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:2/3/2016)... -- Vigilant Solutions announces today that the ... solved two recent hit-and-run cases with the ... Solutions. Brian Wenberg explains, "I was ... out of a convenience store and witnessed an elderly male back out ... his vehicle and leaving the scene.  In his statement ...
(Date:2/2/2016)... , Feb. 2, 2016 Checkpoint ... that Rising Market Are you interested in ... forecasts revenues for checkpoint inhibitors. Visiongain,s report gives ... submarket, product and national level. Avoid falling ... what progress, opportunities and revenues those emerging cancer ...
(Date:2/1/2016)... 2016 Rising sales of consumer ... touchfree intuitive gesture control market size ... of consumer electronics coupled with new technological advancements to ... size through 2020   --> ... technological advancements to drive global touchfree intuitive gesture control ...
Breaking Biology News(10 mins):
(Date:2/8/2016)... ... February 08, 2016 , ... Franz Inc. ... Graph Database technology, today announced the availability of AllegroGraph 6, the leading Semantic ... Cloudera Certified Technology Program (CCPT). AllegroGraph is the first Semantic Graph ...
(Date:2/8/2016)... , Feb. 8, 2016  Diplomat Pharmacy, Inc. (NYSE: DPLO) announced today that its new ... specialty pharmacy resource–user-centric, story-driven, knowledge-based and mobile-friendly. Visit ... ... ... "The goal was ...
(Date:2/6/2016)... ... February 06, 2016 , ... ... , The Center for Excellence in Education Sponsors Teacher Training Program , Bite ... 4, 2016 – The Center for Excellence in Education (CEE) will sponsor a ...
(Date:2/5/2016)... Feb. 5, 2016 On Thursday, February 11, ... source for community, health and disaster services, and the ... integrate to enhance care coordination and service delivery for ... they need and to better connect service providers to ... San Diego has handled more ...
Breaking Biology Technology: