摘要
概述了全球和中国近2ka以来的气候变化研究的概况,赞成努力建立2ka以来区域的高分辨率的气候变化系列的主张。通过测试了采自南沙群岛永暑礁湖中的南永3井岩芯的高精度TIMS铀系年龄,分析了样品中底栖有孔虫茸刺距轮虫(Calcarinahispida)δ18O,计算了历史时期表层海水温度和气温,结果自330AD以来可划分为4个凉和4个热的气候期,还细分出37个气候凉热波动亚期。气候波动的周期性很明显。首次提出了1条南沙群岛地区1670a以来的量化的高分辨历史气候温度变化曲线。
The studies of the climate change in the past 2ka in China and the world are summarized. It is claimed to build the regional high-precision series of climate change in the past 2ka. The Nanyong-3 well core from the Yongshu Atoll lagoon in the Nansha Islands is measured by high-precision TIMS U serious dating, and then the δ^(18)O of the benthonical Calcarina hispida[Brady] in the sample is analysized. After the SST and air temperature (AT) in different historical period is calculated, 4 cool and 4 warm periods are differentiated since 330AD and 37 climate sub-periods are defined in further division. The periodicity of the climate fluctuation is remarkable. The historical change curve of the climate of the Nansha Islands, which is of unprecedented high resolution, is shown. In largely, its trend is in accordance with the results from the studies of historical reference of China continent or ice-core, as well as the global change. It is also proved that it was the coldest in the 10th century since 330AD, and that the small glacial period lastsd 300yrs, from the end of 16th century to the end of the 19th century.
出处
《热带地理》
2004年第2期103-108,共6页
Tropical Geography
基金
国家"九五"科技攻关计划南沙群岛综合科学考察项目(97-926-03-01)专题
