Luminescence chronology of late Quaternary moraines and Last Glacial Maximum equilibrium-line altitude reconstruction from Parlung Zangbo Valley, south-eastern Tibetan Plateau

2014 ◽  
Vol 29 (6) ◽  
pp. 597-604 ◽  
Author(s):  
RENRONG CHEN ◽  
SHANGZHE ZHOU ◽  
ZHONGPING LAI ◽  
XIANJIAO OU ◽  
RONG CHEN ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Last Glacial Maximum ◽  
Late Quaternary ◽  
Glacial Maximum ◽  
Equilibrium Line ◽  
Eastern Tibetan Plateau ◽  
Equilibrium Line Altitude ◽  
Last Glacial ◽  
South Eastern

Marine Isotope Stage 3 paleotemperature inferred from reconstructing the Die Shan ice cap, northeastern Tibetan Plateau

2018 ◽  
Vol 89 (2) ◽  
pp. 494-504 ◽  
Author(s):  
Hang Cui ◽  
Jie Wang ◽  
Beibei Yu ◽  
Zhenbo Hu ◽  
Pan Yao ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Last Glacial Maximum ◽  
Glacial Maximum ◽  
Marine Isotope Stage ◽  
The Tibetan Plateau ◽  
Equilibrium Line Altitude ◽  
Last Glacial ◽  
Mis 3 ◽  
Ice Cap ◽  
Northeastern Tibetan Plateau

AbstractGlacial extent mapping and dating indicate that the local last glacial maximum (LLGM) of the northeastern Tibetan Plateau occurred during mid-Marine Isotope Stage (MIS) 3. This is asynchronous with the global last glacial maximum (LGM) that occurred during MIS 2. The causes underlying this asynchronicity are the subject of ongoing debate, and paleoclimatic reconstructions are a key to advancing understanding of the climatic influence on the spatial and temporal patterns of paleoglaciation. We used multiple methods to reconstruct the equilibrium-line altitude (ELA) of the Die Shan paleo-ice cap on the northeastern Tibetan Plateau, and to infer past temperature for ice maximum positions believed to be mid-MIS 3 in age, based on regional correlation. Geomorphic ELA reconstructions combined with an energy and mass balance model yield a paleo-ELA of 4117±31 m asl (786 m lower than present) with temperature depressions of 3.8 to ~4.6°C compared to the present. This is less than the LGM reconstruction of temperature depression inferred from other climatic proxy records on the Tibetan Plateau and suggests that the LLGM glacial advance was a product of lower temperatures and slightly reduced precipitation compared to present, whereas the LGM was a more restricted advance in which much colder conditions were combined with much lower precipitation.

Last Glacial Maximum equilibrium-line altitude trends and precipitation patterns in the Sangre de Cristo Mountains, southern Colorado, USA

Boreas ◽  
2009 ◽  
Vol 38 (4) ◽  
pp. 663-678 ◽  
Author(s):  
KURT A. REFSNIDER ◽  
KEITH A. BRUGGER ◽  
ERIC M. LEONARD ◽  
JAMES P. McCALPIN ◽  
PHILIP P. ARMSTRONG
Keyword(s):  
Last Glacial Maximum ◽  
Glacial Maximum ◽  
Equilibrium Line ◽  
Equilibrium Line Altitude ◽  
Precipitation Patterns ◽  
Last Glacial ◽  
Sangre De Cristo

Vegetation composition in Sanjiangyuan region compared with Hengduan Mountains (eastern Tibetan Plateau) since the Last Glacial Maximum revealed by plant metabarcoding of sedimentary ancient DNA

2021 ◽  
Author(s):  
Wei Shen ◽  
Sisi Liu ◽  
Kathleen R. Stoof-Leichsenring ◽  
Jeremy Courtin ◽  
Steffen Mischke ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Last Glacial Maximum ◽  
Beta Diversity ◽  
Glacial Maximum ◽  
Hengduan Mountains ◽  
Vegetation Composition ◽  
Eastern Tibetan Plateau ◽  
Last Glacial ◽  
The Last Glacial Maximum ◽  
The Last Glacial

<p>The eastern Tibetan Plateau, particularly the Hengduan Mountains and Sanjiangyuan region, is a biodiversity hotspot also known for its sensitivity to climate change. How these vegetation communities assembled since the Last Glacial Maximum is still unclear. Here we present new results from plant metabarcoding of sediments from Lake Ximencuo (Nianbaoyeze Mountains, Sanjiangyuan region) covering the last 18 ka and compare them with records from Lake Naleng (Hengduan Mountains).  We investigate temporal changes of within-site and between-site alpha and beta diversities. Both sites show the highest richness between 14 and 10 ka when alpine meadows covered the areas while richness was rather low in forested periods during the early Holocene. Ordination results support that the vegetation composition was relatively low between-site beta-diversities indicate that the vegetation composition was relatively similar in the two study areas before the Holocene, particularly during the early late-glacial when alpine steppes dominated. The maximal between-site beta-diversity occurred between 10 and 8 ka when environmental filtering was most relevant, as suggested by the dominating turnover component. The nestedness component of beta-diversity reached a maximum during the middle Holocene indicating that between-site differences during this period possibly originated from e.g., dispersal limitation.</p>

Last glacial maximum equilibrium-line altitude and paleo-temperature reconstructions for the Cordillera de Mérida, Venezuelan Andes

2007 ◽  
Vol 67 (1) ◽  
pp. 115-127 ◽  
Author(s):  
Nathan D. Stansell ◽  
Pratigya J. Polissar ◽  
Mark B. Abbott
Keyword(s):  
Last Glacial Maximum ◽  
Large Scale ◽  
Glacial Maximum ◽  
Equilibrium Line ◽  
Aerial Photographs ◽  
Lapse Rate ◽  
Current Debate ◽  
Equilibrium Line Altitude ◽  
Last Glacial ◽  
Accumulation Area Ratio

AbstractThe pattern and magnitude of glacier equilibrium-line altitude (ELA) lowerings in the tropics during the last glacial maximum (LGM) are topics of current debate. In the northern tropics, paleo-ELA data are particularly limited, inhibiting the ability to make regional and large-scale paleoclimatic inferences. To improve these records, nine paleo-glaciers in the Venezuelan Andes were reconstructed based on field observations, aerial photographs, satellite imagery and high-resolution digital topographic data. Paleo-glacier equilibrium-line altitudes (ELAs) were estimated using the accumulation-area ratio (AAR) and the area-altitude balance ratio (AABR) methods. During the local LGM in Venezuela (∼ 22,750 to 19,960 cal yr BP), ELAs were ∼ 850 to 1420 m lower than present. Local LGM temperatures were are at least 8.8 ± 2°C cooler than today based on a combined energy and mass-balance equation to account for an ELA lowering. This is greater than estimates using an atmospheric lapse rate calculation, which yields a value of 6.4 ± 1°C cooler. The paleo-glacial data from the Venezuelan Andes support other published records that indicate the northern tropics experienced a greater ELA lowering and possibly a greater cooling than the Southern Hemisphere tropics during the LGM.

Geomorphological record and equilibrium line altitude of glaciers during the last glacial maximum in the Rodna Mountains (eastern Carpathians)

2020 ◽  
pp. 1-20
Author(s):  
Piotr Kłapyta ◽  
Marcel Mîndrescu ◽  
Jerzy Zasadni
Keyword(s):  
Last Glacial Maximum ◽  
Glacial Maximum ◽  
Equilibrium Line ◽  
Surface Geometry ◽  
Equilibrium Line Altitude ◽  
Last Glacial ◽  
Eastern Carpathians ◽  
Glacial Stage ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract In the eastern Carpathians the legacy of glaciation is preserved in several isolated mountain massifs. This paper presents new mapping results of glaciated valley land systems in the Rodna Mountains, the highest part of the eastern Carpathians (2303 m above seal level). In most of the glacial valleys, the maximal Pleistocene extent is marked by freshly shaped moraines, which are referred in this study as the Pietroasa glacial stage and regarded as the last glacial maximum (LGM) advance. Only in three valleys do older Şesura glacial stage moraines (pre-LGM, likely Marine Oxygen Isotope Stage 6) occur. On the basis of the geomorphological record, we reconstruct the extent, surface geometry, and equilibrium line altitude (ELA) of Pietroasa-stage glaciers. The local ELA pattern of north-exposed glaciers in the Rodna Mountains shows a rising trend towards the southeast, which suggests dominant snow-bearing winds and orographically induced precipitation from the west. This finding fits well with the dominant palaeo-wind direction inferred from other Carpathian proxies and confirms the dominance of zonal circulation pattern during the global LGM in central eastern Europe.

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