• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A NUMERICAL STUDY OF THE INFLUENCE OF THE DIURNAL CYCLE ON THE SURFACE ENERGY AND WATER BUDGETS
【24h】

A NUMERICAL STUDY OF THE INFLUENCE OF THE DIURNAL CYCLE ON THE SURFACE ENERGY AND WATER BUDGETS

机译：日循环对地表能量和水预算影响的数值研究

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

Global models including atmospheric, oceanic, and biogeochemical processes are needed for the study of possible environmental changes, but they require efficient approximations of physical processes in order to reduce the computing time. The need to resolve the diurnal cycle when treating such problems is questionable. The Interaction Soil Biosphere Atmosphere (ISBA) model describing soil-vegetation-atmosphere interactions is used to analyze the importance of the diurnal cycle on the surface energy and water budgets. Stand-alone simulations are first performed using the Hydrologic Atmospheric Pilot EXperiment-MOdelisation du BILan HYdrique (HAPEX-MOBILHY) and Amazonian Region Micrometeorological Experiment (ARME) data sets to assess the need of an explicit diurnal variation of the atmospheric forcing for different sites. As a reference, the run is forced by measured values of atmospheric variables and radiative fluxes. As a test, ISBA is run forced by the 24-hour means of these atmospheric and radiative forcings. The surface and deep water content, the total evaporation, and the net radiation flux are correctly evaluated without the diurnal cycle. In contrast, the interception reservoir is highly overestimated. The model is then coupled with a one-dimensional atmospheric model in which, as test, the solar flux at the top of the atmosphere is replaced by a daily constant mean insolation. The superficial soil moisture content and the total evapotranspiration flux are correctly estimated. The surface temperature and the sensible heat flux are not satisfactorily predicted. Thus it appears that neglecting the diurnal cycle is adequate when considering the hydrologic balance of the surface but not the surface temperature. [References: 17]
机译：研究可能的环境变化需要包括大气，海洋和生物地球化学过程在内的全局模型，但它们需要对物理过程进行有效近似，以减少计算时间。在解决此类问题时，需要解决昼夜周期问题。描述土壤－植被－大气相互作用的土壤生物圈相互作用模型（ISBA）用于分析昼夜循环对地表能量和水预算的重要性。首先使用比兰海德勒水文大气试验-模型化（HAPEX-MOBILHY）和亚马逊地区微气象实验（ARME）数据集进行独立模拟，以评估不同地点大气强迫的显式昼夜变化的需求。作为参考，运行是由大气变量和辐射通量的测量值决定的。作为测试，通过这些大气和辐射强迫的24小时手段来强制运行ISBA。在没有昼夜周期的情况下，可以正确评估地表水和深水含量，总蒸发量和净辐射通量。相反，拦截水库被高估了。然后将该模型与一维大气模型耦合，在该模型中，作为测试，大气层顶部的太阳通量被日均恒定日照量代替。正确估算了表层土壤水分含量和总蒸散通量。不能令人满意地预测表面温度和显热通量。因此，当考虑表面的水文平衡而不是表面温度时，忽略昼夜周期似乎是足够的。 [参考：17]

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