第八届青年地学论坛

The summertime anticyclonic circulation mode (SACM) is related to the recent substantial sea ice loss in the Arctic. In this review, we outline the potential causes of SACM and its influences on sea ice depletion. Triggers from local resources (i.e., sea ice loss and sea surface temperature (SST) variations) and spatiotemporal teleconnections (i.e., extratropical cyclone intrusion, tropic and mid-latitude SST anomaly, and preconditions in winter atmospheric circulation) are outlined. The influences of SACM on the dramatic sea ice loss are emphasized through inspecting the relevant dynamic (i.e. Ekman drift and export) and thermodynamic mechanisms (i.e., moist content, cloudiness, and the associated changes in radiation). Moreover, the motivation to investigate the underlying physical mechanisms of SACM in response to the recent substantial ice depletion is also clarified with an attempt to better understand the shifting ice-atmospheric interaction in the Arctic during summer. As an outlook, the record low sea ice extent in September 2012 could be reset in the near future provided the SACM-like scenario continues to exist during summer in the Arctic troposphere aloft.
 

邀请报告（张若楠），sea ice， arctic， summertime anticyclonic circulation