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“雨量效应”与“环流效应”:近1 ka亚澳季风区石笋和大气降水δ18O的气候意义 被引量:4

“Amount effect” vs. “Circulation effect”: The climate significance of precipitation and stalagmite δ18O in the Asian-Australian monsoon region over the past 1 ka
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摘要 亚澳季风主要由东亚季风、印度季风和澳大利亚季风三部分组成。目前,该地区石笋和大气降水δ18O气候意义的最大争议在于到底反映的是降水量变化还是水汽源的变化。针对这一争议,本文选取亚澳季风区的18个大气降水站点和5个洞穴近1 ka石笋记录的δ18O数据进行对比分析,主要得到以下几点认识:1)在月时间尺度上,亚澳季风区大气降水δ18O与月降水量均呈现明显的反相关关系,数学统计结果符合"雨量效应",而实质原因是不同季节水汽源的差异。2)在年际尺度上,在东亚季风区与澳大利亚季风区大气降水δ18O的年加权平均值与年降水量的相关性并不明显,但在印度季风区呈现明显的负相关关系,说明主要受相对单一水汽源影响的印度季风区大气降水中δ18O的年际变化"雨量效应"显著;在受复合水汽源影响的东亚季风与澳大利亚季风区"雨量效应"并不显著。3)在亚澳季风影响的广大地区,各地区年际尺度的大气降水中δ18O变化趋势以及近1 ka洞穴石笋记录δ18O变化趋势均呈现相似的特征,但二者本质并不相同。印度季风区大气降水和石笋δ18O反映的是"雨量效应",但在受复合水汽源影响的东亚季风与澳大利亚季风区大气降水δ18O和石笋δ18O反映的是"环流效应"。 The Asian-Australian monsoon is mainly composed of three parts, which are East Asian monsoon, Indian monsoon, and Australian monsoon, respectively (Figure 1). At present, the biggest controversy about the climatic significance of δ18O in this area is whether it reflects the change of rainfall or the source of water vapor. In view of this controversy, this paper selects eighteen atmospheric precipitation stations and five stalagmite δ18O records nearly 1 ka in the Asian-Australian monsoon region. The regulations are as followed: (1)On the monthly timescale, by comparison with δ18O and monthly precipitation show a significant negative relationship, which are consistent with "amount effect" according to mathematical statistics result. However, the essence is the difference of water vapor sources in different seasons. (2)On the inter-annual scale, the relationship among the weighted mean δ18O of precipitation and annual precipitation which are not obvious in East Asia and Australian monsoon regions. However, this correlation is significant negative in India monsoon region, indicating that the use of "Amount effect" to explain the change of inter-annual timescale precipitation δ18O in the single water source, which is suitable. Nevertheless,"amount effect" is not significant in the East Asian monsoon and the Australian monsoon affected by the composite water vapor source. (3)In the vast area affected by Asian-Australian monsoon, although from atmospheric precipitation to stalagmite δ18O over the past 1 ka show the same characteristic, which belongs to different mechanisms.The inter-annual timescale precipitation and stalagmite δ18O over the past 1 ka in the India monsoon region mainly controlled by the single water source may reflect "amount effect". However, East Asia and Australian monsoon regions was dominated by the composite water vapor source, which reflects the change of "Circulation effect". The precipitation and stalagmite δ18O in the Asian-Australian monsoon regi
作者 张键 李廷勇 Zhang Jian1,2, Li Tingyong1,2(1. Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences;Southwest University, Chongqing 400715;2. Field Scientific Observation & Research Base of Karst Eco-environments at Nanchuan in Chongqing, Ministry of Land and Resources of China, Chongqing 408435)
出处 《第四纪研究》 CSCD 北大核心 2018年第6期1532-1544,共13页 Quaternary Sciences
基金 国家自然科学基金项目(批准号:41772170)和中央高校基本科研业务费专项项目(批准号:XDJK2017A010)共同资助
关键词 亚澳季风区 Δ18O 大气降水 石笋 “雨量效应” “环流效应” ENSO Asian-Australian monsoon region δ18O rainfall stalagmite “Amount effect” “Circulation effect” ENSO
作者简介 张键,男,25岁,硕士研究生,第四纪地质学专业,E-mail:1647453766@qq.com;通讯作者:李廷勇,E-mail:cdlty@swu.edu.cn
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