中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and
Geophysical Fluid Dynamics (LASG)
Institute of Atmospheric Physics, Chinese Academy of Sciences

Vol. 2/No. 2 Apr 2017

[Climate Dynamics]Southern European summer rainfall enhances and reshapes the circumglobal teleconnection pattern

The summertime circumglobal teleconnection (CGT) is characterized by a wave train in mid latitudes of the Northern Hemisphere along the upper-tropospheric westerly jet. The CGT greatly impacts summer climate in mid latitudes. Many studies have highlighted the role of the tropical summer rainfall over India in the interannual variations of the CGT.

Recently, based on observational evidences and simulation results with a barotropic vorticity equation model and a linear baroclinic model, Lin et al. (2016, 2017) pointed out that summer rainfall in Southern Europe can also feed back to and strengthen the CGT pattern. Moreover, they further showed that in early summer, the southern European rainfall may also reshape the CGT pattern, forming an addition high-latitude wave train in addition to the mid-latitude wave train (Figure 1). Their studies provide an alternative mechanism for the formation and maintenance of the CGT.

                                 

 


Figure 1: Schematic diagram illustrating mechanism of the CGT. The red circles reflect effect of the enhanced Indian rainfall and the blue circles depict effect of the reduced Southern European rainfall, in which the high-latitude wave train consisting of three blue circles over northern Europe is only valid in early summer.

Citation:

Lin, Z.D., and R.Y. Lu, 2016: Impact of summer rainfall over southern-central Europe on circumglobal teleconnection. Atmos. Sci. Let., 17, 258-262, doi: 10.1002/asl.652.
Download: http://onlinelibrary.wiley.com/doi/10.1002/asl.652/full

Lin, Z.D., F. Liu, B. Wang, R.Y. Lu, and X. Qu, 2017: Southern European rainfall reshapes the early-summer circumglobal teleconnection after the late 1970s. Clim. Dyn., doi: 10.1007/s00382-016-3306-1.
Download: https://link.springer.com/article/10.1007/s00382-016-3306-1

Contact: Zhongda Lin, zdlin@mail.iap.ac.cn

 

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Editors:Wangchuanyi(wangcy@lasg.iap.ac.cn);Zhouwenling(zwl@lasg.iap.ac.cn);Chenkangjun(ckj@lasg.iap.ac.cn)