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Title of Journal: Adv Atmos Sci

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Abbravation: Advances in Atmospheric Sciences

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SP Science Press

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DOI

10.1007/bfb0064491

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1861-9533

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Simulation of a persistent snow storm over souther

Authors: Zhijie Liao Yaocun Zhang
Publish Date: 2013/02/09
Volume: 30, Issue: 2, Pages: 425-447
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Abstract

A regional atmosphereocean coupled model RegCM3POM was developed by coupling the regional climate model RegCM3 with the Princeton Ocean Model POM The performance of RegCM3POM in simulating a persistent snow storm over southern China and the impact of the MaddenJulian oscillation MJO on this persistent snow storm were investigated Compared with the standalone RegCM3 the coupled model performed better at reproducing the spatialtemporal evolution and intensity of the precipitation episodes The power spectral analysis indicated that the coupled model successfully captured the dominant period between 30 and 60 days in the precipitation field leading to a notable improvement in simulating the magnitude of intraseasonal precipitation variation and further in enhancing the intensity of the simulated precipitation These improvements were mainly due to the wellsimulated lowfrequency oscillation center and its eastward propagation characteristics in each MJO phase by RegCM3POM which improved the simulations of MJOrelated lowfrequency vertical motions water vapor transport and the deep inversion layer that can directly influence the precipitation event and that further improved the simulated MJOprecipitation relationship Analysis of the phase relationship between convection and SST indicated that RegCM3POM exhibits a nearquadrature relation between the simulated convection and SST anomalies which was consistent with the observations However such a nearquadrature relation was not as significant when the standalone RegCM3 was used This difference indicated that the inherent coupled feedback process between the ocean and atmosphere in RegCM3POM played an important part in reproducing the features of the MJO that accompanied the snow storm

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