Synchronous precipitation reduction in the American Tropics associated with Heinrich 2

M Medina-Elizalde, SJ Burns, J Polanco-Martinez… - Scientific reports, 2017 - nature.com
Scientific reports, 2017nature.com
During the last ice age temperature in the North Atlantic oscillated in cycles known as
Dansgaard-Oeschger (DO) events. The magnitude of Caribbean hydroclimate change
associated with DO variability and particularly with stadial intervals, remains poorly
constrained by paleoclimate records. We present a 3.3 thousand-year long stalagmite δ18O
record from the Yucatan Peninsula (YP) that spans the interval between 26.5 and 23.2
thousand years before present. We estimate quantitative precipitation variability and the …
Abstract
During the last ice age temperature in the North Atlantic oscillated in cycles known as Dansgaard-Oeschger (D-O) events. The magnitude of Caribbean hydroclimate change associated with D-O variability and particularly with stadial intervals, remains poorly constrained by paleoclimate records. We present a 3.3 thousand-year long stalagmite δ18O record from the Yucatan Peninsula (YP) that spans the interval between 26.5 and 23.2 thousand years before present. We estimate quantitative precipitation variability and the high resolution and dating accuracy of this record allow us to investigate how rainfall in the region responds to D-O events. Quantitative precipitation estimates are based on observed regional amount effect variability, last glacial paleotemperature records, and estimates of the last glacial oxygen isotopic composition of precipitation based on global circulation models (GCMs). The new precipitation record suggests significant low latitude hydrological responses to internal modes of climate variability and supports a role of Caribbean hydroclimate in helping Atlantic Meridional Overturning Circulation recovery during D-O events. Significant in-phase precipitation reduction across the equator in the tropical Americas associated with Heinrich event 2 is suggested by available speleothem oxygen isotope records.
nature.com
以上显示的是最相近的搜索结果。 查看全部搜索结果

Google学术搜索按钮

example.edu/paper.pdf
搜索
获取 PDF 文件
引用
References