Navigation Links
Climate tug of war disrupting Australian atmospheric circulation patterns
Date:6/26/2013

Further evidence of climate change shifting atmospheric circulation in the southern Australian-New Zealand region has been identified in a new study.

The study, in the Nature journal Scientific Reports, demonstrates that mid-latitude high pressure zones (30oS-45oS) are being pushed further into the Southern Ocean by rising global temperatures associated with greenhouse warming. This is despite more frequent occurrences of strong El Nios in recent decades, which should have drawn the high pressure zones in the opposite direction toward the equator.

"What we are seeing," says study lead author, Mr Guojian Wang "is a 'tug of war' between stronger El Nios driving the winds north and the greenhouse gas-warming effect driving the winds south".

Mr Wang, said the result confirms the robustness of the Southern Hemisphere circulation changes over the past three to four decades as the global temperature rose, "so much so that it overode the influence from strong El Nios during this period."

Study co-author, Dr Wenju Cai said the most conspicuous change is a rising sea level pressure in the mid-latitude bands and a decreasing sea level pressure over the Southern high latitudes (55o-70oS), a pattern referred to as the Southern Annular Mode. The changing pressures indicate a poleward or southward expansion of the tropical and subtropical atmospheric zones.

In turn, this indicates that over the long-term, there is a relationship between a rising global mean temperature and an upward trend of the Southern Annular Mode.

"The research reinforces our past work that climate change is altering Southern Hemisphere circulation and increases our confidence in this conclusion," Dr Cai said.

Dr Cai has previously reported on changes in atmospheric circulation that have been shifting and strengthening the Pacific Ocean winds poleward and in turn strengthening the ocean circulation, pushing the East Australian Current further south down the Australian coast.

He said during El Nio, the warmer ocean releases heat to the atmosphere and global average temperatures increase. At the same time, warm ocean surface temperatures along the equator cause the tropical and subtropical atmospheric belts to move toward the equator, generating a 'negative' phase of the Southern Annular Mode.

"On year-to-year time scales, higher global temperatures are associated with a negative phase of the Mode but over the past 35 years, when El Nio has been strong and conducive to a negative trend, we are seeing an opposite trend with the circulation systems moving southward impacting on regional climate," he said.


'/>"/>

Contact: Craig Macaulay
Craig.Macaulay@csiro.au
61-362-325-219
CSIRO Australia
Source:Eurekalert

Related biology news :

1. Surprise species at risk from climate change
2. DoD-funded research: Can climate change heat up conflict?
3. Alpine lakes reflect climate change
4. Hidden effects of climate change may threaten eelgrass meadows
5. UCLA life scientists present new insights on climate change and species interactions
6. Front-row seats to climate change
7. Climate change may have little impact on tropical lizards
8. Canada must addess real climate-change challenge
9. Maps developed to help forest industry outwit climate change
10. Climate change will cause widespread global-scale loss of common plants and animals
11. Organic vapors affect clouds leading to previously unidentified climate cooling
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access System ... over the next decade to reach approximately $1,580 million by 2025. ... forecasts for all the given segments on global as well as ...
(Date:3/22/2017)... March 21, 2017   Neurotechnology , a ... technologies, today announced the release of the ... provides improved facial recognition using up to 10 ... single computer. The new version uses deep neural-network-based ... and it utilizes a Graphing Processing Unit (GPU) ...
(Date:3/20/2017)... At this year,s CeBIT Chancellor Dr. Angela Merkel ... came to the DERMALOG stand together with the Japanese Prime Minster Shinzo ... At the largest German biometrics company the two government leaders could see ... as well as DERMALOGĀ“s multi-biometrics system.   Continue ... ...
Breaking Biology News(10 mins):
(Date:7/26/2017)... CA (PRWEB) , ... July 25, 2017 , ... ... , is proud to announce that its regenerative stem cell therapy has been ... to discover a successful treatment for horses with potentially fatal injuries to tendons ...
(Date:7/26/2017)... ... 26, 2017 , ... NLP Logix today announced a collaboration ... by Mayo Clinic and the experience in developing and deploying artificial intelligence solutions ... Microsoft Azure platform and will focus on assisting physicians to more accurately and ...
(Date:7/25/2017)... Falls, Wisconsin (PRWEB) , ... July 25, 2017 , ... ... for the food and beverage industry, offers Citri-Fi® 125. This natural citrus fiber is ... to thicken and extend real tomato in sauces, condiments and spreads. Today, more than ...
(Date:7/24/2017)... 2017 Intralytix, Inc. announced that it received ... French family group. This investment marks the beginning of ... commercialize bacteriophage-based products, for various benefits in human health ... As a global key ... markets innovative solutions for baking, food taste & pleasure, ...
Breaking Biology Technology: