The Impact of Meridional Wave Trains over East Asia on the Air Temperature over Central and East China in Midsummer Time

ZHANG Yinghua; LI Yan; LI Deshuai

doi:10.7522/j.issn.1000-0534.2016.00080

2017 , Vol. 36 >Issue 4: 1010 - 1021

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00080

The Impact of Meridional Wave Trains over East Asia on the Air Temperature over Central and East China in Midsummer Time

ZHANG Yinghua ,
LI Yan ,
LI Deshuai

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Unit 94582 of the Chinese People's Liberation Army, Queshan 463217, China;College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;Unit 94032 of the Chinese People's Liberation Army, Wuwei 733000, China

Received date: 2015-11-30

Online published: 2017-08-28

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Abstract

Based on the CN05 grid datasets of monthly mean surface air temperature from 1980 to 2008, the distribution of surface air temperature over Central and East China in July is studied, and three main modes are obtained, the three leading modes explained 44%, 17% and 11% of the total variance, respectively. The first mode shows a linear trend of surface air temperature over Jianghuai area in the North China and Northeast China in the last thirty years, the second mode shows a 'dipole'pattern between Jianghuai-Jiangnan area and the east portion of Northeast China, and the third mode shows a 'tripole'pattern between Huabei-Huanghuai area, the South China and the Northeast China. Because of the characteristics of the first mode have been discussed in a number of articles, the second and third modes account for the main component. The composite fields indicate that the meridional wave trains over East Asia play an important role on the second and third modes:When the meridional wave trains over East Asia and Western Pacific locate north, it's in favor of generating the above dipole pattern. When the wave trains locate south, it's in favor of generating the above tripole pattern. When the convective activities over South China and Taiwan Island is weaker than normal, it's favorable to generate the negative phase of the meridional wave trains corresponding to the second mode, and vice versa. In the composite fields of positive and negative years about the second mode, wave activity flux mainly point to north at low latitudes at the 850 hPa level near East Asian coast. At 300 hPa level, wave activity flux mainly point to north at low latitudes and point to east at middle latitudes. However, OLR and wave activity flux anamolies at low latitudes in the third mode are not significant.

Key words： Surface mean air tem; Dipole; Tripole; Meridional wave trai; Convective activitie; Decadal variability

Cite this article

ZHANG Yinghua , LI Yan , LI Deshuai . The Impact of Meridional Wave Trains over East Asia on the Air Temperature over Central and East China in Midsummer Time[J]. Plateau Meteorology, 2017 , 36(4) : 1010 -1021 . DOI: 10.7522/j.issn.1000-0534.2016.00080

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