EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Validation of Satellite-Retrieved CCN based on a Cruise Campaign over the polluted Northwestern Pacific Ocean 

Yichuan Wang1, Yannian Zhu1,2, Minghuai Wang1,2, Daniel Rosenfeld1,3, Yang Gao4,5, Xiaohong Yao4,5, Lifang Sheng6,7, Avichay Efraim3, and Juntao Wang4
Yichuan Wang et al.
  • 1School of Atmospheric Sciences, Nanjing University, 210023 Nanjing, China
  • 2Joint International Research Laboratory of Atmospheric and Earth System Sciences & Institute for Climate and Global Change Research, Nanjing University, China
  • 3Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
  • 4Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, China
  • 5Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
  • 6Department of Marine Meteorology, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266100, China
  • 7Ocean-Atmosphere Interaction and Climate Laboratory, Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao, 266100, China

In this study, a methodology for satellite retrieval of cloud condensation nuclei (CCN) in shallow marine boundary layer clouds is presented and validated. This methodology is based on retrieving cloud base drop concentration (Nd) and updrafts (Wb), which are used for calculating supersaturation (S). The Nd is the activated CCN concentration in clouds at a given S. The accuracy of the satellite retrieval is validated against the surface-measured CCN of a cruise campaign over the heavily polluted northwest Pacific Ocean. Clouds which are coupled with the sea surface have good agreement between satellite retrieved Nd and surface-measured CCN after performing corrections for temperature and adiabatic fraction. This study broadens the applicability of the methodology from aerosol-limited to contaminated regions. The validation shows ±30% accuracy in retrieving CCN of both clean and polluted regions. The results further demonstrate the strong dependence of marine shallow cloud Nd on CCN number concentrations and updraft, which allows us to further apply this methodology to quantify the relationships between CCN and cloud microphysical properties and reduce the uncertainty of radiation forcing caused by aerosol cloud interaction (ACI).

How to cite: Wang, Y., Zhu, Y., Wang, M., Rosenfeld, D., Gao, Y., Yao, X., Sheng, L., Efraim, A., and Wang, J.: Validation of Satellite-Retrieved CCN based on a Cruise Campaign over the polluted Northwestern Pacific Ocean , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-3754,, 2021.

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