黑碳气溶胶对我国区域气候影响的数值模拟

利用区域气候模式RegCM3模拟研究了黑碳气溶胶对我国区域气候的影响。以2000年1、4、7、10月为代表,计算分析了黑碳气溶胶的辐射强迫作用、对大气温度和降水的影响及其季节变化特征。模拟结果显示：黑碳气溶胶在大气层顶产生正的辐射强迫,在地表产生负的辐射强迫;黑碳气溶胶的加入使中国大陆地区地面温度发生明显变化,并呈现显著的季节特征,即1月大部分地区的地面温度均有升高;7月北方增温、南方降温;4月和10月地面温度的变化不明显。模拟结果也表明,黑碳气溶胶的排放使我国长江中下游等南方地区夏季降水增加,而北方部分地区降水减少。

Numerical Simulations of Effect of Black Carbon Aerosol on Regional Climate in China

The Regional Climate Model version 3 （ RegCM3 ） is used to investigate the effect of black carbon（BC） aerosol on regional climate in China. The influences of BC aerosol on the radiative forcing, air temperature, and rainfall are analyzed. The simulation result shows that BC aerosol produces a positive radiative forcing at the atmosphere top, and a negative forcing at the surface in the region. Adding of BC aerosol causes distinct changes in surface air temperature in the continental area of China, and the changes show obvious seasonal characteristics. The surface temperature increases in most regions in January, whereas it increases in northern China and decreases in southern China in July, and it does not change significantly in April and October. The result also shows that BC aerosol emission leads to the increase of summer rainfall in the mid and lower reaches of Yangtze River, but results in rainfall reduction in some regions of northern China.