題  目：Sudden Stratospheric Warming in Mid-latitude?

時(shí)  間：2011年11月21日(周一), 上午9:30

地  點(diǎn)：九章大廈土星廳

報(bào)告人：Chiao-Yao She教授， 美國科羅拉多州立大學(xué)物理系

Abstract：We present observations at Fort Collins (40.6oN, 105oW) of the diurnal mean wind and temperature in the mesosphere-lower thermosphere (MLT) region (80-100 km) during the major Sudden Stratospheric Warming (SSW) in 2009. We deduce their anomalous behaviors in connection with this event. The mean wind and temperature measurements, made with the Colorado State University (CSU) sodium Doppler wind temperature lidar reveal that the mean temperature at 80 km is about 30 K lower than the climatological mean, while the mean zonal wind ranges between ~ -10 to 0 m/s from 80 to 97 km and before turn eastward above, which is almost opposite to its climatological characteristic. We use observations from the TIMED-SABER satellite observations and simulations from the SP-WACCM model to investigate the global perspectives of this dynamical anomaly observed at Fort Collins.  The observations and model reveal that the anomaly associated with the 2009 SSW, with major disturbances in the stratosphere and mesosphere, indeed have extended from the polar region to Fort Collins.  These simultaneous wind- and temperature-lidar observations document the direct impact of a major SSW on the dynamic and thermal circulation of the mid-latitude MLT.

She教授是美國科羅拉多州立大氣物理系教授，國際著名激光遙感及大氣物理學(xué)專家。She教授提出的激光測量技術(shù)解決了基礎(chǔ)的以及應(yīng)用的問題，特別是在瑞利-米散射激光雷達(dá)和鈉熒光多普勒激光雷達(dá)探測低層和高層大氣溫度和風(fēng)場方面取得了國際前沿性創(chuàng)新成果。目前，鈉熒光多普勒激光雷達(dá)能夠24小時(shí)連續(xù)探測中間層頂區(qū)域的溫度和風(fēng)場，其技術(shù)已經(jīng)被國際同行廣泛借鑒。