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The changes in ENSO...
The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations
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- Han, Zixuan (författare)
- Stockholm University,Stockholms universitet,Institutionen för naturgeografi,Lanzhou University, China
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- Zhang, Qiong (författare)
- Stockholm University,Stockholms universitet,Institutionen för naturgeografi
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- Wen, Qin (författare)
- Stockholm University,Stockholms universitet,Meteorologiska institutionen (MISU),Peking University, China
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- Lu, Zhengyao (författare)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,MERGE: ModElling the Regional and Global Earth system,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Feng, Guolin (författare)
- National Climate Center Beijing,Lanzhou University,Yangzhou University
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- Su, Tao (författare)
- Yangzhou University
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- Li, Qiang (författare)
- Stockholms universitet,Institutionen för naturgeografi
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Zhang, Qiang (författare)
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(creator_code:org_t)
- 2020-05-21
- 2020
- Engelska.
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Ingår i: Climate Dynamics. - : Springer Science and Business Media LLC. - 0930-7575 .- 1432-0894. ; 55, s. 503-519
- Relaterad länk:
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https://doi.org/10.1...
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https://link.springe...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- The El Nino-Southern Oscillation (ENSO) is one of the most significant climate variability signals. Studying the changes in ENSO-induced precipitation variability (ENSO precipitation) in the past climate offers a possibility to a better understanding of how they may change under future climate conditions. This study uses simulations performed with the European community Earth-System Model (EC-Earth) to investigate the relative contributions of dynamic effect (the circulation anomalies together with the climatological specific humidity) and thermodynamic effect (the specific humidity anomalies together with the climatological circulation) on the changes in ENSO precipitation in the past warm and cold climates, represented by the Pliocene and the Last Glacial Maximum (LGM), respectively. The results show that the changes in ENSO precipitation are intensified (weakened) over the tropical western Pacific but weakened (intensified) over the tropical central Pacific in Pliocene (LGM) compared with the pre-industrial (PI) simulation. Based on the decomposed moisture budget equation, these changes in ENSO precipitation patterns are highly related to the dynamic effect. The mechanism can be understood as follows: the zonal gradient of the mean sea surface temperature (SST) over the tropical Indo-Pacific is increased (reduced) during the Pliocene (LGM), leading to the strengthening (weakening) of Pacific Walker Circulation as well as a westward (eastward) shift. In the Pliocene, the westward shift of Walker Circulation results in an increased (decreased) ENSO-induced low-level vertical velocity variability in the tropical western Pacific (central Pacific), and, in turn, favoring convergent (divergent) moisture transport through a dynamic process, and then causing intensified (weakened) ENSO precipitation there. The opposite mechanism exists in LGM. These results suggest that changes in the zonal SST gradient over tropical Indo-Pacific under different climate conditions determine the changes in ENSO precipitation through a dynamic process.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)
Nyckelord
- El Nino-Southern Oscillation
- Precipitation variability
- The Pliocene
- The Last Glacial Maximum
- Dynamic and thermodynamic contribution
- Zonal SST gradient
- Walker circulation
- Dynamic and thermodynamic contribution
- El Niño-Southern Oscillation
- Precipitation variability
- The Last Glacial Maximum
- The Pliocene
- Walker circulation
- Zonal SST gradient
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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