...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of hydrometeorology >A New Method for Exploring Coupled Land-Atmosphere Dynamics
【24h】

A New Method for Exploring Coupled Land-Atmosphere Dynamics

机译：探索陆地-大气耦合动力学的新方法

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

This paper proposes a new method for investigating coupled land-atmosphere interactions. The method is to apply an empirical correction technique to distinct components of a model and then examine differences between forecasts of the empirically corrected models. The correction technique is based on adding a time-dependent term to the tendency equations that subtracts the estimated tendency error at every time step. This methodology can be interpreted more generally as a series of data assimilation experiments in which only certain components of a coupled model are assimilated at a time. The correction is applied to a state-of-theart coupled land-atmosphere model in three different ways, namely, to the atmosphere only, to the land only, and to the land and atmosphere simultaneously. The land-atmosphere interactions are inferred from monthly-mean differences between experiments. The results suggest that the land-atmosphere coupling in midlatitudes can be understood from straightforward water balance considerations, whereas the coupling in the deep tropics involves a more complicated change in regional circulation. Specifically, in midlatitudes, moisture injected into the soil is transferred to the atmosphere directly above, which in turn advects downstream and subsequently moistens the atmosphere in the downwind regions to produce positive precipitation anomalies. In the deep tropics, the regional circulation, including precipitation, is sensitive to perturbations and has no obvious relation to corrections in the atmosphere or land. The similarity of biases among different models suggests that the conclusions and methodology may be relevant to other models.
机译：本文提出了一种新的方法来研究土地-大气之间的相互作用。该方法是将经验校正技术应用于模型的不同组成部分，然后检查经验校正模型的预测之间的差异。校正技术基于在趋势方程中添加时间相关项，该项在每个时间步均减去估计的趋势误差。这种方法可以更一般地解释为一系列数据同化实验，其中一次仅对耦合模型的某些组件进行同化。该校正以三种不同的方式应用于最新的陆地大气耦合模型，即仅应用于大气，仅应用于陆地以及同时应用于陆地和大气。从实验之间的月均值差异可以推断出陆地与大气之间的相互作用。结果表明，可以从直接的水平衡考虑因素来理解中纬度地区的陆-气耦合，而深热带地区的耦合涉及区域环流的更复杂变化。具体而言，在中纬度地区，注入土壤的水分会直接转移到上方的大气中，然后又向下游平流，随后使顺风地区的大气变湿，从而产生正降水异常。在深热带地区，包括降水在内的区域环流对扰动敏感，与大气或陆地的校正没有明显关系。不同模型之间偏差的相似性表明，结论和方法可能与其他模型有关。

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