Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years
Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years
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长江中下游鄱阳湖沉积物总有机碳同位素记录的近1600年降水变化
DOI：
10.1016/j.quaint.2016.07.020
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发表时间：
2016-12
影响因子：
2.2
通讯作者：
Weiguo Liu
中科院分区：
文献类型：
--
作者：
Xiangzhong Li;Hong Yang;Yuan Yao;Yuwei Chen;Weiguo Liu
鄱阳湖是中国最大的淡水湖，以其作为动态湿地和湖泊系统的生态和水文重要性而闻名。近年来，气候变化及其对湖泊生态和水文系统的影响引起了人们的广泛关注。因此，对鄱阳湖沉积物岩芯的δ13C总有机质（δ13Corg）进行了分析，以研究鄱阳湖流域的水文变化。通过与现代气象资料（降水量、气温）和水文资料（径流量）的对比，发现沉积物中的δ13Corg值与鄱阳湖5条主要供水河流的总径流量和该区近50年来的降水量呈负相关。因此，鄱阳湖沉积物的δ13Corg值可以作为河流流量和区域降水重建的可靠代理，δ13Corg值为负值代表鄱阳湖地区降水量增加。在此基础上，讨论了鄱阳湖流域近1600年的河流流量和区域降水变化。 δ13Corg 值表明，降水量在公元 340-880 年期间最高，然后波动减少，在公元 1110 年左右达到最低值。中世纪暖期（公元1110-1350 AD，MWP）期间，除公元1140-1220年间降水量较少外，降水量总体较高。小冰河时期（公元 1350-1620 年，LIA）降水量较低，但在公元 1550-1560 年左右突然增加。从公元1610年至今，降水量持续增加，波动不大。总体而言，区域降水和河流流量的变化主要受鄱阳湖地区亚洲夏季风（ASM）降水变化的影响，这与中国ASM控制区的其他记录一致。
Lake Poyang, the largest freshwater lake of China, is well known for its ecological and hydrological importance as a dynamic wetland and lake system. The climatic change and its effect on ecological and hydrological system of the lake has aroused considerable interest in recent years. So, a sediment core from Lake Poyang was analyzed for δ13C total organic matter (δ13Corg) to study the hydrological changes in the Lake Poyang catchment. By comparing with modern meteorological data (precipitation and temperature) and hydrological data (volume of runoff), the result showed that the δ13Corg values in the sediment are negatively correlated with the total runoff of the 5 main rivers supplying water to Lake Poyang and precipitation in this area over the past 50 years. Therefore, the δ13Corg values of the Lake Poyang sediment can serve as reliable proxies for reconstruction of river discharge and regional precipitation, with negative δ13Corg values representing increased precipitation in the Lake Poyang area. On this basis, the river discharge and regional precipitation variation in the Lake Poyang catchment over the past 1600 years were discussed. The δ13Corg values suggest that the precipitation was highest in the period 340–880 AD, and then decreased with fluctuations to the minimum at approximately 1110 AD. During the period of Medieval Warm Period (1110–1350 AD, MWP), the precipitation was generally in the high level except low amount during period of 1140 AD to 1220AD. The precipitation was in low amount during the Little Ice Age (1350–1620 AD, LIA), except for a sudden increase at approximately 1550–1560 AD. The precipitation continuously increased with little fluctuation from 1610 AD until now. In general, changes in regional precipitation and river discharge were dominated by variations in the Asian Summer Monsoon (ASM) precipitation in the Lake Poyang area, consistent with other records from the ASM-controlled areas of China.
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发表时间：
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