A 350-cm-long sediment core sequence from Dahu Swamp situated in the eastern Nanling Mountains was selected for high-resolution paleoclimatic reconstruction since the Late Glacial period. The multi-proxy records of this paper reveal several evidently dry and cold events that may coincide with the Oldest Dryas, the Older Dryas, the Younger Dryas in the late deglacial period. Two relatively wetter and warmer phases occurred in ca. 15,000-14,400 cal yr B.P. and 13,500-12,800 cal yr B.P. respectively may correspond to the Blling and Allerd warming events. The Younger Dryas event (ca. 12,800-11,500 cal yr B.P.) revealed by multi-proxies was characterized by relatively colder and drier climate. A warmer and wetter climate, occurred in ca. 10,000-6000 cal yr B.P., was consistent with the Holocene Optimum, which coincided with the maximum Northern Hemisphere insolation. The "8.2kyr cool event" and even the "8.8kyr cool event" were indicated as well from our sediment core. A dry mid-Holocene period (ca. 6000- 3000 cal yr B.P.) indicated by multi-proxies does not follow the traditional concept of the wet mid-Holocene conditions observed in other regions in China.
XUE Jibin ZHONG Wei ZHENG Yanming MA Qiaohong CAI Ying OUYANG Jun
在14C测年的基础上,分析了雷州半岛北部湛江市屋山泥炭剖面和遂西县下录泥炭剖面的沉积特征及其腐殖化度、有机质含量变化,发现两个剖面在相同时段内的沉积特征和气候环境特征都比较吻合,充分证明了研究区区域的气候环境变化是控制两个地点泥炭发育的主要因素。研究表明:泥炭腐殖化度敏感地记录了古气候信息,其高值指示气候相对暖湿,低值指示气候相对冷干。50―30calkaBP期间雷州半岛北部气候暖湿,30―10calkaBP期间气候则相对冷干。将其腐殖化度与格陵兰NGRIP冰芯δ18O对比发现:50―30 cal ka BP期间雷州半岛北部存在多次短尺度的气候冷干事件,其中千年尺度气候事件很好地响应了Heinrich事件H5-H3。
