Reconstructing precipitation in the tropical South Pacific from dinosterol 2H/1H ratios in lake sediment
Reconstructing precipitation in the tropical South Pacific from dinosterol 2H/1H ratios in lake sediment
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根据湖泊沉积物中的脂甾醇 2H/1H 比率重建热带南太平洋降水
DOI:
10.1016/j.gca.2018.10.028
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发表时间:
2019
影响因子:
5
通讯作者:
Maloney A
中科院分区:
文献类型:
--
作者:
Maloney A
The South Pacific Convergence Zone (SPCZ) is the Southern Hemisphere’s largest precipitation feature supplying freshwater to 11 million people. Despite its significance, little is known about the location and intensity of SPCZ precipitation prior to instrumental records, hindering attempts to predict precipitation changes in a warming world. Here we use sedimentary molecular fossils to establish a tool for extending the historical record of precipitation. Freshwater lake sediments and water samples were collected from 30 lakes that span a 4.6 mm d−1range in precipitation rates from the Global Precipitation Climatology Project (GPCP). δ2Hlakewatervalues from 29 lakes ranged from −29 to +23‰ and were inversely correlated (r= −0.51,p< 0.001) with precipitation rates, likely due to the combination of the amount of precipitation plus evaporation. δ2H values of the dinoflagellate sterol dinosterol in surficial sediments from 21 lakes ranged from −316‰ in the Solomon Islands to −245‰ in French Polynesia. These δ2Hdinosterolvalues were significantly correlated (r= 0.71,p< 0.001) with δ2Hlakewaterand inversely correlated (r= −0.77,p< 0.001) with mean annual precipitation rates with a sensitivity of −12.1 ± 2.6‰ (mm d−1)−1. Fractionation between dinosterol and lake water (εdinosterol/lakewater) decreased at the driest lake sites (r= − 0.70,p< 0.001). The empirical relationship between δ2Hdinosteroland GPCP rainfall, although indirect, provides a means of quantitatively reconstructing past precipitation in the SPCZ region with an uncertainty of less than 3.1 mm d−1, which compares favorably to the 1.5 mm d−1uncertainty for the satellite-gauge based GPCP precipitation data.
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