Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0214.1 |
Processes and Timescales in Onset and Withdrawal of "Aquaplanet Monsoons" | |
Geen, Ruth; Lambert, F. Hugo; Vallis, Geoffrey K. | |
2019-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:8页码:2357-2373 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Aquaplanets with low-heat-capacity slab-ocean boundary conditions can exhibit rapid changes in the regime of the overturning circulation over the seasonal cycle, which have been connected to the onset of Earth's monsoons. In spring, as the ITCZ migrates off the equator, it jumps poleward and a sudden transition occurs from an eddy-driven, equinoctial regime with two weak Hadley cells, to a near-angular-momentum-conserving, solstitial regime with a strong, cross-equatorial winter-hemisphere cell. Here, the controls on the transition latitude and rate are explored in idealized moist aquaplanet simulations. It is found that the transition remains rapid relative to the solar forcing when year length and slab-ocean heat capacity are varied, and, at Earth's rotation rate, always occurs when the ITCZ reaches approximately 7 degrees. This transition latitude is, however, found to scale inversely with rotation rate. Interestingly, the transition rate varies nonmonotonically with rotation, with a maximum at Earth's rotation rate, suggesting that Earth may be particularly disposed to a fast monsoon onset. The fast transition relates to feedbacks in both the atmosphere and the slab ocean. In particular, an evaporative feedback between the lower-level branch of the overturning circulation and the surface temperature is identified. This accelerates monsoon onset and slows withdrawal. Last, comparing eddy-permitting and axisymmetric experiments shows that, in contrast with results from dry models, in this fully moist model the presence of eddies slows the migration of the ITCZ between hemispheres. |
英文关键词 | Atmosphere Intertropical convergence zone Dynamics Hadley circulation Monsoons |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000475399700006 |
WOS关键词 | MEDIATED REGIME TRANSITIONS ; WIND-EVAPORATION FEEDBACK ; HADLEY CIRCULATIONS ; RADIATIVE-TRANSFER ; SEASONAL CYCLE ; PART II ; DYNAMICS ; ATMOSPHERES ; MODEL ; LAYER |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/185751 |
专题 | 地球科学 |
作者单位 | Univ Exeter, Coll Engn Math & Phys Sci, Exeter, Devon, England |
推荐引用方式 GB/T 7714 | Geen, Ruth,Lambert, F. Hugo,Vallis, Geoffrey K.. Processes and Timescales in Onset and Withdrawal of "Aquaplanet Monsoons"[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(8):2357-2373. |
APA | Geen, Ruth,Lambert, F. Hugo,&Vallis, Geoffrey K..(2019).Processes and Timescales in Onset and Withdrawal of "Aquaplanet Monsoons".JOURNAL OF THE ATMOSPHERIC SCIENCES,76(8),2357-2373. |
MLA | Geen, Ruth,et al."Processes and Timescales in Onset and Withdrawal of "Aquaplanet Monsoons"".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.8(2019):2357-2373. |
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