Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Global warming will leave different fingerprints on global subtropical anticyclones

14.08.2017

Subtropical anticyclone is an essential component of the atmospheric circulation in the subtropics, and it is responsible for the formation of subtropical monsoons and deserts. There are two subtropical anticyclones in the subtropical northern hemisphere in boreal summer, and three subtropical anticyclones in the subtropical southern hemisphere in austral summer. These five summertime subtropical anticyclones are all located at the lower troposphere over the subtropical oceans.

To assess the possible responses of the subtropical anticyclones to greenhouse gases (GHG) forcing, Dr. HE Chao from China Meteorological Administration, and Drs. WU Bo, ZOU Liwei and Prof. ZHOU Tianjun from CAS Institute of Atmospheric Physics adopted multiple metrics and obtained robust results.


Projected future change of relative vorticity at 925 hPa. The black and white contours show the climatology for the 20th and 21st centuries. The shading shows the projected change by the ensemble mean of 30 models, and projected sign of change agreed by more than 70% of the models is stippled.

Credit: He et al, 2017

Coupled models under GHG forcing show that the subtropical anticyclones over North Pacific, South Atlantic and South Indian Ocean will become weaker in future under RCP8.5 scenario, whereas the subtropical anticyclones over North Atlantic and South Pacific will become stronger.

"Intensity change of the subtropical anticyclones to GHG forcing is dominated by two factors -- the enhanced tropospheric static stability and the pattern of change in diabatic heating", said Dr. HE. "The tropospheric static stability is enhanced via moist adiabatic adjustment under GHG forcing, and it acts to reduce the intensity of all the subtropical anticyclones. Meanwhile, the pattern of change in the tropospheric diabatic heating acts to weaken the North Pacific subtropical anticyclone but to enhance the subtropical anticyclones over North Atlantic and South Pacific."

"Our findings show evidences that the global warming will have different impacts on the global subtropical anticyclones", said Dr. ZOU Liwei, the co-author of the paper.

"The intensity of North Pacific subtropical anticyclone reduces significantly, since both the enhanced static stability and enhanced diabatic heating act to weaken it. Over South Atlantic and South Indian Ocean, the effect of enhanced static stability dominates, and the subtropical anticyclones over these two basins also become weaker. The effect of reduced diabatic heating overwhelms the effect of enhanced static stability over North Atlantic and South Pacific, and their combined effect enhances these two subtropical anticyclones."

This study is recently published in Journal of Climate.

Media Contact

Zheng Lin
jennylin@mail.iap.ac.cn
86-108-299-5053

 @aasjournal

http://english.iap.cas.cn/ 

Zheng Lin | EurekAlert!

More articles from Earth Sciences:

nachricht In times of climate change: What a lake’s colour can tell about its condition
21.09.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)

nachricht Did marine sponges trigger the ‘Cambrian explosion’ through ‘ecosystem engineering’?
21.09.2017 | Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>