Quantification of Holocene Asian monsoon rainfall from spatially separated cave records
Quantification of Holocene Asian monsoon rainfall from spatially separated cave records
复制标题
从空间分离的洞穴记录量化全新世亚洲季风降雨
DOI：
10.1016/j.epsl.2007.10.015
复制
发表时间：
2008-02-20
影响因子：
5.3
通讯作者：
Johnson, Kathleen R.
中科院分区：
文献类型：
--
作者：
Hu, Chaoyong;Henderson, Gideon M.;Johnson, Kathleen R.
本文对中国西南地区的全新世降水进行了重建，该地区由于东亚季风的变化而容易发生干旱和洪涝。通过将新的高分辨率石笋三角洲O-18记录与所有来自相同水分输送路径的现有记录进行比较，得出了重建结果。新记录来自河上洞（北纬30度27分，东经110度25分，海拔294米），没有显示出动力或蒸发作用的迹象，因此可以可靠地解释为当地降雨组成和温度的记录。河上位于有高分辨率三角洲O-18记录的东哥洞下风600 km处（王永军，程洪，Edwards， R. L.，何永强，孔祥国，安正生，吴家勇，Kelly， M.J, Dykoski， C.A，李晓东，2005）。全新世亚洲季风：与太阳变化和北大西洋气候的联系。科学学报，308,854-857)。通过对两个洞穴的δ O-18共同评估值的差异，绕过了δ O-18的次要控制因素（如水分来源、水分输送、非局地降雨、温度），得到的δ δ O-18信号直接由两个地点之间的降雨量控制。通过与仪器记录的降雨数据进行比较，这一点得到了证实，仪器记录也允许对δ δ O-18代理进行校准。校正后的δ δ O-18记录提供了中国西南地区的降水定量历史，表明在全新世气候最佳时期（约6 ka），降雨量比今天高8%，而在全新世早期，降雨量仅比今天高3%。在8.2 ka、4.8-4.1 ka、3.7-3.1 ka、1.4- 1.0 ka和小冰期均有显著的干旱期。这个全新世的降雨记录为测试气候模型提供了一个很好的目标。这里使用的方法，结合来自多个地点的石笋记录，也将允许量化其他地区过去时间的降雨模式。(c) 2008年Elsevier B.V.出版
A reconstruction of Holocene rainfall is presented for southwest China - an area prone to drought and flooding due to variability in the East Asian monsoon. The reconstruction is derived by comparing a new high-resolution stalagmite delta O-18 record with ail existing record from the same moisture transport pathway. The new record is from Heshang Cave (30 degrees 27'N, 110 degrees 25'E; 294 m) and shows no sign of kinetic or evaporative effects so can be reliably interpreted as a record of local rainfall composition an temperature. Heshang lies 600 km downwind from Dongge Cave which has a published high-resolution delta O-18 record (Wang, Y.J., Cheng, H., Edwards, R. L., He, Y.Q., Kong, X.G., An, Z.S., Wu, J.Y., Kelly, M.J., Dykoski, C.A., Li, X.D., 2005. The Holocene Asian monsoon: links to solar changes and North Atlantic climate. Science 308, 854-857). By differencing co-eval delta O-18 values for the two caves, secondary controls on delta O-18 (e.g. moisture source, moisture transport, non-local rainfall, temperature) are circumvented and the resulting Delta delta O-18 signal is controlled directly by the amount of rain falling between the two sites. This is confirmed by comparison with rainfall data from the instrumental record, which also allows a calibration of the Delta delta O-18 proxy. The calibrated Delta delta O-18 record provides a quantitative history of rainfall in southwest China which demonstrates that rainfall was 8% higher than today during the Holocene climatic optimum (approximate to 6 ka), but only 3% higher during the early Holocene. Significant multi-centennial variability also occurred, with notable dry periods at 8.2 ka, 4.8-4.1 ka, 3.7-3.1 ka, 1.4- 1.0 ka and during the Little Ice Age. This Holocene rainfall record provides a good target with which to test climate models. The approach used here, of combining stalagmite records from more than one location, will also allow quantification of rainfall patterns for past times in other regions. (c) 2008 Published by Elsevier B.V.