NOAA/WDS Paleoclimatology - Intensification of southwestern Indonesian rainfall over the past millennium

Modern precipitation in Indonesia is strongly correlated to variations in the Asian/Australasian monsoons, the Walker circulation, and migrations of the Intertropical Convergence Zone (ITCZ), but controls on multi-decadal to millennial rainfall variations are less clear. We present a new, high-resolution, precipitation proxy reconstruction from Lake Lading (8S, 113E), Java, from 850 C.E. to present, based on the dD of terrestrial plant waxes. We find that rainfall has steadily increased in Java over the past millennium. This increase persists into the 20th century, despite evidence from other tropical proxy records for a northward ITCZ migration during the last two centuries, which should introduce drier conditions to Java. Aspects of this long-term increase in rainfall resemble records from the northern hemisphere, tropical Indo-Pacific, suggesting that strengthening Walker circulation played an important role in this long-term increase in rainfall and decrease in the dD of precipitation, while ITCZ variations may have been important to climate variations on multi-decadal to centennial timescales.

本归档古气候学研究（Paleoclimatology Study）可通过美国国家海洋和大气管理局（NOAA）下属的国家环境信息中心（NCEI）获取，该中心隶属于古气候学世界数据服务（World Data Service, WDS）。相关的NCEI研究类型为湖泊研究。数据集包含古湖沼学（paleolimnology）参数，其地理位置位于印度尼西亚东爪哇（Jawa Timur）。时间范围覆盖日历年前（before present, BP）的1098年至-52年。有关参数及研究地点的详细信息，请参阅元数据。使用本数据时，请引用此项研究。