题名: |
Summer Atmospheric Circulation Over Greenland in Response to Arctic Amplification and Diminished Spring Snow Cover. |
作者: |
Preece, J. R; Mote, T. L; Cohen, J; Wachowicz, L. J; Knox, J. A; Tedesco, M; Kooperman, G. J. |
摘要: |
The exceptional atmospheric conditions that have accelerated Greenland Ice Sheet mass loss in recent decades have been repeatedly recognized as a possible dynamical response to Arctic amplification. Here, we present evidence of two potentially synergistic mechanisms linking high-latitude warming to the observed increase in Greenland blocking. Consistent with a prominent hypothesis associating Arctic amplification and persistent weather extremes, we show that the summer atmospheric circulation over the North Atlantic has becomewavierandlinkthiswavierflowtomoreprevalentGreenlandblocking. While a concomitant decline in terrestrial snow cover has likely contributed to this mechanism by further amplifying warming at high latitudes, we also show that there is a direct stationary Rossby wave response to low spring North AmericansnowcoverthatenforcesananomalousanticycloneoverGreenland, thus helping to anchor the ridge over Greenland in this wavier atmospheric state. |
总页数: |
15 pages |