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Relationships between δ ^(18)O in summer precipitation and temperature and moisture trajectories at Muztagata, western china

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Science china Earth Sciences 2006年第1期49卷 27-35页

作者： YU Wusheng1,2, YAO Tandong1,2, TIAN Lide1,2, LI Zhen2, SUN Weizhen2 & WANG Yu2 1. Laboratory of Environment and Process on Tibetan Plateau, institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, china 2. Key Laboratory of Cryosphere and Environment, Jointly Established by Cold and Arid Regions Environmental and Engi-neering Research institute and institute of Tibetan Plateau Research, Chinese Academy of Sciences and Chinese Academy of meteorological Sciences, china meteorological administration, CAS, Lanzhou 730000, china Laboratory of Environment and Process on Tibetan Plateau Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China Key Laboratory of Cryosphere and Environment Jointly Established by Cold and Arid Regions Environmental and Engineering Research Institute and Institute of Tibetan Plateau Research Chinese Academy of Sciences and Chinese Academy of Meteorological Sciences China Meteorological Administration Lanzhou China

Based on summer observations of stable isotope of precipitation at Muztagata, western china, during 2002―2003, this paper presents the relationship between δ 18O in precipitation and air temperature, and discusses the effect of moisture transport on δ 18O in precipitation. Results show that air temperature correlates positively with δ 18O in precipitation, and the temperature effect controls the δ 18O of precipitation in this area. The Muztagata region exhibits high δ 18O values in summer precipi-tation, similar to those shown at stations in adjacent regions. According to the results of our model set up to trace the moisture trajectories, the westerlies and local moisture circulation contribute to varia-tions of oxygen isotopes in precipitation. In addition, the impacts of the moisture transport distance, the moisture transport level, and the incursion of the polar air mass also influence the variations of δ 18O in precipitation. The moisture origins and transport mechanisms also contribute to the variation of δ 18O in precipitation at Muztagata.

关键词： Muztagata, δ18O, precipitation, temperature, moisture transport.

Study of statistically correcting model CMAQ-MOS for forecasting regional air quality

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Science china Earth Sciences 2005年第S2期48卷 155-172页

作者： XU Jianming, XU Xiangde, LIU Yu, DING Guoan, CHEN Huailiang, HU Jiangkai, ZHANG Jianchun, WU Hao, LI Weiliang, HE Jinhai, YANG Yuanqin & WANG Jiahe Nanjing University of Information Science & Technology, Nanjing 210044, china State Key Laboratory of Severe Weather, Chinese Academy of meteorological Sciences, Beijing 100081, china meteorological Bureau of Henan Province, institute of meteorological Sciences, Zhengzhou 450000, china National meteorological Centre of china meteorological administration, Beijing 100081, china National meteorological Information Centre of china meteorological administration, Beijing 100081, china Nanjing University of Information Science & Technology Nanjing 210044 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China meteorological Bureau of Henan Province Institute of Meteorological Sciences Zhengzhou 450000 China National meteorological Centre of china meteorological administration Beijing 100081 China National meteorological Information Centre of china meteorological administration Beijing 100081 China

Based on analysis of the air pollution observational data at 8 observation sites in Beijing including outer suburbs during the period from September 2004 to March 2005, this paper reveals synchronal and in-phase characteristics in the spatial and temporal variation of air pollutants on a city-proper scale at deferent sites; describes seasonal differences of the pollutant emission influence between the heating and non-heating periods, also significantly local differences of the pollutant emission influence between the urban district and outer suburbs, i.e. the spatial and temporal distribution of air pollutant is closely related with that of the pollutant emission intensity. This study shows that due to complexity of the spatial and temporal distribution of pollution emission sources, the new generation Community Multi-scale Air Quality (CMAQ) model developed by the EPA of USA produced forecasts, as other models did, with a systematic error of significantly lower than observations, albeit the model has better capability than previous models had in predicting the spatial distribution and variation tendency of multi-sort pollutants. The reason might be that the CMAQ adopts average amount of pollutant emission inventory, so that the model is difficult to objectively and finely describe the distribution and variation of pollution emission sources intensity on different spatial and temporal scales in the areas, in which the pollution is to be forecast. In order to correct the systematic prediction error resulting from the average pollutant emission inventory in CMAQ, this study proposes a new way of combining dynamics and statistics and establishes a statistically correcting model CMAQ-MOS for forecasts of regional air quality by utilizing the relationship of CMAQ outputs with corresponding observations, and tests the forecast capability. The investigation of experiments presents that CMAQ-MOS reduces the systematic errors of CMAQ because of the uncertainty of pollution e

关键词： CMAQ-MOS point-area combination emission source influence emission inventory air quality.

Research and application on the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning

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Science china Earth Sciences 2005年第Z2期48卷 173-184页

作者： WANG Guangtao, WANG Xiaoyun, MIAO Shiguang, JIANG Weimei, GUO Wenli, JI Chongping & CHEN Xianyan School of Architecture, Tsinghua University, Beijing 100084, china Ministry of Construction of china, Beijing 100044, china Beijing meteorological Bureau, Beijing 100089, china institute of Urban meteorology, china meteorological administration, Beijing 100089, china Department of Atmospheric Sciences, Nanjing University, Nanjing 210093, china School of Architecture Tsinghua University Beijing 100084 China Ministry of Construction of china Beijing 100044 China School of Architecture Tsinghua University Beijing 100084 China Beijing meteorological Bureau Beijing 100089 China institute of Urban meteorology China Meteorological Administration Beijing 100089 China Department of Atmospheric Sciences Nanjing University Nanjing 210093 China Beijing meteorological Bureau Beijing 100089 China

Improvement of the atmospheric environment in urban planning is an important issue to implement the sustainable development of cities. In this paper, in order to meet the demand of planning office to compare and assess quantitatively of the designs in multi-scale, based on geographical information system (GIS) data with high resolution, a multi-scale numerical modeling system for the atmospheric environment impact of urban planning is set up, and the multi-scale assessment index system is established, which compose the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning. In urban planning (urban development of Beijing) and optimizing layouts of Olympic Green, it has been applied to quantitatively evaluating the impact on atmospheric environment by urban planning before construction, which offers scientific foundation to optimize the whole and local urban layout.

关键词： urban planning, atmospheric environment, multi-scale, numerical simulation, assessment index system.

Grain size record of microparticles in the Muztagata ice core

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Science china Earth Sciences 2006年第1期49卷 10-17页

作者： WU Guangjian1,2, YAO Tandong1,2, XU Baiqin1,2, LI Zheng2, TIAN Lide1,2, DUAN Keqin2 & WEN Linke2 1. Laboratory of Environment and Process on Tibetan Plateau, institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, china 2. Key Laboratory of Cryosphere and Environment, Jointly Established by Cold and Arid Regions Environmental and Engi-neering Research institute and institute of Tibetan Plateau Research, Chinese Academy of Sciences and Chinese Academy of meteorological Sciences, china meteorological administration, Lanzhou 730000, china Laboratory of Environment and Process on Tibetan Plateau Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China Key Laboratory of Cryosphere and Environment Jointly Established by Cold and Arid Regions Environmental and Engineering Research Institute and Institute of Tibetan Plateau Research Chinese Academy of Sciences and Chinese Academy of Meteorological Sciences China Meteorological Administration Lanzhou China

The dust transport and sediment characteristics are discussed based onanalysis of mi-croparticle size and size distribution in the Muztagata ice core at 6350 m a.s.I. Thefiner particles with diameter of 1—5 μm are the dominant fraction in number, while middle andcoarse particles mainly contribute to the total volume. The lognormal distribution characteristicscan be seen for some high concentration samples, showing that model size and standard variation aregreater than that in the Greenland ice cores. However, size-volume distribution of some lowconcentration samples is abnormal. Those distributions reflect the dust deposit process in highmountain glaciers at mid-low latitudes and show differences from those in polar ice sheet.

关键词： Muztagata, ice core, microparticle, dust, size distribution.

正则化方法同化多普勒天气雷达资料及对降雨预报的影响

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物理学报 2011年第7期60卷 875-886页

作者：赵延来黄思训杜华栋仲跻芹中国人民解放军理工大学气象学院南京211101 中国气象局北京城市气象研究所北京100089

基于三维变分同化(3DVAR)的思想,提出一种适用于多普勒天气雷达资料直接同化的正则化方法.从寻求Yo=H(X)带有偏差δ的极小模解出发,引入正则化思想,并给出与3DVAR方案不同的新代价函数.针对2008年8月14日发生在北京地区的一次局地暴雨过... 详细信息

基于三维变分同化(3DVAR)的思想,提出一种适用于多普勒天气雷达资料直接同化的正则化方法.从寻求Yo=H(X)带有偏差δ的极小模解出发,引入正则化思想,并给出与3DVAR方案不同的新代价函数.针对2008年8月14日发生在北京地区的一次局地暴雨过程,设计了一组数值试验,并采用L曲线准则后验选取最优正则化参数.数值结果表明:正则化方法和3DVAR方案均能有效同化多普勒雷达资料,雷达径向速度的同化效果明显好于反射率因子;正则化参数取值越小,分析场增量越明显,同化进入初始场的中小尺度信息越多,分析场与观测场越接近;同化得到的分析场,能够在一定程度上缩短模式起转调整时间,提高短期降雨预报的准确率,其中最优选取正则化参数的同化试验能够延长雷达资料同化时效,进一步改善降雨预报效果,合理雨区雨带分布,相应得到的TS评分也更高.

关键词：多普勒雷达资料正则化 3DVAR 降雨预报

Dominant climate factors influencing the Arctic runoff and association between the Arctic runoff and sea ice

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Acta Oceanologica Sinica 2010年第5期29卷 10-20页

作者： LI Pixue ZHANG Zhanhai LIU Jiping Ocean University of china Qingdao 266100 China Polar Research institute of china Shanghai 200136 China State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Shanghai Marine Environmental Monitoring and Forecasting Center Shanghai 200232 China

By using the Arctic runoff data from R-ArcticNET V4.0 and ArcticRIMS,trends of four major rivers flowing into the Arctic Ocean,whose climate factor plays an important role in determining the variability of the Arctic runoff,are *** results show that for the past 30 years,the trend of the Arctic runoff is seasonally *** is a significant trend in spring and winter and a significant decreasing trend in summer,leading to the reduced seasonal *** spring,surface air temperature is the dominant factor influencing the four *** summer,precipitation is the most important factor for Lena and Mackenzie,while snow cover is the most important factor for Yenisei and *** Mackenzie,atmospheric circulation does play an important role for all the seasons,which is not the case for the Eurasian *** authors further discuss the relationships between the Arctic runoff and sea *** negative correlation is found at the mouth of the rivers into the Arctic Ocean in spring,while significant positive correlation is observed just at the north of the mouths of the rivers into the Arctic in *** addition,each river has different relationship with sea ice in the eastern Greenland Sea.

关键词： Arctic runoff multiple linear regressions sea ice

Trends analysis for temperature in the JRB

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Trends analysis for temperature in the JRB

Analysis on a Cold Wave Weather Process in Winter in Gansu

强化科技基础推进气象现代化——第29届中国气象学会年会

作者： Shunjiu Wang a,Xinli Zhang b a institute of Plateau meteorology,china meteorological administration,Chengdu 610072,PR china b Business School,Sichuan University,Chengdu 610065,PR china

On the basis of the mean annual and seasonal temperature from 30 meteorological stations in the Jinsha River Basin(JRB) from 1961 to 2008,the temperature trends are analyzed by using Mann-Kendall(MK) test and linear trend *** is an increasing trend in mean annual and seasonal temperature in the JRB for the period of 1961-2008,and the increasing trends in winter seem more significant than those in the other three *** mean annual temperature has increased by 0.0158℃/yr during the last 48 *** are more than 70% of stations exhibiting increasing trends for annual and seasonal *** increasing trends in the river source and upper reaches are more dominant than those in the middle and lower *** largest increase magnitude occurred in the low temperature area,and the largest decrease magnitude occurred in the high temperature *** decreasing trends are mainly characterized for the maximum temperature time series,and summer is the only season showing a slight and insignificant increasing *** the time series showed a statistically significant increasing trend at the level of α=0.05 for the minimum temperature time *** a whole,the increasing magnitude of the minimum temperature is significantly greater than the decreasing magnitude of the maximum temperature.

关键词： Climate change Temperature Mann-Kendall test Trend The Jinsha River Basin

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meteorological and Environmental Research 2011年第11期2卷 25-28页

作者： SUN Yu-lian 1,2,ZHANG Shu-fang 2,ZHANG Li-lu 3,HUANG Cheng-xiu 2,HE Yu-chun 2 1.Lanzhou institute of Arid meteorology,china meteorological administration,Lanzhou 730020,china 2.Linxia meteorological Bureau in Gansu,Linxia 731100,china 3.Yongjing meteorological Bureau in Linxia of Gansu,Yongjing 731600,china

[Objective]The research aimed to analyze a cold wave weather process in winter in Gansu.[Method] Based on routine observation data and numerical forecast products,formation reason and physical quantity characteristics of a cold wave process during 2-5 December,2008 were comprehensively analyzed by synoptic analysis and diagnostic analysis methods.[Result]The cold wave weather belonged to ' translot turning vertical type'.Collapse of the Urals ridge,turning vertical of the translot and strengthening south of the ground cold high induced the cold *** of the Siberian low vortex drove the small branch of cold air in polar region supplementing south,playing certain promoting role in outbreak of the cold *** quantities in the cold wave process also had very good expression,such as vorticity,temperature advection,etc.[Conclusion]This research had important indication effect for early warning,forecast and decision service of the future similar weather process.

关键词： Cold wave Physical quantity characteristics Formation reason Gansu china

特克斯河流域近236a降水变化及其趋势预测

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山地学报 2010年第5期28卷 545-551页

作者：陈峰袁玉江魏文寿喻树龙范子昂张瑞波张同文尚华明中国气象局乌鲁木齐沙漠气象研究所中国气象局树木年轮理化研究重点实验室新疆维吾尔自治区树木年轮生态重点实验室

根据2006年采自特克斯河流域6个采样点的树轮样本研制的树轮宽度年表与气象资料,通过相关普查发现,特克斯河流域树轮标准化年表与上年7月至当年6月的降水存在显著的正相关,最高单相关系数为0.727。用库尔克尔也灭,小白代的树轮宽度标准... 详细信息

根据2006年采自特克斯河流域6个采样点的树轮样本研制的树轮宽度年表与气象资料,通过相关普查发现,特克斯河流域树轮标准化年表与上年7月至当年6月的降水存在显著的正相关,最高单相关系数为0.727。用库尔克尔也灭,小白代的树轮宽度标准化年表序列,可较好地重建该地区最近236a的降水序列,方差解释量达54%,并通过交叉检验表明重建结果是稳定可靠的。近236a,特克斯河流域上年7月至当年6月降水经历了8个偏湿阶段和8个偏干阶段,同时重建降水序列具有10.3a、7.5a、6.0a、3.0a、2.1a的变化准周期,并在1790年,1911年,1929年,1974年发生过降水突变。采用毛毛虫-奇异谱分析法(Caterpillar-ssa)对该地区未来20a的降水的自然变化进行预测。结果表明,21世纪的最初几年降水量将延续20世纪90年代以来增加的趋势,之后出现下降,并在2013~2016年前后最低值出现。

关键词：特克斯河流域树轮年表降水变化趋势预测