首页|2008年6月一次华南暴雨过程的云分辨模拟分析

2008年6月一次华南暴雨过程的云分辨模拟分析

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  • 国家科技期刊平台
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  • NSTL
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GCE(Goddard Cumulus Ensemble)模式中体现了云与云之间的相互作用,以及云与周围环境、长波辐射及示踪气体等之间的相互作用.模式可通过云中的水凝物等微物理量描述云体的生命史(发展、成熟、消散),并在此基础上通过引入地面降水诊断方程对降水的发展过程进行分析,因而降水过程实际上是云的发展过程的体现.本文所使用的二维云分辨模式(2DCRM)就是GCE模式的二维版本.利用该模式对2008年6月10-15日的华南暴雨过程进行模拟,分析了主要降水时段地面降水收支及热量收支在不同降水发展阶段的特征.模拟结果表明,在降水初始阶段,主要由局地大气增湿和水汽辐合率减小来抑制降水发展；在成熟阶段,局地水汽变化、水汽辐合、地面蒸发和局地水凝物变化均有正的贡献,降水强度达到最大；在衰退阶段,降水强度减小的主要原因是水汽辐合显著减小.在降水性层状云区,降水主要来自于水汽辐合,水汽的主要消耗项是局地水汽增加；在对流云区,降水主要来自于水汽辐合与局地大气变干,水汽的主要消耗过程是水凝物生成并向降水性层状云区输送.初始阶段和衰退阶段的局地大气温度变化率相对较小,成熟阶段区域平均大气冷却达到最强,区域平均大气温度变化率主要受区域平均的热辐散率与区域平均的潜热释放影响.
Analysis of cloud-resolving simulation of a heavy rainfall process in South China during June 2008
The GCE(Goddard Cumulus Ensemble) model shows the interactions of clouds with each other,with their surroundings,with long wave radiative transfer processes,and with trace gas distributions. On one hand, the model can explain the growth,mature and decay processes (life cycle) of clouds by the cloud microphysical quantities,such as the hydrometeor change,etc.;on the other hand,based on the cloud microphysical processes,it can also be used to analyze rainfall process by introducing surface rainfall equation. Therefore,the precipitation processes actually reflect of cloud development processes. The cloud-resolving model discussed in this paper is the two-dimensional version of the Goddard Cumulus Ensemble Model. Based on the model,a heavy rainfall event in South China from 10 to 15 June 2008 is simulated. The characteristics of water vapor budgets and heat budgets are analyzed in the different phases of major surface rainfall period. Results show that the rainfall process is mainly repressed by local atmospheric moistening and water vapor convergence decreasing during the onset phase, while the local water vapor change, water vapor convergence, surface evaporation, and local hydrometeor change make positive contributions to the rainfall process during the mature phase, which leads to a maximum rain rate. In the decay phase, the major reason for the small rain rate is that the water vapor convergence is reduced significantly. In raining stratiform regions,the main water vapor source is water vapor convergence, while the main water vapor sink is local water vapor increasing. In convective regions , the main water vapor source is water vapor convergence and local atmospheric drying, while the main water vapor sink is local hydrometeor gain and transportation of hydrometeor from convective regions to raining stratiform regions. The local atmosphere heat change is small during the onset and decay phases, but during the mature phase, the local atmosphere cooling reaches the maximum. Time and domain means of the heat divergence and the latent heat release are the main reasons to cause the local atmospheric cooling.

heavy rainfall in South Chinacloud-resolving modelsurface rainfall budgetconvective rainfallstratiform rainfall

张楠、沈新勇、杨宇红、王涛

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气象灾害教育部重点实验室(南京信息工程大学),江苏南京210044

沈阳中心气象台,辽宁沈阳110016

南宁市气象局,广西南宁530028

沈阳区域气候中心,辽宁沈阳110016

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华南暴雨 云分辨模式 地面降水收支 对流降水 层云降水

国家重点基础研究发展规划(973计划)国家重点基础研究发展规划(973计划)国家自然科学基金国家自然科学基金广西科技厅科研项目江苏高校优势学科建设工程资助项目

2013CB4301032011CB40340541075039411750650719005-3-2PAPD

2013

大气科学学报
南京信息工程大学

大气科学学报

CSTPCDCSCD北大核心
影响因子：1.558
ISSN：1674-7097
年,卷(期)：2013.36(4)
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