...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of hydrometeorology >Trends in land evapotranspiration over Canada for the period 1960-2000 based on in situ climate observations and a land surface model
【24h】

Trends in land evapotranspiration over Canada for the period 1960-2000 based on in situ climate observations and a land surface model

机译：基于原位气候观测和地表模型的1960-2000年加拿大陆地蒸散量趋势

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An assessment of annual trends in actual evapotranspiration (AET) and associated meteorological inputs is performed at 101 locations across Canada with available long-term hourly surface climate observations to determine if AET in Canada is increasing in relation to observed increases in air temperature. AET was estimated for the dominant land cover class, with representative soil and leaf area index conditions, within a 50 km x 50 km window around each location for the period 1960-2000. The Ecological Assimilation of Land and Climate Observations (EALCO) land surface model, which simulates coupled carbon, energy, and water cycles, was applied to estimate AET on a half-hourly basis at each location using in situ meteorological measurements and ambient atmospheric CO2 concentrations. Increases in annual AET, of up to 0.73% yr(-1), were identified at 81 locations, and decreases, of up to 0.25% yr(-1), were found at the remaining 20 stations. Statistically significant increasing trends were detected in 35% of the locations with the majority corresponding to Atlantic and Pacific coastal regions. Increasing trends were generally related to increasing temperature and total downwelling surface radiation trends in eastern Canada and increasing temperature, surface radiation, and precipitation trends in western Canada. In sharp contrast to other studies based on simpler AET models, annual AET trends in the prairie climate zone were mixed in terms of increases and decreases with no locations showing statistically significant trends. Future studies focused on scaling AET model estimates to subbasins or basins are required both to account for this spatial variability in soil conditions and to permit water budget closure validation.
机译：在加拿大的101个地点对实际蒸散量（AET）和相关的气象输入的年度趋势进行了评估，并提供了长期的每小时小时地面气候观测，以确定加拿大的AET相对于观测到的气温升高是否正在增加。在1960-2000年期间，围绕每个位置的50 km x 50 km窗口内，具有代表性土壤和叶面积指数条件的主要土地覆盖类别的AET估计值。土地和气候观测的生态同化（EALCO）地表模型模拟了碳，能量和水的耦合循环，使用原位气象测量和周围大气中的CO2浓度在每个位置每半小时估算一次AET 。在81个地点确定了年度AET的增加，最高可达0.73％yr（-1），而在其余20个站点上，则发现了最高0.25％yr（-1）的下降。在35％的地区中发现了具有统计意义的显着增长趋势，其中大部分与大西洋和太平洋沿海地区相对应。趋势的增加通常与加拿大东部的温度升高和整个下行井表面辐射趋势以及加拿大西部的温度，表面辐射和降水趋势升高有关。与基于简单AET模型的其他研究形成鲜明对比的是，草原气候区的年度AET趋势在增加和减少方面是混杂的，没有位置显示出统计学上的显着趋势。需要进行未来的研究，重点是将AET模型估计值缩放到子盆地或盆地，以解决土壤条件中的这种空间变化并允许水预算关闭验证。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号