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Imprint of the ENSO on Rainfall and latent heating Variability over the Southern South China Sea from TRMM Observations

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Journal of Ocean University of China 2016年第2期15卷 219-231页

作者： WANG Lei HUANG Ke State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction Technologies College of Ocean and MeteorologyGuangdong Ocean University

Analyses of the Tropical Rainfall Measuring Mission （TRMM） datasets revealed a prominent interannual variation in the convective-stratiform rainfall and latent heating over the southern South China Sea （SCS） during the winter monsoon between 1998 and 2010. Although the height of maximum latent heating remained nearly constant at around 7km in all of the years, the year-to- year changes in the magnitudes of maximum latent heating over the region were noticeable. The interannual variations of the convee- tive-stratiform rainfall and latent heating over the southern SCS were highly anti-correlated with the Nifio-3 index, with more （less） rainfall and latent heating during La Nifia （El Nifio） years. Analysis of the large-scale environment revealed that years of active rain- fall and latent heating corresponded to years of large deep convergence and relative humidity at 600hPa. The moisture budget diag- nosis indicated that the interarmual variation of humidity at 600hPa was largely modulated by the vertical moisture advection. The year-to-year changes in rainfall over the southern SCS were mainly caused by the interannual variations of the dynamic component associated with anomalous upward motions in the middle troposphere, while the interannual variations of the thermodynamic com- ponent associated with changes in surface specific humidity played a minor role. Larger latent heating over the southern SCS during La Nifia years may possibly further enhance the local Hadley circulation over the SCS in the wintertime.

关键词： TRMM satellite rainfall latent heating southern South China Sea E1 Nifio-Southem Oscillation (ENSO)

Features of rainfall and latent heating structure simulated by two convective parameterization schemes

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Science China Earth Sciences 2011年第4期54卷 1779-1788页

作者： WANG XiaoCong BAO Qing LIU Kun WU GuoXiong LIU YiMin State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics （LASG） Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Numerical Weather Prediction Center China Meteorological Administration Beijing 100081 China

Using the latest version of SAMIL (Spectral Atmosphere Model of IAP LASG) developed by LASG/IAP,we evaluate the model performance by analyzing rainfall,latent heating structure and other basic fields with two different convective parameterization schemes:Manabe Scheme and Tiedtke *** show that convective precipitation is excessively overestimated while stratiform precipitation is underestimated by Tiedtke scheme,thus causing less stratiform rainfall proportion compared with TRMM *** contrast,for Manabe scheme stratiform rainfall belt is well simulated,although precipitation center near Bay of Bengal (BOB) spreads eastward and northward associated with unrealistic strong rainfall downstream of the Tibet *** simulated latent heating structure indicates that Tiedtke scheme has an advantage over Manabe scheme,as the maximum convective latent heating near middle of troposphere is well ***,the stratiform latent heating structure is also well simulated by Tiedtke scheme with warming above freezing level and cooling beneath freezing *** for Manabe scheme,the simulated maximum convective latent heating lies near 700 hPa,lower than the ***,the warming due to stratiform latent heating extends to the whole vertical levels,which is unreasonable compared with *** diagram further indicates that Tiedtke scheme is superior to Manabe scheme as higher correlation between model output and observation data is achieved when Tiedtke scheme is employed,especially for the temperature near 200 ***,a possible explanation is addressed for the unrealistic stratiform rainfall by Tiedtke scheme,which is due to the neglect of detrained cloud water and cloud ice during convective *** speculation is verified through an established sensitivity experiment.

关键词： Manabe scheme Tiedtke scheme stratiform rainfall convective rainfall latent heating SAMIL

Two types of summertime heating over the Asian large-scale orography and excitation of potential-vorticity forcing I. Over Tibetan Plateau

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Science China Earth Sciences 2016年第10期59卷 1996-2008页

作者： WU GuoXiong ZHUO HaiFeng WANG ZiQian LIU YiMin State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences School of Atmospheric Sciences Sun Yat-sen University

Based on numerical simulation, this study explored the characteristics and interactions of surface sensible heating and atmospheric latent heating over the main part of the Tibetan Plateau, i.e., terrain at elevations >2 km in summer. The impacts of these two types of heating on local vertical motion and monsoonal meridional circulation were compared. Theoretical analysis and numerical experimentation demonstrated that by changing the configuration of the upper-tropospheric air temperature and circulation, the two types of heating could generate both minimum absolute vorticity and abnormal potential vorticity forcing near the tropopause, enhance the meridional circulation of the Asian summer monsoon, and produce an eastward-propagating Rossby wave train within the mid-latitude westerly flow. Consequently, the manifestations of these features were shown to influence the circulation of the Northern Hemisphere.

关键词： Tibetan Plateau Surface sensible heating latent heating Monsoonal meridional circulation Potential vorticity forcing

A Modified Moist Ageostrophic Q Vector

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Advances in Atmospheric Sciences 2008年第6期25卷 1053-1061页

作者：岳彩军寿绍文 Shanghai Typhoon Institute China Meteorological Administration Laboratory of Typhoon Forecast Technique/China Meteorological Administration School of Atmospheric Sciences Nanjing University of Information Science and Technology

The quasi-geostrophic Q vector is an important rainfall associated with large-scale weather systems diagnostic tool for studying development of surface and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.

关键词： moist ageostrophic Q vector modification latent heating torrential rainfall associated with mei-yu front

A NUMERICAL INVESTIGATION OF THE IMPACT OF MOIST PROCESSES UPON THE STRUCTURE OF ACTIVE COLD FRONTS:APPLICATION OF A 3D MESOSCALE MODEL IN FRONTAL SITUATIONS

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Acta meteorologica Sinica 1996年第4期10卷 463-472页

作者：俞小鼎 EvelyneRichard RobertRosset Department of Atmospheric Sciences Beijing Meteorological College.Beijing 100081 Laboratore

A 3D mesoscale model is applied in a marine cold front case in order to investigate the impact of latent heating on the structure of cold *** of the moist and dry simulations are compared to stress the effects of moist *** is found that both the temperature gradient and the cyclonic vorticity across the frontal zone considerably increase due to the latent heating,especially in the lower troposphere.A thermally direct cross-front ageostrophic *** by frontogenesis,is found better developed and organized in the moist case than in the dry *** cross-front direct ageostrophic circulation,particularly its ascending branch,is considerably enhanced by latent heating due to increased frontogenetical forcing and reduced effective static stability in the rising motion region where condensation *** important feature in most observed cold fronts is the presence of an intense rising cell just above their leading *** intense rising cell is well simulated in the moist case but is less clear and much weaker in the dry case,indicating the important contribution by the la- tent heat release to the formation of this intense updraft above the surface cold front.

关键词： structure of cold front numerical simulation latent heating 3D mesoscale model

Vertical Structure and Seasonal Characteristics of Convective and Stratiform Rainfall and heating over South China Sea Using TRMM Data

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Vertical Structure and Seasonal Characteristics of Convectiv...