| DOI: | 10.1007/s00382-014-2103-y
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| Scopus记录号: | 2-s2.0-84896440277
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| 论文题名: | Impact of land–sea thermal contrast on interdecadal variation in circulation and blocking |
| 作者: | He Y.; Huang J.; Ji M.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2014
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| 卷: | 43, 期:12 | | 起始页码: | 3267
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| 结束页码: | 3279
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| 语种: | 英语
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| 英文关键词: | Atmospheric circulation
; Blocking
; Cold ocean/warm land pattern
; Land–sea thermal contrast
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| 英文摘要: | The impact of asymmetric thermal forcing associated with land–sea distribution on interdecadal variation in large-scale circulation and blocking was investigated using observations and the coupled model intercomparison project outputs. A land–sea index (LSI) was defined to measure asymmetric zonal thermal forcing; the index changed from a negative to a positive anomaly in the 1980s. In the positive phase of the LSI, the 500 hPa geopotential height decreased in the polar regions and increased in the mid-latitudes. The tropospheric planetary wave activity also became weaker and exerted less easterly forcing on the westerly wind. These circulation changes were favorable for westerly wind acceleration and reduced blocking. In the Atlantic, the duration of blocking decreased by 38 % during the positive LSI phase compared with that during the negative phase; in Europe, the number of blocking persisting for longer than 10 days during the positive LSI phase was only half of the number during the negative phase. The observed surface air temperature anomaly followed a distinctive “cold ocean/warm land” (COWL) pattern, which provided an environment that reduced, or destroyed, the resonance forcing of topography and was unfavorable for the development and persistence of blocking. In turn, the responses of the westerly and blocking could further enhance continental warming, which would strengthen the “cold ocean/warm land” pattern. This positive feedback amplified regional warming in the context of overall global warming. © 2014, The Author(s). |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/54692
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China
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| Recommended Citation: | |
He Y.,Huang J.,Ji M.. Impact of land–sea thermal contrast on interdecadal variation in circulation and blocking[J]. Climate Dynamics,2014-01-01,43(12)
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