Tandong Yao

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (282)591.13 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Investigation of temporal variations in the stable δ 18O and δD isotopes from Kathmandu’s precipitation events shows that the relatively enriched δ 18O and δD values in the winter (the dry season, dominated by the westerlies) were positively correlated with temperature, indicating a temperature effect controlling the changes of δ 18O and δD. However, the δ 18O and δD values were depleted in the summer (the wet season, dominated by the Indian monsoon), which were negatively correlated with precipitation amount, indicating an amount effect. In addition, the comparison of stable isotopes in precipitation from Kathmandu and Mawlong (near the Bay of Bengal) shows that the overall trends of δ 18O and δD values at Kathmandu generally approximate those at Mawlong. However, there remain many differences between the details of the isotopic changes at Kathmandu versus those at Mawlong. Compared with those at Mawlong, the further rainout effect and the more intense lift effect of the oceanic moisture by the high mountains resulted in the more depleted δ 18O and δD values in summer precipitation at Kathmandu. A deuterium excess and the local meteoric water lines reveal that evaporation at Kathmandu exceeds that at Mawlong. The data also show that the Indian monsoon activities at Mawlong are more intense than those at Kathmandu.
    Chinese Science Bulletin 12/2014; 59(34). · 1.37 Impact Factor
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    ABSTRACT: A Gram-negative, rod-shaped, non-flagellum bacterium MJ9-5T was isolated from ice core of Muji Glacier. Colonies of MJ9-5T were pink, convex and round on R2A plates. Strain MJ9-5T grows between -1 to 25 °C with an optimum temperature of 10-15 °C. MJ9-5T tolerates 0-1.2 % (NaCl, w/v) with an optimum of 1%. The major cellular fatty acids of the strain were iso-C15:0, Summed Feature 3 (C16:1ω6c and/or C16:1ω7c) and iso-C17:0 3-OH. The G+C content of the genomic DNA was 38.5 mol%. Phylogenetic analysis based on 16S rRNA gene similarity showed that strain MJ9-5T was related to the members of the genus Arcticibacter. On the basis of the phenotypic characteristics and phylogenetic analysis, a novel species Arcticibacter eurypsychrophilus sp. nov. type strain MJ9-5T (=KCTC42008T =JCM19862T) is proposed. Copyright © 2014, the Society for General Microbiology.
    International journal of systematic and evolutionary microbiology. 11/2014;
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    ABSTRACT: The phylogenetic diversity of picocyanobacteria in seven alkaline lakes on the Tibetan Plateau was analyzed using the molecular marker 16S-23S rRNA internal transcribed spacer sequence. A total of 1077 environmental sequences retrieved from the seven lakes were grouped into seven picocyanobacterial clusters, with two clusters newly described here. Each of the lakes was dominated by only one or two clusters while different lakes may have disparate communities, suggesting low alpha-diversity but high beta-diversity of picocyanobacteria in these high altitude freshwater and saline lakes. Several globally distributed clusters were found in these Tibetan lakes, such as the Subalpine cluster I and Cyanobium gracile cluster. Although other clusters likely exhibit geographic restriction to the Plateau temporally, reflecting endemism, they can indeed distribute widely on the Plateau. Lakes with similar salinities may have similar genetic populations despite of their large geographic distance. Canonical Correspondence Analysis identified salinity to be the only environmental factor that may in part explain the diversity variations among lakes. Mantel tests suggested that the community similarities among lakes are independent of geographic distance. A part of the picocyanobacterial clusters appear to be restricted to a narrow salinity range while others are likely adapted to a broad range. A seasonal survey across three years of Lake Namucuo did not show season-related variations in diversity and a depth-related population partitioning was observed along a vertical profile of the lake. Our study emphasizes the high dispersive potential of picocyanobacteria and suggests that the regional distribution may result from adaptation to specified environments.
    Applied and Environmental Microbiology 10/2014; · 3.95 Impact Factor
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    ABSTRACT: Understanding the changes in number and areal extent of lakes, as well as their abundance and size distribution is important for assessments of regional and global water resources, biogeochemical cycles, and changes in climate. In this study, changes in lake area greater than 1 km2 are mapped using Landsat datasets, spanning the 1970s, 1990, 2000, and 2010. In addition, high-resolution images (GeoCover Landsat mosaic 2000, with a pixel size of 14.25 m) are used for the first time to map lakes as small as 0.001 km2 across the entire Tibetan Plateau (TP). Results show that the numbers and areal extent of individual lakes >1 km2 in size show a slight decrease between the 1970s and 1990, followed by a clear increase from 1990 to 2010. Ninety-nine new lakes are identified between the 1970s and 2010, 71 of which are found between 1990 and 2010. This indicates the accelerated glacier melt and/or increased difference of precipitation minus evaporation since the 1990s. More than 80 % of the lakes show an increase in their area between the 1970s and 2010. The lake census, using 2000 imagery, shows that there are 32,843 lakes with a total area of 43,151.08 ± 411.49 km2, which makes up 1.4 % of the total area of the TP. Around 96 % of all lakes are small, with an area <1 km2, while the 1,204 large lakes (>1 km2) account for 96 % of the total lake area. The TP is subdivided into 12 greater drainage basins, and of these the inner TP dominates in terms of the number of lakes (55.03 %), the total area of lakes (66 %), and lake density (0.026/km2 compared to the mean, 0.011/km2). A plot of lake abundance against size shows that the size distribution of lakes departs from a typical power-law distribution, but displays such a distribution at the mean elevation (4,715 m), with an r 2 value of 0.97 and a slope of −0.66. The slopes of the abundance-size equations from each of the 12 greater basins, and from all basins together, are larger than −1, supporting the inference that larger lakes, rather than the small lakes, contribute more to the total lake surface area across the TP. The lake inventory provided in this study, along with the assessment of lake size distribution, have important implications for estimates of water balance, for water resource management, and for lake area estimations in the TP.
    Chinese Science Bulletin 08/2014; 59(24). · 1.37 Impact Factor
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    ABSTRACT: Dyadobacter tibetensis Y620-1 is the type strain of the species Dyadobacter tibetensis, isolated from ice at a depth of 59 m from a high altitude glacier in China (5670 m above sea level). It is psychrotolerant with growth temperature ranges of 4 to 35°C. Here we describe the features of this organism, together with the draft genome sequence and annotation. The 5,313,963 bp long genome contains 4,828 protein-coding genes and 39 RNA genes. To the best of our knowledge, this is the first Dyadobacter strain that was isolated from glacial ice. This study provides genetic information of this organism to identify the genes linked to its specific mechanisms for adaption to extreme glacial environment.
    Standards in Genomic Sciences 06/2014; 9(3):883-92. · 3.17 Impact Factor
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    ABSTRACT: Temperature changes over the Tibetan Plateau (TP) exhibit a dependence on altitude, as observed from meteorological station data and Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature (LST) data. However, little is known about the changes in water surface temperature (WST) of lakes in the TP under the warming climate conditions over the past few decades. In this study, lake WST was examined using a MODIS/Terra 8-day LST (nighttime) product (MOD11A2) over the period 2001 − 2012. It was found that 52 lakes included in the analysis of WST exhibited an average rate of change of 0.012 ± 0.033 °C/year. Of these 52 lakes, 31 lakes (60%) displayed a temperature increase with a mean warming rate of 0.055 ± 0.033 °C/year and 21 lakes (40%) displayed a temperature decrease with a mean cooling rate of −0.053 ± 0.038 °C/year. The rates of change in WST for 13 lakes were statistically significant, and these included 9 warming and 4 cooling lakes. Of the 17 lakes with nearby weather stations, 9 lakes (53%) showed faster warming than nearby air/land. The warming lakes could be attributed to locally rising air and land surface temperatures as well as other factors such as the decreased lake ice cover. The cooling lakes were mostly located at high elevations (>4,200 m), and the trend could have been due to increased cold water discharge to the lakes from accelerated glacier/snow melts. Therefore, both warming and cooling lake temperatures in the TP were possibly the result of increased air temperatures (0.036 ± 0.027 °C/year) under global warming conditions.
    Journal of Geophysical Research: Atmospheres. 06/2014;
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    ABSTRACT: Temperature signals in ice-core δ18O on the Tibetan Plateau (TP), particularly in the central and southern parts, continue to be debated because of the large scale of atmospheric circulation. This study presents ten ice-core δ18O records at an annual resolution, with four (Malan, Muztagata, Guliya, and Dunde) in the northern, three (Puruogangri, Geladaindong, Tanggula) in the central and three (Noijin Kangsang, Dasuopu, East Rongbuk) in the southern TP. Integration shows commonly increasing trends in δ18O in the past century, featuring the largest one in the northern, a moderate one in the central and the smallest one in the southern TP, which are all consistent with ground-based measurements of temperature. The influence of atmospheric circulation on isotopic signals in the past century was discussed through the analysis of El Niño/Southern Oscillation (ENSO), and of possible connections between sea surface temperature (SST) and the different increasing trends in both ice-core δ18O and temperature. Particularly, El Niño and the corresponding warm Bay of Bengal (BOB) SST enhance the TP ice-core isotopic enrichment, while La Niña, or corresponding cold BOB SST, causes depletion. This thus suggests a potential for reconstructing the ENSO history from the TP ice-core δ18O.
    Quaternary Research 05/2014; · 2.58 Impact Factor
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    ABSTRACT: δ18O variability in daily precipitation at two stations (Lanzhou and Zhangye) north of the Qinling Mountains at the eastern margin of the Tibetan Plateau, China, and monthly precipitation δ18O at four stations to the south of the Qinling Mountains were examined. The data show that the δ18O composition of precipitation south of the Qinling Mountains is influenced strongly by the prevailing westerlies during winter and by the summer Asian monsoon during its most active periods. To the north, the westerlies prevail in winter, and δ18O trends coincide strongly with temperature. In summer, the Qinling Mountains block or weaken the Asian monsoon, which crosses them only during the most active periods. In these periods, the stations to the north experience relatively depleted δ18O values (<−7‰). During weak monsoon periods, however, most of the δ18O values in summer precipitation at Lanzhou and Zhangye are relatively enriched (>−5‰, and even as high as +9.2‰). A positive northward weighted average δ18O gradient of summer precipitation with increasing distance from the coast suggests the influence of the prevailing westerlies and of continental recycling of moisture. Both the frequency of these heavily depleted δ18O values and their duration decrease from south to north, reaching minimums at Zhangye, which may have been in the monsoonal tail region during the sampling period. The data reveal that the Qinling Mountains act as an important climatic divide along the eastern margin of the Tibetan Plateau. The effects of the Asian summer monsoon and of different moisture sources should be considered for paleoclimatic studies.
    International Journal of Climatology 05/2014; 34(6). · 3.40 Impact Factor
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    ABSTRACT: Glacial lake outburst floods are among the most serious natural hazards in the Himalayas. Such floods are of high scientific and political importance because they exert trans-boundary impacts on bordering countries. The preparation of an updated inventory of glacial lakes and the analysis of their evolution are an important first step in assessment of hazards from glacial lake outbursts. Here, we report the spatiotemporal developments of the glacial lakes in the Poiqu River basin, a trans-boundary basin in the Central Himalayas, from 1976 to 2010 based on multi-temporal Landsat images. Studied glacial lakes are classified as glacier-fed lakes and non-glacier-fed lakes according to their hydrologic connection to glacial watersheds. A total of 119 glacial lakes larger than 0.01 km2 with an overall surface area of 20.22 km2 (±10.8%) were mapped in 2010, with glacier-fed lakes being predominant in both number (69, 58.0%) and area (16.22 km2, 80.2%). We found that lakes connected to glacial watersheds (glacier-fed lakes) significantly expanded (122.1%) from 1976 to 2010, whereas lakes not connected to glacial watersheds (non-glacier-fed lakes) remained stable (+2.8%) during the same period. This contrast can be attributed to the impact of glaciers. Retreating glaciers not only supply meltwater to lakes but also leave space for them to expand. Compared with other regions of the Hindu Kush Himalayas (HKH), the lake area per glacier area in the Poiqu River basin was the highest. This observation might be attributed to the different climate regimes and glacier status along the HKH. The results presented in this study confirm the significant role of glacier retreat on the evolution of glacial lakes. Copyright © 2014 John Wiley & Sons, Ltd.
    Hydrological Processes 04/2014; · 2.50 Impact Factor
  • Yang Xiang, Yang Gao, Tandong Yao
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    ABSTRACT: The Poiqu River basin is a transboundary basin that is highly prone to glacial lake outburst floods. This basin is located in the middle of the Himalayas between China and Nepal. Fieldwork investigating nearby glaciers has indicated that glaciers in this region have ablated quickly in recent decades. A new glacier database for the Poiqu River basin was generated for the phases 1975, 2000, and 2010 using automatic classification and manual visual interpretation based on long time series Landsat data. In 2010, the Poiqu River basin had 124 glaciers with a total area of 203.4 ± 5.3 km2. Eleven glaciers have debris-covered tongues, with the debris covering a total area of 51.0 ± 1.5 km2. During the period of 1975–2000, the area change rates of all glaciers in the basin, clean ice and debris-covered parts were −0.45%/y, −0.71%/y and 0.96%/y, respectively. From 2000 to 2010, these area change rates were −0.82%/y, −1.24%/y and 0.73%/y, respectively. The number of glaciers and area change of clean ice within various size classes indicate that the large glaciers shrink into small glaciers and smaller glaciers retreated faster. The mean size of the glaciers in this basin is within the size class 1.0–5.0 km2. The area change rate for 1.0–5.0 km2 glaciers was similar to that of all glaciers in the Poiqu River basin. The altitude of the Region with the Fastest Change (RFC) uplifted from 5200 m to 5500 m, and the area change rate of glaciers in the RFC accelerated from −0.17 km2/y to −0.21 km2/y between the two periods, 1975 to 2000 and 2000 to 2010. Aspect analysis indicates that for a long time period, glaciers with southward aspects (including south, east, southeast and southwest) in the Poiqu River basin retreated faster than glaciers with northward aspects (including west, north, northeast and northwest). At the decade-scale, changes in areas of glaciers were more influenced by composition than aspect. Additionally, the retreat rate of the glaciers in the Poiqu River is in a state of accelerating ablation since 2000, despite elevation and aspect.
    Quaternary International 03/2014; · 2.13 Impact Factor
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    ABSTRACT: Lakes of the Tibetan Plateau lack direct anthropogenic influences, providing pristine high altitude (>4,000 m) sites to study microbial community structure. We collected samples from the pelagic, littoral, and riverine zones of Lake Bangongco, located on the western side of the Plateau, to characterize bacterial community composition and geochemistry in three distinct, but hydrologically connected aquatic environments during summer. Bacterial community composition differed significantly among zones, with communities changing from riverine zones dominated by Bacteroidetes to littoral and pelagic zones dominated by Gammaproteobacteria. Community composition was strongly related to the geochemical environment, particularly concentrations of major ions and total nitrogen. The dominance of Gammaproteobacteria in the pelagic zone contrasts with typical freshwater bacterial communities as well as other lakes on the Tibetan Plateau. This article is protected by copyright. All rights reserved.
    FEMS Microbiology Ecology 01/2014; · 3.56 Impact Factor
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    ABSTRACT: Sedimentological data and hydrogen isotopic measurements of leaf wax long-chain n -alkanes (δ Dwax) from an alpine lake sediment archive on the southeastern Tibetan Plateau (Paru Co) provide a Holocene perspective of Indian summer monsoon (ISM) activity. The sedimentological data reflect variations in lake level and erosion related to local ISM rainfall over the Paru Co catchment, whereas δ Dwax reflects integrated, synoptic-scale ISM dynamics. Our results indicate that maximum ISM rainfall occurred between 10.1 and ∼5.2 ka∼5.2 ka, during which time there were five century-scale high and low lake stands. After 5.2 ka, the ISM trended toward drier conditions to the present, with the exception of a pluvial event centered at 0.9 ka. The Paru Co results share similarities with paleoclimate records from across the Tibetan Plateau, suggesting millennial-scale ISM dynamics were expressed coherently. These millennial variations largely track gradual decreases in orbital insolation, the southward migration of the Intertropical Convergence Zone (ITCZ), decreasing zonal Pacific sea surface temperature (SST) gradients and cooling surface air temperatures on the Tibetan Plateau. Centennial ISM and lake-level variability at Paru Co closely track reconstructed surface air temperatures on the Tibetan Plateau, but may also reflect Indian Ocean Dipole events, particularly during the early Holocene when ENSO variability was attenuated. Variations in the latitude of the ITCZ during the early and late Holocene also appear to have exerted an influence on centennial ISM rainfall.
    Earth and Planetary Science Letters 01/2014; 399:92–102. · 4.72 Impact Factor
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    ABSTRACT: In order to provide more conclusive evidence of monsoon-driven transport of persistent organic pollutants (POPs) to the Tibetan Plateau (TP) and assess the potential influence of forests on the fate of these pollutants, passive air samplers were consecutively deployed during 2008-2011 on Sygera Mountain (3800 m-4400 m). Higher DDTs levels were observed in the monsoon season (20.5-57.4 pg m(-3)) than the non-monsoon season (9.2-27.4 pg m(-3)), which confirmed that the Indian monsoon plays a key role in driving the atmospheric transport of DDTs to the TP. The similar DDT isomer ratios to the South Asia further suggested that Sygera Mountain is likely a receptor region of Indian subcontinent. By comparing the difference in concentrations between forest and clearing sites, it was found that the forest canopy can reduce airborne DDTs by a factor of 2, indicating strong absorption of DDTs by the Tibetan forest.
    Environmental Pollution. 01/2014; 194:210–216.
  • Jing Gao, Tandong Yao, Daniel Joswiak
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    ABSTRACT: δ18O measurements based on systematic sampling and isotopic modeling have been adopted to study the controls of stable isotopes in lake water in two lake basins (lakes Yamdrok-tso and Puma Yum-tso) at two different elevations on the southern Tibetan Plateau. Temporally, δ18O values in precipitation and lake water display a seasonal fluctuation in both lakes. Spatially, δ18O values in the two lake basins increase by 10% from the termini of glaciers to the lake shores, by 1% from the lake shores to the lake center and by 0.4% from the water surface to depth in these lakes. The clear annual δ18O variations indicate that lake water mixes sufficiently in a short time. Model results show that glacial meltwater and surface lake-water temperature are not the dominant factors in the balance process of stable isotopes in lake water. Equilibrium δ18O values decrease by 0.8% for Yamdrok-tso lake and 0.6% for Puma Yum-tso lake when glacial meltwater contributions to these lakes shrink by 60%. δ18O ratios increase rapidly during the initial stages and take a longer time to approach the equilibrium value.
    Annals of Glaciology 01/2014; 55(66). · 1.87 Impact Factor
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    Quaternary International 11/2013; · 2.13 Impact Factor
  • Quaternary International 11/2013; · 2.13 Impact Factor
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    ABSTRACT: [1] The stable oxygen isotope ratio (δ18O) in precipitation is an integrated tracer of atmospheric processes worldwide. Since the 1990s, an intensive effort has been dedicated to studying precipitation isotopic composition at more than 20 stations in the Tibetan Plateau (TP) located at the convergence of air masses between the westerlies and Indian monsoon. In this paper, we establish a database of precipitation δ18O and use different models to evaluate the climatic controls of precipitation δ18O over the TP. The spatial and temporal patterns of precipitation δ18O and their relationships with temperature and precipitation reveal three distinct domains, respectively associated with the influence of the westerlies (northern TP), Indian monsoon (southern TP), and transition in between. Precipitation δ18O in the monsoon domain experiences an abrupt decrease in May and most depletion in August, attributable to the shifting moisture origin between Bay of Bengal (BOB) and southern Indian Ocean. High-resolution atmospheric models capture the spatial and temporal patterns of precipitation δ18O and their relationships with moisture transport from the westerlies and Indian monsoon. Only in the westerlies domain are atmospheric models able to represent the relationships between climate and precipitation δ18O. More significant temperature effect exists when either the westerlies or Indian monsoon is the sole dominant atmospheric process. The observed and simulated altitude-δ18O relationships strongly depend on the season and the domain (Indian monsoon or westerlies). Our results have crucial implications for the interpretation of paleoclimate records and for the application of atmospheric simulations to quantifying paleoclimate and paleo-elevation changes.
    Reviews of Geophysics. 11/2013;
  • Tellus B 10/2013; 65. · 3.20 Impact Factor
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    ABSTRACT: [1] Based on glaciometeorological measurements and mass balance stake records during the 5 year period of 2005–2010 on the southeast Tibetan Plateau, an energy-mass balance model was applied to study the surface mass balance of the Parlung No. 94 Glacier, as well as its response to regional climate conditions. The primary physical parameters involved in the model were locally calibrated by using relevant glaciometeorological data sets. The good agreement between the snowpack height/mass balance simulations and the in situ measurements available from a total of 12 monitoring stakes over this glacier confirmed the satisfactory performance of the energy-mass balance model. Results suggested that the recent state of the Parlung No. 94 Glacier was far removed from the “ideal” climatic regime leading to zero mass balance, with its annual mass balance of approximately −0.9 m water equivalent during 2005–2010. Climatic sensitivity experiments were also carried out to interpret the observed mass balance changes, and the experiments demonstrated that the maritime glaciers concerned herein were theoretically more vulnerable to ongoing climate warming on the Tibetan Plateau than potential changes in the amount of precipitation. A plausible causal explanation for the recent glacier shrinkage in this region was concerned with the increasing air temperature. Moreover, both the mass balance simulations and the field measurements indicated that the mass accumulation over this maritime glacier occurred primarily in the boreal spring. Such “spring-accumulation type” glaciers are presumed to be distributed mainly within a narrow wedge-shaped region along the Brahmaputra River. Climatic sensitivities of the glacier mass balance are also found to be closely linked to the regional precipitation seasonality that is simultaneously modulated by various atmospheric circulation patterns, such as the southern westerlies, the Bay of Bengal vortex in the spring season, and the Indian monsoon in the summer season.
    Journal of Geophysical Research: Atmospheres. 09/2013;
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    ABSTRACT: There are limited data on polycyclic aromatic hydrocarbons (PAHs) in both the atmosphere and soil of the Tibetan Plateau (TP). Concentrations of PAHs were therefore measured in 13 XAD resin-based passive air samplers and 41 surface (0-5 cm) soil samples across the TP. The average concentration of atmospheric PAHs was 5.55 ng/m(3), which was lower than that reported for other background areas, but higher than the Arctic. Concentrations in the soils fell in a wide range from 5.54 to 389 ng/g, with an average of 59.9 ng/g. Elevation was found to play an important role in determining the spatial distribution of soil PAHs. The air-soil exchange state showed that the soils of the TP will likely remain as a sink for high molecular weight PAHs, but may become a potential "secondary source" for low molecular weight PAHs.
    Environmental Pollution 09/2013; 184C:138-144. · 3.73 Impact Factor

Publication Stats

4k Citations
591.13 Total Impact Points

Institutions

  • 1620–2014
    • Chinese Academy of Sciences
      • • Laboratory of Tibetan Environment Changes and Land Surface Processes
      • • Institute of Tibetan Plateau Research
      • • Cold and Arid Regions Environmental and Engineering Research Institute
      Peping, Beijing, China
  • 2002–2013
    • Northeast Institute of Geography and Agroecology
      • • Laboratory of Tibetan Environment Changes and Land Surface Processes
      • • Institute of Tibetan Plateau Research
      • • Cold and Arid Regions Environmental and Engineering Research Institute
      Beijing, Beijing Shi, China
  • 2012
    • Beijing Jiaotong University
      Peping, Beijing, China
  • 2010
    • Tianjin Normal University
      Kao-lan-hsien, Gansu Sheng, China
  • 2009
    • Gansu Agricultural University
      Kao-lan-hsien, Gansu Sheng, China
  • 2008
    • Shanghai Jiao Tong University
      • School of Life Science and Biotechnology
      Shanghai, Shanghai Shi, China
  • 2005
    • Lanzhou University
      • School of Life Science
      Kao-lan-hsien, Gansu Sheng, China
  • 2004
    • Chinese Research Academy of Environmental Sciences
      Peping, Beijing, China
  • 1993–2001
    • Government of the People's Republic of China
      Peping, Beijing, China
  • 1620–1997
    • The Ohio State University
      • Byrd Polar Research Center
      Columbus, Ohio, United States