|Table of Contents|

Spatiotemporal Model and Mechanism of Monsoon Rainfall in ChinaDuring the Medieval Warm Period and the Current Warm Period(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2019年04期
Page:
145-152
Research Field:
·地理学·
Publishing date:

Info

Title:
Spatiotemporal Model and Mechanism of Monsoon Rainfall in ChinaDuring the Medieval Warm Period and the Current Warm Period
Author(s):
Cui Yingfang1; 2; Zhao Kan2; Zhao Bin2; Wang Quan2; Wang Yongjin2
(1.School of Tourism Management,Nanjing Institute of Tourism and Hospitality,Nanjing 211100,China)(2.School of Geography,Nanjing Normal University,Nanjing 210023,China)
Keywords:
medieval warm period; current warm period; oxygen isotope(δ18O); rainfall; water vapor transport
PACS:
K903
DOI:
10.3969/j.issn.1001-4616.2019.04.020
Abstract:
The Fifth Assessment Report of the Intergovernmental Panel on Climate Change suggests that the existence of Medieval Warm Period(MWP,950-1250 A.D.)and Current Warm Period(CWP,warming in the twentieth century)is very likely. In CWP,annual precipitation anomalies over eastern China are characterized by a north-south dipole pattern,referred to as the“southern flooding and northern drought”pattern(SF/ND). However,spatial pattern of rainfall during MWP shows a“southern dry and northern wet”mode,revealed by paleoclimate reconstructions. Therefore,the mechanism of precipitation variations during the warm periods remains unclear. Inherited from the δ18O signal of precipitation,Chinese stalagmite δ18O records are ideal natural tracers for describing the history of the water cycle. Here,this paper compares stalagmite δ18O records from Shihua Cave,North China with δ18O records from Dongge Cave,South China,to explore the spatiotemporal model of rainfall and its mechanism in late Holocene. In MWP,negative δ18O values in northern China and positive δ18O values in southern China indicate that strong ASM intensity and associated northward progress of the rainband delivered more remote moisture from Indian Ocean to northern China and less to southern China. During the CWP,stalagmite δ18O values show a notable positive trend in both Shihua Cave and Dongge Cave,suggesting that weak ASM intensity and associated southward withdraw of the rainband resulted in the SF/ND pattern. Furthermore,local water vapor from the Pacific Ocean probably contributed to increased rainfall in southern China. The North(dry)-South(wet)pattern during the CWP inversely similar to the spatial pattern during the MWP,probably suggesting different impacts of natural and anthropogenic forcing on precipitation distribution.

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Last Update: 2019-12-31