南海季風(fēng)區(qū)冰相相變潛熱對(duì)中尺度對(duì)流云和降水影響作用的數(shù)值模擬研究
[Abstract]:The meso-scale convective system (Mesoscal Convective System, in the northern South China Sea from May 15 to June 11, 1998 is simulated and analyzed by using the distinguishable cloud model and the average horizontal wind field, potential temperature field and water vapor field in the northern part of the South China Sea. The effects of latent heat of ice phase transition on cloud and precipitation, radiation transport and large-scale environmental field in MCS). The results show that the latent heat of ice phase change does not cause obvious change of atmospheric radiation flux, but it will cause obvious change of heat flux of underlying surface. The latent heat release of condensation significantly increases the atmospheric stability, resulting in the weakening of convective and underlying surface heat fluxes, which leads to the decrease of surface precipitation by 10.11%. The latent heat release of freezing also increases the atmospheric stability, which is not conducive to the development of meso-scale convective system, and the regional cumulative precipitation decreases by 2.2%. The cooling effect of melting latent heat lowers the atmosphere below the melting layer, thus increasing the instability of the lower atmosphere, which is beneficial to the transport of sea surface heat flux and leads to an increase of 4.1% in MCS precipitation. Therefore, the influence of ice phase change latent heat on precipitation is mainly due to the change of regional precipitation by affecting the stability of atmospheric environment, and then affecting the vertical transport and convective development of sensible heat flux and latent heat flux on ocean surface.
【作者單位】: 中國科學(xué)院大氣物理研究所;中國氣象科學(xué)研究院;
【基金】:國家自然科學(xué)基金項(xiàng)目41375005、41005072、40575003~~
【分類號(hào)】:P732
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