About  |   Contact  |  Mongabay on Facebook  |  Mongabay on Twitter  |  Subscribe
Rainforests | Tropical fish | Environmental news | Blog | For kids | Madagascar | Photos | Non-English languages | Tropical Conservation Science | Jobs
SHARE:




Droughts in India to worsen with climate change -- study
mongabay.com
May 12, 2006


Climate change may be weakening India's monsoon, producing droughts and potentially causing significant consequences in the world's most populous region, according to a new study by scientists at Scripps Institution of Oceanography at the University of California, San Diego.

In a study published in the May 15 issue of the American Meteorological Society's Journal of Climate, Chul Eddy Chung and V. Ramanathan of Scripps Oceanography say that cooler-than-normal temperatures in the northern part of the Indian ocean have weakened the region's natural climate circulation and monsoon conditions, resulting in reduced rainfall over India and increased rainfall over the Sahel area south of the Sahara in Africa.

According to the authors, drier climate conditions result from varying rate at which parts of the Indian Ocean are warming -- tempartures in the tropical Indian Ocean are climbing faster than the northern Indian Ocean.

"It appears that the whole tropical region in this area is being pulled in different directions," said Ramanathan, director of the Center for Clouds, Chemistry and Climate at Scripps. "The observed trend of reduced sunlight reaching the Earth's surface, with compensating solar heating aloft from the pollution, also called the ‘brown haze,' appears to be masking the greenhouse warming in the northern Indian Ocean, while the greenhouse warming continues unabated in the southern Indian Ocean. We are starting to see that the air pollution affects sunlight and is potentially having a major disruption of the rain patterns, with some regions getting more and some less."


The amount of sunlight decreased by pollution, or "brown clouds," is highlighted by watts per square meter of Earth's surface. The gray and green areas have less of the dimming effect than the blue and dark blue regions. For example, the brown clouds over India have decreased sunlight by -12 to -20 watts per square meter. The climatological value of sunlight at the surface is about 200 watts per square meter, which means the sunlight has decreased by about 6 to 10 percent. (Graphic from Chung, Ramanathan, Kim and Podgorny, 2005 Journal of Geophysical Research)
"The greenhouse gases are pushing in one direction, warming the ocean and trying to make more rain, and the aerosols are pushing in another direction for cooler oceans and less rain. The net effect is to drive the monsoon rain system away from South Asia into the equatorial and southern oceans," said Ramanathan. "Some years the aerosols might win and in some years the greenhouse effect may win. So we are concerned that in coming decades the variability between the two will become large and it will be difficult to cope with rapid changes from year to year."

The authors say that similar pollution clouds can be seen in other parts of the world, including the United States.

"About five to 10 years ago we used to think about pollution as an urban problem," said Ramanathan. "Now we have discovered, with new observations including satellite data, that these pollution clouds travel quickly and can cover an entire ocean. Scientists have shown that in a matter of five days pollution traveled from China to the United States, and in a matter of three to four days it can travel from the U.S. to Europe."

Chung and Ramanathan say that monsoonal rainfall over India has decreased by approximately five to eight percent since the 1950s.



This article is based on a news release from Scripps Institution of Oceanography at the University of California, San Diego.












CITATION:
mongabay.com (May 12, 2006). Droughts in India to worsen with climate change -- study. http://news.mongabay.com/2006/0512-sio.html


Tags:
impact of climate change climate science climate change water drought earth science africa asia India green

print


News index | RSS | News Feed | Twitter | Home


Advertisements:


Organic Apparel from Patagonia | Insect-repelling clothing




Mongabay Store
Wildlife of Madagascar T-shirt
Wildlife of Madagascar T-shirt
Bold and Dangerous - Pygmy tyrant t-shirts
Bold and Dangerous - Pygmy tyrant
Love me before I'm gone - Gladiator frog t-shirts
Love me before I'm gone - Gladiator frog
Licking this frog may make you crazy t-shirts
Licking this frog may make you crazy





WEEKLY NEWSLETTER
Email:





SUPPORT
Mongabay.com seeks to raise interest in and appreciation of wild lands and wildlife, while examining the impact of emerging trends in climate, technology, economics, and finance on conservation and development (more)

Help support mongabay.com when you buy from Amazon.com



POPULAR PAGES
Rainforests
Rain forests
Amazon deforestation
Deforestation
Deforestation stats
Why rainforests matter
Saving rainforests
Deforestation stats
Rainforest canopy

News
Most popular articles
Worth saving?
Forest conservation
Earth Day
Poverty alleviation
Cell phones in Africa
Seniors helping Africa
Saving orangutans in Borneo
Palm oil
Amazon palm oil
Future of the Amazon
Cane toads
Dubai environment
Investing to save rainforests
Visiting the rainforest
Biomimicry
Defaunation
Blue lizard
Amazon fires
Extinction debate
Extinction crisis
Blackwashing
Industrial deforestation
Save the Amazon
Rainforests & REDD
Brazil's Amazon plan
Malaysian palm oil
Avatar story
New Guinea
Sulawesi
Amazon ranching
Madagascar
Borneo

News topics
Amazon
Biofuels
Brazil
Carbon Finance
Conservation
Climate Change
Deforestation
Energy
Happy-upbeat
Indonesia
Interviews
Oceans
Palm oil
Rainforests
REDD
Solutions
Wildlife
MORE TOPICS



Non-English Sites
Chinese
French
German
Greek
Indonesian
Italian
Portuguese
Spanish
Other languages

Nature Blog Network









Photos
Alaska photos
Alaska

Argentina photos
Argentina

Australia photos
Australia

Belize photos
Belize

Brazil photos
Brazil

Cambodia photos
Cambodia

China photos
China

Colombia photos
Colombia

Costa Rica photos
Costa Rica

Deforestation photos
Deforestation

Frog photos
Frog

Gabon photos
Gabon

Grand Canyon photos
Grand Canyon

Honduras photos
Honduras

India photos
India

Indonesia photos
Indonesia

Kenya photos
Kenya

Laos photos
Laos

Lemur photos
Lemur

Madagascar photos
Madagascar

Malaysia photos
Malaysia

Monkey photos
Monkey

New Zealand photos
New Zealand

Panama photos
Panama

Peru photos
Peru

Peru photos
Rainforest


Sunset

Suriname photos
Suriname

Tanzania photos
Tanzania

Thailand photos
Thailand

Uganda photos
Uganda

United States photos
United States

Venezuela photos
Venezuela



HIGH RESOLUTION PHOTOS / PRINTS


CALENDARS
  • Mount Kenya
  • East Africa Safari Wildlife
  • Kenya's Turkana People
  • Peru
  • African Wildlife
  • Alaska
  • China
  • Madagascar Chameleons


    CANVAS BAGS

  • Hallucinogenic frog bag
  • Madagascar wildlife bag








  • Copyright mongabay 2010

    Carbon dioxide (CO2) emissions generated from mongabay.com operations (server, data transfer, travel) are mitigated through an association with Anthrotect,
    an organization working with Afro-indigenous and Embera communities to protect forests in Colombia's Darien region.
    Anthrotect is protecting the habitat of mongabay's mascot: the scale-crested pygmy tyrant.