基于层积云飞机观测资料评估气溶胶间接效应
DOI:
作者:
作者单位:

南京信息工程大学大气物理学院

作者简介:

通讯作者:

基金项目:

国家重点基础研究发展计划(973计划);国家自然科学基金项目(面上项目,重点项目,重大项目)


Evaluation of aerosol indirect effect based on aircraft observations of stratocumulus
Author:
Affiliation:

1.School of Atmospheric Physics,Nanjing University of Information Science &2.amp;3.Technology;4.School of Atmospheric Physics,Nanjing University of Information Science & Technology

Fund Project:

The National Basic Research Program of China (973 Program);The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    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(AIEn)和根据有效半径定义的值(AIEs)。AIEn几乎都比AIEs大,尤其在中等含水量条件下。理论推导表明,AIEn与AIEs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AIEn加上离散度效应后,数值与AIEs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下最大,当含水量为0.24 g/m3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。

    Abstract:

    Using the aircraft observation data of the stratocumulus during the Routine AAF [Atmospheric Radiation Measurement (ARM) Aerial Facility] Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) field campaign in April and May 2009, two methods are used to estimate the indirect aerosol effects: using the values defined by cloud drop concentration (AIEn) and by effective radius (AIEs). AIEn is almost always larger than AIEs, especially at moderate liquid water content. Theoretical derivation shows that the deviation between AIEn and AIEs should be related to the effect of aerosol on the dispersion of cloud droplet spectrum, e.g., the dispersion effect. When AIEn adds the dispersion effect, the value is very close to AIEs, confirming the theoretical expectations. The contribution of the dispersion effect to the aerosol indirect effect is mainly the offset effect, which is the largest at moderate liquid water content, reaching about 37% when liquid water content is 0.24 g/m3. The research results enhance the theoretical understanding of the aerosol-cloud interaction and will be helpful to improve the accurate assessment of the aerosol indirect effect in models and observations.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:2020-06-13
  • 最后修改日期:2020-07-30
  • 录用日期:2020-08-16
  • 在线发布日期:

地址:江苏南京,宁六路219号,南京信息工程大学    邮编:210044

联系电话:025-58731158    E-mail:xbbjb@nuist.edu.cn    QQ交流群号:344646895

大气科学学报 ® 2020 版权所有  技术支持:北京勤云科技发展有限公司