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	Spatial and Temporal Variations of Global Frictional Torque during the Period 1948-2011
	Gong H.; Huang, M.; Zhu, L.; Guo, S. L.; Shao, Y. P.
	2016
关键词	frictional torque atmospheric angular momentum wind speed atmospheric angular-momentum madden-julian oscillation cycle budget
英文摘要	Frictional torque is an important mean for momentum exchange between the atmosphere and earth, and significantly influences the variation in atmospheric angular momentum. Using NCEP-NCAR reanalysis data for the period 1948-2011, we examined the spatial and temporal patterns of frictional torque. It was found that the globally integrated frictional torque turned from positive to negative in 1972, suggesting that angular momentum was transferred from the earth to the atmosphere before 1972, but from the atmosphere to the earth thereafter. The global frictional torque steadily declined from 1948 to 1994, but has been increasing since 1995. It was also found that the global frictional torque is mainly determined by the wind systems in the mid and low latitudes of the Southern Hemisphere (SH), where large changes in frictional torque occurred during the study period. Westerly wind increased continuously in the midlatitudes after 1948, while easterly wind decreased in the tropics of the SH after the 1980s.
出处	Journal of Meteorological Research
卷	30
期	1
页	128-134
语种	英语
ISSN号	2095-6037
DOI标识	10.1007/s13351-015-5066-y
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/42957]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Gong H.,Huang, M.,Zhu, L.,et al. Spatial and Temporal Variations of Global Frictional Torque during the Period 1948-2011. 2016.

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