Reconstruction data of narun river runoff in the upper reaches of SYR River (1753-2017)

This data is the runoff data of nalun hydrological station in the upper reaches of the SYR River from 1753 to May to August 2017 reconstructed based on tree ring data. It is obtained from the tree ring hydrological research jointly carried out by Urumqi desert Meteorological Institute of China Meteorological Administration and the Institute of water and Hydropower of the Kyrgyz National Academy of Sciences. The data can be used for scientific research such as water resources assessment and water conservancy projects in mountainous areas of Central Asia, and the observation time is the calibration period, The linear transformation equation of runoff and tree ring data is established to reconstruct the path quantity. Data period: 1753 to 2017. Data element: average runoff from May to August (m3 / s) Station location: 41.43 ° ″ n, 76.02 ° ″ e, 2039m

0 2022-06-07

14C dating data of Ngamring Co, Yilong lake, Guozha Co, Bangda Co and Gongzhu Co

This data includes 50 14C dating data of 5 Lake cores (ANGREN jincuo, Yilong lake, guozhaco, bangdaco and gongzhucuo). The age control of lake sediment cores depends on radiocarbon isotope (14C) dating. The chemical treatment and analysis test of this batch of samples were completed in Miami beta laboratory and Peking University in the United States. The test time was 2018-2022. The test process was carried out in strict accordance with relevant standards. The data sheet includes the lake core sample number, laboratory sample number, dating sample depth, 14C dating results, dating error and corrected results, etc. Good chronological control is the basis of paleoenvironmental reconstruction.

0 2022-06-05

Magnetic susceptibility and chromaticity data of Oligocene Baiyanghe Formation in the northeastern margin of the Tibetan Plateau and the southern margin of jiuxi Basin

Magnetic susceptibility and chromaticity data of the Oligocene Baiyanghe Formation in the southern margin of the Jiuxi Basin on the northeastern margin of the Tibet Plateau. The data are experimental data. The average sampling interval in the field is 1m, and a total of 437 pieces of magnetic susceptibility and chromaticity data were obtained. Magnetic susceptibility data was measured with a Bartington MS-2 portable magnetic susceptibility meter; chromaticity data was measured with a Konica Minolta CM-700 spectrophotometer. Sample collection, pre-processing and experimental procedures were carried out in accordance with strict standards, and the quality of the data obtained was reliable. The results show that the magnetic susceptibility and chromaticity values in the lower part of Baiyanghe Formation have consistent and obvious changes. Combined with the variation characteristics of the strata sedimentary facies in the profile, it is believed that a climate change event occurred in the early Baiyanghe Formation in the southern margin of the Jiuxi Basin. A large number of previous studies on stratigraphy, sedimentology and thermochronology revealed that there were no obvious tectonic events in the northeastern margin of the Tibet Plateau during this period, indicating that the climate change events in this area may be caused by regional climate changes. The climate information reflected by the magnetic susceptibility and chromaticity data of the Baiyanghe Formation in the southern margin of the Jiuxi Basin can provide data support for the study of the paleoclimate in the northeastern margin of the Tibet Plateau.

0 2022-05-26

Pollen percentage dataset for 24 common taxa of 318 surface-soil samples on the Tibetan Plateau

Understanding the modern relationships between pollen and vegetation, climate, and human land-use completely, is essential for quantitative reconstructions of past vegetation, climate and human impacts. supported by the Second Tibetan Plateau Scientific Expedition Program, we have collected more than 700 surface-soil samples together with detail vegetation survey. Hitherto, pollen analysis of 318 samples have been completed, and the submitted modern pollen dataset includes the pollen percentages of 24 common taxa, the sampling sites of the dataset cover the all vegetation types on the east and central Tibetan Plateau. The dataset can be utilized in establishment for pollen-climate, pollen-vegetation calibration-sets.

0 2022-05-16

Fossil of zooplankton remains, pigment and nutrients in Dagze Co, central Tibet Plateau (1440-2002 A.D.)

Paleoecological and paleolimnological studies can provide a long-term perspective on changes in environmental and ecosystem processes. The sediments documented both direct and indirect impacts of climate change and human activities on aquatic ecosystems. The fossils of zooplankton remain and pigments in lake sediments can reflect community structure changes of primary producers and primary consumers. The authors reconstructed the zooplankton and algal community changes during the past 600 years using carapaces of A. tibetiana and resting eggs of D. tibetana and pigments from the sediments of Dagze Co, in the central Tibet Plateau. Using total nitrogen and total phosphorus reconstructed the nutrient changes. These results suggest that algal community structure and changes in production can be attributed to alterations in the zooplankton community, with important implications for Tibetan aquatic ecosystems.

0 2022-04-19

Tree age data sampled from different glacier moraines in the central Himalayas

Data set contains tree age of trees growing at different glacier moraines in the central Himalayas. The data were obtained using tree ring samples. Cores samples were collected (almost near to the ground level to estimate the minimum age of the related moraine) using an increment borer. Samples were processed by using standard dendrochronological techniques.

0 2022-04-15

0 2022-04-15

Orographic evolution of northern Tibet shaped vegetation and plant diversity in eastern Asia

The growth of the Tibetan Plateau throughout the past 66 million years has profoundly affected the Asian climate, but how this unparalleled orogenesis might have driven vegetation and plant diversity changes in eastern Asia is poorly understood. We approach this question by integrating modeling results and fossil data. We show that growth of north and northeastern Tibet affects vegetation and, crucially, plant diversity in eastern Asia by altering the monsoon system. This northern Tibetan orographic change induces a precipitation increase, especially in the dry (winter) season, resulting in a transition from deciduous broadleaf vegetation to evergreen broadleaf vegetation and plant diversity increases across southeastern Asia. Further quantifying the complexity of Tibetan orographic change is critical for understanding the finer details of Asian vegetation and plant diversity evolution. *: Corresponding author

0 2022-04-09

Late Eocene sclerophyllous oak from Markam Basin, Tibet, and its biogeographic implications

Sclerophyllous evergreen broad-leaved forests, mainly made up of sclerophyllous oak, Quercus section Heterobalanus (Øerst.) Menitsky, Fagaceae, represent the most typical forest type in the Hengduan Mountains. Their distribution pattern is closely related to the growth and formation of the Qinghai-Tibetan Plateau (QTP). The oldest fossil record of Quercus sect. Heterobalanus so far discovered is from the middle Miocene of the Gazhacun Formation in Namling County, southern Tibet. However, our recent discovery of leaf fossils from the upper Eocene of Lawula Formation in Markam Basin, southeastern Tibet, illustrates that their origin is nearly 20 Myr older than previously assumed. By integrating the results from geometric morphometrics, geographical range expansion, and ecological niche shifts of this section in what is now the QTP and the Hengduan Mountains, we infer that the leaves of Quercus sect. Heterobalanus were already adapted to cool and dry conditions in some local regions no later than in the late Eocene. Then, with the growth of the QTP and late Cenozoic global cooling, the expansion of cooler and drier habitats benefited the spread and development of this section and their leaves exhibited morphological stasis through stabilizing selection. Based on published fossil records and recent discoveries, we argue that Quercus sect. Heterobalanus appeared in the subtropical evergreen and deciduous broad-leaved mixed forests of the southeastern margin of what is now the QTP no later than in the late Eocene. Some taxa spread westwards along the Gangdese Mountains and later the Himalaya, and others spread eastwards and southeastwards, gradually becoming a dominant group of species in the Hengduan Mountains. This dispersal route is contrary to the previous “northwards hypothesis” of this section, and further supports the hypothesis of an East Asian origin for Quercus section Ilex Loudon.

0 2022-03-23

Pliocene flora and paleoenvironment of Zanda Basin, Tibet, China

This paper describes a plant megafossil assemblage from the Pliocene strata of Xiangzi, Zanda Basin in the western Qinghai-Tibet Plateau. Twenty-one species belonging to 12 genera and 10 families were identified. Studies show that the Pliocene vegetation in Zanda Basin was mostly deciduous shrub composed of Cotoneaster, Spiraea, Caragana, Hippophae, Rhododendron, Potentilla fruticosa, etc. Leaf sizes of these taxa were generally small. Paleoclimate reconstruction using Coexistence Analysis and CLAMP showed that this area had higher temperature and precipitation in the Pliocene than today, and distinct seasonal precipitation variability was established. The reconstructed paleoelevation of Zanda Basin in the Pliocene was similar to modern times. In the context of central Asian aridification, the gradual drought in the area beginning in the late Cenozoic caused vegetation to transition from shrub to desert, and the flora composition also changed.

0 2022-03-23