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DOI | 10.5194/acp-2020-424 |
Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential field | |
Arata Amemiya and Kaoru Sato | |
2020-05-19 | |
发表期刊 | Atmospheric Chemistry and Physics |
出版年 | 2020 |
英文摘要 | The spatial pattern of subseasonal variability of the Asian monsoon anticyclone is analyzed using long-term reanalysis data, focusing on the large-scale longitudinal movement. The air inside the anticyclone is quantified by a thickness-weighted low PV area on an isentropic surface. It is shown that the longitudinal movement of the air inside the Asian monsoon anticyclone has a timescale of one to two weeks, which is shorter than the monthly dominant timescale of the variability in the anticyclone intensity. The movement of the anticyclonic air is suggested to be largely controlled by passive advection. The typical time evolution of the variability pattern, explained by two leading EOF components of 100 hPa geopotential height, shows large-scale geopotential anomalies moving westward spanning from low to middle latitudes. This corresponds well with the rapid westward movement of low-PV air known as eddy sheddingand following eastward retreat of the anticyclonic air. The two EOF components can also explain the bimodal longitudinal distribution of geopotential maximum location. |
领域 | 地球科学 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/267544 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Arata Amemiya and Kaoru Sato. Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential field[J]. Atmospheric Chemistry and Physics,2020. |
APA | Arata Amemiya and Kaoru Sato.(2020).Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential field.Atmospheric Chemistry and Physics. |
MLA | Arata Amemiya and Kaoru Sato."Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential field".Atmospheric Chemistry and Physics (2020). |
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