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Thermodynamic and d...
Thermodynamic and dynamic effects of increased moisture sources over the Tropical Indian Ocean in recent decades
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- Han, Zixuan (författare)
- Stockholms universitet,Institutionen för naturgeografi,Lanzhou University, China
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Su, Tao (författare)
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- Zhang, Qiong (författare)
- Stockholms universitet,Institutionen för naturgeografi
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Wen, Qin (författare)
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Feng, Guolin (författare)
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(creator_code:org_t)
- 2019-10-15
- 2019
- Engelska.
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Ingår i: Climate Dynamics. - : Springer Science and Business Media LLC. - 0930-7575 .- 1432-0894. ; 53:11, s. 7081-7096
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In the present work, the mechanisms for the changes in moisture sources (evaporation minus precipitation; EmP) during boreal summer (May-September) are explored over the tropical Indian Ocean during 1979-2016. We apply a moisture budget analysis to quantify the thermodynamic and dynamic effects. Our results show that the EmP in the tropical central-eastern and southwestern Indian Oceans experienced significant increasing trends during boreal summer. The increased EmP in the tropical central-eastern Indian Ocean is due to the enhanced dynamic divergence (account for approximately 51%), while a stronger dynamic advection contributes more moisture supply to the southwestern Indian Ocean (account for approximately 34%). We find that during recent decades, the enhanced east-west thermal gradient in the Pacific strengthens the Walker Circulation, which leads to a westward shift in convection over the Indian Ocean warm pool, resulting in weakened convection and ascent over the tropical central-eastern Indian Ocean. The weakened convection leads to an anomalous low-level atmospheric divergent circulation, which intensifies the dynamic divergence contributing to the enhanced EmP over the tropical central-eastern Indian Ocean. Additionally, the warming climate during recent decades also increases the land-sea thermal contrast in the vicinity of the Indian Ocean, which enhances the southeastern wind in the low-level troposphere and leads to an enhanced EmP over the southwestern Indian Ocean.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Moisture source
- Atmospheric moisture budget
- Dynamic and thermodynamic mechanisms
- Walker circulation
- Land-sea thermal contrast
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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