大气科学2011，Vol.35Issue(5)：847-862,16.
北半球大气对春季北极海冰异常响应的数值模拟
The Northern Hemisphere Atmospheric Response to Spring Arctic Sea Ice Anomalies in CAM3.0 Model
摘要
Abstract
The influence of Arctic Sea Ice Concentration (SIC) anomalies on the atmospheric general circulation during spring and summer is investigated with version 3. 0 of the NCAR Community Atmosphere Model (CAM3. 0). Regress the second EOF mode of ICE to observed ICE, and then added to climatic ICE as the external force of test The results show that on the intraseasonal time scale, the atmospheric circulation anomalies evolved from spring to summer, and the spring Arctic SIC anomalies were thermally and dynamically consistent with atmospheric circulation, surface temperature, and rainfall anomalies in spring and summer, especially contributing to less spring rainfall in eastern China and more summer rainfall in northeastern and central China. While on short time scales, the initial adjustment of the atmospheric circulation is characterized by relationship of out of phase in geopotential height anom-alies in the lower and upper troposphere locally, and after two weeks, the out of phase turned progressively to more barotropic with the responses propagating to remote areas, at last, the quasi-equilibrium stage of adjustment is reached in the sixth week. The remote responses are regarded as a stationary Rossby wave generated thermally and dynamically through an anomalous turbulent heat fluxes and atmospheric circulation internal varieties. At first, the surface heat fluxes were changed by anomalies in the Arctic SIC, and then a large scale stationary Rossby wave was triggered through the interaction with atmospheric circulation. The lower tropospheric response is baroclinic and thus favors upward emanation of wave activity flux in the negative height anomaly area; while, in upper levels, the energy is dispersed to East Asia through teleconnection, the internal varieties keeping the energy, and then affects the climate in this area.关键词
海冰/海冰密集度/夏季降水/敏感性试验/控制试验/瞬变过程/波活动通量Key words
sea ice, sea ice concentration, summer rainfall, sensitivity test, control test, transient process, wave activity flux分类
天文与地球科学引用本文复制引用
张若楠,武炳义..北半球大气对春季北极海冰异常响应的数值模拟[J].大气科学,2011,35(5):847-862,16.基金项目
公益性行业(气象)科研专项GYHY200906017、GYHY200706005,国家自然科学基金资助项目40875052、40921003,中国气象科学研究院资助项目“气候系统模式” （气象）
