中国干旱、半干旱区末次冰期以来气候变化规律

Laws of Climate Change in Arid and Semiarid Zones of China since Last Glacial Period

以临夏塬堡末次冰期中晚期黄土剖面为基础 ,选用我国干旱、半干旱区末次冰期以来同期异相或同期同相的气候记录与研究剖面进行对比分析后表明 :位于西风气流控制的新疆地区全新世气候总体表现为偏干偏冷 ,晚期较为温暖的特点 ,其气候波动的幅度和频率较低。而位于季风环流控制的其它地区 ,全新世气候变化反映了同样的变化规律 ,即早全新世的升温波动期、中全新世的温暖稳定期和晚全新世的变冷期 ,其气候波动的幅度和频率较快。而无论是西风气流控制的新疆地区 ,还是季风环流影响的其它我国干旱、半干旱区 ,末次冰期气候变化均表现为早晚期的干冷期和中期的温湿期 ,尽管其干冷和温湿的程度不尽相同。

Based on the record of the loess section at Yuanbao in Linxia of the middle-later last Glacial period,a comparative analysis was made using the section and the selected contemporaneous isopic and heteropic climatic records in the arid and semiarid zones of China.The results showed that the climate in the westerly airflow-controlled Xinjiang region as a whole was relatively dry and cold during the Holocene but became warmer in the later stage,furthermore,both the fluctuation amplitude and frequency in the climate were small.The climate in other regions controlled by monsoon circulation during the Holocene exhibited a similar variation laws,namely the fluctuated rise in temperature during the early Holocene;the steady warm period during the middle Holocene ;and the climate cooling during the late Holocene,furthermore,both the fluctuation amplitude and frequency were faster.However,whether the westerly airflow-controlled by monsoon Xinjiang region or China's other arid and semiarid regions controlled by monsoon circulation the climate appeared as cold and try ones in the early and late stages and warm and wet one in the middle stage during the last glacial period,although the dry-cold and warm-wet degrees were not the same.