摘要
通过对我国东部季风区现代表土样品孢粉组合与气候因子之间的回归分析，分别建立了孢粉组合与一月、七月气温和年降水量的转换函数，进而建立了本区末次冰期以来的孢粉－气候数据库，模拟了末次冰期盛冰期、消冰期、全新世前北方期－北方期、大西洋期、亚北方期等五个古气候期的冬季和夏季温度场、降水场。结果表明：１）本区气候变率与全球气候变率明显不同。其中，末次冰期盛冰期的降温幅度低于欧洲大陆，而全新世高温期的升温幅度则比欧洲大；２）无论末次冰期还是全新世各气候期，气温和降水量的纬度地带性规律仍然存在，表现在气温的南高北低和降水量的南多北少；３）各气候转型期，本区气候湿热组合特征也与现代一致，表现为雨热同期。
In this paper, the east China monsoon area was employed to be a study region. First of all, to meet the need of numerical simulations, the transfer functions between sporopollen assemblage and mean temperature of January and July as well as annual mean precipitation are established based upon regression analyses of the relationship between sporopollen assemblage from modern surface soil and climatic factors such as temperature and precipitation. Mathematically, the relationship between them is linear. Based on this, a great deal of sporopollen data dated by radio carbon isotope from this area were construed into pollen climate parameters, consequently, the pollen climate data of this are since the Last Glaciation are simulated. Conclusively, utilizing these data from pollen climate database, the temperature and precipitation field of the last Glacial Maximum, Last Deglaciation, and Holocene Pre Boreal phase, Atlantic phase, Sub Boreal phase were simulated quantitatively. The results are as the following: 1) Not only in the Last Glaciation Maximum, but also in Holocence Maximum, the climatic deviations of this area differed greatly from other continents, among them,the detemperature range in the Last Glacial Maximum was Smaller than that of Europe, whereas the risetemperature range in the Holocene Maximum was larger than that of Europe; 2) As much in Last Glaciation as in Holocene,the latitudial zonality of temperature and precipitation existed already,characterized by high temperature in south and low in north,and much precipitation in south and less in north; 3) In this area, the assemblage of humidity and thermal energy was also coincident with that of nowadays,characterized by synchronization of high temperature and ample precipitation.
出处
《长江流域资源与环境》
CAS
CSCD
1998年第3期260-266,共7页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金
南京大学现代分析测试中心基金
关键词
中国东部
季风区
末次冰期
古气候
模拟
east China monsoon area, Last Glaciation, Holocene, paleoclimatic factors field, quantitative simulation
