Comparisons of drought variability between central High Asia and monsoonal Asia: Inferred from tree rings |
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Authors: | Keyan Fang Xiaohua Gou Fahu Chen Fen Zhang Yingjun Li and Jianfeng Peng |
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Institution: | (1) Key Laboratory of Western Chinese Environmental Systems (MOE), Center for Arid Environment and Paleoclimate Research (CAEP), Lanzhou University, 730000 Lanzhou, China;(2) Tree-Ring Lab, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA |
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Abstract: | Severe drought is a serious natural disaster that frequently strikes East Asia, highlighting the need to understanding its
drought regime and the associations with Asian monsoon. Tree-ring-based drought reconstructions provide invaluable paleoclimatic
archives for detecting regional and large-scale drought variability and their potential forcings. We herein reviewed many
drought reconstructions from central High Asia and monsoonal Asia and compared their similarities and differences, as well
as their linkages to Asia monsoon. We compared the decadal-scale variability of six drought reconstructions for the central
High Asia, where differing drought variations were found between the western and eastern portions. Seven drought reconstructions
were reviewed for monsoonal Asia, from which a difference in drought variability was observed between the northern and southern
parts. Therefore, we compared the drought variations of the four sub-regions of western and eastern parts of central High
Asia, as well as northern and southern portions of monsoonal Asia. ENSO activity and sea surface temperature of western Pacific
and northern Indian Oceans, coupled with Asian monsoon, play an important role in modulating drought variability of much area
of the East Asia. An improved denser multi-index tree-ring network of longer length for East Asia is necessary for the establishment
of more reliable large-scale drought reconstruction. |
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