Inter-hemispheric asymmetry in polar mesosphere summer echoes and temperature at 69° latitude

被引：16

作者：

Morris, Ray J. ^{[1
]}

Klekociuk, Andrew R. ^{[1
]}

Latteck, Ralph ^{[2
]}

Singer, Werner ^{[2
]}

Holdsworth, David A. ^{[3
]}

Murphy, Damian J. ^{[1
]}

机构：

[1] Australian Antarctic Div, Kingston, Tas 7050, Australia

[2] Leibniz Inst Atmospher Phys, Kuhlungsborn, Germany

[3] Atmospher Radar Syst, Thebarton, SA, Australia

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2009年 / 71卷 / 3-4期

关键词：

MST radar; PMSE; Mesosphere; Temperature; Inter-hemispheric; NOCTILUCENT CLOUDS; WATER-VAPOR; PMSE;

D O I：

10.1016/j.jastp.2008.09.042

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

An inter-hemispheric asymmetry is found in the characteristics of polar mesosphere summer echoes (PMSE) and upper mesosphere temperatures at conjugate latitudes (similar to 69 degrees) above Antarctica and the Arctic. The second complete mesosphere-stratosphere-troposphere (MST) radar summer observation season at Davis (68.6 degrees S) revealed that PMSE occur less frequently. with lower strength and on average I km higher compared with their northern counterparts at Andenes (69.3 degrees N). We consider the thermodynamic state of the mesosphere for conjoining hemispheric summers based on satellite and ground-based radar measurements, and show the mesopause region near similar to 80-87 km of the Southern Hemisphere (SH) to be up to 7.5 K warmer than its Northern Hemisphere (NH) counterpart. We show that this is consistent with our observation of asymmetries in the characteristics of PMSE and demonstrate how the mesosphere meridional wind field influences the existence and strength of the echoes in both hemispheres. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.

引用

页码：464 / 469

页数：6

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