DOI: 10.1016/j.palaeo.2015.08.006
论文题名: Evolution of the South Asian monsoon wind system since the late Middle Miocene
作者: Gupta A.K. ; Yuvaraja A. ; Prakasam M. ; Clemens S.C. ; Velu A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 438 起始页码: 160
结束页码: 167
语种: 英语
英文关键词: Globigerina bulloides
; Late Middle Miocene
; Ocean Drilling Program
; Oman margin
; South Asian monsoon
; Western Arabian Sea
英文摘要: The evolution and timing of the inception of the South Asian monsoon (SAM) has been one of the most debated climatic mysteries amongst climate workers. The Himalaya-Tibetan plateau (HTP) complex has been implicated as the main driver for SAM circulation. However, there are intense debates as to whether there was a critical elevation of the HTP complex that drove the SAM and at what time such a critical elevation was attained. Also, the role of the HTP complex in driving the SAM has been questioned in recent climate model studies. The model simulation suggests a major intensification of the SAM as early as ~30Ma, whereas marine records from the Arabian Sea indicate a major strengthening of the South Asian summer or southwest monsoon winds between 10 and 8Ma. The continental vegetation, on the other hand, captured a major transition from C3 to C4 type during 8-7Ma but whether this change was local or global and whether this transition was driven by monsoonal precipitation is not unanimously accepted. Our new record from Ocean Drilling Program holes located off the Oman margin and on the Owen Ridge, western Arabian Sea shows appearance of monsoon wind proxy planktic foraminifer Globigerina bulloides, a significant increase in total organic carbon, and a negative shift in stable carbon isotope record of benthic foraminifera at ~12.9Ma. These proxies indicate that present day South Asian monsoon wind system began to develop during the late Middle Miocene (~12.9Ma) and summer monsoon was in its full strength in the late Miocene (~7Ma). From 11 to 7Ma, the summer monsoon was weaker when winter monsoon was stronger. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68789
Appears in Collections: 过去全球变化的重建
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作者单位: Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun, India; Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, India; Department of Earth, Environmental and Planetary Sciences, Brown University, 324 Brook Street, PO Box 1846, Providence, RI, United States
Recommended Citation:
Gupta A.K.,Yuvaraja A.,Prakasam M.,et al. Evolution of the South Asian monsoon wind system since the late Middle Miocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,438