[ | E-mail |
Contact: David Hosansky
hosansky@ucar.edu
303-497-8611
National Center for Atmospheric Research/University Corporation for Atmospheric Research
BOULDER Even if you live more than 1,000 miles from the nearest large city, it could be affecting your weather.
In a new study that shows the extent to which human activities are influencing the atmosphere, scientists have concluded that the heat generated by everyday activities in metropolitan areas alters the character of the jet stream and other major atmospheric systems. This affects temperatures across thousands of miles, significantly warming some areas and cooling others, according to the study in Nature Climate Change.
The extra "waste heat" generated from buildings, cars, and other sources in major Northern Hemisphere urban areas causes winter warming across large areas of northern North American and northern Asia. Temperatures in some remote areas increase by as much as 1 degree Celsius (1.8 degrees Fahrenheit), according to the research by scientists at the Scripps Institution of Oceanography, University of California, San Diego; Florida State University; and the National Center for Atmospheric Research.
At the same time, the changes to atmospheric circulation caused by the waste heat cool areas of Europe by as much as 1 degree C (1.8 degrees F), with much of the temperature decrease occurring in the fall.
The net effect on global mean temperatures is nearly negligiblean average increase worldwide of just 0.01 degrees C (about 0.02 degrees F). This is because the total human-produced waste heat is only about 0.3 percent of the heat transported across higher latitudes by atmospheric and oceanic circulations.
However, the noticeable impact on regional temperatures may explain why some regions are experiencing more winter warming than projected by climate computer models, the researchers conclude. They suggest that models be adjusted to take the influence of waste heat into account.
"The burning of fossil fuel not only emits greenhouse gases but also directly affects temperatures because of heat that escapes from sources like buildings and cars," says NCAR scientist Aixue Hu, a co-author of the study. "Although much of this waste heat is concentrated in large cities, it can change atmospheric patterns in a way that raises or lowers temperatures across considerable distances."
The researchers stressed that the effect of waste heat is distinct from the so-called urban heat island effect. Such islands are mainly a function of the heat collected and re-radiated by pavement, buildings, and other urban features, whereas the new study examines the heat produced directly through transportation, heating and cooling units, and other activities.
The study, "Energy consumption and the unexplained winter warming over northern Asia and North America" appears this Sunday. It was funded by the National Science Foundation, NCAR's sponsor, as well as the Department of Energy and the National Oceanic and Atmospheric Administration.
Hu, along with lead author Guang Zhang of Scripps and Ming Cai of Florida State University, analyzed the energy consumption from heating buildings to powering vehicles that generates waste heat release. The world's total energy consumption in 2006 was equivalent to a constant-use rate of 16 terawatts (one terawatt, or TW, equals 1 trillion watts). Of that, an average rate of 6.7 TW was consumed in 86 metropolitan areas in the Northern Hemisphere.
Using a computer model of the atmosphere, the authors found that the influence of this waste heat can widen the jet stream.
"What we found is that energy use from multiple urban areas collectively can warm the atmosphere remotely, thousands of miles away from the energy consumption regions," Zhang says. "This is accomplished through atmospheric circulation change."
The release of waste heat is different from energy that is naturally distributed in the atmosphere, the researchers noted. The largest source of heat, solar energy, warms Earth's surface and atmospheric circulations redistribute that energy from one region to another. Human energy consumption distributes energy that had lain dormant and sequestered for millions of years, mostly in the form of oil or coal.
Though the amount of human-generated energy is a small portion of that transported by nature, it is highly concentrated in urban areas. In the Northern Hemisphere, many of those urban areas lie directly under major atmospheric troughs and jet streams.
"The world's most populated and energy-intensive metropolitan areas are along the east and west coasts of the North American and Eurasian continents, underneath the most prominent atmospheric circulation troughs and ridges," Cai says. "The release of this concentrated waste energy causes the noticeable interruption to the normal atmospheric circulation systems above, leading to remote surface temperature changes far away from the regions where waste heat is generated."
###
The University Corporation for Atmospheric Research manages the National Center for Atmospheric Research under sponsorship by the National Science Foundation. Any opinions, findings and conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
About the article:
Title: Energy consumption and the unexplained winter warming over northern Asia and North America
Authors: Ghang J. Zhang, Ming Cai, and Aixue Hu
Publication: Nature Climate Change, Jan. 27, 2013
On the Web:
For news releases, images, and more - www.ucar.edu/atmosnews
Additional contacts:
Zhenya Gallon, NCAR/UCAR Media Relations
303-497-8607
zhenya@ucar.edu
Aixue Hu, NCAR Scientist
ahu@ucar.edu
303-497-1334
Guang Zhang, Scripps Research Meteorologist
gzhang@mail.ucsd.edu
858-534-7535
Ming Cai, FSU Professor, Department of Earth, Ocean, and Atmospheric Science
mcai@fsu.edu
850-645-1551
?
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.
[ | E-mail |
Contact: David Hosansky
hosansky@ucar.edu
303-497-8611
National Center for Atmospheric Research/University Corporation for Atmospheric Research
BOULDER Even if you live more than 1,000 miles from the nearest large city, it could be affecting your weather.
In a new study that shows the extent to which human activities are influencing the atmosphere, scientists have concluded that the heat generated by everyday activities in metropolitan areas alters the character of the jet stream and other major atmospheric systems. This affects temperatures across thousands of miles, significantly warming some areas and cooling others, according to the study in Nature Climate Change.
The extra "waste heat" generated from buildings, cars, and other sources in major Northern Hemisphere urban areas causes winter warming across large areas of northern North American and northern Asia. Temperatures in some remote areas increase by as much as 1 degree Celsius (1.8 degrees Fahrenheit), according to the research by scientists at the Scripps Institution of Oceanography, University of California, San Diego; Florida State University; and the National Center for Atmospheric Research.
At the same time, the changes to atmospheric circulation caused by the waste heat cool areas of Europe by as much as 1 degree C (1.8 degrees F), with much of the temperature decrease occurring in the fall.
The net effect on global mean temperatures is nearly negligiblean average increase worldwide of just 0.01 degrees C (about 0.02 degrees F). This is because the total human-produced waste heat is only about 0.3 percent of the heat transported across higher latitudes by atmospheric and oceanic circulations.
However, the noticeable impact on regional temperatures may explain why some regions are experiencing more winter warming than projected by climate computer models, the researchers conclude. They suggest that models be adjusted to take the influence of waste heat into account.
"The burning of fossil fuel not only emits greenhouse gases but also directly affects temperatures because of heat that escapes from sources like buildings and cars," says NCAR scientist Aixue Hu, a co-author of the study. "Although much of this waste heat is concentrated in large cities, it can change atmospheric patterns in a way that raises or lowers temperatures across considerable distances."
The researchers stressed that the effect of waste heat is distinct from the so-called urban heat island effect. Such islands are mainly a function of the heat collected and re-radiated by pavement, buildings, and other urban features, whereas the new study examines the heat produced directly through transportation, heating and cooling units, and other activities.
The study, "Energy consumption and the unexplained winter warming over northern Asia and North America" appears this Sunday. It was funded by the National Science Foundation, NCAR's sponsor, as well as the Department of Energy and the National Oceanic and Atmospheric Administration.
Hu, along with lead author Guang Zhang of Scripps and Ming Cai of Florida State University, analyzed the energy consumption from heating buildings to powering vehicles that generates waste heat release. The world's total energy consumption in 2006 was equivalent to a constant-use rate of 16 terawatts (one terawatt, or TW, equals 1 trillion watts). Of that, an average rate of 6.7 TW was consumed in 86 metropolitan areas in the Northern Hemisphere.
Using a computer model of the atmosphere, the authors found that the influence of this waste heat can widen the jet stream.
"What we found is that energy use from multiple urban areas collectively can warm the atmosphere remotely, thousands of miles away from the energy consumption regions," Zhang says. "This is accomplished through atmospheric circulation change."
The release of waste heat is different from energy that is naturally distributed in the atmosphere, the researchers noted. The largest source of heat, solar energy, warms Earth's surface and atmospheric circulations redistribute that energy from one region to another. Human energy consumption distributes energy that had lain dormant and sequestered for millions of years, mostly in the form of oil or coal.
Though the amount of human-generated energy is a small portion of that transported by nature, it is highly concentrated in urban areas. In the Northern Hemisphere, many of those urban areas lie directly under major atmospheric troughs and jet streams.
"The world's most populated and energy-intensive metropolitan areas are along the east and west coasts of the North American and Eurasian continents, underneath the most prominent atmospheric circulation troughs and ridges," Cai says. "The release of this concentrated waste energy causes the noticeable interruption to the normal atmospheric circulation systems above, leading to remote surface temperature changes far away from the regions where waste heat is generated."
###
The University Corporation for Atmospheric Research manages the National Center for Atmospheric Research under sponsorship by the National Science Foundation. Any opinions, findings and conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
About the article:
Title: Energy consumption and the unexplained winter warming over northern Asia and North America
Authors: Ghang J. Zhang, Ming Cai, and Aixue Hu
Publication: Nature Climate Change, Jan. 27, 2013
On the Web:
For news releases, images, and more - www.ucar.edu/atmosnews
Additional contacts:
Zhenya Gallon, NCAR/UCAR Media Relations
303-497-8607
zhenya@ucar.edu
Aixue Hu, NCAR Scientist
ahu@ucar.edu
303-497-1334
Guang Zhang, Scripps Research Meteorologist
gzhang@mail.ucsd.edu
858-534-7535
Ming Cai, FSU Professor, Department of Earth, Ocean, and Atmospheric Science
mcai@fsu.edu
850-645-1551
?
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/2013-01/ncfa-cat012413.php
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?where the open house Realtors tried to steal both of our clients despite telling them that they were already working with us. Fortunately, both sets of clients are fabulous and remained loyal to us.
23. Jan, 2013



?He?s starting to cop a feel now!? squealed Chris Harrison midway through Sean and Lesley?s lip-lock, extending his own record for being the sleazy best friend who never gets any tail on his own and always gets voted to go on the beer run. ?Chris should never go off script.

Oh look! Chris Harrison got off early from his day job as Baskin Robbins store manager to let the girls know they were going to play volleyball, with the winning team staying with Sean for the rest of the date, and the losers shipped back to the Crab Shack.
Taryn the Health Club Manager from Troutdale, Oregon cooed, ?This volleyball game is the most important game of my life!? which doesn?t say much for Taryn, but says even less about the level of recreational activities available in Troutdale, Oregon.
Kristy was so upset about losing, she cried. ?Cheer up Kristy! ?At least you?re not from a place called Troutdale!
The next one-on-one date went to AshLee the Personal Organizer. ?What can you say about a personal organizer that she wouldn?t be able to say for you in fewer words, on a lovely pink index card, folded just so, and tucked away in a nice box next to your paper clip caddy and your thumb tacks categorized by sharpness?
I don?t like people with made-up professions any more than I like people who capitalize a letter in the middle of their first name. ?But what I really don?t like is when The Bachelor tries to pretend its heart is in the right place. ?For their date, Sean and AshLee had an entire amusement park to themselves? well themselves and two girls who suffer from mitochondrial disease. ?Holy crap! ?How am I supposed to say something snarky about mitochondrial disease? ?It?s one of those diseases that?s so rare I don?t even know if I?m spelling it properly.
Later in the evening, AshLee was proud of herself for sharing with Sean that she was adopted, which, compared to having mitochondrial disease, is like expecting to score points for admitting you have to use Latisse to keep your lashes thick.
Time for the Rose Ceremony! ?But before we start, Sean puled Kacie B. out of the room and told her he had way too much respect for her to embarrass her by making her go through a Rose Ceremony when he knew he didn?t want to be with her. ?So instead he pulled her outside so he?d be able to embarrass her in close-up.
Among those hanging on through to next week were Tierra, Desiree, Leslie H., Drunk and Disorderly Daniella, ?Don?t Hate Me Because I?m Black? Robyn (see next week where she suggestively offers him ?chocolate?), and Jackie the Cosmetics Consultant, who I hope is ringing up sales in the mansion ?cuz she sure ain?t ringing up time on tv.
Kicked to the curb this week were Taryn the Health Club Manager from Troutdale, Oregon:? ?I didn?t open up myself. ?Maybe I?m not ready. ?I might not be sweet enough for him. ?That?s disheartening?

