摘要
利用2009年4、5月美国浅薄低云观测项目(RACORO)的层积云飞机观测资料,使用两种方法对气溶胶间接效应进行了估算:根据云滴数浓度定义的值(AIE n)和根据有效半径定义的值(AIE s)。AIE n几乎都比AIE s大,尤其在中等含水量条件下。理论推导表明,AIE n与AIE s的偏差应与气溶胶对云滴谱离散度的影响有关,即离散度效应。当AIE n加上离散度效应后,数值与AIE s十分接近,证实了理论预期。离散度效应对气溶胶间接效应的贡献主要为抵消作用,这种抵消作用在中等含水量时最大,当含水量为0.24 g/m^(3)时达到37%左右。该研究成果增强了对气溶胶-云相互作用的理论认识,将有助于增强对模式和观测中气溶胶间接效应的准确评估。
By considering the aircraft observational data of the stratocumulus obtained during the Routine AAF(Atmospheric Radiation Measurement(ARM)Aerial Facility)Clouds with Low Optical Water Depths(CLOWD)Optical Radiative Observations(RACORO)field operation that was accomplished in April and May 2009,two approaches were adopted in order to estimate the aerosol incidental effects.The first effect was estimated by considering the cloud drop concentration(AIE n),while the second effect was estimated by considering the effective radius(AIE s).It was observed that the AIE n always owned the higher value in comparison with AIE s,and this alteration was more projecting especially at moderate liquid water content.Theoretical derivation established on the base of deviation between AIE n and AIE s indicated that the dispersion of cloud droplet spectrum influentially related to the effect of aerosol in the consideration of the dispersion effect.It was observed that when the dispersion effect increased the value of evaluated AIE n come closer to the evaluated value of AIE s,and the happening of this corresponds authenticated the theoretical expectations.The contribution of the dispersion effect in the consideration of the aerosol indirect effect was the leading offset effect,which owned the largest value at moderate liquid water content,and it was observed that when liquid water content is 0.24 g/m^(3)then its corresponding percentage was about 37%.The consequences of this research enhance the theoretical understanding of the aerosol-cloud interaction and it can be concluded that it could be helpful asset to improve the accurate assessment of the aerosol indirect effect in models and observations.
作者
陆春松
薛宇琦
朱磊
徐晓齐
LU Chunsong;XUE Yuqi;ZHU Lei;XU Xiaoqi(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science&Technology,Nanjing 210044,China)
出处
《大气科学学报》
CSCD
北大核心
2021年第2期279-289,共11页
Transactions of Atmospheric Sciences
基金
国家重点研发计划项目(2019YFA0606803)
江苏省自然科学基金杰出青年基金(BK20160041)
国家自然科学基金资助项目(41822504,41975181)
江苏省青蓝工程(R2018Q05)
江苏省六大人才高峰(2015-JY-011)。
关键词
气溶胶间接效应
离散度效应
飞机观测
aerosol indirect effect
dispersion effect
aircraft observation
