张键^1,2,,
李廷勇^1,2,,
1. 西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
2. 国土资源部岩溶生态环境——重庆南川野外基地, 重庆 408435

基金项目: 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


详细信息

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

中图分类号: P597⁺.2;P426.6;P534.63⁺2

收稿日期:2018-05-30
修回日期:2018-09-02
刊出日期:2018-11-25

"Amount effect" vs. "Circulation effect": The climate significance of precipitation and stalagmite δ¹⁸O in the Asian-Australian monsoon region over the past 1 ka

Zhang Jian^1,2,,
Li Tingyong^1,2,,
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


More Information

Corresponding author: Li Tingyong,E-mail:cdlty@swu.edu.cn

MSC: P597⁺.2;P426.6;P534.63⁺2

--> Received Date: 30 May 2018
Revised Date: 02 September 2018
Publish Date: 25 November 2018


摘要
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"。
关键词: 亚澳季风区/
δ¹⁸O/
大气降水/
石笋/
“雨量效应”/
“环流效应”/
ENSO

Abstract: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 region are correlated with ENSO (El Ni?o-Southern Oscillation), indicating that precipitation and stalagmite δ¹⁸O response to low-latitude signals characterized by ENSO is more obvious than that of high-latitude signals governed by the melting of ice-sheet. If the association between stalagmite δ¹⁸O and ENSO is still applicable for the Holocene or glacial-interglacial timescale, it is possible to reconstruct the ENSO series using high-precision dating and high-resolution speleothem records in this region.
Key words:Asian-Australian monsoon region/
δ¹⁸O/
rainfall/
stalagmite/
"Amount effect"/
"Circulation effect"/
ENSO



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