Mid-Permian rifting in Central China: Record of geochronology, geochemistry and Sr–Nd–Hf isotopes of bimodal magmatism on NE Qinghai–Tibetan Plateau

2018 ◽  
Vol 57 ◽  
pp. 77-89 ◽  
Author(s):  
Lu Zeng ◽  
Kai-Jun Zhang ◽  
Xian-Chun Tang ◽  
Yu-Xiu Zhang ◽  
Zhi-Wu Li
Keyword(s):  
Tibetan Plateau ◽  
Central China ◽  
Hf Isotopes

Roles of Anomalous Tibetan Plateau Warming on the Severe 2008 Winter Storm in Central-Southern China

2010 ◽  
Vol 138 (6) ◽  
pp. 2375-2384 ◽  
Author(s):  
Qing Bao ◽  
Jing Yang ◽  
Yimin Liu ◽  
Guoxiong Wu ◽  
Bin Wang
Keyword(s):  
Tibetan Plateau ◽  
General Circulation ◽  
Extreme Event ◽  
Southern China ◽  
Inversion Layer ◽  
Circulation Model ◽  
Central China ◽  
The Tibetan Plateau ◽  
Freezing Rain ◽  
Mean Sea Surface

Abstract Anomalous warming occurred over the Tibetan Plateau (TP) before and during the disastrous freezing rain and heavy snow hitting central and southern China in January 2008. The relationship between the TP warming and this extreme event is investigated with an atmospheric general circulation model. Two perpetual runs were performed. One is forced by the climatological mean sea surface temperatures in January as a control run; and the other has the same model setting as the control run except with an anomalous warming over the TP that mimics the observed temperature anomaly. The numerical results demonstrate that the TP warming induces favorable circulation conditions for the occurrence of this extreme event, which include the deepened lower-level South Asian trough, the enhanced lower-level southwesterly moisture transport in central-southern China, the lower-level cyclonic shear in the southerly flow over southeastern China, and the intensified Middle East jet stream in the middle and upper troposphere. Moreover, the anomalous TP warming results in a remarkable cold anomaly near the surface and a warm anomaly aloft over central China, forming a stable stratified inversion layer that favors the formation of the persistent freezing rain. The possible physical linkages between the TP warming and the relevant resultant circulation anomalies are proposed. The potential reason of the anomalous TP warming during the 2007–08 winter is also discussed.

scholarly journals Origin and radiative forcing of black carbon transported to the Himalayas and Tibetan Plateau

2010 ◽  
Vol 10 (9) ◽  
pp. 21615-21651 ◽  
Author(s):  
M. Kopacz ◽  
D. L. Mauzerall ◽  
J. Wang ◽  
E. M. Leibensperger ◽  
D. K. Henze ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Tibetan Plateau ◽  
Black Carbon ◽  
Radiative Forcing ◽  
Middle Eastern ◽  
Central China ◽  
The Tibetan Plateau ◽  
Adjoint Sensitivity ◽  
Snow Albedo ◽  
Northern Tibetan Plateau

Abstract. The remote and high elevation regions of central Asia are influenced by black carbon (BC) emissions from a variety of locations. BC deposition contributes to melting of glaciers and questions exist, of both scientific and policy interest, as to the origin of the BC reaching the glaciers. We use the adjoint of the GEOS-Chem model to identify the location from which BC arriving at a variety of locations in the Himalayas and Tibetan Plateau originates. We then calculate its direct and snow-albedo radiative forcing. We analyze the seasonal variation in the origin of BC using an adjoint sensitivity analysis, which provides a detailed map of the location of emissions that directly contribute to black carbon concentrations at receptor locations. We find that emissions from northern India and central China contribute the majority of BC to the Himalayas, although the precise location varies with season. The Tibetan Plateau receives most BC from western and central China, as well as from India, Nepal, the Middle East, Pakistan and other countries. The magnitude of contribution from each region varies with season and receptor location. We find that sources as varied as African biomass burning and Middle Eastern fossil fuel combustion can significantly contribute to the BC reaching the Himalayas and Tibetan Plateau. We compute radiative forcing in the snow-covered regions and estimate the forcing due to the BC induced snow-albedo effect at about 5–15 W m−2 within the region, an order of magnitude larger than radiative forcing due to the direct effect, and with significant seasonal variation in the northern Tibetan Plateau. Radiative forcing from reduced snow albedo accelerates glacier melting. Our analysis can help inform mitigation efforts to slow the rate of glacial melt by identifying regions that make the largest contributions to BC deposition in the Himalayas and Tibetan Plateau.

Geochronology, geochemistry, and Hf isotopes of the Jiudinggou molybdenum deposit, Central China, and their geological significance

2015 ◽  
Vol 49 (4) ◽  
pp. 321-342 ◽  
Author(s):  
Yunhui Zhang ◽  
Shouting Zhang ◽  
Mo Xu ◽  
Xingkui Jiang ◽  
Junjun Li ◽  
...  
Keyword(s):  
Central China ◽  
Hf Isotopes ◽  
Geological Significance ◽  
Molybdenum Deposit

scholarly journals Channel Profile Response to Abrupt Increases in Mountain Uplift Rates: Implications for Late Miocene to Pliocene Acceleration of Intracontinental Extension in the Northern Qinling Range-Weihe Graben, Central China

Lithosphere ◽  
2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Yizhou Wang ◽  
Dewen Zheng ◽  
Huiping Zhang ◽  
Jingxing Yu ◽  
Jianzhang Pang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Late Miocene ◽  
Central China ◽  
Normal Faults ◽  
The Tibetan Plateau ◽  
Uplift Rates ◽  
Channel Steepness ◽  
Ne Tibetan Plateau ◽  
Weihe Graben ◽  
Tectonic Forcing

Abstract Cenozoic extension of the Qinling range-Weihe Graben system has occurred in response to the uplift and growth of the Tibetan Plateau. Rapid exhumation of the northern Qinling range since the late Miocene is also regarded as resulting from the eastward expansion of the northeast part of Tibet. Tectonic evidence of this in the landscape remains unclear, but the fluvial system can provide a sensitive proxy record of tectonic forcing through space and over time scales of 105–107 a. Here, we present a study of channel profiles in the northern Qinling range, which forms a footwall highland separated from the southern Weihe Graben by active normal faults. We identify a population of knickpoints that separate river profiles with a gentle upstream gradient from steeper downstream reaches. Above the knickpoints, steepness indices increase from the central part towards the west and east, whereas channel steepness shows its highest values in the Huaxian-Huayin section. We observed no systematic changes of channel steepness pattern as a function of rock resistance, drainage area, or channel concavity. Correlation analysis between channel steepness and basin elevation and relief documents the control of tectonic forcing on regional topography. While bearing no relation to geological outcrop boundaries, the knickpoints show a strong correlation between retreat distance, catchment area, and river length. We infer that the knickpoints formed in response to an increase in mountain uplift rates and retreated as a kinematic wave. Under linear slope exponent n, we calibrated channel erodibility K~1.00±0.44×10−6 m0.1/a and derived knickpoint ages of 5.59±1.80 Ma. Combining the ages of onset of active faulting and mountain growth in the NE Tibetan Plateau (8–10 Ma, e.g., Liupan Shan, Jishi Shan, and eastern segments of the Haiyuan and Kunlun faults) and in the southwest Qinling range (9–4 Ma), we conclude that growth of the NE Tibetan Plateau began in the mid-Miocene time and expanded eastwards to the Qinling range-Weihe Graben during the late Miocene and early Pliocene.

Effect of springtime thermal forcing over Tibetan Plateau on summertime ozone in Central China during the period 1950–2019

2021 ◽  
pp. 105735
Author(s):  
Yuexuanzi Wang ◽  
Yingying Yan ◽  
Kunyu Duan ◽  
Shaofei Kong ◽  
Jintai Lin ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Central China ◽  
Thermal Forcing
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