Stratospheric Oscillation and Stratosphere-Troposphere Coupling in 2007/2008 Winter
Received date: 2009-01-19
Revised date: 2009-02-20
Online published: 2009-03-10
Based on the NCEP/NCAR reanalysis data, the features of the stratospheric oscillations and the stratosphere-troposphere coupling in 2007/2008 winter were analyzed. It was found that the stratospheric polar vortex was persistently stronger during this winter. It was elongated and eccentrically developed along Eastern Asia and Atlantic, and shrank along Western-Euro and Mediterranean since the early December, 2007. Consequently, the “one ridge and one trough” pattern first appeared in the high stratosphere in the eastern hemisphere. These anomalous stratospheric signals were then propagated systematically downward; it took about 15~20 days for them to advance from 10 hPa to lower tropospheric levels. Following the propagated signals from upper levels, the corresponding “high-in-west and low-in-east” pattern in the high latitude, and “high-in-east and low-in-west” pattern in the subtropics at 500 hPa were clearly seen. They are closely related with the anomalous centers, such as the Siberia blocking high, Okhotsk low, Western-Pacific-Subtropical-High and lows in the mid-western part of Euro-Asia continent, which together favored the formation of sever snow in the south China. Further investigations indicated that there also existed poleward propagations of the stratospheric circulation anomalies that were found generated in the deep tropics. The stratospheric circulation anomalies responsible to the occurrence of the stratospheric polar vortex oscillations in January of 2008 could be tracked back to as early as the middle October in 2007. Accompanying the poleward propagation, the stratospheric anomaly signals were seen moving eastward simultaneously. In all, results from this work are strongly suggesting that our potential ability in predicting the climatic tendency in the troposphere could be significantly improved by catching with the leading stratospheric signals effectively.
LIN Rong-Cai , XIANG Chun-Yi , HE Jin-Hai . Stratospheric Oscillation and Stratosphere-Troposphere Coupling in 2007/2008 Winter[J]. Advances in Earth Science, 2009 , 24(3) : 338 -348 . DOI: 10.11867/j.issn.1001-8166.2009.03.0338
[1] Thompson D W, Wallace J M. The Arctic Oscillation signature in the wintertime geopotential height and temperature fields[J]. Geophysical Research Letter, 1998, 25(9):1 297-1 300.
[2] Baldwin M P, Dunkerton T J. Statospheric harbingers of anomalous weather regimes[J].Science, 2001, 294(5 542):581-584.
[3] Baldwin M P, Stephenson D B. Stratosphere memory and skill of extended-rang weather forecasts[J].Science,2003, 301(5 633): 636-640.
[4] Christiansen B. Downward propagation and statistical forecast of the near-surface weather[J].Journal of Geophysical Research,2005, 110: D14104.
[5] Cai M, Ren R C. Meridional and downward propagation of atmospheric circulation anomalies: Part I: Northern hemisphere cold season variability[J].Journal of Atmospheric Sciences, 2007, 64:1 880-1 901.
[6] Ren R C, Cai M. Meridional and vertical out-of-phase relationship of temperature anomalies associated with the Northern Annular Mode Variability[J].Geophysical Research Letters,2007, 34:L07704.
[7] Zhao Sixiong, Sun Jianhua. Multi-Scale systems and conceptual model on freezing rain and snow storm over southern China during January-February 2008[J].Climate and Environmental Research, 2008,13(4):351-367.[赵思雄，孙建华. 2008年初南方雨雪冰冻天气的环流场与多尺度特征[J].气候与环境研究，2008,13(4):351-367.]
[8] Sun Jianhua, Zhao Sixiong. Quasi-stationary front and stratification structure of the freezing rain and snow storm over southern China in January 2008[J].Climate and Environmental Research,2008,13(4):368-384.[孙建华，赵思雄.2008年初南方雨雪冰冻灾害天气静止锋与层结结构分析[J].气候与环境研究，2008,13(4):368-384.]
[9] Yang Hui, Li Chongyin. Influence of arctic oscillation on temperature and precipitation in winter[J].Climate and Environmental Research,2008,13(4):395-404.[杨辉，李崇银.冬季北极涛动的影响分析[J].气候与环境研究，2008,13(4):395-404.]
[10] Liu Yi,Zhao Yanhua, Guan Zhaoyong. Influences of stratospheric circulation anomalies on tropospheric weather of the heavy snowfall in January 2008[J].Climate and Environmental Research,2008,13(4):548-555.[刘毅，赵燕华，管兆勇.平流层环流异常对2008年1月雪灾过程的影响[J].气候与境研究，2008,13(4):548-555.]
[11] Kalnay E M, Kanamitsu M, Kistler R, et al. The NCEP/NCAR 40-year reanalysis Project[J].Bulletin of the American Meteorologica Society,1996,77: 437-431.
[12] Holton J R, Haynes P H, Mclntyre M E, et al. Stratosphere-troposphere exchange[J].Reviews of Geophysics,1995,33(4):403-439.
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