Hydroclimatic contrasts over Asian monsoon areas and linkages to tropical Pacific SSTs

• DOI: 10.1038/srep33177
• Publication Date: 2016-09-09T11:25:23Z
• Authors: Hai Xu; Jianghu Lan; Enguo Sheng; Bin Liu; Keke Yu; Yuanda Ye; Zhengguo Shi; Peng Cheng; Xulong Wang; Xinying Zhou; Kevin M. Yeager
• Keywords: Science & Technology; ARABIAN SEA; 550; MEDIEVAL WARM PERIOD; 500; 15. Life on land; 16. Peace & justice; LAKE; 01 natural sciences; TIBETAN PLATEAU; SUMMER MONSOON; CHINA; Article; Multidisciplinary Sciences; 13. Climate action; PRECIPITATION; TREE-RING RECORD; Science & Technology - Other Topics; HOLOCENE CLIMATE-CHANGE; TEMPERATURE; 0105 earth and related environmental sciences

AbstractKnowledge of spatial and temporal hydroclimatic differences is critical in understanding climatic mechanisms. Here we show striking hydroclimatic contrasts between northern and southern parts of the eastern margin of the Tibetan Plateau (ETP), and those between East Asian summer monsoon (EASM) and Indian summer monsoon (ISM) areas during the past ~2,000 years. During the Medieval Period, and the last 100 to 200 years, the southern ETP (S-ETP) area was generally dry (on average), while the northern ETP (N-ETP) area was wet. During the Little Ice Age (LIA), hydroclimate over S-ETP areas was wet, while that over N-ETP area was dry (on average). Such hydroclimatic contrasts can be broadly extended to ISM and EASM areas. We contend that changes in sea surface temperatures (SSTs) of the tropical Pacific Ocean could have played important roles in producing these hydroclimatic contrasts, by forcing the north-south movement of the Intertropical Convergence Zone (ITCZ) and intensification/slowdown of Walker circulation. The results of sensitivity experiments also support such a proposition.