Cirques of the central Tibetan Plateau: Morphology and controlling factors

Cirque morphology represents the characteristics of palaeoglaciations and palaeoclimate. This study mapped and analysed 70 cirques in the central Tibetan Plateau (TP) with dominant continental climate. The results show that from northwest to southeast, cirque dimensions (i.e., length, width, and are...

Full description

Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Zhang, Qian, Dong, Wenhan, Dou, Jiahui, Dong, Guocheng, Zech, Roland
Format: Report
Language:English
Published: ELSEVIER 2021
Subjects:
Cirque
Palaeoclimate
Palaeoglaciation
Central Tibetan Plateau
GLACIAL CIRQUES
SPATIAL-DISTRIBUTION
ICELAND IMPLICATIONS
MOUNTAIN-GLACIATION
CASCADE RANGE
BUZZSAW
CLIMATE
MORPHOMETRY
EROSION
LINE
Physical Geography
Geology
Paleontology
Geography
Physical
Geosciences
Multidisciplinary
Indian
glacier
Iceland
Online Access:http://ir.ieecas.cn/handle/361006/17215
https://doi.org/10.1016/j.palaeo.2021.110656
Description
Summary:Cirque morphology represents the characteristics of palaeoglaciations and palaeoclimate. This study mapped and analysed 70 cirques in the central Tibetan Plateau (TP) with dominant continental climate. The results show that from northwest to southeast, cirque dimensions (i.e., length, width, and area) increase, while cirque floor altitudes decrease. A likely reason is the high precipitation rate caused by the Indian summer monsoon in the southeastern part. The diversity of cirque aspect values indicates weak or inconsistent prevailing winds during cirque development. Cirques enlarge with altitude, which might imply that cirques at high altitudes developed early and thus increased in size. Cirque aspect diversity increases with altitude from 5100 to 5600 m above sea level (asl), which indicates the capacity of high altitudes to support cirques at less favourable slopes. If altitude increases above 5600 m asl, the diversity of cirque aspect first increases and then decreases, which may be because of local topography. Mountain orientation and lithology had an effect on cirque aspect/size. Cirque numbers and sizes were compared between western, central, and eastern sectors of the Gangdise Mountains in the southern TP with those in the central TP. This comparison showed that a strengthening Indian summer monsoon can raise the value of `cirque density' (i.e., cirque number per unit area), promote glacier development into valley-type, and limit cirque enlargement.

Similar Items