Yumen conglomerate ages in the South Ningxia Basin, north‐eastern Tibetan Plateau, as constrained by cosmogenic dating

2019 ◽  
Vol 55 (11) ◽  
pp. 7138-7147 ◽  
Author(s):  
Wei Shi ◽  
Jianmin Hu ◽  
Peng Chen ◽  
Hong Chen ◽  
Yongchao Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Eastern Tibetan Plateau ◽  
The South ◽  
Cosmogenic Dating ◽  
North Eastern ◽  
Yumen Conglomerate

A high-resolution sedimentary archive from landslide-dammed Lake Mengda, north-eastern Tibetan Plateau

2012 ◽  
Vol 51 (2) ◽  
pp. 303-312 ◽  
Author(s):  
Yongbo Wang ◽  
Ulrike Herzschuh ◽  
Xingqi Liu ◽  
Oliver Korup ◽  
Bernhard Diekmann
Keyword(s):  
High Resolution ◽  
Tibetan Plateau ◽  
Eastern Tibetan Plateau ◽  
North Eastern ◽  
Dammed Lake

scholarly journals Fire, vegetation and Holocene climate in the south-eastern Tibetan Plateau: a multi-biomarker reconstruction from Paru Co

2018 ◽  
Author(s):  
Alice Callegaro ◽  
Felipe Matsubara Pereira ◽  
Dario Battistel ◽  
Natalie M. Kehrwald ◽  
Broxton W. Bird ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Biomass Burning ◽  
Fire History ◽  
Vegetation Changes ◽  
The Tibetan Plateau ◽  
Eastern Tibetan Plateau ◽  
The South ◽  
South Eastern ◽  
The Past ◽  
High Concentrations

Abstract. The fire history of the Tibetan Plateau over centennial to millennial timescales is still unknown. Recent ice core studies reconstruct fire history over the past few decades but do not extend through the Holocene. Lacustrine sedimentary cores, however, provide continuous records of large-scale and local environmental modifications due to their accumulation of specific organic molecular markers throughout the past millennia. In order to reconstruct Holocene fire events and vegetation changes occurring on the south-eastern Tibetan Plateau and the surrounding areas, we improved and integrated previous analytical methods. The multi-proxy procedure was applied to samples retrieved from Paru Co, a small lake located in the Nyainqentanglha Mountains (29°47'45.6" N; 92°21'07.2" E; 4845 m a.s.l.). The investigated biomarkers include n-alkanes as indicators of vegetation, polycyclic aromatic hydrocarbons (PAHs) as combustion proxies, faecal sterols and stanols (FeSts) as indicators of the presence of humans or grazing animals and finally monosaccharide anhydrides (MAs) as specific markers of vegetation burning processes. Relatively high concentrations of both MAs and PAHs demonstrate intense local biomass burning activity during the early Holocene (10.9–10.7 cal ky BP), which correspond to a drier climate following deglaciation. High concentrations of MAs but not PAHs between 10.7–9 cal ky BP suggest a period of regional biomass burning followed by a decreasing fire trend through the mid-late Holocene. This fire history is consistent with local vegetation changes reconstructed from both n-alkanes and regional pollen records, where vegetation types depend on the centennial-scale intensity of monsoon precipitation. FeSts were below detection limits for most of the samples, suggesting limited direct human influences on fire regime and vegetation changes in the lake's catchment. Climate is the main influence on fire activity recorded in Paru Co over millennial timescales, where biomass burning fluctuates in response to alternating warm/humid and cool/dry periods.

scholarly journals Cryoconite on a glacier on the north-eastern Tibetan plateau: light-absorbing impurities, albedo and enhanced melting

2019 ◽  
Vol 65 (252) ◽  
pp. 633-644 ◽  
Author(s):  
YANG LI ◽  
SHICHANG KANG ◽  
FANGPING YAN ◽  
JIZU CHEN ◽  
KUN WANG ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Mass Balance ◽  
Glacier Mass Balance ◽  
Eastern Tibetan Plateau ◽  
The North ◽  
Ice Surface ◽  
Northern Tibetan Plateau ◽  
North Eastern ◽  
The Mean

ABSTRACTCryoconite is a dark-coloured granular sediment that contains biological and mineralogical components, and it plays a pivotal role in geochemistry, carbon cycling and glacier mass balance. In this work, we collected cryoconite samples from Laohugou Glacier No. 12 (LHG) on the north-eastern Tibetan Plateau during the summer of 2015 and measured the spectral albedo. To explore the impacts of this sediment on surface ablation, the ice melting differences between the cryoconite-free (removed) ice and the intact layers were compared. The results showed that the mean concentrations of black carbon (BC), organic carbon (OC) and total iron (Fe) in the LHG cryoconite were 1.28, 11.18 and 39.94 mg g−1, respectively. BC was found to play a stronger role in solar light adsorption than OC and free Fe. In addition, ice covered by cryoconite exhibited the lowest mean reflectance (i.e., <0.1). Compared with the cryoconite-free ice surface, cryoconite effectively absorbed solar energy and enhanced glacial melting at a rate of 2.27–3.28 cm d−1, and free Fe, BC and OC were estimated to contribute 1.01, 0.99 and 0.76 cm d−1, respectively. This study provides important insights for understanding the role of cryoconite in the glacier mass balance of the northern Tibetan Plateau.

scholarly journals Geomorphic expressions of collisional tectonics in the Qilian Shan, north eastern Tibetan Plateau

2020 ◽  
Vol 788 ◽  
pp. 228503
Author(s):  
Katharine Groves ◽  
Christopher Saville ◽  
Martin D. Hurst ◽  
Stuart J. Jones ◽  
Shuguang Song ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Eastern Tibetan Plateau ◽  
North Eastern

Wind erosion on the north-eastern Tibetan Plateau: constraints from OSL and U-Th dating of playa salt crust in the Qaidam Basin

2013 ◽  
Vol 39 (6) ◽  
pp. 779-789 ◽  
Author(s):  
Wenxia Han ◽  
Zhibang Ma ◽  
Zhongping Lai ◽  
Erwin Appel ◽  
Xiaomin Fang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Wind Erosion ◽  
Qaidam Basin ◽  
Eastern Tibetan Plateau ◽  
The North ◽  
Salt Crust ◽  
North Eastern
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