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:2/13/2017)... , Feb. 13, 2017 Former 9/11 ... Senate Judiciary Committee, Janice Kephart of Identity ... President Donald Trump,s "Executive Order: Protecting the ... (Jan. 27, 2017):  "As President Trump,s ,Travel ... Circuit has now essentially banned the travel ban, it ...
(Date:2/9/2017)... The biomass boiler market report by Transparency Market Research ... in terms of revenue (US$ Mn) based on the ... boilers has been segmented on the basis of feedstock ... based on feedstock type, has been segmented into woody ... urban residues, and others. On the basis of product ...
(Date:2/8/2017)... 2017  Aware, Inc. (NASDAQ: AWRE ), a ... results for its quarter and year ended December 31, 2016. ... was $3.9 million compared to $6.9 million in the same ... 2016 was $0.6 million compared to $2.6 million in the ... of 2016 was $0.5 million, or $0.02 per diluted share, ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... -- Capricor Therapeutics, Inc. (NASDAQ: CAPR), a biotechnology company developing biological ... Linda Marbán, Ph.D, president and chief executive officer, is scheduled ... Cowen and Company 37th Annual Health Care Conference Tuesday, ... MA 29th Annual ROTH Conference ... ET) Dana Point, CA ...
(Date:2/22/2017)... LEAWOOD, Kan. , Feb. 22, 2017  Aratana Therapeutics, ... licensing, development and commercialization of innovative biopharmaceutical products for companion ... 14, 2017 at 8:30 a.m. ET to discuss financial results ... 2016. Interested participants and investors may access ... dial-in: ...
(Date:2/22/2017)... 2017 Scientists propose in Nature ... in Gaucher and maybe other lysosomal storage diseases as ... than current therapies. An international research team ... which also included investigators from the University of Lübeck ... Feb. 22. The study was conducted in mouse models ...
(Date:2/22/2017)... (PRWEB) , ... February 22, 2017 , ... LabRoots ... and scientists from around the world, is pleased to announce the launch of a ... engineering and mathematics (STEM) fields. , This merit-based scholarship is open to all high ...
Breaking Biology Technology: