The Second Tibetan Plateau Scientific Expedition (STEP) program

Brief Introduction: Second Tibetan Plateau Scientific Expedition Program

Number of Datasets: 304

  • The 30-meter resolution product of suspended solids concentration in the water body of the Qinghai-Tibet Plateau (2018)

    The 30-meter resolution product of suspended solids concentration in the water body of the Qinghai-Tibet Plateau (2018)

    Data content: the data set product contains the 30-meter resolution product of suspended solids concentration in the water body of the Qinghai-Tibet Plateau, which can be used as the key parameters for ecosystem-related research in Qinghai-Tibet Plateau. Data sources and processing methods: Product inversion is mainly based on the Landsat series data, by extracting the effective aquatic reflectance, to obtain the water composition information. This product is the preliminary result of extracting the concentration information of suspended solids in water using the empirical / semi-empirical method. Data quality: the overall accuracy is high, and the product will be further optimized in combination with the measured data of scientific research. Results and prospects of data application: the data set will be continuously updated and can be used for the study and analysis of ecosystem change in the Qinghai-Tibet Plateau.

    2021-07-07 191 3

  • Analysis on the abnormal mechanical characteristics of static tension and dynamic impact of NPR anchor cable in laboratory (2019-2020)

    Analysis on the abnormal mechanical characteristics of static tension and dynamic impact of NPR anchor cable in laboratory (2019-2020)

    1) Data content: ① indoor static tension video, infrared monitoring video and static tension analysis data chart of giant NPR anchor cable; ② Indoor dynamic impact video of giant NPR anchor cable; 2) Data sources: the static tension process, infrared monitoring and dynamic impact process of indoor giant NPR anchor cable were recorded, and the static tension data were imported into Origin Software for data processing and analysis; 4) Through the indoor static tension and dynamic impact tests on the giant NPR anchor cable, the supernormal mechanical properties of the giant NPR anchor cable are obtained, which can provide supporting materials for the prevention and control of slope disasters in fault zone, early warning monitoring and cross fault tunnel prevention.

    2021-07-07 116 0

  • Normalized Difference Vegetation Index (NDVI) dataset of Tibetan Plateau (1982-2015)

    Normalized Difference Vegetation Index (NDVI) dataset of Tibetan Plateau (1982-2015)

    The data set is based on NDVI 3G calculated by GIMMS AVHRR sensor data, which represents the greenness of vegetation. The source data range is global, and the Qinghai Tibet plateau region is selected in this data set. This data integrates the original semi monthly scale data into the monthly data. The processing method is to take the maximum value of two NDVI of a month to achieve the effect of noise removal as far as possible. This data set is one of the most widely used NDVI data, and is often used to evaluate the temporal and spatial patterns of vegetation greenness, which has practical significance and theoretical value.

    2021-07-06 1771 328

  • Satellite remote sensing images (30m) of the Qinghai-Tibet Plateau (2018)

    Satellite remote sensing images (30m) of the Qinghai-Tibet Plateau (2018)

    The annual synthetic satellite remote sensing image collection of the Qinghai-Tibet Plateau is true color with a spatial resolution of about 30 meters. Inputting surface reflectance of Landsat satellite images, color balance and rapid automatic mosaic were performed to obtain a mosaic image of 30 meters in the Qinghai-Tibet Plateau. This dataset can provide 30m resolution satellite image base maps for the Qinghai-Tibet scientific research, and can also be used for interpretation and automatic extraction of land cover types.

    2021-07-06 273 19

  • Landsat surface temperature products over the Tibetan Plateau (1970s-2019)

    Landsat surface temperature products over the Tibetan Plateau (1970s-2019)

    The dataset is the land surface temperature (LST) product from 1980s to 2019 over the Tibetan Plateau. The dataset is retrieved based on Landsat images and a practical single-channel (PSC) algorithm. When validated with the simulation data set, the root-mean-square error (RMSE) of the PSC algorithm was 1.23 K. The corresponding quality assessment (QA) product is also generated to identify cloud, cloud shadow, ice and snow. LST is a commonly used land surface parameter, which can provide data product support for the research and applications in resources survey, ecological environment monitoring, global change research and other fields.

    2021-07-06 334 0

  • MODIS Terra 8-days products with 500m spatial resolution over the Tibetan Plateau (2000-2019)

    MODIS Terra 8-days products with 500m spatial resolution over the Tibetan Plateau (2000-2019)

    The dataset includes FPAR, GPP, NPP, evapotranspiration product and LAI product. FPAR product is and LAI product are obtained from the MODIS Terra MOD15A2H dataset, GPP and NPP product are obtained from the MOD15A2H dataset and evapotranspiration product is obtained from MODIS Terra MOD16A2 dataset from 2000 to 2019 over the Tibetan Plateau,which is downloaded from USGS, and their formats are converted from .hdf to .tif by GDAL.The quality assessment files are also included for aboved products,and they are stored in an efficient bit-encoded manner.The MODIS products play an important role in forest, agriculture, ecology.

    2021-07-05 281 27

  • Deformation data after 2008 Wenchuan earthquake (2008-2018)

    Deformation data after 2008 Wenchuan earthquake (2008-2018)

    The data set consists of 93 continuous and mobile GPS stations recording the cumulative three-dimensional deformation variables 10 years after the 2008 mw7.9 Wenchuan earthquake. GPS daily sampling time series data are mainly from the website of China Seismological Bureau( http://www.cgps.ac.cn/ )Diao, F., Wang, R., Wang, Y., Xiong, X., Walter, T.R. (2018), fault behavior and lower critical physiology informed from the first seven years of postseismic GPS data after the 2008 Wenchuan earthquake, earth planet. SCI. Lett., 495, 202-212, DOI: 10.1016/j.epsl.2018.05.020. We process the post earthquake deformation data as follows: first, we correct other effects unrelated to the Wenchuan earthquake, such as seasonal variation, interannual variation, plate effect, etc; Thirdly, the post earthquake time series curve is fitted by exponential function and logarithmic function; Finally, the post earthquake deformation of any period is calculated by fitting the curve. Ten years after the earthquake, the accumulated deformation is nearly 21 cm. The horizontal accuracy is not less than 1.7 cm, and the vertical accuracy is not less than 4 cm.

    2021-07-05 245 0

  • GPS 5 years after 2015 Nepal earthquake (2015-2020)

    GPS 5 years after 2015 Nepal earthquake (2015-2020)

    The data set includes cumulative 3-D deformation variables recorded by 50 continuous and mobile GPS stations 5 years after the 2015 mw7.8 Nepal earthquake. Data from published articles: Zhang, J., Zhao, B., Wang, D., Yu, J., and tan, K. (2021), dynamic modeling of postseismic deformation following the 2015 MW 7.8 Gorkha earth, Nepal, J. Asian Earth SCI., 215104781, Doi: 10.1016/j.jseaes.2021.104781. The post earthquake deformation data processing process is as follows: firstly, the original observation data are processed to obtain the time series under ITRF reference frame; Then, other effects unrelated to the Nepal earthquake, such as seasonal variation, interannual variation, plate effect, etc., are corrected; Thirdly, the post earthquake time series curve is fitted by logarithmic function; Finally, the post earthquake deformation of any period is calculated by fitting the curve. Five years after the earthquake, the accumulated deformation is nearly 13.8 cm. The horizontal accuracy is not less than 0.6cm, and the vertical accuracy is not less than 2.0cm.

    2021-07-05 203 6

  • Hyperspectral survey data of typical features -- Sanjiangyuan, Qinghai (2020)

    Hyperspectral survey data of typical features -- Sanjiangyuan, Qinghai (2020)

    This data set is the hyperspectral survey data of typical features in Sanjiangyuan area in August 2020. Using DJI M600 with Cubert S18 hyperspectral imager. The hyperspectral data of typical surface features observed in the Sanjiangyuan area in 2020 are included. The day of hyperspectral shooting was sunny, and the white board was calibrated before the flight; The longitude and latitude coordinates are recorded by differential GPS for precise geometric calibration. The dn value recorded by Hyperspectral camera of UAV can be converted into reflectivity by using Spectron Pro software. Hyperspectral data is used to extract spectral characteristics of different vegetation types, vegetation classification, inversion of vegetation coverage and so on.

    2021-07-05 270 0

  • Questionnaire on disaster risk prevention ability and social vulnerability in Hengduan Mountain Area (2020)

    Questionnaire on disaster risk prevention ability and social vulnerability in Hengduan Mountain Area (2020)

    As a typical representative of mountainous areas in western China, Hengduan Mountain Area has become one of the areas with frequent and most serious geological disasters, which has brought great threats to rural settlements located in mountainous areas. Therefore, the vulnerability of village disasters and comprehensive risk prevention capability have gradually become an important topic of disaster prevention and disaster mitigation in rural areas. This data is from a random questionnaire survey conducted in Xiamachang Village, Meixing Town, Xiaojin County, Dashiban Village, Huiping Town, Mianning County, Sichuan Province, and Qina Village, Qina Town, Yongsheng County, Yunnan Province, from August to September, 2020. And the interviewees are mainly adults who is familiar with family situations. The design of the questionnaire is based on the principles of scientific nature, applicability, feasibility, typicality and concreteness. And Questionnaire on Disaster Risk Prevention Ability and Social Vulnerability of Villages in the Hengduan Mountain Area is designed for individual villages in the Hengduan Mountain Area. In order to ensure the reliability and validity of the questionnaire, some questionnaire was pre-investigated before the formal investigation, and there were some modification and improvement about the problem founded. Also, before the formal questionnaire survey, the investigators were given an explanation of the questionnaire and the training of the survey skills. 171 questionnaires were completed in this survey. After eliminating 20 invalid questionnaires, 151 valid questionnaires were obtained, including 50 from Xiamachang Village, 39 from Dashiban Village and 62 from Qina Village, respectively. The effective rate of questionnaires was 88.3%.

    2021-07-02 324 14

  • Statistical data of water resources in Qinghai Tibet Plateau (2004-2016)

    Statistical data of water resources in Qinghai Tibet Plateau (2004-2016)

    This data set includes the statistical data of water resources in Tibet and Qinghai. The data comes from Tibet water resources bulletin and Qinghai water resources bulletin. The statistical scale is the municipal unit scale, including Xining City, Haidong City, Haibei Prefecture, Hainan prefecture, Huangnan Prefecture, Guoluo Prefecture, Yushu prefecture and Haixi Prefecture in Qinghai Province, Lhasa, Changdu, Shannan, Shigatse, Naqu and other municipal units in Tibet Ali, Linzhi and other municipal units; Variables include annual precipitation, surface water resources, groundwater resources, repeated calculation, total water resources, per capita water resources, water production modulus, surface water supply, groundwater supply, total water supply, agricultural water consumption, industrial water consumption, domestic water consumption, ecological environment water consumption and total water consumption. The data set can be used in the fields of water resources management and ecological environment protection in the Qinghai Tibet Plateau.

    2021-07-01 98 37

  • Net primary productivity data of Tibetan Plateau ecosystem (2015)

    Net primary productivity data of Tibetan Plateau ecosystem (2015)

    Net primary production (NPP) is the basic resource to maintain the life of human and heterotrophic organisms. It is the basic index to measure the structural characteristics and carrying capacity of ecosystem. In this study, the total primary production (GPP) data of 2015 based on the vegetation photosynthesis model (VPM) was used to calculate the NPP data by calculating the ratio of autotrophic respiration. The data can be used to analyze the spatial pattern of vegetation productivity in the Qinghai Tibet Plateau, which is of great significance to the ecological protection of the Qinghai Tibet Plateau.

    2021-07-01 249 37

  • Topographic relief and suitability evaluation data set of Qinghai Tibet Plateau

    Topographic relief and suitability evaluation data set of Qinghai Tibet Plateau

    Topographic relief is a comprehensive representation of regional altitude and surface cutting degree. Based on the definition and calculation formula of topographic relief under the background of China's human settlements assessment, the digital elevation model (Aster GDEM 30 m) data is resampled into 1 km, The data set includes: (1) kilometer grid spatial data of Tibetan Plateau topographic relief( 2) Terrain suitability evaluation data of Qinghai Tibet Plateau. The data can be used to analyze the spatial difference of topographic relief of the Qinghai Tibet Plateau, which is of great significance to the study of human settlements and Natural Suitability of the Qinghai Tibet Plateau.

    2021-07-01 356 49

  • Dataset of water quality investigation in the key urbanized area of Tibetan Plateau (2020)

    Dataset of water quality investigation in the key urbanized area of Tibetan Plateau (2020)

    The dataset of water quality investigation in the urbanized area of Tibetan Plateau mainly includes the investigation data of water quality in the Huangshui River Basin and other key urban areas of Tibetan Plateau. The data were collected during July-August, 2020, by Hash DR900 water quality monitor. The datasets include the measured water quality of each reach of the Huangshui River, and the upstream and downstream of rivers that flow through major towns on the Tibetan Plateau. The main parameters include: total nitrogen, total phosphorus, ammonia nitrogen, chemical oxygen demand, dissolved oxygen content, pH, hardness, turbidity and chroma. To note, the chemical indexes (total nitrogen, total phosphorus, ammonia nitrogen, chemical oxygen demand) were determined in the laboratory after the scientific expedition, and the time interval between sample collection and water quality determination is too long to sustain the original content of ammonia nitrogen, thus the ammonia nitrogen of some water samples were not measured. In addition, due to the budget restriction, only water samples from the river outlet of towns on the plateau were allowed to measure the chemical indexes. Our dataset will support the study of optimizing the ecological security barrier system and validating ecohydrological models in the key urbanized areas of the Tibetan Plateau.

    2021-06-28 210 0

  • MODIS Terra surface reflectance products over the Tibetan Plateau (2000-2019)

    MODIS Terra surface reflectance products over the Tibetan Plateau (2000-2019)

    The dataset is the MODIS Terra surface reflectance products from 2000 to 2019 over the Tibetan Plateau,each period of data contains 13 files: 7 surface reflectence files, 3 observation angle files, 2 quality control files and 1 time description file. The dataset is download from USGS and its format is converted from .hdf to .tif by GDAL.The sur_refl_qc_500m and sur_refl_state_500m layers are the quality identification documents,which are stored in an efficient bit-encoded manner.The MODIS surface reflectance play an important role in forest, water resources, climate change.

    2021-06-28 239 15

  • Detrital composition, detrital zircon U-Pb dating and zircon Hf isotope data set of Carboniferous Permian and Jurassic Cretaceous sandstones in the Tibetan Plateau (Bannu Qiangtang Lhasa)

    Detrital composition, detrital zircon U-Pb dating and zircon Hf isotope data set of Carboniferous Permian and Jurassic Cretaceous sandstones in the Tibetan Plateau (Bannu Qiangtang Lhasa)

    This data set includes detrital composition, detrital zircon U-Pb isotopic age and zircon Hf isotopic data of Carboniferous Permian and Jurassic Cretaceous sandstones from Bannu belt to Lhasa block, Qinghai Tibet Plateau. The sampling time is from 2018 to 2019, and the samples are distributed in Nanqiangtang and Bannu zones. Rock samples include 9 sandstones, 1 flysch and 2 pyroclastic rocks. The discussion based on the data provides an important basis for defining the opening and closing time of Bangong Nujiang ocean in the central Tibetan Plateau, which is of great significance for the study of Bangong Nujiang ocean. The detrital composition of sandstone is mainly analyzed by thin section method and point counting method. The zircon U-Pb dating is performed by laser ablation plasma mass spectrometry (LA-ICP-MS), and the zircon Hf isotope is measured by multi receiver inductively coupled plasma mass spectrometry (MC-ICP-MS), The testing units include the Key Laboratory of Northeast Asian mineral resources evaluation, Ministry of natural resources, Jilin University and Beijing Kehui Testing Technology Co., Ltd. This data set has been published in the international SCI journals tectonics and palaeogeography, palaeolimatology, palaeoecology, and has been cited many times. The data results are true and reliable.

    2021-06-25 202 5

  • Mineral whole rock geochemical and isotopic data set of basic rocks in ophiolites of the Tibetan Plateau (middle part of Bangong Nujiang suture zone )

    Mineral whole rock geochemical and isotopic data set of basic rocks in ophiolites of the Tibetan Plateau (middle part of Bangong Nujiang suture zone )

    The data set includes the whole rock major and trace elements, Sr Nd isotopes, zircon U-Pb ages and trace elements, single mineral electron microprobe and plagioclase ar ages of the basic rocks in the ophiolite of the middle part of the Bangonghu Nujiang suture zone, Qinghai Tibet Plateau. The sampling time was 2014-2016, and the locations were the South Bank of ponco and the West Bank of Namco. The rock samples include 7 high magnesian andesites, 3 vitrinite dikes, 4 gabbros and 14 basalts on the South Bank of pengcuo. The data provide support for the study of the material composition, chronology and geochemistry of the central Tibet ocean floor plateau and the Cenozoic oceanic inner arc fragments, and are of great significance for understanding the formation and evolution of the Bangong central Tethys ocean floor plateau and the Cenozoic oceanic inner arc. The main and trace elements of the whole rock were measured by XRF and ICP-MS, respectively. The zircon U-Pb dating and trace elements were measured by la-icp-ms. the main elements of single mineral were analyzed by EPMA. The whole rock SR Nd isotope was measured by ion exchange resin separation and ICP-MS, The AR ar age of plagioclase is obtained by laser heating and isotopic analysis after the sample is irradiated by nuclear reactor, and the data are true and reliable. The testing units include State Key Laboratory of metallogenic mechanism of endogenetic metallic deposits in Nanjing University, modern analysis and testing center of Nanjing University, State Key Laboratory of continental dynamics in Northwest University, AR, u-th-he geochronology Laboratory of Institute of Geology and Geophysics, Chinese Academy of Sciences, and EPMA Laboratory of School of resources and environmental engineering, Hefei University of technology. The article of the data set has been published in the well-known journal "Gondwana research". According to Google academic statistics, it has been cited 18 times.

    2021-06-25 212 8

  • Fission-track and Cenozoic detrital zircon U-Pb chronological results

    Fission-track and Cenozoic detrital zircon U-Pb chronological results

    There are 6 apatite fission track data and 2 zircon fission track data in tiekelike mountain, West Kunlun. The age error is less than 10%; The results show that the tiekelike mountains in the north of West Kunlun have undergone rapid exhumation since Miocene. There are 17 groups of detrital zircon U-Pb dating results of Cenozoic sediments from keriyang section and kashtashi section in front of West Kunlun Mountains, which are analyzed by LA-ICP-MS method, and the age concordance is less than 10%; These results indicate that the early provenance of the Piedmont sediments came from Songpan Ganzi and South Kunlun blocks, and the South Kunlun block and North Kunlun block provided provenance to the Piedmont since the Atushi formation. These results indicate that the Cenozoic uplift of the West Kunlun Mountains experienced a process of gradual northward growth. Four apatite fission track results of bedrock samples from the upper and lower walls of Tashkurgan normal fault in the Pamir orogenic belt were obtained by using the external detector method, and the age error was less than 15%; The results show that the Tashkurgan normal fault began to move about 8.5 Ma, and the footwall of the normal fault tilted westward, which may indicate that there was a structural system transformation from the previous north-south compression orogeny to the late Cenozoic East-West collapse extension in the East Pamir area.

    2021-06-25 168 0

  • Stratigraphic histogram of Quanshui Lake

    Stratigraphic histogram of Quanshui Lake

    This data is the stratigraphic histogram of Quanshui Lake in Kunlun mountain area, including the characteristic elements of stratigraphic thickness and lithologic changes, which is based on detailed field survey and indoor analysis. The specific processing method is as follows: through field investigation, obtain the material of formation lithology composition, formation thickness, structural characteristics, etc., and draw the draft of stratigraphic histogram by hand. Back in the room, the lithology of rock is confirmed by thin section identification, and then the histogram is electronized by CorelDRAW software. This map is about 4MB in size with high resolution. It can be used for stratigraphic investigation, lithological analysis, the highest marine strata in Kunlun Mountain, paleontology and paleogeography.

    2021-06-23 161 0

  • Stratigraphic histogram of Hongshanhu area

    Stratigraphic histogram of Hongshanhu area

    This data is a histogram of red coral stratum in Kunlun mountain area, including the characteristic elements of stratum thickness and lithology change, which is based on detailed field survey and indoor analysis. The specific processing method is as follows: through field investigation, obtain the material of formation lithology composition, formation thickness, structural characteristics, etc., and draw the draft of stratigraphic histogram by hand. Back in the room, the lithology of rock is confirmed by thin section identification, and then the histogram is electronized by CorelDRAW software. This map is about 4MB in size with high resolution. It can be used for stratigraphic investigation, lithological analysis, the highest marine strata in Kunlun Mountain, paleontology and paleogeography.

    2021-06-23 165 0