Collaborative Research: Validated Radiation and Convection Model Impacts on Climate Simulations

本研究将研究经数据验证的辐射模式RRTM对多年气候模拟的影响。以前的研究表明，RRTM在长波中提供的精度提高改变了CCM3模拟中的温度结构、水汽分布和热带环流。然而，RRTM和CCM3的短波对比显示出明显的晴空差异，这使得RRTM长波对某些地区CCM3影响的解释变得复杂。这里提出的实验将考虑长波和短波改进的影响。此外，通过比较rrtm模拟的光谱辐射和观测到的光谱辐射，CCM3模拟对流层上层水汽的能力存在实质性差异，这些水汽似乎与辐射无关。与麻省理工学院（PI Emanuel）的合作将研究对流在这一过程中的作用。

The impact of a data-validated radiation model RRTM, on multi-year climate simulations will be examined under this research effort. Previous work has shown that the improved accuracy provided by the RRTM in the longwave modifies the temperature structure, water vapor distribution, and tropical circulation in the CCM3 simulations. However comparisons between the RRTM and CCM3 in the shortwave show substantial clear sky differences that complicate the interpretation of the RRTM longwave impact on CCM3 in some regions. Experiments proposed here will consider the effect of both longwave and shortwave improvements. In addition, by comparing RRTM-modeled and observed spectral radiances, there are substantial discrepancies in the ability of the CCM3 to simulate upper tropospheric water vapor that appear unrelated to radiation. The collaboration with MIT (PI Emanuel) will examine the role of convection in this process.