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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 institute 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

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

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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, 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 institute of tropical and marine meteorology 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 ending 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 ending of Meiyu occur on June 1 and July 13, respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 32 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 ending 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

Urban effects and summer thunderstorms in a tropical cyclone affected situation over guangzhou city

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Science china Earth Sciences 2007年第12期50卷 1867-1876页

作者： MENG WeiGuang1,3,YAN Jinghua1 & hu HaiBo2 1 institute of tropical and marine meteorology,Chinese meteorological administration(CMA),guangzhou 510080,china 2 institute of Urban meteorology,CMA,Beijing 100089,china 3 State Key Laboratory of Severe Weather,Chinese Academy of meteorological Sciences,Beijing 100081,china 1. institute of tropical and marine meteorology Chinese Meteorological Administration (CMA) Guangzhou 510080 China 3. State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China 2. institute of Urban meteorology CMA Beijing 100089 China

With data mainly from guangzhou mesonet Automatic Weather Stations(AWS),guangzhou Doppler Radar and satellite TBB data,characteristics and evolution of the urban heat island(UHI) over Guang-zhou City were analyzed in a tropical cyclone affected situation for early August *** particular,two thunderstorms occurring during this period respectively at the night of 4 August and in the afternoon of 7 August were investigated to study the relationships between the development of thunderstorms and the *** showed that two thunderstorms were associated with the UHI *** induced local air convergence and initiated the thunderstorm *** cases showed a general agreement in time and space for the locations of maximum UHI,convergence,convection,and *** was found to be more favorable to developing in time periods and locations with stronger intensity of *** also showed that,due to the urban effects,both thunderstorms got strengthened when moving over guangzhou City,with maximum radar echoes observed right over the urban area and precipitation located within the *** these features reveal that two thunderstorms were urban-induced storms.

关键词： summer thunderstorms, urban heat islands (UHI), urban effects, tropical cyclone

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

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

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

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, guangzhou 510080, china 2 institute of tropical and marine meteorology, china meteorological administration, guangzhou 510080, 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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Simulation of 1991-2005 Meiyu seasons in the Yangtze-Huaihe ...

Characteristics of Spatiotemporal Distribution of Sea Surface Wind along the East Coast of Guangdong Province

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, guangzhou 510080, china 2 institute of tropical and marine meteorology, china meteorological administration, guangzhou 510080, 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 ending 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 ending of Meiyu occur on June 1 and July 13, respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 32 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 ending 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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Journal of meteorological Research 2018年第4期32卷 627-635页

作者： fei liao hua DENG Pak-wai CHAN guangzhou meteorological Observatory Guangzhou 511430 guangzhou institute of tropical and marine meteorology China Meteorological AdministrationGuangzhou 510080 Guangdong Ecological meteorology Center Guangzhou 510080 Hong Kong Observatory Hong Kong 999077

We analyzed the frequency distribution characteristics of wind speeds occurring at different offshore sites within a range of 0-200 km based on the sea surface wind data captured via buoys and oil platforms located along the east coast of Guangdong Province. The results of the analysis showed that average wind speed measured for each station reached a maximum in winter while minima occurred in summer, corresponding to obvious seasonal variation, and average wind speed increased with offshore distance. The prevailing wind direction at the nearshore site is the east-erly wind, and the frequency of winds within 6-10 m s^-1 is considerable with that of winds at 〉 10 m s^-1. With the in-crease of the offshore distance, the winds were less affected by the land, and the prevailing wind direction gradually became northerly winds, predominately those at 〉 10 m s^-1. For areas of shorter offshore distance （〈 100 km）, sur-face wind speeds fundamentally conformed to a two-parameter Weibull distribution, but there was a significant dif-ference between wind speed probability distributions and the Weibull distribution in areas more than 100 km off-shore. The mean wind speeds and wind speed standard deviations increased with the offshore distance, indicating that with the increase of the wind speed, the pulsation of the winds increased obviously, resulting in an increase in the ra-tio of the mean wind speed to the standard deviation of wind speed. When the ratio was large, the skewness became negative. When a relatively great degree of dispersion was noted between the observed skewness and the skewness corresponding to the theoretical Weibull curve, the wind speed probability distribution could not be adequately de-scribed by a Weibull distribution. This study provides a basis for the verification of the adaptability of Weibull distri-bution in different sea areas.

关键词： sea surface wind probability distribution observation buoy oil platform

The research on boundary layer evolution characteristics of Typhoon Usagi based on observations by wind profilers

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Acta Oceanologica Sinica 2017年第9期36卷 39-44页

作者： liao fei DENG hua GAO Zhiqiu CHAN Pak-wai guangzhou meteorological Observatory Guangzhou 511430 China guangzhou institute of tropical and marine meteorology China Meteorological Administration Guangzhou 510080 China Guangdong Ecological meteorological Center Guangzhou 510080 China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Hong Kong Observatory Hong Kong 999077 China

Vertically exploring the characteristics of the typhoon boundary layer（TBL） plays an important role in recognizing typhoon structure. The boundary layer radial direction and tangential wind characteristics of Typhoon Usagi based on the observational data of three boundary layer wind profiler stations along the route of Typhoon Usagi（No. 1319） and by combining with sounding data. The results show that：（1） maximum tangential wind appears in the vicinity of the eye area of Usagi, and it basically maintains a height of around 1 800 m when Usagi keeps a strong typhoon level, with the rapidly decreasing strength of Usagi after it lands, the speed of the maximum tangential wind and its vertical range both decrease;（2） the height of the maximum tangential wind is close to that of the inflow layer top of the typhoon, and is greater than that of the boundary layer estimated on the basis of Richardson number or potential temperature gradient, while the height of mixed layer judged on the basis of the signal-to-noise ratio（SNR） or its gradient is usually low;（3） the the boundary layer height can reach higher than2 100 m before Usagi lands. When the typhoon level or above is achieved, the boundary layer height observed by various stations does not change much, basically staying at between 1 200 and 1 600 m. With the decreasing strength of Usagi after its landfall, the boundary layer height rapidly drops.

关键词： typhoon boundary layer height wind profiler sounding

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火箭引雷至架空线路与地面电流对比分析

电工技术学报 2024年第3期39卷 914-923页

作者：蔡力杜懿阳胡强彭向阳陈绍东武汉大学电气与自动化学院武汉430072 广东电网有限责任公司电力科学研究院广州510000 中国气象局广州热带海洋气象研究所广州510080

2018—2019年夏季在广州从化开展了火箭引雷试验,雷击对象分为两种,分别是架空线路和地面。对比了两种引雷情况下各阶段雷电流的电流波形参数的差异,发现引雷至地面情况下初始阶段的最大电流、平均电流、转移电荷、作用积分分别是引雷... 详细信息

2018—2019年夏季在广州从化开展了火箭引雷试验,雷击对象分为两种,分别是架空线路和地面。对比了两种引雷情况下各阶段雷电流的电流波形参数的差异,发现引雷至地面情况下初始阶段的最大电流、平均电流、转移电荷、作用积分分别是引雷至架空线路情况下的2.8、2.4、2.0、5.3倍。引雷至地面情况下回击的上升时间几何均值为0.25μs,小于引雷至线路情况下的0.60μs,而对于电流峰值等其他回击波形参数而言,差异不明显。M分量与初始连续电流脉冲类似,引雷至线路情况下的电流峰值、转移电荷、连续电流水平均小于引雷至地面情况下的。基于诺顿电流源等效电路模型分析两种引雷情况下雷电流不同阶段存在差异的原因,可能是雷电在不同电流阶段时其通道等效阻抗不一样所导致的。

关键词：火箭引雷架空线路雷电流回击

Digital mapping of pesticides bioconcentration by integrating remote sensing techniques and plant uptake model

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International Journal of Digital Earth 2023年第1期16卷 2152-2167页

作者： Chenyang Xu Shuangqiao liao Minghao Lin Qian Yue Jizhe Xia School of Agriculture Sun Yat-sen UniversityGuangdongPeople’s Republic of China Modern Agricultural Innovation Center Henan Institute of Sun Yat-sen UniversityZhumadianPeople’s Republic of China institute of tropical and marine meteorology People’s Republic of China Meteorological AdministrationGuangzhouPeople’s Republic of China Department of Urban Informatics Shenzhen UniversityShenzhenPeople’s Republic of China

Although pesticides have been widely used worldwide to enhance crop yield and product quality,most pesticides are harmful to the environment and human *** absorb pesticides mainly from air and ***,the soil-plant pathway is essential for pesticide *** factor(BCF)has extensively been applied to evaluate potential plant contamination by pesticides from ***,this study developed a simplified plant transpiration-based plant uptake model(PT-model)to estimate plant pesticides’BCF from soil based on plant *** sensing techniques were employed to generate spatiotemporal continuous plant transpiration via *** BCF mapping was achieved by integrating PT-model with Moderate Resolution Imaging Spectroradiometer(MODIS)remotely sensed *** results were compared with a verified model driven by relative humidity and air temperature(RA-model),which has been confirmed byfindings from previous *** estimated BCF was within the boundaries of the RA-model,indicating the simulation’s overall *** this study,the BCF temporal trend estimated by the proposed method agreed with the RA-model assimilating meteorology datasets,while the spatial distribution was partially ***,the proposed method generates the spatiotemporal patterns of pesticide BCF with relatively consistent results supported by previous records andfindings.

关键词： Pesticide bioconcentration factor evapotranspiration plant uptake model remote sensing

Scalar Flux-Gradient Relationships under Unstable Conditions over Coastal Water

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Scalar Flux-Gradient Relationships under Unstable Conditions...