Investigating the long-term palaeoclimatic controls on the δD and δ18O of precipitation during the Holocene in the Indian and East Asian monsoonal regions
Investigating the long-term palaeoclimatic controls on the δD and δ18O of precipitation during the Holocene in the Indian and East Asian monsoonal regions
复制标题
研究印度和东亚季风区全新世期间古气候对降水ΔD和Δ18O的长期控制
DOI：
10.1016/j.earscirev.2016.06.007
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发表时间：
2016-08
影响因子：
12.1
通讯作者：
Fahu Chen
中科院分区：
文献类型：
--
作者：
Zhiguo Rao;Yunxia Li;Jiawu Zhang;Guodong Jia;Fahu Chen
本文旨在更好地了解亚洲季风区降水δD和δ18O值（δDp和δ18Op）的长期变化趋势及其与全新世相应湿度趋势的关系。为此，我们首先回顾了不同东亚夏季风强度下东亚夏季风区夏季降水分布的现代空间格局，以及东亚夏季风区和印度夏季风区现代观测到的δ18Op值与月和年际时间尺度上相应降水量之间的关系。其次，我们比较了亚洲季风区全新世湖泊和海洋化合物特有的正烷烃/正烷酸（δDn）氢同位素记录、湖泊自生碳酸盐和洞穴石笋氧同位素记录（δ18Oc和δ18Os），所有这些都与δDp和δDp密切相关。 δ18Opvariations。结果表明，在 ISM 和 EASM 地区，所有这些同位素记录都表现出大致相似的长期特征，即它们在全新世早期和中全新世早期（约 11-6 ka B.P.；B.P. 指现在之前，现在 = 公元 1950 年）都更加消极，然后在全新世晚期变得更加积极。第三，我们比较了亚洲季风区的代表性古湿度记录；结果证实，在ISM地区，在全新世早期和全新世中期早期（大约11-6ka B.P.）出现了一个潮湿的时期，随后到了全新世晚期，气候变得更加干旱。这表明在全新世早期和全新世中期早期（约 11-6 ka B.P.）ISM 增强，而到全新世晚期 ISM 强度减弱。在全新世轨道尺度上，δ18Op 和 δDp 似乎都受到 ISM 区域的“量效应”控制，与该区域的年际现代 δ18Op 数据一致。这一证据表明 δ18Op 和 δDppaleo 记录与 ISM 地区的古湿度显着相关。相比之下，东亚夏季风地区的全新世湿度变化表现出明显的空间差异：中国南部和北部出现了湿润的全新世中期区间（约8-3 ka B.P.），而干旱区间则出现在约8-3 ka B.P.。 7–3 ka 血压发生在中国中部、长江中游地区。根据过去几十年东亚夏季风地区不同东亚夏季风强度下的降水分布规律，我们得出东亚夏季风强度在全新世中期（约8-3ka B.P.）期间增强的结论。相对于ISM强度，EASM强度对夏季日照的响应相对较慢。在东亚夏季风地区，气候与 δ18Op 和 δDpi 之间的关系更为复杂，这与区域年际现代 δ18Op 数据的分析一致。这一证据表明，δ18Op 和 δDppaleo 记录都不能直接用作 EASM 地区的古湿度（即降水量或 EASM 强度）指标。进一步的对比分析表明，东西向赤道太平洋温度梯度与西太平洋副热带高压的耦合变化对全新世东亚夏季风强度的决定具有重要作用。
This paper aims to achieve an improved understanding of the long-term change trends of precipitation δD and δ18O values (δDpand δ18Op) in the Asian monsoonal region and their relationship with the corresponding humidity trends during the Holocene. To do this we first review the observed modern spatial pattern of summer precipitation distribution in the East Asian summer monsoon (EASM) region under different EASM intensities, and the relationship between modern observed δ18Opvalues and corresponding precipitation amounts on monthly and inter-annual timescales in the EASM and Indian summer monsoon (ISM) regions. Second, we compare Holocene lacustrine and marine compound-specific hydrogen isotopic records ofn-alkanes/n-alkanoic acid (δDn), lacustrine authigenic carbonate and cave stalagmite oxygen isotopic records (δ18Ocand δ18Os) from the Asian monsoonal region, all of which are closely related to δDpand δ18Opvariations. The results demonstrate that in both the ISM and EASM regions, all of these isotopic records exhibit roughly similar long-term characteristics, i.e. they were all more negative during the early-Holocene and early mid-Holocene (ca. 11–6 ka B.P.; B.P. means before present, present = 1950 AD), and then became more positive towards the late-Holocene. Third, we compare representative paleo-humidity records from the Asian monsoonal region; the results confirm that, in the ISM region, a humid interval occurred in the early-Holocene and early mid-Holocene (ca. 11–6 ka B.P.) and subsequently the climate became more arid towards the late-Holocene. This indicates an enhanced ISM during the early-Holocene and early mid-Holocene (ca. 11–6 ka B.P.), and an ISM of decreasing intensity towards the late-Holocene. On a Holocene orbital scale, both δ18Opand δDpappear to be controlled by an “amount effect” in the ISM region, consistent with the region's inter-annual modern δ18Opdata. This evidence indicates that both δ18Opand δDppaleo-records are significantly related to paleo-humidity in the ISM region. In contrast, Holocene humidity variations in the EASM region exhibit clear spatial differences: a humid mid-Holocene interval (ca. 8–3 ka B.P.) occurred in southern and northern China, but an arid interval from ca. 7–3 ka B.P. occurred in central China, in the middle reaches of the Yangtze River. Based on precipitation distribution patterns under different EASM intensities in the EASM region over the past few decades, we conclude that EASM intensity was enhanced during the mid-Holocene (ca. 8–3 ka B.P.). Relative to the ISM intensity, the response of EASM intensity to summer insolation was relatively slow. In the EASM region the relationship between climate and δ18Opand δDpis more complex, consistent with analyses of regional inter-annual modern δ18Opdata. This evidence demonstrates that both δ18Opand δDppaleo-records cannot be used directly as paleo-humidity (i.e. precipitation amount or EASM intensity) indicators in the EASM region. Further comparison and analyses demonstrate that the coupled variations in west–east Equatorial Pacific temperature gradients and the West Pacific subtropical high (WPSH) played an important role in determining EASM intensity during the Holocene.
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