The Second Tibetan Plateau Scientific Expedition (STEP) program

Brief Introduction: Second Tibetan Plateau Scientific Expedition Program

Number of Datasets: 694

  • The daily albedo product coupling topographic effects and combining multi-sensory data over the Tibet Plateau (2016)

    The daily albedo product coupling topographic effects and combining multi-sensory data over the Tibet Plateau (2016)

    This daily land surface albedo proudct is with a spatl resolution of 0.02 ° x 0.02 ° over the Tibet Plateau in 2016. Multi-sensory data is used to retrieve the Multisensor Combined BRDF Inversion Model developed from a kernel-driven BRDF model and coupled with topographic effects, and prior knowledge is introduced for quality control inversion. The high-precision BRDF / albedo of good spatial-temporal continiuty is retrieved by combining MODIS reflectance data (a polar orbiting satellite) and himiwarri-8 AHI land surface reflectance (a geostationary satellite ). MODIS lans surface reflectance data and AHI TOA reflectance data are downloaded from the official websites. After registration, atmospheric correction and other processing, the daily resolution BRDF is synthesized with a period of 5 days, and then the daily resolution albedo is estimated. The validation results show that it meets the accuracy requirements of albedo application. Compared with similar products, it has more advantages in capturing rapidly changing surface features, and has better temporal and spatial continuity. It can effectively support the study of radiation energy balance and environmental change in the Tibet Plateau.

    2021-03-08 1464 454

  • Biomarker data of Qilian Mountains (2022)

    Biomarker data of Qilian Mountains (2022)

    1) Data content: Biomarker data can be used to reconstruct palaeoclimate. In addition to climate reconstruction, this set of data also tries to reconstruct palaeoclimate altitude, and obtains good results 2) Data sources and processing methods Biomarker analysis: After ultrasonic extraction, the samples were separated by column chromatography to obtain methanol elution components. After constant volume, the GDGT data were tested and analyzed on LC-MS 3) Data quality Sample collection and experimental processing were carried out in accordance with strict standards, and the data obtained were of reliable quality. 4) Data application achievements and prospects Published a SCI paper using these data (Frontiers in Earth Science).

    2022-06-04 198 40

  • Distributions of debris flows in CPEC and Tianshan Mountain

    Distributions of debris flows in CPEC and Tianshan Mountain

    This data provides the distribution of debris flows in the China-Pakistan Economic Corridor and the Tianshan Mountains by 2021. Based on historical data collection, field surveys and interpretation of remote sensing images, combined with digital topographic maps (DEM) and geological maps, the latest China-Pakistan economic The debris flow distribution data of the corridor (foreign section) has good reliability of data information, and the data can be used as the basic data for debris flow distribution law, debris flow risk, and risk calculation. The extraction of the debris flow basin mainly adopts the hydrological analysis method in ArcGIS, taking into account the accuracy limitation of DEM, combined with Google Earth images to perform necessary manual correction.

    2022-06-20 223 0

  • Sedimentary ancient DNA data  from baishiya Karst Cave

    Sedimentary ancient DNA data from baishiya Karst Cave

    Sediment ancient DNA is biological ancient DNA scattered in Paleoenvironmental samples, which is different from ancient DNA directly extracted from ancient animal bones and plant remains. Paleoenvironmental DNA is mainly mixed with multi species ancient DNA extracted from environmental samples such as glaciers, frozen soil, lake sediments, peat sediments, site cultural layer, dental calculus and fecal fossils. These DNA enter the environment with biological residues (including remains, hair, feces and urine), degrade rapidly and denature slowly in the environment, and finally adsorb on minerals and other particles or integrate into their own genome by microorganisms for long-term preservation, thus forming paleoenvironmental DNA. Sediment DNA is a new ancient DNA analysis technology. The sediments of archaeological sites can track the DNA preservation status of relevant sites and possible humans, make up for the shortcomings that human fossils are generally available but not available, greatly expand the research object and open a new window to study the population evolution of Paleolithic archaeological sites. The ancient DNA of stratum sediments from baishiya karst cave site where Xiahe human mandible was found was systematically sampled and analyzed.

    2021-09-27 450 152

  • Urban landuse pattern simulation of Xining City (2050)

    Urban landuse pattern simulation of Xining City (2050)

    Based on the future population forecast data, urban expansion driving factor data (road network density, residential area, night light, GDP) and so on, the future urban expansion model is used to simulate and predict the urban expansion pattern and land use distribution of Xining City in 2050. The data set contains four data results corresponding to the urban pattern of Xining in 2050 under different scenarios. They are maintaining the status quo (BAU), urban compact development (infill), continuing the existing pattern and protecting cultivated land (protect), compact development and protecting cultivated land (infill).

    2021-02-03 2639 2

  • Driving data of surface meteorological elements in the eastern Qinghai Tibet Plateau with a horizontal resolution of 3km * 3km and an hour (2010)

    Driving data of surface meteorological elements in the eastern Qinghai Tibet Plateau with a horizontal resolution of 3km * 3km and an hour (2010)

    Based on the regional environment integrated system model developed by the Key Laboratory of regional climate and environment, Chinese Academy of Sciences, a regional climate model for convective analysis of the Qinghai Tibet Plateau is established. The grid center of the model simulation area is located at (34n, 100e), the horizontal resolution is 3km, and the number of simulation grid points of the model is 465 (longitude) x 375 (latitude). The vertical direction is 27 floors. The air pressure at the top of the model layer is 50 HPA. The buffer zone consists of 15 grids, the integration time is one year in 2010, and the horizontal resolution of the European medium range weather forecast center is 0.25x0 25. The reanalysis data of era5 with a time interval of 6 hours is used as the driving field to generate the driving data of surface meteorological elements on the Qinghai Tibet Plateau in 2010 with a horizontal resolution of 3 km * 3 km and a time interval of 1 hour After dynamic downscaling by using the convection analysis regional climate model of the Qinghai Tibet Plateau, the bottleneck problem of the lack of meteorological data sets with long-time series and high spatial-temporal resolution in the Qinghai Tibet Plateau and other regions is solved, so as to provide a solid and reliable scientific data foundation for the future change of climate and environment and the construction of ecological security barrier in the Qinghai Tibet Plateau.

    2022-05-31 406 0

  • Long time series ecological background map of Qinghai Tibet Plateau (1990-2015)

    Long time series ecological background map of Qinghai Tibet Plateau (1990-2015)

    Based on the medium resolution long time series remote sensing image Landsat, the data set obtained six periods of ecosystem type distribution maps of the Qinghai Tibet Plateau in 1990 / 1995 / 2002 / 2005 / 2010 / 2015 through image fusion, remote sensing interpretation and data inversion, and made the original ecological base map of the Qinghai Tibet Plateau in 25 years (1990-2015). According to the area statistics of various ecosystems in the Qinghai Tibet Plateau, the area of woodland and grassland decreased slightly, the area of urban land, rural residential areas and other construction land increased, the area of rivers, lakes and other water bodies increased, and the area of permanent glacier snow decreased from 1990 to 2015. The atlas can be used for the planning, design and management of ecological projects in the Qinghai Tibet Plateau, and can be used as a benchmark for the current situation of the ecosystem, to clarify the temporal and spatial pattern of major ecological projects in the Qinghai Tibet Plateau, and to reveal the change rules and regional differences of the pattern and function of the ecosystem in the Qinghai Tibet Plateau.

    2022-04-18 3336 39

  • Vegetation environmental research data set in key areas of Asian water tower area of Qinghai Tibet Plateau (2019-2020)

    Vegetation environmental research data set in key areas of Asian water tower area of Qinghai Tibet Plateau (2019-2020)

    This data set includes six data files, which are: (1) soil temperature and moisture data of alpine meadow elevation gradient_ Dangxiong, Tibet (2019-2020). This data is the hourly observation data of temperature and water content at different soil depths (5cm and 20cm) of the alpine meadow at 4400m, 4500m, 4650m, 4800m, 4950m and 5100m above sea level in Dangxiong, Tibet during 2019-2020. (2) Meteorological environment data of Sejila Mountain Forest line_ Linzhi, Tibet (2019), the data is the hourly meteorological environment (including wind speed, air temperature 1 m away from the surface, relative humidity 1 m away from the surface, air temperature 3 m away from the surface, relative humidity 3 m away from the surface, atmospheric pressure, total radiation, net radiation, photosynthetically active radiation, 660 nm) of the forest line of Sejila Mountain in Linzhi, Tibet in 2019 Hourly observation data of red light radiation, 730nm infrared radiation, surface temperature, atmospheric long wave radiation, surface long wave radiation, underground 5cm-20cm-60cm heat flux, underground 5cm-20cm-60cm soil temperature and humidity, rainfall and snow thickness, among which some observation data are missing due to equipment power failure in plateau area, which has been explained in the data. (3) NDVI of vegetation at major meteorological stations_ In the Qinghai Tibet Plateau (2020), NDVI survey data and average values of vegetation near 25 meteorological stations are included. (4) Land use survey data set_ Along the Sichuan Tibet Railway (2019), including 35 survey points along the Sichuan Tibet railway land use survey data, including survey time, location, latitude and longitude, altitude, slope aspect, main vegetation types and dominant species. (5) Leaf area index survey data_ The leaf area index (LAI) of main vegetation types along Sichuan Tibet Railway (2019) was measured by SunScan canopy analyzer and lai-2200. (6) Survey data of soil temperature and humidity_ Along the Sichuan Tibet Railway (2019), including 34 survey points along the Sichuan Tibet Railway: location, longitude and latitude, altitude, soil surface temperature, soil moisture at 30cm, the data were recorded as 3 repeated measurements at each survey point. The data set can be used to analyze and study the change law of vegetation environment in Qinghai Tibet Plateau.

    2021-04-20 3387 0

  • Vegetation survey data in Ali-Nagqu area, Tibet (2019-2020)

    Vegetation survey data in Ali-Nagqu area, Tibet (2019-2020)

    The data includes the basic survey data of the sampling points, the community species coverage, height and density of the sample square, as well as the aboveground biomass of the species, the temperature, moisture, pH, available nitrogen, available phosphorus, total carbon of the 0-10cm surface soil , Total nitrogen content (the basic information of the sample site includes the collection site, date, and soil condition of the collection site. The CK in the process is sampled without species (5), and D is the sample sample for degraded grassland (5). A), litter, dead, sand-covered...information of saline-alkali spots are respectively 0 for no, 1 for less, 2 for more, bare land area as a percentage; species height, coverage, density, and above-ground biomass collection The survey sample area is 50cm*50cm, each site has 10 samples, the coverage is expressed as a percentage, the height is cmcm, the density is expressed by the number of species, 0-10cm surface soil information for each The site has 3 repetitions. The degree of degradation is divided into high degradation (HG), moderate degradation (MG), and light degradation (LG). The utilization rate is heavy and light. Units are marked in the title). The data are all collected and measured on the spot. The total carbon is the elemental analysis method, the total nitrogen is the Kjeldahl method, the effective nitrogen is the alkaline solution diffusion method, the effective phosphorus is the extraction-molybdenum antimony colorimetric method, and the PH is the electric potential method. , Temperature and moisture are measured by soil thermometer and soil moisture meter. The data is of good quality and can be used to calculate biodiversity and analysis of driving factors for species existence.

    2021-06-09 2158 0

  • Simulation forced by orbital variation during the Holocene (2019-2020)

    Simulation forced by orbital variation during the Holocene (2019-2020)

    The Holocene single orbit parameter change simulation results (2019-2020) data set uses the earth system model cesm model (horizontal resolution: about 2 ° for the atmosphere and land surface module and about 1 ° for the ocean and sea ice module) to carry out the Holocene transient simulation test considering the change of earth orbit parameters. The spatial resolution is 2 °; Spatial range: North: 50 ° n, South: 20 ° n, West: 60 ° e, East: 130 ° E; Regional scope: Eurasia; The time range is Holocene. The simulation results can be used to analyze the changes of westerly monsoon in Eurasia under the influence of individual orbital parameters in Holocene.

    2021-07-30 2307 0

  • Flow discharge observation data of Selincuo Lake’s inflow river - Boquzangbu (2017)

    Flow discharge observation data of Selincuo Lake’s inflow river - Boquzangbu (2017)

    This is the flow discharge observation data observed in the estuary of Boquzangbu, which is Selincuo Lake’s inflow river. It is measured by Flow Tracker portable hydrological flow rate meter. It can be used in Hydrologic Process in Cold Regions and other disciplinary areas. The data is observed on August 16, 2017. The observation includes time, location, depth of water, water flow rate, and water flow discharge. The data is stored as an excel file.

    2019-11-18 5665 29

  • Comprehensive risk of road traffic in Himalayan and Asian water tower area (2021)

    Comprehensive risk of road traffic in Himalayan and Asian water tower area (2021)

    Based on the damage rate of each disaster collected in the Qinghai Tibet scientific research, the relative risk level of a single disaster is divided. The comprehensive natural disaster risk grade evaluation method is adopted. Based on the risk evaluation results of single disaster, the comprehensive evaluation is carried out according to the weight obtained by the occurrence frequency of each disaster. The comprehensive risk data of road traffic around the Himalayas includes the vector data of roads around the Himalayas and the comprehensive risk level of each road section, It is divided into five levels: low risk (1), medium and low risk (2), medium risk (3), medium and high risk (4) and high risk (5). It represents the relative size of possible loss or damage to the road traffic system under the comprehensive impact of various natural disasters in the study area. It can provide a reference basis for road risk prevention and emergency management.

    2022-02-25 390 6

  • Namuco station (2019) and Southeast Tibet station (2021) air pollutant flux and vertical gradient data set

    Namuco station (2019) and Southeast Tibet station (2021) air pollutant flux and vertical gradient data set

    This data is obtained through observation at Namucuo multi cycle comprehensive observation and research station of Chinese Academy of Sciences (2019) and Tibetan southeast alpine environment comprehensive observation and research station of Chinese Academy of Sciences (2021), including the earth atmosphere exchange flux or vertical gradient of species such as O3, NOx, HONO, H2O and HCHO. The time range is from April 28, 2019 to July 10, 2019 (Namuco station) and from May 2, 2021 to May 13, 2021 (Southeast Tibet station). The data consists of five documents. Documents 1-4 are the flux data and H2O vertical gradient, HONO vertical gradient and NO2 vertical gradient observed at Namuco station in 2019. Document 5 is the flux data observed at Southeast Tibet station in 2021. During the monitoring period, data was missing due to instrument status problems. This data has broad application prospects and can serve graduate students and scientists with backgrounds such as atmospheric science, climatology, and ecology.

    2022-06-08 332 1

  • Leaf fossils of Sabalites (Arecaceae) from the Oligocene of northern Vietnam and their paleoclimatic implications

    Leaf fossils of Sabalites (Arecaceae) from the Oligocene of northern Vietnam and their paleoclimatic implications

    Recent paleobotanical investigations in Vietnam provide a good opportunity to improve our understanding of the biodiversity and paleoclimatic conditions in the geological past of Southeast Asia. Palms (Arecaceae) are a diverse family of typical thermophilous plants with a relatively low tolerance for freezing. In this study, we describe well-preserved fossil palm leaves from the Oligocene Dong Ho Formation of Hoanh Bo Basin, northern Vietnam. Characters of the fossil leaves, such as a fan-shaped costapalmate lamina, an unarmed petiole, a costa slightly enlarged at the base that then tapers distally into the blade, and well-preserved amphistomatic leaves with cuticles, suggest that they represent a new fossil species, which we herein designate Sabalites colaniae A. Song, T. Su, T. V. Do et Z.K. Zhou sp. nov. Together with other paleontological and palaeoclimatic evidence, we conclude that a warm climate prevailed in northern Vietnam and nearby areas during the Oligocene.

    2022-03-03 665 0

  • Chemical data of the rare-element minerals from the Kuqu leucogranite and pegmatite, Tibet, China

    Chemical data of the rare-element minerals from the Kuqu leucogranite and pegmatite, Tibet, China

    This data includes in-situ major and trace element data of lithium aluminosilicate minerals and beryl, and in-situ major element data of niobium tantalum oxide. The samples were collected from Kuqu leucogranite and granite pegmatite in the eastern Himalaya. The data of major mineral elements are obtained by electron microprobe, and the data of trace mineral elements are obtained by laser ablation inductively coupled plasma mass spectrometry. The obtained data can reveal the complex crystallization environment during mineral formation, show the supersaturation caused by crystallization differentiation and supercooling and fluid action, reflect the evolution degree of crystallization environment and magmatic differentiation, and explore the evolving relationship between leucogranite and granite pegmatite and the prospect of rare metal mineralization.

    2022-04-15 50 70

  • Bathymetric data of Laangcuo Lake (2017)

    Bathymetric data of Laangcuo Lake (2017)

    This data set is the measurement of the depth of Laangcuo Lake during the River and Lake Source Investigation in 2017. It can be used to map lake isobath, to estimate the water quantities in lakes and to study water balance of the basin. It was measured by the Lowrance HDS-5 sonar depth finder. The original measured data contains a lot of invalid depth data, which has all been eliminated in the post-selecting process. The selected measuring line is reasonable, and the data covers various depth gradients. The data is stored as an excel file.

    2019-11-18 3075 18

  • Tracking data of Wintering Black necked Crane population in Central Yunnan Province (2021) (2019qzkk05010409)

    Tracking data of Wintering Black necked Crane population in Central Yunnan Province (2021) (2019qzkk05010409)

    Using satellite tracking technology, this sub project (2019QZKK05010409) tracked the overwintering population in the middle of black necked Crane. After catching the black necked Crane by the foot button method, we adopt the foot ring method to fix the tracker, which greatly improves the tracking achievement rate and the amount of data obtained. When the power is ideal, the sampling frequency can be accelerated to one point in half an hour. Get more detailed tracking data. The relevant results show that the selection of wintering sites for black necked cranes is highly stable. Preliminary analysis shows that there is a strong connecting line between wintering sites and breeding sites, but there are also the characteristics of larvae in different summers. The strong migration connectivity indicates that black necked cranes are more vulnerable to environmental changes. This data set contains 200 habitat photos of black necked cranes and 1276 activity data of young black necked cranes. The satellite tracking data sheet of young black necked Crane recorded longitude and latitude, date, altitude, speed, temperature and other information.

    2022-04-27 203 0

  • Cropland spatial dataset of Brahmaputra River and Its Two Tributaries in 1730

    Cropland spatial dataset of Brahmaputra River and Its Two Tributaries in 1730

    Tibetan Plateau with high altitude,cold climate,poor natural conditions and fragile ecological environment become the sensitive and promoter region of global climate change.Studying for Land reclamation of historical period in Qinghai-Tibet Plateau is not only the specific way to participate in the global environmental change, but also can provide the comprehensive research of land use change with abundant regional information,there is important significance for studying history in our country even the whole world of land use/cover change research.The region of Brahmaputra River and its two tributaries in Tibetan Plateau pastoral transitional zone is one of the important typical agricultural area, and is the area with the most intense land reclamation activities and the fastest population growing.Proceeding deep historical data mining in the study area to reconstruct the cropland spatial patterns over the past 300 years has important significance to study the human land use activities under the background of global climate change. This data contains raster data on the spatial distribution pattern of arable land in Brahmaputra River and Its Two Tributaries in 1730 with a spatial resolution of 500m*500m.The data of cultivated land in 1730 comes from tiehu Inventory,the missing data of two counties were interpolated.The land area recorded in the data is converted into modern mu units, and the missing counties are calculated using the area's per capita cultivated land and population.

    2022-01-21 347 97

  • Precipitation observation data of the east bank of Selincuo Lake (2016-2017)

    Precipitation observation data of the east bank of Selincuo Lake (2016-2017)

    This is the precipitation observation data set of the east bank of Selincuo Lake. It can be used in Glaciology, Climatology, Environmental Change, Hydrologic Process in Cold Regions and other disciplinary areas. The data is observed from September 1, 2016 to August 17, 2017. It is measured by automatic rain gauge and a piece of data is recorded every 60 minutes. The original data forms a continuous time series after quality control, and the daily mean index data is obtained through calculation. The original data meets the accuracy requirements of China Meteorological Administration (CMA) and the World Meteorological Organization (WMO) for meteorological observation. Quality control includes eliminating the systematic error caused by the missing point data and sensor failure. The data is stored as an excel file.

    2019-11-18 5233 36

  • Field exploration dataset of the western and northern Qinghai-Xizang Plateau on stratigraphy and palaeontology

    Field exploration dataset of the western and northern Qinghai-Xizang Plateau on stratigraphy and palaeontology

    The Yarlung Zangbo suture zone and its neighbouring areas are key to the research of the evolution of Neo-Tethys. The sedimentary sequence as evidence of the evolution of Neo-Tethys remains unclear in many areas, particularly in the western and northern Xizang. The limits in stratigraphy and sedimentology have greatly restricted the investigation of the evolution of Neo-Tethys as well as the collision between Indian-Eurasian plates. This exploration team conducted a joint investigation on the Mesozoic strata in this area, with emphasis on their stratigraphy, palaeontology, and sedimentology, to retrieve potential stratigraphic and sedimentary evidence of the opening, evolution, and retreat of the Neo-Tethys. This dataset records the work of the expedition team in Xigaze, Ngari and Nagqu of Xizang. It consists of four parts, each part includes diaries and photos of the strata, geological structure, profiles, and fossils that have been collected by a special expedition group. The explored strata encompass the Cretaceous and Paleogene and the radiolarite strata in the above mentioned areas.

    2021-12-06 466 0