely affects people living in areas with winter and summer climatic seasons. Some recreational sports such as those requiring snow may only be available during winter and only in some parts of the world. So if skiing is the only favorite recreational sport that one can participate in, it means there will be nothing to do for most of the year i.e. during the other seasons. When deciding on the right sport for recreation, it is advisable to have more than one option especially in a situation where one is affected by seasonal changes.

6. Number of participants required: Where as most sports require participation of more than one person at one time, some can be pursued individually. If your schedule does not allow group or team participation, choosing a recreational sport that will enable you to participate alone is a good idea. Jogging, walking, swimming, biking and running are great examples.

As mentioned earlier, this is not an exhaustive list of guidelines, but it is only meant to give you an idea of how to pick the best sport that will make your recreational life a success. Remember the bottom line is fun and entertainment.

Recreational Sport - Steps to Follow When Choosing Your Leisure Sport

Author: Philip Rotich

The author has masters in sports and leisure management. He is a former professional track and field athlete. He is currently pursuing Ph. D program as well coaching and counseling athletes and recreational sports individuals of all ages. For information visit Lose Abdominal Fat

Contents About : Recreational Sport ? Steps to Follow When Choosing Your Leisure Sport

hopfeed_template='';

hopfeed_align='LEFT';

hopfeed_type='IFRAME';

hopfeed_affiliate_tid='tw';

hopfeed_affiliate='ehelps';

hopfeed_fill_slots='true';

hopfeed_height='280';

hopfeed_width='336';

hopfeed_cellpadding='5';

hopfeed_rows='4';

hopfeed_cols='1';

hopfeed_font='Verdana, Arial, Helvetica, Sans Serif';

hopfeed_font_size='10pt';

hopfeed_font_color='000000';

hopfeed_border_color='FFFFFF';

hopfeed_link_font_color='F50039';

hopfeed_link_font_hover_color='3300FF';

hopfeed_background_color='FAFAEB';

hopfeed_keywords='Recreation , Sports ';

hopfeed_path='http://ehelps.hopfeed.com';

hopfeed_link_target='_blank';

-- Download Recreational Sport - Steps to Follow When Choosing Your Leisure Sport as PDF --

Source: http://www.econtentz.com/contents/recreation-and-sports/recreational-sport-steps-to-follow-when-choosing-your-leisure-sport/

xi jinping matt bomer westminster kennel club dog show jeremy lin game winner chocolate covered strawberries shrimp scampi kate upton si cover

Source: http://aivotac.posterous.com/recreational-sport-steps-to-follow-when-choos

beyonce and jay z baby droid 4 tom brady sister dad shoots daughters laptop brandon jennings the vow review luol deng

Source: http://patriciotristanti.posterous.com/recreational-sport-steps-to-follow-when-choos

target walmart best buy banana republic sears gap cyber monday

Source: http://terryjefferson67.typepad.com/blog/2012/11/recreational-sport-steps-to-follow-when-choosing-your-leisure.html

katy perry part of me video photoshop cs6 beta cate blanchett nfl news tebow tebow jets romney etch a sketch

Source: http://horacecampbell717.typepad.com/blog/2012/11/recreational-sport-steps-to-follow-when-choosing-your-leisure.html

sledge hammer tax day freebies madison bumgarner wnba draft tax day april 17 boston marathon

Source: http://simurgior.posterous.com/recreational-sport-steps-to-follow-when-choos

kenny chesney blake shelton academy of country music awards brad paisley zac brown band aubrey born to run

Source: http://delmer72.typepad.com/blog/2012/11/recreational-sport-steps-to-follow-when-choosing-your-leisure.html

seahawks gawker Felix Baumgartner Little Nemo earthquake today earthquake today Romney

#5: Driving Test Success Hazard Perception Test (PC) | Education ...


Find Out Various Best Sellers in Software... Business and Office Software, Children's Fun and Learning Software, Digital Imaging Software, Education and Reference Software, Hobbies and Pastimes Software, Home Computing Software, Languages Software, Operating Systems Software, Programming and Web Development Software,Security and Antivirus Software, Student Licences Software, System Builder (OEM) Software, Video and Music Software

Source: http://educationsoftwarezone.blogspot.com/2012/11/5-driving-test-success-hazard.html

pacers undrafted free agents braveheart earthquake california earthquake california roy orbison the third man

বৃহস্পতিবার, ২৯ নভেম্বর, ২০১২

There has been an error of some kind. Ack!

Sorry, Readability was unable to parse this page for content.

Source: http://feeds.feedburner.com/googlemoneyscam

strait of hormuz new years eve party ideas mars needs moms stephen curry hes just not that into you hes just not that into you texas longhorns

Adopt Oreo! Petite female cat with lots o' whiskers | Cambridge ...

Oreo is a happy, chatty kitty with tons of whiskers. She should be very easy to care for, as she is a short hair tuxedo. She is active and affectionate and will do well in a home that wants to engage her mentally. I think she'll be good at learning tricks. She is very petite for an adult cat - so she'll fit right in to your apartment or smaller space. Oreo is healthy, spayed, and microchipped with a HomeAgain microchip.

Interested in adopting Oreo (or any of our animals)? Due to spam, we only respond to people who fill out applications completely, with all the requested phone numbers. Thank you for understanding. Online adoption application: http://www.brokentailrescue.org/adoption-application/.

Source: http://boston.ebayclassifieds.com/cats-kittens/cambridge/adopt-oreo-petite-female-cat-with-lots-o-whiskers/?ad=24725874

the replacements how to hard boil eggs new nfl uniforms easter derbyshire the matrix oceans 11

Syrian war clouds Turkish plan to clear land mines

AKINCI, Turkey (AP) ? For two people walking into a Turkish minefield, they looked awfully assured.

The pair strode in from Syria on a recent afternoon, following a faint track across the grassy plain. They slipped into Turkey through a fence near a vacant military watchtower and vanished into an olive grove.

Such hazardous crossings are a smuggler's tradition at the border, where Turkish plans to clear a vast belt of land mines have been clouded by Syria's civil war. Last week, Turkey asked NATO allies to deploy Patriot missiles as a defense against any aerial attacks from Syria after shells and bullets spilled across the border, killing and injuring some Turks.

Starting in the 1950s, Turkish forces planted more than 600,000 U.S.-made "toe poppers" ? mines designed to maim, not kill ? and other land mines along much of its 900-kilometer (560-mile) border with Syria, which runs from the Mediterranean Sea to Iraq. The aim was to stop smugglers whose cheap black market goods undercut the Turkish economy and later to thwart Kurdish rebels from infiltrating Turkey's southeast.

However, the mines also killed and maimed civilians, took arable land from Turkish farmers and are now considered by many as a crude method of policing.

Turkey says it plans to clear anti-personnel mines on the Syria border by 2016, missing a March 2014 deadline required by the international Mine Ban Treaty. The International Campaign to Ban Landmines, a Geneva-based group that won the 1997 Nobel Peace Prize, has criticized Turkey for its slow progress.

The European Union has committed ?40 million ($52 million) to demining and surveillance equipment near Turkey's borders with Iran and Armenia on the basis that Turkey could eventually become the EU's most eastern border. Turkey, adjacent to the Middle East and Central Asia, has long been a drug trafficking route and a transit point for migrants who enter Europe illegally.

Since last year, nearly 200,000 Syrian refugees have crossed into Turkey, mostly through border posts or areas known to be free of mines. A Syrian man and two children were reported killed in August, however, by an explosive in an area of Mardin province that had been mined by the Turkish military. Syrian forces last year were also suspected of laying some mines to stem an embarrassing refugee flight into Turkey.

A Turkish smuggler in the border village of Akinci, south of the city of Gaziantep, said he has charged Syrian refugees up to 25 Turkish lira ($14) each to lead them through Turkish minefields. He has also acted as a lookout, monitoring shifts of Turkish military sentries and telling another smuggler who escorts Syrian clients, usually before dawn.

"I don't know where they are going. I don't care," said the gaunt man, who would not give his name and claimed he was desperate for cash. "I know it's risky for me, but I have to do it."

According to lore, villagers used to enter the Akinci mosque, which lies beside a minefield, for prayers and then sneak out the back into Syria for business.

On foot, mule or motorcycle, smugglers traditionally brought in items from Syria, including tea, gasoline, cigarettes, electronics and livestock, to sell for a profit in Turkey. The Syrian war has disrupted but not extinguished the trade among communities that were abruptly divided when the border was drawn in the last century.

Some smugglers try their luck at border posts, which became easier to cross when visa requirements were removed in 2009 after the warming of ties between Turkey and Syrian President Bashar Assad, now an enemy because of his attacks on the Syrian opposition. A few weeks ago, a Syrian man was detained while trying to enter Turkey with gold bars in his waistband.

Approved traffic moves the other way, as Turkey and other nations that oppose Assad send logistical and humanitarian aid to Syrian rebels and civilians. While Turkey says it is not arming the insurgency, Syrian rebels have told The Associated Press they receive some weapons and ammunition from the Turkish side with only sporadic interference from border patrols. According to rebels, these weapons are bought with funding from rich Syrians or sympathetic Gulf Arabs.

Fences are down and cars can cross in some parts adjoining Syria's Idlib province, an opposition stronghold.

The first mines on the Syrian border were planted after smugglers killed two customs agents in 1956. Turkey laid more mines in the 1980s and 1990s, at the height of its war with the rebel Kurdistan Workers' Party, or PKK, which was backed by Syria. Turkey is again worried about possible infiltration by Kurdish rebels who are cheered by an autonomy grab by their ethnic brethren in Syria.

The Turkish defense ministry told the AP it started evaluating bids from demining companies in July and would sign contracts once the assessment is complete.

"Developments in Syria to this day have not affected our plans or work," the ministry said. NATO said it is assisting with "technical preparations" for the mine clearance.

Cenk Sidar, managing director of Sidar Global Advisors, a Washington-based consultancy, said he believed that Turkey would sign contracts but wait until the Syrian civil war is resolved.

"According to plans, the government will build electronic border surveillance systems simultaneously with the demining. Even this seems too risky at this point," Sidar wrote in an email. "It may take a few years, and some qualified/selected firms may change their pricing or conditions due to the increasing instability."

Between 2010 and 2011, a Turkish firm, Nokta, and a partner from Azerbaijan cleared more than 1,200 mines around an archaeological site, Karkemish, on the Syrian border. They found anti-tank mines and M14 mines known as "toe poppers." It was hard to work with metal detectors because the soil also contained remnants of coins and other ancient fragments; some mines had to be dug out by hand rather than detonated to avoid damaging cultural treasures.

There is no reliable data for casualties from mines laid by the Turkish military, whose fight with the PKK has claimed tens of thousands of lives. The rebels, who regularly target security forces with mines and roadside bombs, took up arms in 1984 in the name of Kurdish rights; Turkey and the West label them terrorists.

Residents around Akinci recalled a villager who lost a limb to a mine several years ago while cutting trees for military sentries. Halil Kaya, 64, said he had heard of several dozen people over the decades who were killed or injured by mines. A deep furrow runs down Kaya's right forearm from a Turkish military bullet in his days as a smuggler.

Mehmet Dagdeviren, 49, said the Turkish military had softened and now might only fire warning shots at smugglers. He interrupted the chat to take a phone call, then rushed to a car and drove away.

A delivery from Syria needed collection.

___

Umut Colak in Akinci, Turkey, Bulut Emiroglu in Istanbul and Ben Hubbard in Beirut contributed.

Source: http://news.yahoo.com/syrian-war-clouds-turkish-plan-clear-land-mines-085245388.html

Coughing eddie murphy Stephanie Bongiovi stanford football guy fieri Jill Kelley hope solo

New study shows how climate change could affect entire forest ecosystems

New study shows how climate change could affect entire forest ecosystems [ Back to EurekAlert! ] Public release date: 28-Nov-2012
[ | E-mail | Share Share ]

Contact: Gail Gallessich
gail.g@ia.ucsb.edu
805-893-7220
University of California - Santa Barbara

(Santa Barbara, Calif.) The fog comes in, and a drop of water forms on a pine needle, rolls down the needle, and falls to the forest floor. The process is repeated over and over, on each pine needle of every tree in a forest of Bishop pines on Santa Cruz Island, off the coast of Santa Barbara. That fog drip helps the entire forest ecosystem stay alive.

Thousands of years ago, in cooler and wetter times, Bishop pine trees are thought to have proliferated along the West Coast of the U.S. and Mexico. Now, stratus clouds the low-altitude clouds known locally as "June gloom" help keep the trees growing on Santa Cruz Island, Santa Rosa Island, and on one island off Baja California. Other than these locations, Bishop pine trees grow only farther north in California where it is cooler and wetter.

Mariah S. Carbone, first author of a new paper, titled "Cloud Shading and Fog Drip Influence the Metabolism of a Coastal Pine Ecosystem," and her co-authors, studied the influence of clouds on the largest Bishop pine forest of Santa Cruz Island. Carbone is a postdoctoral fellow with UC Santa Barbara's National Center for Ecological Analysis and Synthesis (NCEAS). Their study was published in the journal Global Change Biology.

"When people think about climate change, they're often thinking about temperature and precipitation," said Carbone. "When you think about precipitation, it's rain and snow, depending on where you are. What this study showed is that you can have really important water inputs coming from clouds that influence the carbon cycle."

She explained that clouds are one of the largest uncertainties in global climate, and that the forest ecosystem interactions with clouds have a large impact one that has rarely been studied before, particularly in Southern California.

Changes in cloudiness or cloud height with global warming will alter the types of forest ecosystems that grow in coastal California, explained Carbone. While predictions about how rainfall will change in California over the next 50 years are uncertain, fog and low-stratus clouds might decline as sea-surface temperatures warm. Like the relict Bishop pines on Santa Cruz Island, and the majestic coastal Redwood forests in Northern California, forests remove and store carbon from the atmosphere, and thus are important for understanding greenhouse gas concentrations in the future. These coastal forests are also highly valued for their aesthetic and recreation qualities.

Fog is often present in coastal California during May through August. It occurs when the land warms in the spring and summer, and moist ocean air is pulled over cold, upwelling coastal waters. This moist air then condenses under a stable atmospheric inversion layer, creating low clouds or fog banks.

"The finding that summer fog strongly impacts carbon cycling highlights the need for improved understanding of whether we should expect coastal summer cloud behavior to change in a warmer world," said second author A. Park Williams, a former graduate student in UCSB's Geography Department, now at Los Alamos National Laboratory. "A change in summer fogginess could produce temperature, moisture, and carbon feedbacks in coastal ecosystems that easily swamp out the effects expected from increased greenhouse gases alone," said Williams.

The carbon cycle involves the movement of billions of tons of carbon between the oceans, lands, and atmosphere every year. Increased amounts of carbon dioxide, a potent greenhouse gas, are injected into the atmosphere and contribute to climate change.

The scientists received help from NASA and NOAA in collecting information. "We used satellite data to map the spatial distribution of cloud cover across the western portion of Santa Cruz Island," said senior author Christopher J. Still, formerly an associate professor at UC Santa Barbara, now at Oregon State University. "We had some evidence of a cloud cover gradient from the coast to inland, based on our own observations and our weather station data, but the satellite data from NOAA and NASA satellites really allowed us to quantify this gradient across the western half of the island and in particular at our two study sites," said Still.

Still said that the authors believe this study is unique in linking clouds to soil microbial activity. "While most previous research on fog and ecosystems has focused on its role in plant-water relations such as the well-known linkages between fog and coast Redwoods we show that soil microbial activity and metabolism in these coastal ecosystems may be very dependent on the light but frequent fog drip that occurs during the rainless summer months," said Still. The study is also unique in linking fog and low clouds to the carbon cycle of a coastal ecosystem, including its impact on tree growth and soil respiration.

"What we found was that there are two major effects of the clouds," said Carbone. "One is shading, which keeps the temperatures cooler and the soil moisture higher. The other is fog drip, which is a water input into the soil."

The soil moisture content was not depleted as rapidly where the trees were under more cloud cover, and thus they were able to grow longer into the dry season. Water pulses from fog drip immediately stimulated microbes in the litter and soil below, but did not directly enhance pine tree activity. The microbial activity releases carbon dioxide into the atmosphere.

"This study provides us with a greater understanding of how fog and the low coastal clouds which Californians commonly call 'the marine layer' affect plant growth and the activities of microorganisms in the soil," said John Randall, scientist with The Nature Conservancy, which owns and operates Santa Cruz Island in cooperation with the National Park Service and the University of California. "Their findings of the importance of fog and low clouds in influencing plant growth and survival and microbial metabolism in the soil will help us understand how changes in coastal fogs and low clouds that may accompany climate change will affect the forests and soils on Santa Cruz Island, other islands off the coast of California and Mexico, and all along the coast of the adjacent mainland."

###

The work on Santa Cruz Island, conducted in cooperation with The Nature Conservancy, was funded by grants from the Andrew Mellon Foundation and the Kearney Foundation of Soil Science. The NOAA Climate and Global Change Postdoctoral Fellowship and the National Center for Ecological Analysis and Synthesis have supported Carbone.


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

?


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


New study shows how climate change could affect entire forest ecosystems [ Back to EurekAlert! ] Public release date: 28-Nov-2012
[ | E-mail | Share Share ]

Contact: Gail Gallessich
gail.g@ia.ucsb.edu
805-893-7220
University of California - Santa Barbara

(Santa Barbara, Calif.) The fog comes in, and a drop of water forms on a pine needle, rolls down the needle, and falls to the forest floor. The process is repeated over and over, on each pine needle of every tree in a forest of Bishop pines on Santa Cruz Island, off the coast of Santa Barbara. That fog drip helps the entire forest ecosystem stay alive.

Thousands of years ago, in cooler and wetter times, Bishop pine trees are thought to have proliferated along the West Coast of the U.S. and Mexico. Now, stratus clouds the low-altitude clouds known locally as "June gloom" help keep the trees growing on Santa Cruz Island, Santa Rosa Island, and on one island off Baja California. Other than these locations, Bishop pine trees grow only farther north in California where it is cooler and wetter.

Mariah S. Carbone, first author of a new paper, titled "Cloud Shading and Fog Drip Influence the Metabolism of a Coastal Pine Ecosystem," and her co-authors, studied the influence of clouds on the largest Bishop pine forest of Santa Cruz Island. Carbone is a postdoctoral fellow with UC Santa Barbara's National Center for Ecological Analysis and Synthesis (NCEAS). Their study was published in the journal Global Change Biology.

"When people think about climate change, they're often thinking about temperature and precipitation," said Carbone. "When you think about precipitation, it's rain and snow, depending on where you are. What this study showed is that you can have really important water inputs coming from clouds that influence the carbon cycle."

She explained that clouds are one of the largest uncertainties in global climate, and that the forest ecosystem interactions with clouds have a large impact one that has rarely been studied before, particularly in Southern California.

Changes in cloudiness or cloud height with global warming will alter the types of forest ecosystems that grow in coastal California, explained Carbone. While predictions about how rainfall will change in California over the next 50 years are uncertain, fog and low-stratus clouds might decline as sea-surface temperatures warm. Like the relict Bishop pines on Santa Cruz Island, and the majestic coastal Redwood forests in Northern California, forests remove and store carbon from the atmosphere, and thus are important for understanding greenhouse gas concentrations in the future. These coastal forests are also highly valued for their aesthetic and recreation qualities.

Fog is often present in coastal California during May through August. It occurs when the land warms in the spring and summer, and moist ocean air is pulled over cold, upwelling coastal waters. This moist air then condenses under a stable atmospheric inversion layer, creating low clouds or fog banks.

"The finding that summer fog strongly impacts carbon cycling highlights the need for improved understanding of whether we should expect coastal summer cloud behavior to change in a warmer world," said second author A. Park Williams, a former graduate student in UCSB's Geography Department, now at Los Alamos National Laboratory. "A change in summer fogginess could produce temperature, moisture, and carbon feedbacks in coastal ecosystems that easily swamp out the effects expected from increased greenhouse gases alone," said Williams.

The carbon cycle involves the movement of billions of tons of carbon between the oceans, lands, and atmosphere every year. Increased amounts of carbon dioxide, a potent greenhouse gas, are injected into the atmosphere and contribute to climate change.

The scientists received help from NASA and NOAA in collecting information. "We used satellite data to map the spatial distribution of cloud cover across the western portion of Santa Cruz Island," said senior author Christopher J. Still, formerly an associate professor at UC Santa Barbara, now at Oregon State University. "We had some evidence of a cloud cover gradient from the coast to inland, based on our own observations and our weather station data, but the satellite data from NOAA and NASA satellites really allowed us to quantify this gradient across the western half of the island and in particular at our two study sites," said Still.

Still said that the authors believe this study is unique in linking clouds to soil microbial activity. "While most previous research on fog and ecosystems has focused on its role in plant-water relations such as the well-known linkages between fog and coast Redwoods we show that soil microbial activity and metabolism in these coastal ecosystems may be very dependent on the light but frequent fog drip that occurs during the rainless summer months," said Still. The study is also unique in linking fog and low clouds to the carbon cycle of a coastal ecosystem, including its impact on tree growth and soil respiration.

"What we found was that there are two major effects of the clouds," said Carbone. "One is shading, which keeps the temperatures cooler and the soil moisture higher. The other is fog drip, which is a water input into the soil."

The soil moisture content was not depleted as rapidly where the trees were under more cloud cover, and thus they were able to grow longer into the dry season. Water pulses from fog drip immediately stimulated microbes in the litter and soil below, but did not directly enhance pine tree activity. The microbial activity releases carbon dioxide into the atmosphere.

"This study provides us with a greater understanding of how fog and the low coastal clouds which Californians commonly call 'the marine layer' affect plant growth and the activities of microorganisms in the soil," said John Randall, scientist with The Nature Conservancy, which owns and operates Santa Cruz Island in cooperation with the National Park Service and the University of California. "Their findings of the importance of fog and low clouds in influencing plant growth and survival and microbial metabolism in the soil will help us understand how changes in coastal fogs and low clouds that may accompany climate change will affect the forests and soils on Santa Cruz Island, other islands off the coast of California and Mexico, and all along the coast of the adjacent mainland."

###

The work on Santa Cruz Island, conducted in cooperation with The Nature Conservancy, was funded by grants from the Andrew Mellon Foundation and the Kearney Foundation of Soil Science. The NOAA Climate and Global Change Postdoctoral Fellowship and the National Center for Ecological Analysis and Synthesis have supported Carbone.


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

?


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Source: http://www.eurekalert.org/pub_releases/2012-11/uoc--nss112812.php

juan pablo montoya crash chardon high school shooting mark martin cleveland news daytona race the cutting edge fox 8 news