检索结果-南通市图书馆

Correlations between North Atlantic Oscillation Index in winter and eastern china Flood/Drought Index in summer in the last 53. years

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2005年第21期50卷 2505-2516页

作者： FU Congbin & ZENG Zhaomei key laboratory of regional {3.-environment for temperate east asia, Institute of Atmospheric Physics, chinese academy of sciences START regional Center for temperate east asia, Beijing 100029, {13. key laboratory of regional {3.-environment for temperate east asia Institute of Atmospheric Physics Chinese Academy of Sciences START Regional Center for Temperate East Asia Beijing 100029 China

The time series of winter North Atlantic Oscil-lation Index (NAOI) in the period of 1429-1983.developed by Glueck and summer Flood/Drought Index (FDI) of eastern china in the period of 1470-1999 from 100 stations are used in this paper to study the potential impact of North Atlantic Oscillation on the climate in china. The analysis has ex-plored some significant lag correlations between FDI and NAOI. The maximum positive correlation coefficients be-tween NAOI and area-mean FDI in eastern and northern china lagging 2-3.years reach at 0.001 significance level, and while there are also negative correlation between NAOI and FDI in central and southern china at significance level of 0.05-0.01. The correlation between FDI and NAOI is time-dependent, i.e. the correlation coefficients between two indices vary from period to period. The highest correlation appeared in the period of 163.-1742, around the Little Ice Age, with the significant level of far above 0.001. The second significant period was from 1951 to 1999, at the level of 0.005-0.002. Both the power spectrum analysis and Morlet wavelet transformation have presented an interesting phe-nomenon: the area-mean FDIs in eastern and northern china share almost the same oscillation periods with NAOI in the inter-annual, decadal and centurial scales’ oscillations, i.e. 4-5, about 10, 20-3., around 50 and 80-100 years, etc. The Mann-Kendall Rank Statistic test reveals the significant trend and decadal abrupt changes in the series of area-mean FDIs in eastern and northern china in the past 53. years, while the NAOI in the past 400 years, did not show such trend at the significance level, but presented more frequent changes than those of FDI in china. This difference is per-haps due to the fact that the amplitude of the extremes of reconstructed NAOI series is less than that from instrumen-tal records.

关键词：中国洪水干旱气候变化大西洋振动系数

Water-vapor source shift of Xinjiang region during the recent twenty years

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第5期17卷 569-575页

作者： Dai Xingang , Li Weijing , Ma Zhuguo and Wang Ping (key laboratory of regional {3.-environment for temperate east asia, Institute of Atmospheric Physics, chinese academy of sciences, Beijing 100029, china laboratory for {3. Change, chinese Meteorological Administration, Beijing 100081, china) [a]key laboratory of regional {3.-environment for temperate east asia Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing China [b]laboratory for climate Change chinese Meteorological Administration Beijing China

The aim of this paper is to investigate the climate water-vapor sources of Xinjiang region and their shifts during the past 20 years. First, the principle and steps are roughly regulated to seek the water-vapor sources. Second, the climate stationary water-vapor transport in troposphere is calculated to distinguish where the water vapor comes from by ERA-40 reanalysis. In addition, the collocation between the transport and the atmospheric column water vapor content is analyzed. The results show that the major vapor comes from the west side of Xinjiang for mid-month of seasons, apart from July while the water vapor comes from the north or northwest direction. The water vapor sources are different for different seasons, for example, the Caspian Sea and Mediterranean are the sources in January and April, the North Atlantic and the Arctic sea in July, and the Black Sea and Caspian Sea in October, respectively. In recent ten years more water vapor above Xinjiang comes from the high latitudes and the Arctic sea with global warming, and less from Mediterranean in comparison with the case of 1973.1986. In fact, the air over subtropics becomes dry and the anomalous water vapor transport direction turns to west or southwest during 1987—2000. By contrast, the air over middle and high latitudes is warmer and wetter than 14 years ago.

关键词： global warming water-vapor source water-vapor transport precipitable water Xinjiang climate inter-decadal change.

Modeling the climate effects of different subregional uplifts within the Himalaya-Tibetan Plateau on asian summer monsoon evolution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Science Bulletin 2012年第35期57卷 4617-4626页

作者： ZHANG Ran 1,JIANG DaBang 1,2,3.LIU XiaoDong 4 & TIAN ZhiPing 2,5 1 climate Change research Center,chinese academy of sciences,Beijing 100029,{3. 2 Nansen-Zhu International research Centre,Institute of Atmospheric Physics,chinese academy of sciences,Beijing 100029,{3. 3.key laboratory of regional climate-environment research for temperate east asia,chinese academy of sciences,Beijing 100029,{3. 4 State key laboratory of Loess and Quaternary Geology,Institute of Earth environment,chinese academy of sciences,Xi’an 710075,{3. 5 Graduate University of chinese academy of sciences,Beijing 100049,{3. 1. climate Change research Center Chinese Academy of Sciences Beijing 100029 China 2. Nansen-Zhu International research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 3. key laboratory of regional {3.-environment research for temperate east asia Chinese Academy of Sciences Beijing 100029 China 4. State key laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi’an 710075 China 5. Graduate University of chinese academy of sciences Beijing 100049 China

Considering the different uplifting time of different subregions of the Himalaya-Tibetan Plateau(TP),a series of numerical simulations have been conducted with the Community Atmosphere Model(CAM4) developed at the National Center for Atmospheric research to explore the effects of the phased tectonic uplift of the Himalaya-TP on the evolution of asian summer *** results show that the uplifts of the Himalaya and northern TP significantly affect the evolutions of South asian summer monsoon and northern {3. asian summer monsoon *** is,the tectonic uplift of the Himalaya intensifies the South asian summer monsoon circulation and increases the precipitation in South asia,whereas the uplift of the northern TP intensifies the northern {3. asian summer monsoon circulation and increases the precipitation in northern {3. *** with previous simulations,current comparative analyses of modeling results for different subregional uplifts within the Himalaya-TP help deepen our understanding of the evolutionary history of asian monsoons.

关键词：青藏高原隆升喜马拉雅亚洲季风高原气候夏季季风次区域隆起演化建模

regional soil moisture simulation for Shaanxi Province using SWAT model validation and trend analysis

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2010年第4期53卷 575-590页

作者： LI MingXing1,2,MA ZhuGuo1 & DU JiWen3.1 key laboratory of regional {3.-environment research for temperate east asia,Institute of Atmospheric Physics,chinese academy of sciences,Beijing 100029,china 2 Graduate University of chinese academy of sciences,Beijing 100049,china 3.Shaanxi Administration of Meteorology,Xi’an 710014,china 1. key laboratory of regional {3.-environment research for temperate east asia Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Shaanxi Administration of Meteorology Xi’an 710014 China

The soil moisture in Shaanxi Province,a region with complex topography,is simulated using the distributed hydrological model Soil Water Assessment Tool(SWAT).Comparison and contrast of modeled and observed soil moisture show that the SWAT model can reasonably simulate the long-term trend in soil moisture and the spatiotemporal variability of soil moisture in the *** to NCEP/NCAR and ERA40 reanalysis of soil moisture show that the trend of variability in soil moisture simulated by SWAT is more consistent with the *** model results suggested that high soil moisture in surface soil layers appears in the southern Shaanxi with high vegetation cover,and the Qinling mountainous region with frequent orographic *** deeper soil layers,high soil moisture appears in the river basins and *** regional soil moisture showed a generally decreasing trend on all soil layers from 1951 to 2004,with a stronger and significant decreasing trend in deeper soil layers,especially in the northern parts of the province.

关键词： SWAT soil moisture content simulation validation trend analysis

Some evidence of drying trend over northern china from 1951 to 2004

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2006年第23期51卷 2913-2925页

作者： MA Zhuguo1,2 & FU Congbin1,2 1. key laboratory of regional {3.-environment for temperate east asia, chinese academy of sciences, Beijing 100029, china 2. START regional Center for temperate east asia, Institute of Atmos-pheric Physics, chinese academy of sciences, Beijing 100029, china key laboratory of regional {3.-environment for temperate east asia Chinese Academy of Sciences Beijing 100029 China START regional Center for temperate east {3. Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The surface wetness index, Palmer drought sererity index and the retrieval of soil moisture over china were calculated using monthly precipitation and monthly mean surface air temperature. Based on the contrast analysis of the variation of the above three indices and precipitation, the dry/wet spatio-temporal pattern of northern china in the last 54 years was revealed, and the evidence of drying trend over northern china was analyzed, especially. The results show the following four facts: (1) The drying trend is the main characteristic of the {3.ern part of Northwest china and the central part of North china since the 1980s and it was enhanced in the last 15 years mainly due to the precipitation decrease and the temperature increase; (2) During the last 54 years, there was only one dry/wet shift at the interdecadal scale occurring in the {3.ern part of Northwest china and the central part of North china in the late 1970s, which was related to 1977/1978 global abrupt change, whereas there were three shifts in North{3. china, one was in the mid 1990s and the other two were in 1965 and 1983. respectively; (3. Unlike the variation trend of other subregions of northern china, the western part of Northwest china is currently located in a relatively wetting period, which is weak-ened due to the temperature increase; (4) The extreme drought frequency is obviously increasing in the {3.ern part of Northwest china, the central part of North china and North{3. china since the 1980s, which is closely related to the precipitation decrease and temperature increase in these subregions.

关键词：中国北方干燥趋向干旱索引气候背景

Spatial patterns of ecosystem carbon residence time in chinese forests

在线全文

学校读者我要写书评

暂无评论

中国科学：地球科学英文版 2010年第8期53卷 1229-1240页

作者： ZHOU Tao1,2, SHI PeiJun1,2, JIA GenSuo3. LI XiuJuan1,2 & LUO YiQi4 1 State key laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, china 2 {3. of Disaster Reduction and Emergency Management, Ministry of Civil Affairs & Ministry of Education, Beijing 100875, china 3.key laboratory of regional climate-environment research for temperate east asia, chinese academy of sciences, Beijing 100029, china 4 Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73.19, USA 1. State key laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China2. Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs & Ministry of Education Beijing 100875 China3. Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Chinese Academy of Sciences Beijing 100029 China4. Department of Botany and Microbiology University of Oklahoma Norman OK 73019 USA

Capacity of carbon sequestration in forest ecosystem largely depends on the trend of net primary production (NPP) and the length of ecosystem carbon residence time. Retrieving spatial patterns of ecosystem carbon residence time is important and necessary for accurately predicting regional carbon cycles in the future. In this study, a data-model fusion method that combined a process-based regional carbon model (TECO-R) with various ground-based ecosystem observations (NPP, biomass, and soil organic carbon) and auxiliary data sets (NDVI, meteorological data, and maps of vegetation and soil texture) was applied to estimate spatial patterns of ecosystem carbon residence time in chinese forests at steady state. In the data-model fusion, the genetic algorithm was used to estimate the optimal model parameters related with the ecosystem carbon residence time by minimizing total deviation between modeled and observed values. The results indicated that data-model fusion technology could effectively retrieve model parameters and simulate carbon cycling processes for chinese forest ecosystems. The estimated carbon residence times were highly heterogenous over china, with most of regions having values between 24 and 70 years. The deciduous needleleaf forest and the evergreen needleleaf forest had the highest averaged carbon residence times (73.8 and 71.3.years, respectively), the mixed forest and the deciduous broadleaf forest had moderate values (3..1 and 3..3.years, respectively), and the evergreen broadleaf forest had the lowest value (3..7 years). The averaged carbon residence time of forest ecosystems in china was 57.8 years.

关键词： carbon residence time carbon cycle forest ecosystem data-model fusion inverse modeling genetic algorithm

Interannual variability of Antarctic Oscillation and its influence on east asian climate during boreal winter and spring

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第5期49卷 554-560页

作者： FAN Ke1,2,3.& WANG Huijun2 1. Nansen-Zhu International research Center, Institute of Atmospheric Physics, chinese academy of sciences, Beijing 100029, china 2. Department of Atmospheric Science, Yunnan University, Kunming 650091, china 3. Graduate University of the chinese academy of sciences, Beijing 100049, china 1. Nansen-Zhu International research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Department of Atmospheric Science Yunnan University Kunming 650091 China 3. Graduate University of the chinese academy of sciences Beijing 100049 China

The interannual variability of Antarctic Oscillation (AAO) and its influence on east asian climate during both boreal winter and spring are addressed. The results show that the positive AAO anomaly decreases the cold activity over east asia during both boreal winter and spring. AAO-related barotropic meridional teleconnection from Antarctic to Arctic is found through analysis of mean me- ridional circulations. This meridional teleconnection is remarkable over Eurasia during boreal winter and over the Pacific Ocean during boreal spring. The results also show that zonal mean zonal wind at high latitudes in Southern Hemisphere has well positive correlation with that of Eurasia during boreal winter and has negative correlation with Pacific North American teleconnection (PNA) during boreal spring, which again display the meridional teleconnection. Thus, local meridional teleconnection is a possible linkage for interaction of circulations at mid-high latitudes between both hemispheres.

关键词： Antarctic Oscillation, Eurasian west wind, meridional teleconnection, mean meridional circulation.

Forcing mechanism of the Pleistocene east asian monsoon variations in a phase perspective

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第10期48卷 1708-1717页

作者： TIAN Jun1,2, WANG Pinxian1, CHENG Xinrong1, WANG Rujian1 & SUN Xiangjun1,3.1. State key laboratory of Marine Geology, Tongji University, Shanghai 200092, china 2. Institute of Geology and Geophysics, {3., Beijing 100029, china 3. Institute of Botany, {3., Beijing 100093. china State key laboratory of Marine Geology Tongji University Shanghai china Institute of Geology and Geophysics chinese academy of sciences Beijing china Institute of Botany chinese academy of sciences Beijing china

The deep sea records from the ODP Sites 1143.and 1144 in the northern and southern South china Sea (SCS), including foraminiferal δ 18O and δ 13., Opal% and pollen percentage, reveal that the variations of the east asian monsoon have been closely correlated with the variations of the Earth’s orbital parameters (eccentricity, obliquity and precession) and the global ice volume on orbital scale. All the monsoonal proxies show strong 100 ka, 41 ka and 23.ka cycles. Although G. ruber δ 13. of Site 1143.is coherent with the ETP (ETP= normalized (eccentricity + obliquity-precession) at eccentricity, obliquity and precession bands, most of the coherent relationship focuses on the precession band, and the other monsoonal proxies are coherent with the ETP only at the precession band, which indicate that precession dominates the Pleistocene tropical {3. changes. The phase relationship of the monsoonal proxies with the foraminiferal δ 18O implies that the global ice volume changes have played a significant role in modulating the east asian monsoon {3., at least dominating the winter monsoon. This forcing mechanism of the east asian monsoon is apparently different from that of the Indian ocean mon-soon. The variations of the east asian monsoon at the precession band, at least that of the winter monsoon, have been controlled not only by the sensible heating but also by the latent heating of the surface water in the South china Sea.

关键词： South china Sea, ODP, east asian monsoon, orbital forcing, global ice volume.

Cosmogenic ^(21)Ne concentrations and exposure ages of summit bedrocks in the Grove Mountains,Antarctica

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2010年第4期53卷 518-521页

作者： KONG Ping1,2,DING Lin2,LAI QingZhou2 & HUANG FeiXin3.1 key laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics,chinese academy of sciences,Beijing 100029,{3. 2 key laboratory of Continental Collision and Plateau Uplift,Institute of Tibetan Plateau research,chinese academy of sciences,Beijing 100085,{3. 3.Institute of Mineral Resources research,{3. Metallurgical Geology Bureau,Beijing 100025,{3. 1. key laboratory of the Earth’s Deep Interior Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China2. Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China3. Institute of Mineral Resources Research China Metallurgical Geology Bureau Beijing 100025 China

Various sources of 21Ne and 22Ne exist in surface rocks:cosmogenic,in situ nucleogenic from internal U and Th,trapped crustal nucleogenic and trapped *** paper reports the first measurement,in china,of cosmogenic 21Ne and 22Ne in surface *** developed a unique sample pre-treatment procedure that effectively removed inclusions inside quartz grains,and thus maximally reduced nucleogenic contributions of 21Ne and ***-heating experiments show that concen-trations of cosmogenic 21Ne and 22Ne in summit bedrock samples R9202 and R9203.from Grove Mountains,Antarctica,are(3.83.0.87)×108 and(5.22±0.51)×108 atoms/g,*** corresponding minimum exposure ages are 2.2±0.5 and 3.0±0.3.*** indicates that the ice sheet in east Antarctica was uncovered the crest of Mount Harding,a typical nunatak in Grove Mountains,since at least mid-Pliocene.

关键词： 21Ne cosmogenic nuclide exposure age Antarctica Grove Mountains