Control of the Interactions between Stream and Groundwater by Permafrost and Seasonal Frost in an Alpine Catchment, Northeastern Tibet Plateau, China

2021 ◽  
Author(s):  
Rui Ma ◽  
Ziyong Sun ◽  
Qixin Chang ◽  
Mengyan Ge ◽  
Zhao Pan
Keyword(s):  
Tibet Plateau ◽  
Northeastern Tibet

A restudy of the Sandbian to Katian (Upper Ordovician) graptolites from the East Qilianshan (Chilianshan), Northwest China

2019 ◽  
Vol 93 (06) ◽  
pp. 1175-1209
Author(s):  
Xu Chen ◽  
Zhongyang Chen ◽  
Charles E. Mitchell ◽  
Qing Chen ◽  
Linna Zhang
Keyword(s):  
South China ◽  
Endemic Species ◽  
New Genus ◽  
Northwest China ◽  
Tibet Plateau ◽  
Upper Ordovician ◽  
Northeastern Tibet ◽  
High Diversity

AbstractThe Upper Ordovician Sandbian to Katian strata from the East Qilianshan (northeastern Tibet Plateau) bear a graptolite fauna of moderately high diversity. Graptolites from the Amplexograptus maxwelli beds to the Appendispinograptus longispinus Biozone (Sa2–Ka4 intervals) proposed herein include 27 species of 13 genera. This important graptolite fauna is first described herein although it was initially reported in 1963. Most of them occur in the A. longispinus Biozone corresponding to the Dicellograptus complexus to Paraorthograptus pacificus biozones of the Wufeng Formation in the Yangtze region. Alulagraptus new genus is established based on the materials from the East Qiqiaogou section. The endemic species, e.g., Alulagraptus ensiformis (Mu and Zhang in Mu et al., 1963), Dicellograptus sinicus Mu and Zhang in Mu et al., 1963, and Climacograptus? papilio Mu and Zhang in Mu et al., 1963, could indicate that East Qilianshan block was separated from South China.UUID: http://zoobank.org/84ab69a2-0b56-4ec3-912e-730da08ab10a

scholarly journals Precipitation measurement intercomparison in the Qilian Mountains, Northeastern Tibetan Plateau

2015 ◽  
Vol 9 (2) ◽  
pp. 2201-2230 ◽  
Author(s):  
R. Chen ◽  
J. Liu ◽  
E. Kang ◽  
Y. Yang ◽  
C. Han ◽  
...  
Keyword(s):  
Wind Speed ◽  
Tibet Plateau ◽  
Wind Speeds ◽  
Northeastern Tibet ◽  
Precipitation Measurement ◽  
Combined Use ◽  
The Qilian Mountains ◽  
Precipitation Gauge ◽  
Chinese Standard ◽  
Calibration Equations

Abstract. Systematic errors in gauge-measured precipitation are well-known but no reports have come from the Tibet Plateau. An intercomparison experiment was carried out from September 2010 to September 2014 in the Hulu watershed, northeastern Tibet Plateau. Precipitation gauges included a Chinese standard precipitation gauge (CSPG), a CSPG with Alter shelter (Alter), a Pit type gauge with the CSPG (Pit) and a Double-Fence International Reference with Tretyakov shelter and CSPG (DFIR). The intercomparison experiments show that the Pit gauge caught 1% more rainfall, 2% more mixed precipitation, 4% less snowfall and 0.8% more precipitation (all types) than the DFIR from September 2012 to September 2014. The Pit caught 4% more rainfall, 21% more snow and 16% more mixed precipitation than the CSPG. The DFIR caught 3% more rainfall, 27% more snowfall, and 13% more mixed precipitation than the CSPG, respectively. For rain and mixed precipitation, the catch ratios (CRs) for the gauges are ranked as follows: CRPit > CRDFIR > CRAlter > CRCSPG. For snowfall, the CRs are ranked as follows: CRDFIR > CRPit > CRAlter > CRCSPG. Catch ratio vs. 10 m wind speed indicates that with increasing wind speed from 0 to 4.5 m s−1, the CRCSPG or CRAlter decreased slightly. For mixed precipitation, the ratios of DFIR/Alter or DFIR/Pit vs. wind speed show that wind speed has no significant effect on catch ratio below 3.5 m s−1. For snowfall, the ratio of CSPG/DFIR or Alter/DFIR vs. wind speed shows that catch ratio decreases with increasing wind speed. The calibration equations for three different precipitation types for the CSPG and Alter were established with 10 m wind speeds based on the CR vs. wind speed analysis. Results indicate that combined use of the DFIR and the Pit as reference gauges for snow and rainfall, respectively, could enhance precipitation observation precision. Applicable regions for the Pit gauge or the DFIR as representative gauges for all precipitation types are present in China.

Clinical features of gastric cancer in Tibet plateau region: an analysis of 237 cases

2013 ◽  
Vol 33 (8) ◽  
pp. 928-928
Author(s):  
Zeng DAN ◽  
Kang LI ◽  
Xiao-bo LIU ◽  
Yong-ge ZE ◽  
Zha-xi BIANBA
Keyword(s):  
Gastric Cancer ◽  
Clinical Features ◽  
Tibet Plateau ◽  
Plateau Region

scholarly journals Large-Scale Analysis of the Spatiotemporal Changes of Net Ecosystem Production in Hindu Kush Himalayan Region

2021 ◽  
Vol 13 (6) ◽  
pp. 1180
Author(s):  
Da Guo ◽  
Xiaoning Song ◽  
Ronghai Hu ◽  
Xinming Zhu ◽  
Yazhen Jiang ◽  
...  
Keyword(s):  
Large Scale ◽  
Net Primary Production ◽  
Carbon Sink ◽  
Carbon Sources ◽  
Spatial Dynamics ◽  
Tibet Plateau ◽  
Geostatistical Model ◽  
Hindu Kush ◽  
Temporal And Spatial ◽  
The Difference

The Hindu Kush Himalayan (HKH) region is one of the most ecologically vulnerable regions in the world. Several studies have been conducted on the dynamic changes of grassland in the HKH region, but few have considered grassland net ecosystem productivity (NEP). In this study, we quantitatively analyzed the temporal and spatial changes of NEP magnitude and the influence of climate factors on the HKH region from 2001 to 2018. The NEP magnitude was obtained by calculating the difference between the net primary production (NPP) estimated by the Carnegie–Ames Stanford Approach (CASA) model and the heterotrophic respiration (Rh) estimated by the geostatistical model. The results showed that the grassland ecosystem in the HKH region exhibited weak net carbon uptake with NEP values of 42.03 gC∙m−2∙yr−1, and the total net carbon sequestration was 0.077 Pg C. The distribution of NEP gradually increased from west to east, and in the Qinghai–Tibet Plateau, it gradually increased from northwest to southeast. The grassland carbon sources and sinks differed at different altitudes. The grassland was a carbon sink at 3000–5000 m, while grasslands below 3000 m and above 5000 m were carbon sources. Grassland NEP exhibited the strongest correlation with precipitation, and it had a lagging effect on precipitation. The correlation between NEP and the precipitation of the previous year was stronger than that of the current year. NEP was negatively correlated with temperature but not with solar radiation. The study of the temporal and spatial dynamics of NEP in the HKH region can provide a theoretical basis to help herders balance grazing and forage.

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