ENSO-Like Pacing of the Asian Summer Monsoon during the Early Holocene

作者：Xiaohua SHAO,Tao WANG,Yongjin WANG,Hai CHENG,Kan ZHAO,Xinggong KONG

摘要：We present a230Th-dated stalagmite oxygen isotope(δ^18O)record from Loushanguan Cave in the Yangtze River valley,China.The^δ18O record,if viewed as a proxy of the Asian summer monsoon(ASM)intensity,provides an ASM history for the early Holocene with clear centennial-scale variability.A significant approximately 200-yr cycle between 10.2 and 9.1 ka BP(before present,where"present"is defined as the year AD 1950),as revealed by spectral power analyses,is of global significance and is probably forced by the Suess or de Vries cycle of solar activity.Here,we explore a physical mechanism to explain the relationship between the solar activity and the ASM.A strong coherence between the ASM and El Ni?o–Southern Oscillation(ENSO)has been observed by performing crosswavelet analyses on this cycle.Our study suggests that a strong(weak)ASM state corresponds to a warm(cold)ENSO,which is consistent with modern meteorological observations but contrasts with previous studies on regions far from the Meiyu rainbelt.We argue that the centennial fluctuations of the ASM are a fundamental characteristic forced by the solar activity,with the ENSO variability as a mediator.The relationship between ENSO and the ASM displayed spatial heterogeneity on the centennial scale during the early Holocene,which is a more direct analogue to the observed modern interannual variability of the ASM.

發文機構：School of Geography Public Meteorological Service Center of Anhui Province Key Laboratory of Virtual Geographic Environment Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Institute of Global Environmental Change Department of Geology and Geophysics

關鍵詞：ISOTOPErecordsAsiansummerMONSOONElNi?o-SouthernOscillationcentennialscalesolaractivityYANGTZERiverVALLEYearlyHOLOCENE

分類號： P73[天文地球—海洋科學]