Global warming mode of atmospheric circulation

Variations of global-mean atmospheric circulation are studied using the National Center of Environment Prediction/National Center of Atmosphere (NCEP/NCAR) reanalysis data set from January 1948 to February 2001 and CCM3.6 (Community Climate Model Version 3.6) simulations for the period 1990-1999. Em...

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Bibliographic Details
Published in:Atmospheric Science Letters
Main Authors: Zhu, Jinhong, Wang, Shaowu, Zhang, Xiangdong
Other Authors: Zhu, JH (reprint author), Peking Univ, Int Arctic Res Ctr, Dept Atmospher Sci, Sch Phys, Beijing, Peoples R China., Peking Univ, Int Arctic Res Ctr, Dept Atmospher Sci, Sch Phys, Beijing, Peoples R China., Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA.
Format: Journal/Newspaper
Language:English
Published: atmospheric science letters 2002
Subjects:
global zonal-mean atmospheric circulation
global warming
CCM3.6 simulations
EXTRATROPICAL CIRCULATION
ARCTIC OSCILLATION
ANNULAR MODES
VARIABILITY
PACIFIC
Arctic
Pacific
Global warming
Online Access:https://hdl.handle.net/20.500.11897/147830
https://doi.org/10.1006/asle.2002.0052
Description
Summary:Variations of global-mean atmospheric circulation are studied using the National Center of Environment Prediction/National Center of Atmosphere (NCEP/NCAR) reanalysis data set from January 1948 to February 2001 and CCM3.6 (Community Climate Model Version 3.6) simulations for the period 1990-1999. Empirical orthogonal function (EOF) analysis indicates that variations of zonal-mean geopotential height in the tropics are usually opposite to those over the subpolar zone in both hemispheres. The first mode of EOF analysis shows that height is higher than normal in the tropics when it is lower over the subpolar zone in both hemispheres with much stronger westerlies over mid latitudes in both hemispheres, and vice versa. This mode explains about 50% variance and is predominant in the troposphere. The time series of EOF1 has a sharp transition near about 1977 and the polarity changes from negative to positive. This mode is closely related to the variations of global mean surface air temperature. The detrended correlation coefficient between EOF1 time series and the surface air temperature is 0.74 in the boreal winter. Furthermore, the lowest correlation coefficient among the other three seasons, annual mean, seasonal mean and monthly mean is higher than 0.42 which indicate the fairly good relationship between this mode and the surface air temperature. The result has been verified using CCM3.6 simulations. (C) Royal Meteorological Society Geochemistry & Geophysics Meteorology & Atmospheric Sciences SCI(E) 1 ARTICLE 1 1-13 3

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