Resoltuion Requirements and Numerical Convergence Rates of Hydrological Processes in Climate Simulation

本研究的目的是估算水文和能量循环的三个关键气候要素的数值收敛速率，从而量化不同分辨率下数值近似的误差。这三个要素是：i)大气和海洋之间的水汽垂直通量，ii)边界层喷流中的水汽水平通量，以及iii)分数云量对模式分辨率的敏感性。该方法将使用一种可伸缩的变分辨率全球模型，该模型能够在局部分辨出比其他均匀分辨率气候模型多得多的结构。垂直边界层分辨率将有选择地增强以研究第(i)项，水平分辨率将局部增强以明确地解析中尺度结构以研究第（ii）项和第（iii）项。这项研究很重要，因为它试图更好地了解海洋和大气之间的水蒸气输送，这是全球水循环的关键组成部分。本研究得到了全球变化全球能源和水循环实验（GEWEX）的部分支持。

The objective of this research is to estimate the numerical convergence rate of three key climate elements of hydrological and energy cycles, and to thereby quantify the error of numerical approximations at different resolutions. The three elements are: i)vertical fluxes of water vapor between the atmosphere and ocean, ii) horizontal fluxes of water vapor in boundary layer jets, and iii) sensitivity of fractional cloud cover to model resolution. The methodology will be to use a telescoping, variable resolution global model that is capable of locally resolving far more structure than are other uniform resolution climate models. The vertical boundary layer resolution will be selectively enhanced to study item (i) and the horizontal resolution will be locally enhanced to explicitly resolve mesoscale structures to study items (ii) and (iii). The study is important because it seeks to better understand water vapor transports between the oceans and atmosphere, a key component of the global water cycle. This research is supported partially by the Global Change Global Energy and Water Cycle Experiment (GEWEX).