Possible Linkage between Land Surface Thermal Anomalies in Mid-High Latitudes of Eurasian Continent and Atmospheric General Circulation in Winter

XU Chen; CHEN Haishan; HUANG Lingfang

doi:10.7522/j.issn.1000-0534.2014.00062

2015 , Vol. 34 >Issue 6: 1584 - 1592

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00062

Possible Linkage between Land Surface Thermal Anomalies in Mid-High Latitudes of Eurasian Continent and Atmospheric General Circulation in Winter

XU Chen ,
CHEN Haishan ,
HUANG Lingfang

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Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster (Nanjing University of Information Science & Technology), Ministry of Education, Nanjing 210044, China;2. School of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. Shanghai Meteorological Sci-Tech Service Center, Shanghai 200030, China

Received date: 2014-01-16

Online published: 2015-12-28

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Abstract

Based on ERA40 monthly reanalysis data, the features of the land surface thermal anomalies over the mid-high latitudes of the Eurasian Continent during 1958-2001 were investigated, and the possible linkage between the land surface thermal anomalies and the atmospheric general circulation was further explored. Because of the global warming in recent years, the land surface temperature warming trend is more obvious and higher in the north of Lake Balkhash and Lake Baikal than the lower latitudes. Due to the inhomogeneously meridional land surface thermal changes, there is an apparent decadal weakening of the meridional land surface temperature gradient over the mid-latitude region of Eurasian Continent (around 40°N-50°N) at the early 1980. Decreased meridional gradient of the surface soil temperature tends to decrease the meridional gradients of both the surface air temperature and the air temperature in the lower atmosphere. According to thermal wind theory, decreased meridional temperature gradient will result in the decrease of the atmospheric baroclinicity. Meanwhile, the gradient of low level troposphere temperature, the vertical shear of zonal wind and zonal wind itself will be decreased.

Key words： Land surface thermal; General circulation; Meridional temperatu; Vertical wind shear; Global warming

Cite this article

XU Chen , CHEN Haishan , HUANG Lingfang . Possible Linkage between Land Surface Thermal Anomalies in Mid-High Latitudes of Eurasian Continent and Atmospheric General Circulation in Winter[J]. Plateau Meteorology, 2015 , 34(6) : 1584 -1592 . DOI: 10.7522/j.issn.1000-0534.2014.00062

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