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第三届中日韩气象学术会议

作者： ZENG Qing-Cun~1 DONG Chao-Hua~2 PENG Gong-Bing~3.ZHAO Si-Xiong~1 FANG Zong-Yi~2 JIAO Mei-Yan~4 Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 china national satellite {3. center china {3. Administration Beijing 100081 china Institute of Geographic Sciences and Resource Research Chinese Academy of Sciences Beijing 100101 china national {3. center china {3. Administration Beijing 100081 china

＜正＞This is a report describing briefly the“Duststorm monitoring,Predicting and Warming system”.This system was developed by the scientists of china meteorological Administration,Chinese Academy of Sciences and some universities and applied as a subroutine in the national {3. meteorological {5. and the national meteorological {5. since 2002,and became an operational one in the daily routine service since *** system consists of the following components: the {3. remote sensing and the ground based observational network,the short- range numerical dust-weather prediction,extra-annual and extraseasonal prediction of anomalies of spring atmospheric circulation and soil moisture,renewable GIS （Geographic Information System）and the information and evaluation of related disasters.

关键词： duststorm monitoring predicting warning disaster evaluation climate prediction

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DETECTING TROPICAL CYCLONE WATER VAPOR TRANSPORTATION WITH THE TRMM AND ADVANCED MICROWAVE SOUNDING UNIT(AMSU)

DETECTING TROPICAL CYCLONE WATER VAPOR TRANSPORTATION WITH T...

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作者： WangXin~1 FangXiang~(1,2) Qiu Hong~1 Zhu Yuanjing~2 1 national satellite meteorological {3. of china meteorological Administration, Beijing,china,100081 2 Department of Atmospheric Science,School of Physics,Peking University, Beijing,china,100871

The AMSU-B data contain the vertical distribution of the retrieved water vapor from satellite brightness temperature. The tropical cyclone Matsa event in 2005.formed from the northwest pacific is analysised by combining the AMSU-B water vapor fields with the latent *** show the combination the TRMM latent heating data in the heavy precipitation area around TC,we find heat release is one of the most important factors to impact TC intensity,especially to the long-life and land load *** there is a time delay between the low level water vapor convergence and the middle layer latent heat,which will improve the real-time forecast of tropical cyclones.

关键词： Index Terms—One two three four five

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Global scale annual and semi-annual variations of daytime NmF2 in the high solar activity years

Global scale annual and semi-annual variations of daytime Nm...

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中国科学院地质与地球物理研究所2004学术年会

作者： Tao Yu~(a,b,*),Weixing Wan~a,Libo Liu~a,Biqiang Zhao~a a Institute of Geology and Geophysics.CAS.Beijing 100029.china b national satellite {3. center.CMA,Beijing {5..china

The annual and semi-annual variations of the ionosphere are investigated in the present paper by using the daytime F2 layer peak electron concentration(NmF2) observed at a global ionosonde network with 104 *** main features are outlined as follows.(1) The annual variations are most pronounced at magnetic latitudes of 40-60°in both hemispheres,and usually manifest as winter anomalies;Below magnetic latitude of 40°as well as in the tropical region they are much weaker and winter anomalies that are not obvious.(2) The semi-annual variations,which are usually peak in March or April in most regions,are generally weak in the near-pole regions and strong in the far-pole regions of both hemispheres.(3. Compared with their annual components,the semi-annual variations in the tropical region are more significant. In order to explain the above results,we particularly analyze the global atomic/molecular ratio of[O/N2]at the F2 layer peak height by the MSIS90 *** results show that the annual variation of[O/N2]is closely related with that of NmF2 prevailing in mid-latitudes and[O/N2]annual variation usually may lead to the winter anomalies of NmF2 occurring in the near-pole ***,NmF2 semi-annual variations appearing in the tropical region also have a close relationship with the variation of[O/N2].On the other hand,the semi-annual variations of NmF2 in the far-pole region cannot be simply explained by that of[O/N2],but the variation of the solar zenith angle may also have a significant contribution.

关键词： Ionospheric annual and semi-annual variation Winter anomaly Atomic/molecular ratio

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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...

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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.& LIAO Fei2 1 Guangdong Climate center, Guangzhou 5.0080, china 2 Institute of Tropical and Marine Meteorology, china meteorological Administration, Guangzhou 5.0080, china 3.{5. 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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像元分解法提取积雪边界线

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山地学报 2004年第1期22卷 110-115页

作者：延昊张国平中国气象局国家气象中心中国气象局国家气象中心北京　100081

利用NOAA16 AVHRR的多光谱数据进行像元分解提取积雪边界线。首先对遥感数据进行主成分分析,提取含99%信息量的前两个主分量,对其进行散点图分析,获取终元。进行多光谱混合像元分解,提取积雪盖度参数,并依据积雪盖度提取积雪边界线。同... 详细信息

利用NOAA16 AVHRR的多光谱数据进行像元分解提取积雪边界线。首先对遥感数据进行主成分分析,提取含99%信息量的前两个主分量,对其进行散点图分析,获取终元。进行多光谱混合像元分解,提取积雪盖度参数,并依据积雪盖度提取积雪边界线。同时比较了最大似然分类提取的积雪边界线,发现分类积雪边界线变化较大,而盖度积雪边界线比较稳定,主要原因是像元分解提取的积雪边界线物理意义明确。

关键词： NOAA-AVHRR 混合像元光谱线性混合模型最大似然分类

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Assessment of Dust Aerosol Optical Depth and Shortwave Radiative Forcing over the Northwest Pacific Ocean in Spring Based on satellite Observations

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Atmospheric and Oceanic Science Letters 2009年第4期 223-228页

作者： CHEN Lin 1,2,SHI Guang-Yu 1,ZHONG Ling-Zhi 3.and TAN Sai-Chun 1 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,china 2 Key laboratory of Radiometric Calibration and Validation for Environmental satellites (KLRCV),national satellite Meteorology center,china meteorological Administration (NSMC/CMA),Beijing,100081,china 3.State Key Laboratory of Severe Weather,Chinese Academy of meteorological Sciences,Beijing 100081,china State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical FluidDynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beo＇ing 100029 China Key laboratory of Radiometric Calibration and Validation for Environmental satellites （KLRCV） National Satellite Meteorology center China Meteorological Administration （SMC/CMA） Beijing 100081 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China

Dust aerosol optical depth (AOD) and its ac-companying shortwave radiative forcing (RF) are usually simulated by numerical ***,by using 9 months of Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol product data in combination with Clouds and the Earth’s Radiant Energy System Single Scanner Footprint (CERES/SSF) data,dust AOD and its shortwave RF were estimated over the cloud-free north-west (NW) Pacific Ocean in the springs of 2004,2005.and *** results showed that in this region,the mean dust AOD and its shortwave RF were 0.10 and 5.5. W m 2,*** order to validate the dust AOD de-rived by MODIS,results from the Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model were also used *** correlation coefficient between the monthly averaged dust AOD derived by MODIS measurements and the model simulation results was approximately *** the estimates of the dust AOD and its shortwave RF obtained in this study are based mainly on {3. data,they offer a good reference for numerical models.

关键词： dust aerosols optical depth shortwave radiative forcing northwest Pacific satellite measurements

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Numerical simulations of the bi-level and branched structure of intracloud lightning flashes

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Science china Earth Sciences 2006年第6期49卷 661-672页

作者： TAN Yongbo1, TAO Shanchang1, ZHU Baoyou1, MA Ming2 & LU Weitao2 1. School of Earth and Space Sciences, University of Science and Technology of china, Hefei 23.026, china 2. Chinese Academy of meteorological Sciences, Beijing {3., china School of Earth and Space Sciences University of Science and Technology of China Hefei China Chinese Academy of meteorological Sciences Beijing China

Intracloud (IC) lightning flashes have been simulated in fine resolution (12.5.m) by using a bidirectional stochastic lightning parameterization scheme within 2-dimensional domain. The simu-lated results show that the IC flashes have a bilevel channel structure and the altitudes of the hori-zontal channels are at the same heights of potential wells, which are supported by the previous VHF source observations and balloon soundings of electric field profile in the thundercloud. Further con-clusions are: (1) After an IC flash is initiated near the boundary between positve and nagetive charge zone, the negative (or positive) leader tends to propagate into the positive (or negative) charge zone. Both types of positive and negative IC flashes have been reproduced and their polarity depends on the up and down disposition of the positive and negative charge regions. (2) The extension range of leaders is correlative with the cloud charge distribution. The leader is possible to extend through the inverted charge region all over where it is extending, but keeps away from the isolated charge area of the same polarity. (3. The channel structures also depend on the electric potential distributions in the thundercloud. Before propagating into the central area of potential wells, the leader tends to extend along the direction with the maximum of potential gradient. Once extending away from the center of potential wells, the leader tends to extend along the direction with the slowest potential change. (4) The IC flash channels have the fractal feature with fractal dimension 1.45.before leaders pass through the central area of charge regions. The exponent decreases rapidly once leaders extend into the low-density charge regions. (5. The induced charges of opposite polarity are deposited in the leader channels within preexisting positive and negative charge regions during IC flash discharges. This causes a new and complicated charge distribution in the thundercloud, and the potential

关键词： IC, lightning parameterization, branched bilevel structure, fractal feature, propagation tendency.

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Data Assimilation of Dust Aerosol Observations for CUACE/Dust Forecasting System

Data Assimilation of Dust Aerosol Observations for CUACE/Dus...

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第三届中日韩气象学术会议

作者： T.Niu~1 S.L.Gong~(2 1) G.F.Zhu~3.H.L.Liu~1 X.Q.Hu~4 C.H.Zhou~1 Y.Q.Wang~1 ~1center for Atmosphere Watch & Services(CAWAS)Chinese Academy of meteorological Sciences china meteorological Administration(CMA) Beijing 100081 {5. ~2Air Quality Research Division Science & Technology Branch Environment Canada 4905.Dufferin Street Toronto Ontario M3. 5.4 Canada ~3.tate Key Laboratory of Severe Weather Chinese Academy of meteorological Sciences china meteorological Administration(CMA) Beijing 100081 {5. ~4{13. satellite meteorological center china meteorological Administration(NSMC/CMA) Beijing 100081 {5.

＜正＞A data assimilation system （DAS） was developed for the Chinese Unified Atmospheric Chemistry Environment-Dust （CUACE/Dust） forecast system and applied in the operational forecasts of sand and dust storm （SDS） in spring *** system is based on a three dimensional variational method （3.-Var） and uses extensively the measurements of surface visibility and dust loading retrieval from the Chinese geostationary satellite *** results show that a major improvement to the capability of CUACE/Dust in forecasting the short-term variability in the spatial distribution and intensity of dust concentrations has been achieved,especially in those areas far from the source *** seasonal mean Threat Score （TS） over the East Asia in spring 2006 increased from 0.22 to 0.3. by using the data assimilation system, a 41% *** assimilation results usually agree with the dust loading retrieved from FY-2C and visibility distribution from surface meteorological stations, which indicates that the 3.-Var method is very powerful for the unification of observation and numerical modeling results.

关键词： data assimilation 3.-Var method visibility satellite dust loading

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Operational retrieval of Asian sand and dust storm from FY-2C geostationary meteorological satellite and its application to real time forecast in Asia

Operational retrieval of Asian sand and dust storm from FY-2...

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“2010年北京气象学会中青年优秀论文评选”学术研讨会

作者： X.Q.Hu~(1,3.,N.M.Lu~1,T.Niu~2,and P.Zhang~1 1 Key Laboratory of Radiometric Calibration and Validation for Environmental satellites(KLRCV),national satellite {3. center,{5. {3. Administration(NSMC/CMA),Beijing 100081,{5. 2 Centre for Atmosphere Watch & Services(CAWAS),Chinese Academy of {3. Sciences,{5. {3. Administration(CMA),Beijing 100081,{5. 3.Institute of remote sensing applications,Chinese Academy of Sciences,Beijing 100101,{5.

This paper describes an operational retrieval algorithm for the sand/dust storm(SDS) from FY-2C/SVISSR (Stretched-Visible and Infrared Spin-Scan Radiometer) developed at the national satellite meteorological {3. (NSMC) of *** algorithm,called Dust Retrieval Algorithm based on Geostationary Imager(DRAGI), is based on the optical and radiative physical properties of SDS in mid-infrared and thermal infrared spectral regions as well as the observation of all bands in the geostationary imager, which include the Brightness Temperature Difference (BTD) in split window channels,Infrared Difference Dust Index(IDDI) and the ratio of middle infrared reflectance to visible *** also combines the visible and water vapor bands observation of the geostationary imager to identify the dust clouds from the surface targets and meteorological *** output product is validated by and related to other dust aerosol observations such as the synoptic weather reports,surface visibility,aerosol optical depth(AOD) and ground-based PM *** the SDS-IDD product and a data assimilation scheme,the dust forecast model CUACE/Dust achieved a substantial improvement to the SDS predictions in spring 2006.

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Mineral Aerosol Properties Observed in the North-West Region of china

Mineral Aerosol Properties Observed in the North-West Region...

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中国气象学会2006年年会“大气成分与气候、环境变化”分会场

作者： Chang-Song Gai 1, Xiao-Qing Li2, Feng-Sheng Zhao 2,* * 1 Chong Qing meteorological bureau,Chongqing 401147, 2national satellite meteorological center,Beijing, {5.

The aerosol optical depth and Angstr?m exponent for 2002 - 2003.were derived from CE-3.8 sun/sky photometer observations carried out at Tazhong, Hetian, Minqin and Dunhuang, located in the source regi

关键词： Asian dust mineral aerosol aerosol optical depth Angstr?m exponent

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