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Atmospheric Sulfur Deposition on Farmland in East China

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Pedosphere 2005年第1期15卷 120-128页

作者： WANGTi-Jian YANGHao-Ming GAOLi-Jie ZHANGYan HUZheng-Yi XUCheng-Kai departmentofatmosphericscience NanjingUniversityNanjing210093China departmentofatmosphericscience NanjingUniversityNanjing210093China／／KeyLaboratoryofMeteorologicalDisasterandEnvironmentalVariationNanjingInstituteofMeteorologyNanjing210044China StateKeyLaboratoryofSoilandSustainableAgriculture InstituteofSoilScienceChineseAcademyofScienceNanjing210008China

Atmospheric sulfur deposition onto typical farmland in East China was investigated using both field measurements and numerical modeling. The field measurements were conducted at the Experiment Station of Red Soil Ecology, Chinese Academy of Sciences, 10 km from Yingtan, Jiangxi Province, East China, between November 1998 and October 1999, and at the Changshu Ecological Experiment Station, Chinese Academy of Sciences, in a rapidly developing region of Jiangsu Province, East China, between April 2001 and Marc…

关键词： atmospheric sulfur deposition East China farmland

The influence of 30~60 d oscillation on the development of the South China Sea summer monsoon

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Acta Oceanologica Sinica 2004年第4期23卷 569-579页

作者： WENZhiping HEHaiyan HUANGRonghui ResearchCenterforMonsoonandEnvironment／departmentofatmosphericscience ZhongshanUniversityGuangzhou510275China InstituteofAtmosphericPhysics ChineseAcademyofSciencesBeijing100029China

Using the National Center for Enviromental Prediction/National Center for Atmospheric Research (NCEP/NCAR)reanalysis data and NOAA satellite-observed outgoing long-wave radiation (OLR) data, the development of theSouth China Sea (SCS) summer monsoon and intraseasonal (30~60 d) oscillation (ISO) have been examined. Theresults show that there exists obvious interannual variability of intraseasonal oscillaiton. Using the 16 a time series offiltered OLR averaged over the SCS, an index is defined to define onset events over the SCS on the ISO time *** the 16 a examined here, 10 shows a strong ISO signal in the onset of monsoon convection over the SCS. In thesecases, the ISO initially suppresses the seasonal development of southwesterly and cyclonic circulation over the SCSbefore the ISO onset. As the ISO propagates northeastward, the low frequency cyclonic circulation anomaly occursin the SCS and the low frequency southwesterly wind and convection over here dramatically intensify. The northeastprogression of the ISO anomaleis plays a role in the initial suppression and then acceleration of the seasonal cycle ofthe SCS summer monsoon.

关键词： influence intraseasonal oscillation SCS summer monsoon

Atmospheric Sulfur Deposition for a Red Soil Broadleaf Forest in Southern China

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Pedosphere 2004年第3期14卷 323-330页

作者： XUCheng-Kai HUZheng-Yi CAIZu-Cong WANGTi-Jian HEYuan-Qiu CAOZhi-Hong StateKeyLaboratoryofSoilandSustainableAgriculture InstituteofSoilScienceChineseAcademyofSciencesNanjing210008（China） departmentofatmosphericscience NanjingUniversityNanjing210093（China）

A two-year study in a typical red soil region of Southern China was conductedto determine 1) the dry deposition velocity (V_d) for SO_2 and particulate SO_4^(2-) above abroadleaf forest, and 2) atmospheric sulfur fluxes so as to estimate the contribution of variousfractions in the total. Using a resistance model based on continuous hourly meteorological data,atmospheric dry sulfur deposition in a forest was estimated according to V_d and concentrations ofboth atmospheric SO_2 and particulate SO_4^(2-). Meanwhile, wet S deposition was estimated based onrainfall and sulfate concentrations in the rainwater. Results showed that about 99% of the drysulfur deposition flux in the forest resulted from SO_2 dry deposition. In addition, the observeddry S deposition was greater in 2002 than in 2000 because of a higher average concentration of SO_2in 2002 than in 2000 and not because of the average dry deposition velocity which was lower for SO_2in 2002. Also, dry SO_2 deposition was the dominant fraction of deposited atmospheric sulfur inforests, contributing over 69% of the total annual sulfur deposition. Thus, dry SO_2 depositionshould be considered when estimating sulfur balance in forest ecological systems.

关键词： atmospheric sulfur deposition dry deposition velocity particulateSO_4^(2-) red soil, SO_2

Assimilation analysis of Rammasun typhoon structure over Northwest Pacific using satellite data

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Chinese Science Bulletin 2004年第4期49卷 389-395页

作者： ZHANGHua CHOUJifan QIUChongjian departmentofatmosphericscience LanzhouUniversityLanzhou730000China TrainingCenter/CMA Beijing100081China

The kinetic and thermodynamic structure of typhoon Rammasun (No. 0205) over the Northwest Pacific has been analyzed, using NOAA-16 polar orbiting Advanced Microwave Sounding Unit (AMSU) data collected on 2 July, 2002. The three-dimensional variational (3DVAR) assimila-tion technology is used to assimilate the satellite observation. The results show that the characteristics of the 3D typhoon structure can be more reasonably described from the assimi-lated data. The warm-cored structure of the typhoon is en-hanced in the analyzed field, which corresponds to strong typhoon. The typhoon cyclonic circulation in the middle and lower layers is apparently strengthened, and the strong anti-cyclonic circulation appears at the top of the typhoon. The water vapor and its supply in the typhoon are enhanced. The microwave assimilation data may be used to supply the lack of the conventional observation data over the tropical ocean.

关键词：台风同化分析微波探测器热力学动力学

Analyzing global trends of different cloud types and their potential impacts on climate by using the ISCCP D2 dataset

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Chinese Science Bulletin 2004年第12期49卷 1301-1306页

作者： DINGShouguo SHIGuangyu ZHAOChunsheng LASG InstituteofAtmosphericPhysicsChineseAcademyofSciencesBeijing100029China departmentofatmosphericscience SchoolofPhysicsPekingUniversityBeijing100871China

The International Satellite Cloud Climatology Project (ISCCP) D2 dataset is used to study the global dis- tribution of low, middle and high cloud amounts and their trends of 1983—2001. Evidences have shown that global warming has accelerated over the past 20 a and the 1990s was the warmest decade in the instrumental records since 1861. Trends of various clouds amounts over this period are analyzed by employing the linear regression method. The results show that global mean total cloud amounts, in general, have tended to reduce over the past 20 a. But there are slightly increasing by about 2% before 1987 and decreasing by about 4% since then. Cloudiness trends of both low and high clouds decrease while increase for the middle cloud. And there exist remarkable discrepancies in different regions. The preliminary analyses suggest that it is likely that the cloud change occurring over the past 20 a is a positive feed- back to global warming.

关键词： ISCCP D2数据集全球气候变暖国际卫星云图气候工程线性衰退方法大气环流模型

Characteristics of distribution and seasonal variation of aerosol optical depth in eastern China with MODIS products

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Chinese Science Bulletin 2003年第22期48卷 2488-2495页

作者： LIChengcai MAOJietait LAUKai-HonAlexis CHENJay-Chung YUANZibing LIUXiaoyang ZHUAihua LIUGuiqing departmentofatmosphericscience SchoolofPhysicsPekingUni-versityBeijing100871China CenterforCoastalandAtmosphericResearch TheHongKongUniversityofScienceandTechnology(HKUST)HongKongChina Atmospheric MarineandCoastalEnvironment(AMCE)ProgramHKUSTHongKongChina

The accuracy of MODIS aerosol products from the NASA Terra Satellite is validated in comparison with the results of sun-photometer observations in Beijing and Hong Kong. By analyzing the MODIS aerosol products within the period of August 2000 to April 2003, it is believed that human activities are the main source of aerosols in the eastern part of China. This is based on the facts that all areas with relatively high values are consistent with regions of dense population and fast economic development, such as the North China Plain, the Sichuan Basin and the Pearl River Delta. It is also supported by the distribution of 舗gstr鰉 exponents showing that most aerosols in the eastern part of China are closely related to human activities, excepting the strong sandstorm episodes occurring in spring, fall and winter. In contrast to developed countries, the 舗gstr鰉 exponent of urban area in China is lower than its surroundings, indicating that the contribution of local floating dust and soot attributed to human activities is significant. Results presented in this paper provide important data for further research on climatic change and environmental study.

关键词：中国东部地区沙暴大气浮质气候变化浮质光学深度

Influence of Arctic Oscillation on winter climate over China

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Journal of Geographical Sciences 2003年第2期13卷 208-216页

作者： GONGDaoyi WANGShaowu KeyLboratoryofEnvironmentalChangeandNaturalDisaster InstituteofResourcesScienceBeijingNormalUniversityBeijing100875China departmentofatmosphericscience PekingUniversilyBejing100871China

In this study the relationship between the Arctic Oscillation (AO) and climate in China in boreal winter are investigated. Correlation analysis for the last 41 years shows that the winter temperature and precipitation in China change in phase with AO. High positive correlation (>0.4) between temperature and AO appears in the northern China. High correlation coefficients between precipitation and AO cover the southern China (close to the South China Sea) and the central China (between 30 o -40 o N and east of ~100 o E), with the values varying between +0.3 and +0.4. It is found that during the past several decades the precipitation was strongly affected by AO, but for the temperature the Siberian High plays a more important role. At the interdecadal time scale the AO has significant influence on both temperature and precipitation. Multivariate regression analysis demonstrates that AO and the Siberian High related variance in temperature and precipitation is 35% and 11% respectively. For precipitation, however the portion is rather low, implying that some other factors may be responsible for the changes in precipitation, in addition to AO and the Siberian High.

关键词： Arctic Oscillation climate China CLC number:P461 P467

Regional characteristics of dust events in China

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Journal of Geographical Sciences 2003年第1期13卷 35-44页

作者： WANGShigong WANGJinyan ZHOUZijiang SHANGKezheng YANGDebao ZHAO 93864Army75UnitXinjiang Changji831112China departmentofatmosphericscience CollegeofResources＆EnvironmntLanzhouUniversityLanzhou730000China NationalMeteorologicalCenter Beijing100081China

The regional characteristics of dust events in China has b een mainly studied by using the data of dust storm, wind-blown sand and floating dust from 338 observation stations through China from 1954 to 2000. The results of this study are as follows: (1) In China, there are two h igh frequent areas of dust events, one is located in the area of Min feng and Hotan in the South Xinjiang Basin, the other is situated in the area of Minqin and Jilantai in the Hexi Region. Furthermore, th e spatial distributions of the various types of dust events are diffe rent. The dust storms mainly occur in the arid and semiarid areas co vering the deserts and the areas undergoing desertification in northern China. Wind-blown sand and floating-dust not only occur in the areas where dust storms occur, but also extend to the neighboring areas. The range of wind-blown sand extends northeastward and southeastward, b ut floating-dust mainly extends southeastward to the low-latitude region such as the East China Plain and the area of the middle and lower reaches o f the Yangtze River. Compared with wind-blown sand, the floating-dust seldo m occurs in the high latitude areas such as North Xinjiang and North east China. (2) The affected areas of dust storms can be divided into seven sub-regions, that is, North Xinjiang Region, South Xinjiang Reg ion, Hexi Region, Qaidam Basin Region, Hetao Region, Northeastern China Region and Qinghai-Xizang (Tibet) Region. The area of the most freque nt occurrence of dust storms and floating-dust is in South Xinjiang Region, and of wind-blown sand in the Hexi Region. In general, the frequency of d ust events in all the seven regions shows a decreasing tendency from 19 54 to 2000, but there are certain differences between various dust events in d ifferent regions. The maximum interannual change and variance of dust events during this time happened in South Xinjiang Region and Hexi Re gion. The dust events generally occur most frequently in April in most pa rts

关键词： dust events regional characteristics