Universität zu Köln

Gong, He, Huang, Mei, Zhu, Lin and Shao, Yaping ORCID: 0000-0002-2041-5479 (2019). Long-term variations of atmospheric angular momentum and torque. Meteorol. Atmos. Phys., 131 (6). S. 1697 - 1712. WIEN: SPRINGER WIEN. ISSN 1436-5065

Full text not available from this repository.

Abstract

In the absence of external torques, the earth system is a closed system and its angular momentum is conserved. The atmospheric angular momentum (AAM) exchange with the solid/liquid earth is achieved by friction and mountain torques. The variations of the AAM and torques are important indicators of global climate change. Using the NCEP/NCAR reanalysis data for 1948-2015, the long-term variations of the AAM and torques are analyzed. A weak positive AAM trend is detected, but an examination of the AAM budget shows that on annual to decadal scales, the signals of the AAM and total torque are inconsistent. During the study period, the total torque was mostly negative and had a decreasing trend, suggesting a decrease of the AAM. To check this inconsistency, we analyze the time series of the length-of-day anomalies, Delta LOD. It is found that Delta LOD is weakly correlated with the AAM, while the derivative of the earth's core-induced Delta LOD is strongly correlated with the torque. If this is correct, then a core-induced climate change can indeed happen.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gong, He UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Mei UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhu, Lin UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Yaping UNSPECIFIED orcid.org/0000-0002-2041-5479 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-126637
DOI:	10.1007/s00703-019-00663-y
Journal or Publication Title:	Meteorol. Atmos. Phys.
Volume:	131
Number:	6
Page Range:	S. 1697 - 1712
Date:	2019
Publisher:	SPRINGER WIEN
Place of Publication:	WIEN
ISSN:	1436-5065
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLAR MOTION; WIND-SPEED; LENGTH; CYCLE; CORE; FLUCTUATIONS; CIRCULATION; INCREASE; BALANCE; WINTER Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12663