Eastward propagating planetary waves with periods of 1-5 days in the winter Antarctic stratosphere as revealed by MERRA and lidar

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Title:	Eastward propagating planetary waves with periods of 1-5 days in the winter Antarctic stratosphere as revealed by MERRA and lidar
Authors:	張起維;Lu, Xian;Chu, Xinzhao;Fuller-Rowell, Tim;Chang, Loren;Fong, Weichun;Yu, Zhibin
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Earth, ocean, space;eastward propagating planetary waves;Eliassen-Palm flux;Exact sciences and technology;External geophysics;Fe Boltzmann lidar;jet instability;MERRA;Meteorology;winter Antarctic stratosphere
Date:	2013-09-16
Issue Date:	2026-04-23 11:03:35 (UTC+8)
Publisher:	Wiley-Blackwell;Hoboken, NJ: Blackwell Publishing Ltd
Abstract:	摘要： This study presents the first report of planetary wave (PW) influences on significant temperature perturbations (10–20 K) within a course of one day detected by an Fe lidar from 35 to 51 km in the austral winter of 2011 at McMurdo (77.8°S, 166.7°E), Antarctica. Such large temperature perturbations are captured in the Modern Era Retrospective‐Analysis for Research and Applications (MERRA) data and correspond to various phases of eastward propagating PWs with periods of 1–5 days as revealed in MERRA. The strongest PW dominating the temperature perturbations has a period of 4–5 days with wavenumber −1. A 2−day wave with wavenumber −2 and a 1.25−day wave with wavenumber −3 also have significant influences. We find that these eastward propagating PWs are highly confined to winter high latitudes, likely because negative refractive indices equatorward of ~45°S result in evanescent wave characteristics and prevent the PWs from propagating to lower latitudes. The Eliassen‐Palm flux divergence and instability analyses suggest that barotropic/baroclinic instability at 50°S–60°S induced by the stratospheric polar night jet and/or the “double‐jet” structure is the most likely wave source. Such instability in the region poleward of 70°S is a complementary source for the 4−day wave, where we find that the heat flux of the 4−day wave is large and transported from ~70°S toward the pole above 40 km. This transport direction is likely linked to the meridional gradient of background temperature. The migrating diurnal tide near 78°S in the upper stratosphere is discernable, but significantly smaller than that of the dominant 4−day wave. Key Points First report of PW influences on lidar temperatures in polar stratosphere. The PWs are generated by the instability of the double‐jet structure. Significant momentum and heat fluxes are linked with the dominating PWs. 其他題名： J. Geophys. Res. Atmos 出版者： Hoboken, NJ: Blackwell Publishing Ltd 出版日期： 2013-09-16 出處： Journal of geophysical research. Atmospheres, 2013-09, Vol.118 (17), p.9565-9578 資源來源： Wiley Online Library Journals 版權： 2013. American Geophysical Union. All Rights Reserved. 版權： 2014 INIST-CNRS 識別號： ISSN: 2169-897X 識別號： ISSN: 2169-8996 識別號： EISSN: 2169-8996 識別號： DOI: 10.1002/jgrd.50717
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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