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Moisture transport source/ sink structure of the Meiyu rain belt along the Yangtze River valley

Chinese Science Bulletin 2004年第2期49卷 181-188页

作者： xuxiangde CHENLianshou WANGXiurong MIAOQiuju TAOShiyan ChineseAcademyofMeteorologicalSciences Beijing100081China NationalMeteorologicalCenter Beijing100081China InstituteofAtmosphericPhysics ChineseAcademyofSciencesBeijing100029China

Based on the analyses of the moisture transport structure in the whole layer of the troposphere along the Yangtze River valley during draught/flood years using the NCEP reanalysis data, this paper reveals that there exists a key region with a “Large Triangle” shape of transporting moisture for the Tibetan Plateau to Meiyu Belt and its“source/sink” structure; discloses that the interannual variation of the whole budget of inflow and outflow of moisture through the boundaries of a “Large Triangle” key region has the in-phase characteristic. Then a moisture transport structure over the skirt of the plateau and a conceptual model on the “transfer post” of moisture transport in the area of the South China Sea-Tibetan Plateau-Yangtze River valley in summer are put forward in this paper: the anti-phase feature of whole layer moisture transport flow patterns of Yangtze River valley during drought/flooding years is exhibited using the computational scheme of whole layer moisture transport correlation vector fields; a comprehensive dynamic model and its physical diagram of the teleconnection source/sink structure of the moisture transport of the Meiyu rain belt have been made. It shows that the moisture transfer effect over the skirt of the plateau from the ocean (Indian Ocean, South China Sea and west North Pacific) led to a moisture confluence belt in the Yangtze River valley and the teleconnection moisture transport source/sink structure over the “Large Triangle” shape area in flooding years.

关键词：梅雨地区扬子江水分转移天气预报

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Localized 3D-structural features of dynamic-chemical processes of urban air pollution in Beijing winter

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Chinese Science Bulletin 2003年第8期48卷 819-825页

作者： xuxiangde DINGGuoan ZHOULi ZHENGXiangdong BIANLingen QIUJinheng YANGLiquan MAOJietai ChineseAcademyofMeteorologicalSciences Beijing100081China InstituteofAtmosphericPhysics ChineseAcademyofSciencesBeijing100029China DepartmentofAtmosphericSciences PekingUniversityBeijing100871China

The Beijing City Air Pollution Observation Field Experiment (BECAPEX) is described with emphases on the 損oint-surface?research approach and composite analysis. The analysis results of measurements from four observation sites across the Beijing urban area from January to March indicate that the overall impact of urban emission sources in the heating season is significant, and the staggered impact of urban emission sources has different features at observation sites over different parts of Beijing in both heat-ing and non-heating seasons. The pollutants NOx, SO2 and CO in the urban boundary layer have the in-phase variation features over a large area. O3 concentrations at different sites have the same variation trend but its change is reversed phases with above pollutants. The pollutants over the urban area in heating and non-heating seasons also have the syn-chronous variation trend. The comprehensive sounding of BECAPEX indicates that pollutants and aerosol vertical profiles are closely correlated to the vertical structure of the large-scale inversion layer in the urban boundary layer over the urban area. The localized 3D-structural features of local urban polluting processes associated with the peripheral areas are discussed with a 損oint-surface?comprehensive sounding technique.

关键词：空气污染北京卫星遥感技术污染监测环境保护

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Atmospheric hydrological budget with its effects over Tibetan Plateau

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Journal of Geographical Sciences 2004年第1期14卷 81-86页

作者： BAIJingyu xuxiangde ChineseAcademyofMeteorologicalSciences Beijing100081China NanjingInstituteofMeteorology Nanjing210044China

Based on 1961-2000 NCEP/NCAR monthly mean reanalysis datasets, vapor transfer and hydrological budget over the Tibetan Plateau are investigated. The Plateau is a vapor sink all the year round. In summer, vapor is convergent in lower levels (from surface to 500 hPa) and divergent in upper levels (from 400 to 300 hPa), with 450 hPa referred to as level of non-divergence. Two levels have different hydrologic budget signatures: the budget is negative at the upper levels from February to November, i.e., vapor transfers from the upper levels over the plateau; as to the lower, the negative (positive) budget occurs during the winter (summer) half year. Evidence also indicates that Tibetan Plateau is a 'vapor transition belt', vapor from the south and the west is transferred from lower to upper levels there in summer, which will affect surrounding regions, including eastern China, especially, the middle and lower reaches of the Yangtze. Vapor transfer exerts significant influence on precipitation in summertime months. Vapor transferred from the upper layers helps humidify eastern China, with coefficient -0.3 of the upper budget to the precipitation over the middle and lower reaches of the Yangtze (MLRY); also, vapor transferred from east side (27.5 o -32.5 o N) of the upper level has remarkable relationship with precipitation, the coefficient being 0.41. The convergence of the lower level vapor has great effects on the local precipitation over the plateau, with coefficient reaching 0.44, and the vapor passage affects the advance and retreat of the rainbelt. In general, atmospheric hydrologic budget and vapor transfer over the plateau have noticeable effects on precipitation of the target region as well as the ambient areas.

关键词： Tibetan Plateau atmospheric hydrologic budget vapor transfer rainfall

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