土壤水分和降水之间有很强的合的地区
Randal D Koster1, Paul A Dirmeyer, Zhichang Guo
1NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. randal.d.koster@nasa.gov
概括
这项研究估计了土壤湿度异常在北半球夏季影响降雨的地点. 这项研究通过了解陆地与大气相互作用,有助于改善季节性降雨预报.
科学领域:
- 气候科学 气候科学
- 大气科学 大气科学
- 水文学的水文学
背景情况:
- 估计陆地-大气相互作用,特别是土壤湿度对降水的影响,由于观测数据有限和依赖单个计算模型而具有挑战性.
- 以前的方法受到模型依赖的限制,阻碍了对土壤湿度-降水反的可靠评估.
研究的目的:
- 为了确定全球地区,土壤湿度异常影响降雨在北半球夏季期间.
- 通过使用协调的多模型方法来克服先前估计的局限性.
- 为改善季节性降雨预测提供基础.
主要方法:
- 一个协调的数值实验是由多个气候建模组进行的.
- 在参与模型中使用了一种标准化,高度控制的模拟.
- 结果被汇总起来,以创建土地-大气合强度的多模型估计.
主要成果:
- 在全球范围内确定了特定的地区,土壤水分在北半球夏季显著影响降雨量.
- 通过多模组合方法证明了这些发现的稳定性.
- 量化了土壤水分异常对降水模式的影响.
结论:
- 多模型比较提供了比单模型研究更可靠的土地-大气相互作用估计.
- 了解土壤水分在降水中的作用对于提高季节性气候预测至关重要.
- 这项协调的实验有助于评估气候模型对土壤湿度变化的反应.
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