讲座简介：
Compared to earlier versions of the Community Atmospheric Model (CAM3 and CAM4), CAM5 is designed to simulate fully interactive aerosol direct and indirect effects. The modal aerosol module (MAM) in CAM5 predicts both aerosol mass and number, and internal/external mixing between aerosol components. The aerosol interface with a two-moment stratiform cloud microphysics considers cloud droplet activation and ice nucleation in mixed-phase and cold ice clouds, to enable the treatment of aerosol indirect effect in CAM5.
In this talk, I will introduce the latest development I have been involved in the development of aerosols and aerosol-cloud interactions in CAM5. This includes:
(1) Implementation of a new treatment of secondary organic aerosols (SOA) based on the volatility basis-set (VBS). The new treatment produces much higher SOA burden and lifetime, especially in the free troposphere than the default MAM. Biomass burning is found to be the largest global SOA source;
(2) Implementation of the classical-nucleation-theory-based parameterization with a probability density function of contact angle to CAM5 to represent the heterogeneous ice nucleation. The relative importance of natural dust and black carbon (soot) and their competing effects on the phase partitioning of mixed-phase clouds are investigated. Model simulation of supercool liquid fraction in mixed-phase clouds in different regions are compared to observations from CloudSat/CALIPSO satellites.
At the end, future plans for the representations of aerosol and aerosol-cloud interactions in CAM5 will be highlighted.
主讲人简介：
刘小红, 美国怀俄明大学首席教授（Wyoming Excellence Chair），于1986年、1989年和1992年分别在南京大学获得学士、硕士和博士学位。1992年至1999年在中国科学院大气物理研究所工作，于1997年被聘为研究员。2006年至2013年在美国能源部太平洋西北国家实验室任高级科学家。2013年起在美国怀俄明大学大气科学系任“Wyoming Excellence Chair”首席教授。主要研究领域包括大气气溶胶对气候的直接和间接效应，大气气溶胶物理化学特性及循环过程的数值模拟。他是美国Community Earth System Model （CESM）/Community Atmospheric Model version 5 (CAM5)模式发展的核心成员，对CESM-CAM5模式中气溶胶、气溶胶－云相互作用模型的发展起重要作用。已发表论文100余篇，引用4300多次，H-index 32。他是国际“Atmospheric Chemistry and Physics” (ACP)杂志的编辑。获世界气象组织（WMO）青年科学家奖（2001年），德国洪堡学者（1996-1997年），入选中国科学院百人计划（1996-1999年）。 |
