中国全新世暖期降水格局的集成重建

Reconstruction of Precipitation Pattern of China in the Holocene Megathermal

根据国内外公开发表的各类文献,搜集整理中国全新世暖期6.5～5.5 ka B.P.的定量古降水记录,采用空间集成重建方法对原始记录进行重复记录归并和空间集成分析,获得271个地点的有效降水记录,据此重建中国全新世暖期的降水格局。结果表明:全新世暖期,中国年降水量普遍高出现代50～300 mm;降水绝对增幅以长江中下游地区最大,增加250～300 mm,向南北递减,东南沿海约增加100 mm,至西北地区只增加约50 mm;相对增幅从东南沿海向西北内陆递增,东南沿海仅高出现代的15%～25%,西北及青藏高原地区可高出现代1倍左右。

Based on numbers of published papers,357 items quantitatively reconstructed precipitation were collected in the Holocene Megathermal（6.5-5.5 ka B.P.） at 285 sites in China.Spatial synthesis method is assigned to assess reliability of the reconstructed results in order to weed out the unreasonable data and to reduce the uncertainty.After the spatial synthesis analysis,271 items available precipitation records have been gotten to reconstructed the annual precipitation of China in the Holocene Megathermal.The results show that,in the Holocene Megathermal,annual precipitation was higher than today by about 50-300 mm.The increase of precipitation had significant regional differences.The maximum increase was 250-300 mm in the middle and lower reaches of the Yangtze River.The increase was about 100 mm in the southeast coastal area,about 100-150mm in North China,and about 50 mm in the most northwest of China.The relative increase was about 15%-25% higher than today in southeast coastal area,but it was about double than today in Xinjiang and the Qinghai-Xizang Plateau.