地球科学进展 ›› 2008, Vol. 23 ›› Issue (6): 619 -627. doi: 10.11867/j.issn.1001-8166.2008.06.0619

全球变化研究 上一篇    下一篇

中国东北三省1960—2005年地表干燥度变化趋势
王亚平 1,黄 耀 2,张稳 2   
  1. 1.南京农业大学资源与环境科学学院,江苏 南京 210095;2. 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京 100029
  • 收稿日期:2007-11-07 修回日期:2008-05-04 出版日期:2008-06-10
  • 通讯作者: 黄耀(1956-),男,江苏张家港人,研究员,主要从事全球变化与陆地碳氮循环模型研究. E-mail:huangy@mail.iap.ac.cn
  • 基金资助:

    国家自然科学基金重点项目“三江平原沼泽湿地垦殖对地—气碳交换和土壤碳库影响的研究”(编号:40431001);中国科学院知识创新工程重要方向性项目“我国减缓气候变化的碳汇管理与适应气候变化的对策研究”(编号:KZCX2-YW-305)资助.

Variation and Tendency of Surface Aridity Index from 1960 to 2005 in Three Provinces of Northeast China

Wang Yaping 1,Huang Yao 2,Zhang Wen 2   

  1. 1.College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China;2.LAPC,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China
  • Received:2007-11-07 Revised:2008-05-04 Online:2008-06-10 Published:2008-06-10

为研究气候变化对东北三省地表干湿状况的影响,利用该区1960—2005年72个气象站的观测资料,采用Penman-Monteith模型计算了各站的潜在蒸散量,由潜在蒸散量和降水量之比构建干燥度指数,并采用Kriging法进行空间插值以分析其区域特征。结果表明,该区地表干湿状况具有明显的时空变化特征。1960—1979年间,由于降水减少和潜在蒸散增加,地表干燥度指数呈增加趋势,水汽压差增大是潜在蒸散增加的主要原因;1980—2005年间,大部分地区地表干旱状况有所减缓,其中以黑龙江省和吉林东部尤为明显。降水增加和潜在蒸散减少是地表干旱状况趋缓的主要原因,风速降低和净辐射减小导致潜在蒸散减少。总体而言,气候变化并未加剧东北三省的干旱化。

To investigate the impact of climate change on surface dry-wet status in northeast China, aridity index in three provinces of Helongjiang, Jilin and Liaoning was calculated from 1960 to 2005 on the basis of meteorological datasets in 72 stations. The aridity index was defined as a ratio of potential-evapotranspiration to precipitation. Potential-evapotranspiration was computed by using Penman-Monteith model. Upscaling was completed by Kriging interpolation to address the spatial characters of aridity index. Results indicated that there was a variation in the dry-wet status with significant spatiotemporal characteristics in this region. Higher values of the aridity index occurred in the period from 1960 to 1979 and increased generally. The increase in the aridity index was attributed to a reduction in precipitation and an increase in potential-evapotranspiration that was induced by an augment in vapor pressure difference. By contrast, the surface in most of this region, particularly in Heilongjiang Province and the east part of Jilin Province, tended to be wetting during the period from 1980 to 2005 due to an increase in precipitation and a reduction in potential-evapotranspiration. The reduction in potential-evapotranspiration can be explained by a decline of wind speed and net radiation. As a whole, climate change did not aggravate surface aridity in three provinces of northeast China over the last several decades.

中图分类号: 

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