Tree ring derived summer temperature variability over the past millennium in the western Himalayas of northern Pakistan  

作　　者：Fayaz ASAD Haifeng ZHU Tabassum YASEEN Ru HUANG Mukund Palat RAO 

机构地区：[1]Department of Botany,Bacha Khan University Charsadda,Khyber Dakhtun Khaw 24420,Pakistan [2]State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [3]China Pakistan Joint Research Center on Earth Sciences,CAS-HEC,Islamabad 45320,Pakistan [4]Centre de Recerca Ecològica i Aplicacions Forestals,Barcelona 08193,Spain [5]Department of Plant Science,University of California Davis(UC Davis)95616,California,USA [6]Tree Ring Laboratory,Lamont-Doherty Earth Observatory,Columbia University,NY 10964,USA

出　　处：《Frontiers of Earth Science》2023年第4期1026-1036,共11页地球科学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.42007407);the Sino-German mobility program(M-0393);the China-Pakistan Joint Research Center on Earth Sciences(No.131551KYSB20200022).

摘　　要：Long-term high resolution climate proxies are essential for understanding climate variability particularly,in regions such as the western Himalayas of northern Pakistan,where few long-term climate records are available.Using standard dendrochronological methods,an 1132-year(882 to 2013 C.E.)tree-ring chronology of Juniperus excelsa M.Bieb was established from the western Himalayas,northern Pakistan(WHNP).Tree growth was negatively and significantly(r=-0.65)correlated with the growing season(June-July)mean temperature,and positively and weakly(r=0.22)associated with precipitation.This inverse relationship of tree radial growth with temperature and positive association with precipitation demonstrated that forest growth is sensitive to high temperature related drought.Utilizing a reliable STD chronology and robust reconstruction model,a 928-year(1086 to 2013 C.E.)mean temperature reconstruction was developed for the WHNP using the substantial negative correlation between the summer temperature and standard tree ring-width chronology.According to statistical validation,the reconstruction accounted for 41.6% of the climatic variation for the period of 1956-2013 C.E.instrumental period.Individual extreme-warm periods occurred in 1093 C.E.(29.42℃)and extreme cold periods in 1088 C.E.(26.99℃)observed during the past 928 years.The reconstruction's multi-taper method(MTM)spectral analysis reveals significant(p<0.05)2-3-year and 63.8-year cycles.Since the 2-3-year cycle occurred within the range of ENSO variation,which indicates that ENSO had an impact on the regional temperature in our studied area.

关 键 词：tree rings Juniperus excelsa dendrochronology reconstruction western Himalaya 

分 类 号：P46[天文地球—大气科学及气象学]