Atmospheric Trace Gases and Global Climate

PI一直在使用NCAR群落气候模式第1版（CCM1）与混合层海洋相结合，研究二氧化碳和其他微量气体（OTGs） CH4、N2O、CFC13和CF2C12的气候影响。他的实验表明，otg为地球-大气气候系统提供了重要的热源。由于CO2的辐射强迫行为与OTGs非常不同，因此PI的模式模拟表明，不同的辐射强迫会导致截然不同的气候效应。本研究项目将继续研究气候反馈。提出了三个任务。首先是CCM1模拟的详细诊断，重点是气候反馈。第二，利用CCM2研究co2和OTGs的气候效应。CCM2包括物理和动力参数化的重大改进，对气候研究更加现实。因此，比较大气微量气体对CCM1和CCM2的气候影响，为研究它们对模式公式的敏感性提供了一个独特的机会。第三项任务是评估云光学特性的反馈效应，云光学特性已被确定为气候变化过程中一个潜在的强负反馈机制。这项研究很重要，因为它试图增加对微量气体如何影响气候的理解。

The PI has been using the NCAR community climate model version one (CCM1) coupled with a mixed layer ocean to study the climatic effects of CO2 and other trace gases (OTGs) CH4, N2O, CFC13 and CF2C12. His experiments suggest that OTGs provide an important heating source to the earth-atmospheric climate system. Because the radiative-forcing behavior of CO2 is very different from the OTGs, the PI's model simulations show that different radiative forcing can lead to quite different climatic effects. This research program will continue the study with emphasis on the climatic feedback. Three tasks are proposed. First a detailed diagnosis of CCM1 simulations with focus on climate feedback. Second, use of the CCM2 to study the climatic effects of C02 and OTGs. CCM2 includes major improvements in physical and dynamical parameterization and is much more realistic for climate studies. Therefore, comparisons of the climatic effects due to atmospheric trace gases between CCM1 and CCM2 offer a unique opportunity to study their sensitivity to model formulations. The third task is to evaluate the feedback effect of cloud optical properties, which has been identified potentially to be a strong negative feedback mechanism during climate changes. This research is important because it seeks to increase understanding of how trace gases influence climate.