冬季海洋锋面对大气河影响的理想数值试验研究OA北大核心CSTPCD

By using WRF(Weather research and forecasting)model,two sets of idealized numerical experiments with different strengths of oceanic front are conducted.By using the ideal channel model,the influence of oceanic front on AR(atmospheric river)in winter is investigated and the influence of to-pography is ignored.The results show that the response of wind speed and turbulent heat flux in the low-level atmosphere in the two sets of experiments is in phase with the change of SST(sea surface tem-perature),while the response of low-level atmosphere in the south of the front is larger than that in the north,showing a meridional asymmetry in the response to SST change.The strengthening of oceanic front intensified the vertical eddy heat and water vapor fluxes,resulting in a larger wind speed and a northward shift of the storm track in upper troposphere.Under the effect of the intensified oceanic front,more moisture and momentum are in-taken when a cyclone passing by,which facilities the forma-tion of the high water vapor transport zone in the south of cyclones.To this extent,the increase of ocean front facilities the occurrence of ARs and intensified the AR strength.