青海地区冬季气温年际变化及其成因分析

doi:10.13249/j.cnki.sgs.2015.01.99

Abstract

Abstract:

Interannual variation of temperature in winter over Qinghai and its mechanisms are analyzed using data(1961-2010) from 38 stations over the region as well as National Centers for Environmental Prediction(NCEP) reanalysis data. It unveiled that there exist two major temperature anomaly patterns in winter over Qinghai: unipole mode from north to south and dipole mode between east and west region. During cold winter a “+-+” wave train lay over mid-high latitude with a quasi-barotropic vertical structure. West Pacific index has the most prominent correlation with time coefficient of prime component 1, secondly, the Euro-Asian index and Pacific-North America index. Sea surface temperature anomalies (SSTA) over the south part of North Atlantic in winter may influence atmosphere circulations over Europe and Asian by setting off a Euro-Asian train. Besides, SSTA in both west wind drift and Kuroshio current region have a negative feedback to the East Asian winter monsoon. Also during an El Nino Modoki episode, moist warm air from low latitude transport northward no farther than East China, which make colder winter in Qinghai on account of strong westerly and boreal airflow.

Key words: Qinghai region, winter temperature, teleconnection, Interannual variation

CLC Number:

P461

Ji WANG, Hong-yan SHEN, Ying-juan ZHANG, Zhen-yu WANG. Interannual Variability and Its Causes of Winter Temperature in Qinghai Region[J].SCIENTIA GEOGRAPHICA SINICA, 2015, 35(1): 99-106.

Figures/Tables 10

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References 29

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EOF 模态	北极涛动 (AO)	太平洋北美型（PNA）	北大西洋涛动（NAO）	太平洋西部型（WP）	北太平洋涛动（NPO）	欧亚遥相关（EU）
提前一季	-0.08	0.13	0.09	0.45	0.03	0.11
同季	-0.20	-0.331	-0.23	0.62	0.21	-0.46

Nino指数	(0)	(-1)	(-2)	(-3)
Nino3	0.17	0.05	0.16	0.07
Nino4	0.21	0.13	0.16	0.17

Interannual Variability and Its Causes of Winter Temperature in Qinghai Region

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