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Simulation of 1991-2005 Meiyu seasons in the Yangtze-huaihe region using BCC_RegCM 1.0

Chinese Science Bulletin 2010年第11期55卷 1077-1083页

作者： hu yamin1,2,3. ding yihui4 1 institute of tropical and marine meteorology, china meteorological administration,{3., china 2 Guangdong Climate Center,{3., china 3.Chinese Academy of meteorological Sciences, Beijing 100081, china 4 National Climate Center, china meteorological administration, Beijing 100081, china institute of tropical and marine {3. China Meteorological Administration Guangzhou 510080 China Guangdong Climate Center Guangzhou 510080 China Chinese Academy of meteorological Sciences Beijing 100081 China National Climate Center China Meteorological Administration Beijing 100081 China

By using BCC_RegCM 1.0 (RegCM for short) from Beijing Climate Center (BCC), china meteorological administration (CMA), the Meiyu season characters over the Yangtze-huaihe region during 1991-2005 are simulated. The major conclusions of this study may be summarized as the following: (1) RegCM can reproduce the interannual variation and the spatial distribution of the summertime precipitation and temperature in the Yangtze-huaihe region. (2) By use of a generalized Meiyu criterion and in accordance with model-calculated precipitation and temperature, the Meiyu onset and en{3. date have been determined. Compared with the observation, RegCM can simulate the interannual variation of the Yangtze-huaihe Meiyu with preferable capability for most of the normal Meiyu years (such as 1995, 1997, 2000, 2001, 2002 and 2004), especially for the rich Meiyu years of 1996, 1998 and 1999. (3. In terms of the average simulation for the recent 15 years, the timings of onset and en{3. of Meiyu occur on June 1 and July 13. respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 3. d, 3.d shorter than the observation. The index of Meiyu intensity is 2.45, while the climatological one is 3.00. Therefore, RegCM is capable of simulating the climatological Meiyu duration and intensity, while the capability of simulating the onset and en{3. date of Meiyu still needs to be improved.

关键词：梅雨季节模拟计算长江气候观测发病时间强度指数中国气象局空间分布

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An improvement on summer regional climate simulation over East china: Importance of data assimilation of soil moisture

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Chinese Science Bulletin 2010年第9期55卷 867-873页

作者： hu yamin1,2,3. ding yihui4 & LIAO Fei2 1 {3. of tropical and marine meteorology, china meteorological administration, guangzhou 510080, china 2 Guangdong Climate Center, guangzhou 510080, china 3.Chinese Academy of meteorological Sciences, Beijing 100081, china 4 National Climate Center, china meteorological administration, Beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i.e., BCC_RegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime season over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the magnitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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Simulation of 1991-2005 Meiyu seasons in the Yangtze-huaihe region using BCCRegCM 1.0

Simulation of 1991-2005 Meiyu seasons in the Yangtze-Huaihe ...

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第七届全国优秀青年气象科技工作者学术研讨会

作者： hu yamin1,2 ding yihui3.1 Guangdong Climate Center,{3., china 2 institute of tropical and marine meteorology, china meteorological administration,{3., china 3.National Climate Center, china meteorological administration, Beijing 100081, china

By using BCCegCM 1.0 (RegCM for short) from Beijing Climate Center (BCC), china meteorological administration (CMA), the Meiyu season characters over the Yangtze-huaihe region during 1991～2005 are simulated. The major conclusions of this study may be summarized as the following: (1) RegCM can reproduce the interannual variation and the spatial distribution of the summertime precipitation and temperature in the Yangtze-huaihe region. (2) By use of a generalized Meiyu criterion and in accordance with model-calculated precipitation and temperature, the Meiyu onset and en{3. date have been determined. Compared with the observation, RegCM can simulate the interannual variation of the Yangtze-huaihe Meiyu with preferable capability for most of the normal Meiyu years (such as 1995, 1997, 2000, 2001, 2002 and 2004), especially for the rich Meiyu years of 1996, 1998 and 1999. (3. In terms of the average simulation for the recent 15a, the timings of onset and en{3. of Meiyu occur on June 1 and July 13. respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 3. day, 3.days shorter than the observation. The index of Meiyu intensity is 2.45, while the climatological one is 3.00. Therefore, RegCM is capable of simulating the climatological Meiyu duration and intensity, while the capability of simulating the onset and en{3. date of Meiyu still needs to be improved.

关键词： regional climate model Meiyu in Yangtze-huaihe region Meiyu onset Meiyu ending Meiyu rainfall

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An improvement on summer regional climate simulation over East china: importance of data assimilation of soil moisture

An improvement on summer regional climate simulation over Ea...

引用

第七届全国优秀青年气象科技工作者学术研讨会

作者： hu yamin1, 2, ding yihui3.& LIAO Fei2 1 Guangdong Climate Center,{3., china 2 institute of tropical and marine meteorology, china meteorological administration,{3., china 3.National Climate Center, china meteorological administration, Beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i. e., BCCegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime sea-son over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the mag-nitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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Verification and Assessment of Real-time Forecasts of Two Extreme Heavy Rain Events in Zhengzhou by Operational NWP Models

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Journal of tropical meteorology 2021年第4期27卷 406-417页

作者： ZHONG Shui-xin ZhuANG Yan hu Sheng CHEN Zi-tong {3. Wei-yu FENG Ye-rong DENG Tao LIU Xian-tong ZHANG Yan-xia XU Dao-sheng DAI Guang-feng MENG Wei-guang Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction/guangzhou institute of tropical and {3. meteorology China Meteorological AdministrationGuangzhou 510080 China hubei meteorological Service Center Wuhan 430205 China

In the present study,the performances of the NWP models on two heavy rainfalls on 20 July and 22 August 2021 over Henan Province were *** impacts of the water vapor transport to the extreme rainfall were further *** results showed that the regional model system in the guangzhou meteorological Service generally showed high scores on the extreme rainfall over *** maximum 24h accumulative rainfall by the 24h forecasts by the CMA-GD reached 556 mm over Henan *** 24-h and 48-h Threat Score(TS)of heavy rainfall reached 0.56 and *** comparisons of the Fraction Skill Score(FSS)verifications of the heavy rainfall by CMA-GD and CMA-TRAMS at the radium of 40km reached 0.96 and *** water vapor transport to the extreme rainfall showed that the vertically integrated water vapor transport(IVT)of the whole layer before the occurrence of the heavy rainfall exhibited a double-eyes distribution in case 7·*** north eye over Henan reached the same magnitude of IVT as the typhoon eye(Cempaka)over south *** IVT over the lower troposphere(<500 hPa)showed an overwhelming magnitude than the upper level,especially in the planetary boundary layer(<700 hPa).More practical technique needs to be developed to improve its performances on the forecasting of extreme rainfall,as well as more experiments need to be conducted to examine the effects of the specific terrain and physical schemes on the extreme rainfall.

关键词： extreme rainfall CMA-GD IVT double-eyes distribution

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