scholarly journals A preliminary study on the lithospheric thermal structure and rheology of the Tibetan plateau

2012 ◽  
Vol 25 (5-6) ◽  
pp. 399-408
Author(s):  
Yang Wang
Keyword(s):  
Tibetan Plateau ◽  
Thermal Structure ◽  
The Tibetan Plateau ◽  
Preliminary Study ◽  
Lithospheric Thermal Structure

scholarly journals The effect of low density over the “roof of the world” Tibetan Plateau on the triggering of convection

2019 ◽  
Author(s):  
Yinjun Wang ◽  
Xiangde Xu ◽  
Mingyu Zhou ◽  
Donald H. Lenschow ◽  
Xueliang Guo ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Tibetan Plateau ◽  
Thermal Structure ◽  
Cloud Formation ◽  
The Tibetan Plateau ◽  
Climate Data ◽  
Eddy Simulation ◽  
Thermal Turbulence ◽  
Air Density ◽  
Low Cloud

Abstract. We study the relationships between convective characteristics and air density over the Tibetan Plateau (TP) from the perspective of both climate statistics and large eddy simulation (LES). First, based on climate data, we found that there is stronger thermal turbulence and higher frequency of low cloud formation for the same surface relative humidity over the eastern and central TP compared with the eastern monsoon region of China. Second, we focus on the dynamical and thermal structure of the atmospheric boundary layer (ABL) with low air density. With the same surface heat flux, a decrease in air density enhances the buoyancy flux, which increases the ABL depth and moisture transport from the subcloud layer into the cloud layer. With the same low cloud cover for different air densities, the greater ABL depth for lower air density means that the average mixed-layer relative humidity with higher air density will be greater than that with low air density. Results from a subcloud convective velocity scaling scheme were compared with LES results, which indicated that the original fixed parameter values in this scheme may not adequate in case of lower relative humidity and weaker thermal turbulence in the subcloud layer.

Vegetation and ocean feedbacks on the Asian climate response to the uplift of the Tibetan Plateau

2020 ◽  
Author(s):  
Ran Zhang ◽  
Dabang Jiang ◽  
Zhongshi Zhang
Keyword(s):  
Tibetan Plateau ◽  
Thermal Structure ◽  
Winter Monsoon ◽  
Annual Precipitation ◽  
The Tibetan Plateau ◽  
Climate Response ◽  
Vegetation Feedback ◽  
Asian Winter Monsoon ◽  
Community Earth System Model ◽  
Monsoon Winds

<p>The growth of the Tibetan Plateau (TP) is one of the important forcings acting on the evolution of the Asian climate during the Cenozoic. However, whether vegetation and ocean feedbacks play a specific role in the Asian climate response to TP uplift remains unclear. Here we investigate this issue through a set of numerical experiments with the Community Earth System Model. The results indicate that vegetation and ocean feedbacks have important but different effects on the Asian climate change in association with TP uplift, which are intrinsically related to the adjustment of thermal structure. The vegetation feedback leads to excess annual precipitation in East China and South Asia and a weakening of the Asian winter monsoon winds. By comparison, the ocean feedback induces a deficit of annual precipitation particularly in most areas of the Bay of Bengal and the South China Sea and a weakening of the Asian summer and winter monsoon winds. These results highlight the importance of vegetation and ocean feedbacks and further facilitate a better understanding of the paleoclimatic response to the uplift of the TP.</p>

Preliminary study of crust-upper mantle structure of the Tibetan Plateau by using broadband teleseismic body waveforms

1993 ◽  
Vol 6 (2) ◽  
pp. 305-316 ◽  
Author(s):  
Lu-Pei Zhu ◽  
Rong-Sheng Zeng ◽  
Francis T. Wu ◽  
Thomas J. Owens ◽  
George E. Randall
Keyword(s):  
Tibetan Plateau ◽  
Upper Mantle ◽  
The Tibetan Plateau ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Preliminary Study

scholarly journals A Preliminary Study of the Heating Effect of the Tibetan Plateau

PLoS ONE ◽  
2013 ◽  
Vol 8 (7) ◽  
pp. e68750 ◽  
Author(s):  
Yonghui Yao ◽  
Baiping Zhang
Keyword(s):  
Tibetan Plateau ◽  
The Tibetan Plateau ◽  
Heating Effect ◽  
Preliminary Study

scholarly journals Contrasting hydrological and thermal intensities determine seasonal lake-level variations – a case study at Paiku Co on the southern Tibetan Plateau

2021 ◽  
Vol 25 (6) ◽  
pp. 3163-3177
Author(s):  
Yanbin Lei ◽  
Tandong Yao ◽  
Kun Yang ◽  
Yaoming Ma ◽  
Broxton W. Bird ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Lake Level ◽  
Thermal Structure ◽  
Monsoon Season ◽  
Seasonal Pattern ◽  
The Tibetan Plateau ◽  
Post Monsoon ◽  
Level Increase ◽  
Post Monsoon Season ◽  
Lake Evaporation

Abstract. Evaporation from hydrologically closed lakes is one of the largest components of the lake water budget; however, its effects on seasonal lake-level variations remain unclear on the Tibetan Plateau (TP) due to a lack of comprehensive observations. In this study, weekly lake evaporation and its effects on seasonal lake-level variations are investigated at Paiku Co on the southern TP using in situ observations of thermal structure and hydrometeorology (2015–2018). Lake evaporation from Paiku Co was estimated to be 975±142 mm during the ice-free period (May to December), characterized by low values of 1.7 ± 0.6 mm d−1 during the pre-monsoon season (May to June), high values of 5.5±0.6 mm d−1 during the post-monsoon season (October to December), and intermediate values of 4.0±0.6 mm d−1 during the monsoon season (July to September). There was a ∼ 5-month lag between the maximum net radiation (June) and maximum lake evaporation (November). These results indicate that the seasonal pattern of lake evaporation from Paiku Co was significantly affected by the large lake heat storage. Contrasting hydrological and thermal intensities may play an important role in the large amplitude of seasonal lake-level variations at deep lakes like Paiku Co. High inflow from monsoon precipitation and glacier melting and moderate lake evaporation, for instance, drove rapid lake-level increase during the monsoon season. In contrast, high lake evaporation and reduced inflow caused lake level to decrease significantly during the post-monsoon season. This study implies that lake evaporation may play an important role in the different amplitudes of seasonal lake-level variations on the TP.

Characteristics and Mechanism of the 10–20-Day Oscillation of Spring Rainfall over Southern China

2013 ◽  
Vol 26 (14) ◽  
pp. 5072-5087 ◽  
Author(s):  
Weijuan Pan ◽  
Jiangyu Mao ◽  
Guoxiong Wu
Keyword(s):  
Tibetan Plateau ◽  
Southern China ◽  
Thermal Structure ◽  
Wave Train ◽  
Lower Troposphere ◽  
Rain Gauge ◽  
Department Of Energy ◽  
The Tibetan Plateau ◽  
Driving Mechanisms ◽  
Intraseasonal Oscillations

Abstract The intraseasonal oscillations (ISOs) of southern China spring rainfall (SCSR) are examined based on daily rain gauge rainfall data and NCEP/Department of Energy Reanalysis 2 (NCEP-2) products for the period 1980–2008. The objective of this study is to reveal the structure and propagation of the dominant ISO of SCSR as well as its driving mechanisms, thereby gaining an understanding of the causes of extreme wet and dry SCSR. The EOF analysis and power spectrum analysis show that the 10–20-day oscillation is a predominant ISO of SCSR in most years. Composite analyses and wave-activity propagation diagnosis demonstrate that the 10–20-day oscillation of SCSR is characterized by an alternate occurrence of a huge anomalous anticyclone (cyclone) encircling the Tibetan Plateau in the lower troposphere, with anomalous low-level northeasterly (southwesterly) winds prevailing over southern China, producing lower-tropospheric divergence (convergence). In the middle and upper troposphere, the oscillation appears as a southeastward propagating coherent wave train made up of a series of anomalous cyclones and anticyclones, which are aligned in a northwest–southeast direction. This whole wave train also drifts eastward, with strong upper-tropospheric convergence (divergence) alternately superimposed over the lower-tropospheric divergence (convergence) within and south of the Yangtze basin, resulting in deficient (excessive) rainfall in southern China. The thermal structure of the 10–20-day ISO of SCSR and its association with the mechanical–thermal forcing of the Tibetan Plateau are also explored.

The impact of convective overshooting on the thermal structure over the Tibetan Plateau in summer based on TRMM, COSMIC, radiosonde and reanalysis data

2021 ◽  
pp. 1-57
Author(s):  
Nan Sun ◽  
Yunfei Fu ◽  
Lei Zhong ◽  
Chun Zhao ◽  
Rui Li
Keyword(s):  
Tibetan Plateau ◽  
Thermal Structure ◽  
Tropical Rainfall Measuring Mission ◽  
Reanalysis Data ◽  
The Tibetan Plateau ◽  
Temperature Profiles ◽  
Spatiotemporal Resolution ◽  
Weather Forecasts ◽  
High Vertical Resolution ◽  
The Impact

AbstractIn this paper, we examine convective overshooting and its effects on the thermal structure of the troposphere and lower stratosphere in the Tibetan Plateau in summer by matching the Tropical Rainfall Measuring Mission (TRMM) with Integrated Global Radiosonde Archive (IGRA), Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC), European Centre for Medium-Range Weather Forecasts 5th Reanalysis (ERA-5), the Japanese Meteorological Association 55-year reanalysis (JRA-55) and the National Aeronautics and Space Administration Modern-Era Retrospective analysis for Research and Applications, Versions2 (MERRA-2). It was found that convective overshooting mainly occurs in the central and eastern part of the Tibetan Plateau, and its frequency varies from 0.01 × 10−4 to 0.91 × 10−4. The convective overshooting warms the low middle tropopause and cools the tropopause nearby significantly, which can also makes air get wetter. The tropopause of the convective overshooting is substantially lower than the mean tropopause. Statistical results calculated from the five datasets are generally consistent; however, each dataset has its own strengths and weaknesses. The high spatiotemporal resolution temperature profiles from ERA-5 along with the high vertical resolution temperature profiles from COSMIC can be combined to accurately study convective overshooting in the Tibetan Plateau.

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