中国科学院 | 大气所 | 网站地图 | 加入收藏
首 页  | | | 论文论著 | | 科学传播 | English  
  学术报告
学术报告
学术报告 您当前所在的位置: 首页 > 学术报告 > 学术报告
Climatology of Tibetan Plateau Vortices in Reanalysis Data and a High-resolution Global Climate Model
来源:LASG    访问次数:    报告时间:2018-11-15
【报告人】        Julia Curio
【报告人单位】National Centre for Atmospheric Science, University of Reading, UK
【报告时间】    2018年11月15日(星期四)9:00
【报告地点】    新楼1118会议室
【报告简介】    The Tibetan Plateau (TP) and surrounding high mountain ranges constitute an important forcing of the atmospheric circulation over Asia due to their height and extent, and thereby impact weather and climate in downstream regions of East Asia. Mesoscale Tibetan Plateau vortices (TPVs) are one of the major precipitation-producing systems on the TP. A fraction of TPVs move off the TP to the east and can trigger extreme precipitation in parts of China, that can result in severe flooding. In this study, the climatology of TPV occurrence is examined in two reanalyses and, for the first time, in a high-resolution global climate model using an objective feature-tracking algorithm. Most TPVs are generated in the north-western part of the TP; the centre of this main genesis region is small and stable throughout the year. The strength and position of the subtropical westerly jet seems to control the distance TPVs can travel eastwards.  Additionally, we hypothesize that the jet might have an impact on the annual cycle and the interannual variability of TPV occurrence frequency but the dynamical mechanism is unclear and will be subject of a future study. The results show that the global climate model is able to simulate TPVs at N512 (~25 km) horizontal resolution and in general agrees with the reanalyses.
 
© 1997-2010 大气科学和地球流体力学数值模拟国家重点实验室 版权所有 京ICP备06004370号
北京9804信箱LASG 邮编:100029 传真:82995172