末次冰消期以来海南岛双池玛珥湖沉积中的碳、氮地球化学记录数据集（约20000a BP以来）

根据岩芯的碳、氮含量及其比值分析并结合其他气候替代指标的分析结果，恢复了海南岛双池玛珥湖末次冰消期以来的古气候变化。全新世大暖期始于7400a BP，结束于2700a BP左右，期间热带地区气候湿热，植物茂盛，双池玛珥湖主要处于沼泽化阶段，蒸发量与降雨量持平。但大暖期中仍存在气候的快速波动事件，约7200a BP和7000a BP前后、6000-5900a BP、4300-4000a BP期间气候转凉，有机质生产力降低。大暖期前后，分别有明显的凉温但季节性暴雨频繁的气候(8000-7400a BP、2700-2300a BP)，表示气候模式发生变化，降雨量相对大于蒸发量。此时双池玛珥湖处于深水期，由于气温降低以及湖水上升引起的湖边陡壁植被覆盖面积减少，植物生产力降低，导致了岩芯中有机质的低含量。

Based on the analysis of carbon and nitrogen contents and their C/N ratios in sediment cores, combined with the results of other climate proxy analyses, we reconstructed the paleoclimatic changes of Shuangchi Maar Lake in Hainan Island since the Last Deglaciation. The Holocene Thermal Maximum (HTM) began at 7400 a BP and ended around 2700 a BP. During this period, the tropical region exhibited a warm and humid climate with luxuriant vegetation; Shuangchi Maar Lake was mainly in the paludification stage, with evaporation balanced with precipitation. However, rapid climatic fluctuation events still occurred during the HTM: around 7200 a BP and 7000 a BP, during 6000–5900 a BP and 4300–4000 a BP, the climate turned cool and organic matter productivity decreased. Before and after the HTM, there were distinct cool-temperate climates with frequent seasonal heavy rains (8000–7400 a BP and 2700–2300 a BP, respectively), indicating a shift in climatic patterns where precipitation was relatively greater than evaporation. At this time, Shuangchi Maar Lake was in a deep-water stage. The reduction in vegetation coverage on the lakeside steep slopes caused by decreased air temperature and lake level rise led to lowered plant productivity, resulting in low organic matter content in the sediment cores.