塔里木盆地南缘9-14世纪期间气候环境特征研究

由昆仑北麓的尼雅剖面沉积物多指标的变化并未记录到 9- 1 4世纪期间“MWP”期间显著温暖特征的存在 ,但是在此期间存在 4次相对冷 (湿 )事件 ,分别发生于约 930 AD至1 0 30 AD前后 ( C- 1 )、1 0 70 AD前后 ( C- 2 )、1 1 0 0 - 1 1 30 AD期间 ( C- 3)和 1 2 1 0 AD前后 ( C-4) ,1 2 1 0 AD之后转入稳定暖干特征时期 ,其中尤以 C- 1冷 (湿 )程度最强。这 4次冷事件持续时间最长约 1 0 0 a,一般在 5 0 a或 1 0 - 30 a之间 ,它们与相间的相对暖干期共同组成了尼雅剖面“MWP”期间冷湿与暖干快速、频繁交替的特征。分析表明 ,“MWP”期间由尼雅剖面记录的气候变化具有 60 .2 a、1 5 .5 a、1 0 .8a、6.3a和 3.1 7a的显著周期变化。

Preliminary Study of Climate Characteristics During 9th-14th Century in extremely drought sounthern Xinjiang

High resolution multi-proxies of climatic changes recorded in the Niya section,south margin of Tarim basin,did not show evident warm features during 9 th -14 th century (i.e the Medieval warm period,MWP).But 4 relatively cole (wet) epochs occurred at about 930AD-1030AD(C-1) ,about 1070AD(C-2) ,1100-1130AD(C-3) and about 1210AD(C-4),which were generally lasting between 50a or 20-30a,100a to the most.Among the 4 cold phases,the C-4 is of strongest cooling.After 1210AD,climate stepped into relatively stable warm (dry) period.High resolution Guliya ice core in west Kunlun Mts.also ushers the same climatic characteristics during MWP.Spectrum analysis has throw light on several evident climatic cycles of 60.2a,15.5a,10.8a,6.3a and 3.17a recorded in the Niya section,indicating climate change in this area was strongly affected by solar forcing.