Review of the Manuscript : Effects of Stratified Active Layers on the High-Altitude Permafrost Warming: A Case Study on the Qinghai-Tibet Plateau

2016 ◽  
Author(s):  
Anonymous
Keyword(s):  
High Altitude ◽  
Tibet Plateau ◽  
Active Layers ◽  
Permafrost Warming ◽  
Qinghai Tibet Plateau

scholarly journals Effects of Stratified Active Layers on the High-Altitude Permafrost Warming: A Case Study on the Qinghai-Tibet Plateau

2016 ◽  
Author(s):  
X. Pan ◽  
Y. Li ◽  
Q. Yu ◽  
X. Shi ◽  
D. Yang ◽  
...  
Keyword(s):  
Thermal State ◽  
Liquid Water Content ◽  
Variable Thermal Conductivity ◽  
Tibet Plateau ◽  
Soil Hydraulic Properties ◽  
Temperature And Precipitation ◽  
Active Layers ◽  
Permafrost Warming ◽  
Qinghai Tibet Plateau

Abstract. Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably smaller in the thawed than in the frozen state, λt/λf < 1. Using a 9-year dataset from the Qinghai-Tibet Plateau (QTP) in conjunction with the GEOtop model, we demonstrate that the ratio λt/λf may approach or even exceed 1. This can happen in thick active layers, with thicknesses larger than some 1.5 m, with strong seasonal liquid water content changes. It is additionally furthered by typical soil architectures that may lead to a dry inter-layer. These findings suggest that, given the increase in air temperature and precipitation, soil hydraulic properties, particularly soil architecture in those thick active layers must be taken into account properly in permafrost models.

scholarly journals Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau

2016 ◽  
Vol 10 (4) ◽  
pp. 1591-1603 ◽  
Author(s):  
Xicai Pan ◽  
Yanping Li ◽  
Qihao Yu ◽  
Xiaogang Shi ◽  
Daqing Yang ◽  
...  
Keyword(s):  
Thermal State ◽  
Variable Thermal Conductivity ◽  
Tibet Plateau ◽  
Precipitation Pattern ◽  
Thermal Dynamics ◽  
Temperature And Precipitation ◽  
Active Layers ◽  
Permafrost Warming ◽  
Soil Hydraulic ◽  
Qinghai Tibet Plateau

Abstract. Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably lower in the thawed than in the frozen state, λt/λf < 1. Using a 9-year dataset from the Qinghai–Tibet Plateau (QTP) in conjunction with the GEOtop model, we demonstrate that the ratio λt/λf may approach or even exceed 1. This can happen in thick (> 1.5 m) active layers with strong seasonal total water content changes in the regions with summer-monsoon-dominated precipitation pattern. The conductivity ratio can be further increased by typical soil architectures that may lead to a dry interlayer. The unique pattern of soil hydraulic and thermal dynamics in the active layer can be one important contributor for the rapid permafrost warming at the study site. These findings suggest that, given the increase in air temperature and precipitation, soil hydraulic properties, particularly soil architecture in those thick active layers must be properly taken into account in permafrost models.

A Research on the Planning Strategy of Eco-Demonstration Zones in High Altitude Areas — a Case Study of Tanggula Town

2011 ◽  
Vol 368-373 ◽  
pp. 1632-1637
Author(s):  
Jin Wang ◽  
De Gang Duan ◽  
Jie Shen
Keyword(s):  
Land Use ◽  
High Altitude ◽  
Small Towns ◽  
Positive Influence ◽  
Living Environment ◽  
Tibet Plateau ◽  
Planning Strategy ◽  
Development Direction ◽  
Qinghai Tibet Plateau

The unruled development of construction land, along with the disordered planning and deteriorating living environment, etc. has long been prevalent in those small towns in the Qinghai- Tibet Plateau. This paper, thus, conducts some on-the-spot investigations and analyses of Tanggula town. The paper departs from the disparities between the current conditions of Tanggula town and the standards of eco- demonstration zone, proposing some strategies in the aspects of development direction, land use layout, facility layout, architecture and the town's features, aiming to exert positive influence upon the planning of small towns in plateaux.

scholarly journals Distribution and characteristics of large landslides in a fault zone: a case study of the NE Qinghai-Tibet Plateau

Geomorphology ◽  
2021 ◽  
pp. 107592
Author(s):  
Tianjun Qi ◽  
Xingmin Meng ◽  
Feng Qing ◽  
Yan Zhao ◽  
Wei Shi ◽  
...  
Keyword(s):  
Fault Zone ◽  
Tibet Plateau ◽  
Qinghai Tibet Plateau

scholarly journals Air–surface exchange of gaseous mercury over permafrost soil: an investigation at a high-altitude (4700 m a.s.l.) and remote site in the central Qinghai-Tibet Plateau

2016 ◽  
Author(s):  
Zhijia Ci ◽  
Fei Peng ◽  
Xian Xue ◽  
Xiaoshan Zhang
Keyword(s):  
High Altitude ◽  
Field Experiments ◽  
Tibet Plateau ◽  
Permafrost Soil ◽  
Remote Site ◽  
Water Addition ◽  
Surface Exchange ◽  
Entire Study ◽  
Gaseous Mercury ◽  
Qinghai Tibet Plateau

Abstract. The pattern of air–surface gaseous mercury (mainly Hg(0)) exchange in the Qinghai-Tibet Plateau (QTP) may be unique because this region is characterized by low temperature, great temperature variation, intensive solar radiation, and pronounced freeze-thaw process of permafrost soils. However, air–surface Hg(0) flux in the QTP is poorly investigated. In this study, we performed filed measurements and controlled field experiments with dynamic flux chambers technique to examine the flux, temporal variation and influencing factors of air–surface Hg(0) exchange at a high-altitude (4700 m a.s.l.) and remote site in the central QTP. The results of field measurements showed that surface soils were net emission source of Hg(0) in the entire study. Hg(0) flux showed remarkable seasonality with net high emission in the warm campaigns and net low deposition in winter campaign, and also showed the diurnal pattern with emission in daytime and deposition in nighttime, especially on days without precipitation. Rainfall events on the dry soils induced large and immediate increase in Hg(0) emission. Snowfall events did not induce the pulse of Hg(0) emission, but snow melt resulted in the immediate increase in Hg(0) emission. Daily Hg(0) fluxes on rainy or snowy days were higher than those of days without precipitation. Controlled field experiments suggested that water addition to dry soils significantly increased Hg(0) emission both in short and relatively long timescales, and also showed that UV radiation was primarily attributed to Hg(0) emission in the daytime. Our findings imply that a warm climate and environmental change could facilitate Hg release from the permafrost terrestrial ecosystem in the QTP.

Resolving the energy restriction at high altitude: variation in the digestive system of Phrynocephalus vlangalii

2020 ◽  
Vol 70 (3) ◽  
pp. 321-331
Author(s):  
Yang yang Zhao ◽  
Yue Qi ◽  
Xiao ning Wang ◽  
Wei Zhao
Keyword(s):  
High Altitude ◽  
Digestive Tract ◽  
Native Species ◽  
Morphological Structure ◽  
Histological Change ◽  
Energy Restriction ◽  
Tibet Plateau ◽  
Argyrophil Cells ◽  
Energy Limitation ◽  
Qinghai Tibet Plateau

Abstract Hypothermic and hypoxic environments create strong selective pressure on native species by affecting, among other things, the relationship between energy intake and allocation. In order to detect the adaptation of Phrynocephalus vlangalii to such energy limitation, the morphological structure and argyrophil cells of the digestive tract of 80 individuals from two different altitudes in the Qinghai-Tibet Plateau were compared using overall anatomy as well as paraffin sectioning of specific organs. Compared with the low-altitude population, the high-altitude individuals were found to have a significantly longer stomach and duodenum, longer and wider villus in the small intestine, larger surface area in duodenum and jejunum, and more argyrophilic cells in stomach and duodenum. Our results indicate that the morphological and histological change of the digestive tract may be conductive to the plateau adaptability of P. vlangalii by enhancing the efficiency of digestion and absorption. For a more general conclusion to be drawn, comparison of more populations at both altitudes is required in addition to verifying how phenotypically flexible these traits are.

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