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Preprints
https://doi.org/10.5194/acp-2020-424
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-424
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 19 May 2020

Submitted as: research article | 19 May 2020

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This preprint is currently under review for the journal ACP.

Characterizing quasi-biweekly variability of the Asian monsoon anticyclone using potential vorticity and large-scale geopotential field

Arata Amemiya1 and Kaoru Sato2 Arata Amemiya and Kaoru Sato
  • 1RIKEN Center for Computational Science, Kobe, Japan
  • 2Department of Earth and Planetary Science, Faculty of Science, The University of Tokyo, Tokyo, Japan

Abstract. 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 shedding and following eastward retreat of the anticyclonic air. The two EOF components can also explain the bimodal longitudinal distribution of geopotential maximum location.

Arata Amemiya and Kaoru Sato

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Arata Amemiya and Kaoru Sato

Arata Amemiya and Kaoru Sato

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Short summary
The spatial pattern of sub-seasonal variability of the Asian monsoon anticyclone (AMA) is analyzed using long-term reanalysis data, integrating two different views using potential vorticity and geopotential height anomaly. This study provides a link between two existing description of the Asian monsoon anticyclone, which is important for the understanding of the whole lifecycle of its characteristic sub-seasonal variability pattern.
The spatial pattern of sub-seasonal variability of the Asian monsoon anticyclone (AMA) is...
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