违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 南海季风区冰相相变潜热对中尺度对流云和降水影响作用的数值模拟研究-Numerical Studies of Influences of Ice-Phase Change Induced Diabatic Heating on Mesoscale Convective Clouds and Precipitation over the South China Sea Monsoon Region
doi:  10.3878/j.issn.1006-9585.2016.15280
南海季风区冰相相变潜热对中尺度对流云和降水影响作用的数值模拟研究

Numerical Studies of Influences of Ice-Phase Change Induced Diabatic Heating on Mesoscale Convective Clouds and Precipitation over the South China Sea Monsoon Region
摘要点击 239  全文点击 311  投稿时间:2015-12-23  
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基金:  国家自然科学基金项目41375005、41005072、40575003
中文关键词:  南海季风试验(SCSMEX)  中尺度对流系统  相变潜热  降水
英文关键词:  South China Sea Monsoon Experiment (SCSMEX)  Mesoscale convective systems  Diabiatic heating due to the ice-phase change  Precipitation
     
作者中文名作者英文名单位
付丹红FU Danhong中国科学院大气物理研究所, 北京 100029
郭学良GUO Xueliang中国气象科学研究院, 北京 100081
引用:付丹红,郭学良.2016.南海季风区冰相相变潜热对中尺度对流云和降水影响作用的数值模拟研究[J].气候与环境研究,21(6):687-699,doi:10.3878/j.issn.1006-9585.2016.15280.
Citation:FU Danhong,GUO Xueliang.2016.Numerical Studies of Influences of Ice-Phase Change Induced Diabatic Heating on Mesoscale Convective Clouds and Precipitation over the South China Sea Monsoon Region[J].Climatic and Environmental Research(in Chinese),21(6):687-699,doi:10.3878/j.issn.1006-9585.2016.15280.
中文摘要:
      利用可分辨云模式及中国南海北部试验区加密探空的平均水平风场、位温场和水汽场模拟分析了1998年5月15日至6月11日中国南海北部地区中尺度对流系统(Mesoscal Convective System,简称MCS)中冰相相变潜热对云和降水、辐射传输以及大尺度环境场的影响作用。研究表明,冰相相变潜热总体上不会引起明显的大气辐射通量的变化,但会引起较明显的下垫面热通量的变化。凝华潜热释放显著地增加了大气稳定度,造成对流和下垫面热通量的减弱,从而导致地面降水减小10.11%。碰冻潜热释放也使得大气稳定度增加,不利于中尺度对流系统对流的发展,区域累积降水量减小2.2%。融化潜热的冷却效应,使得融化层以下的大气降温,从而增加了低层大气的不稳定性,有利于海面热通量的输送,导致MCS降水增加4.1%。因此,冰相相变潜热对降水的影响主要是通过影响大气环境稳定,进而影响洋面感热通量和潜热通量的垂直输送和对流的发展,导致区域降水改变。
Abstract:
      A cloud-resolving model (CRM) and sounding data observed in the South China Sea Monsoon Experiment (SCSMEX) from 15 May to 11 June 1998 are used in this study to explore the effects of diabiatic heating induced by the ice-phase change on mesoscale convective system (MCS), precipitation, radiation, and the large scale environment. The results show that the effects of the latent heat released by the ice-phase change on the net cloud radiation can be neglected, but the diabatic heating leads to obvious changes in heat fluxes at the ocean surface. The latent heat released during the sublimation and deposition processes has a heating effect on the large-scale environment, and the atmospheric stratification becomes more stable. As a result, latent and sensible heat fluxes at the ocean surface both decrease, convective activities become weak, and precipitation decreases by about 10.11% over the northern South China Sea (SCS). The freezing process can also result in a more stable atmosphere, which is not favorable for the development of mesoscale convective system and thereby leads to a decrease in the accumulated rainfall over the northern SCS by about 2.2%. The melting process can lead to an increase in accumulated rainfall over the northern SCS, which is mainly attributed to its cooling effect on large-scale environment below the melting level. This cooling effect produces an unstable atmosphere at the lower levels, and increases the sensible heat flux transfer from the ocean surface to the atmosphere. Precipitation increases subsequently. The melting process can increase the accumulated rainfall by about 4.1%. Therefore, the diabatic heating influences precipitation mainly by directly influences the atmospheric stability, which affects vertical transport of latent and sensible heat fluxes at the ocean surface and mesoscale convective system development. Precipitation over the northern SCS changes correspondingly.
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