Precipitation variability in the Indian Central Himalaya during last ca. 4,000 years inferred from a speleothem record: Impact of Indian Summer Monsoon (ISM) and Westerlies

被引:104
|
作者
Kotlia, Bahadur Singh [1 ]
Singh, Anoop Kumar [1 ]
Joshi, Lalit Mohan [1 ]
Dhaila, Bachi Singh [1 ]
机构
[1] Kumaun Univ, Ctr Adv Study Geol, Naini Tal 263002, India
关键词
Indian Central Himalaya; Stalagmite; Late Holocene; Oxygen and carbon isotopes; Indian Summer Monsoon (ISM); Westerlies; HOLOCENE ENVIRONMENTAL-CHANGES; STABLE-ISOTOPE COMPOSITION; ASIAN SOUTHWEST MONSOON; HIGH-RESOLUTION; ICE-AGE; HYDROLOGICAL CHANGES; HIMACHAL-PRADESH; CLIMATE-CHANGE; POLLEN RECORD; DONGGE CAVE;
D O I
10.1016/j.quaint.2014.10.066
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We report the first high resolution stalagmite record from Indian Central Himalaya by using a combined oxygen and carbon isotopic study spanning the last 4000 years. In addition to the multi-decadal events, the stalagmite data also provide information on the variability in the intensity of precipitation [Indian Summer Monsoon (ISM) and Westerlies] in north Indian hills during the Late Holocene. The delta O-18 values show strong variability between -2.1 parts per thousand and -8.9 parts per thousand. The extremely high variability points to the monsoon from two different sources compared to other similar aged caves which are primarily controlled by one monsoon, such as the East Asian Summer Monsoon (EASM; although ISM has penetrated into some parts in the areas of EASM in the past) or the Westerlies. Therefore, we suggest that the Westerlies played an important role in the Late Holocene climate of the Indian Himalaya. As the source of the Westerlies is Mediterranean/Atlantic, the North Atlantic Oscillation (NAO) which was responsible for comparatively stronger Westerlies in southern Europe, may have brought higher precipitation to the north Indian hills. The stronger Westerlies may also have resulted in the highest precipitation between 0.5 and 0.25 ka BP (1450-1700 AD; a part of the LIA) in contrast to the weakening of the Indian Summer Monsoon (ISM) in peninsular India. The stalagmite has also recorded the driest period, peaking at similar to 3.2 ka BP which may be nearly synchronous with the final collapse of the Harappan culture in northwest India. (C) 2014 Elsevier Ltd and INQUA. All rights reserved.
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收藏
页码:244 / 253
页数:10
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