EGU24-3659, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

The effects of ice nucleation parameterizations in GFDL climate model 

Huan Guo1 and Songmiao Fan2
Huan Guo and Songmiao Fan
  • 1GFDL, Princeton, United States of America (
  • 2GFDL, Princeton, United States of America (
We incorporated a temperature, dust, and sea spray aerosol-dependent ice nucleation parameterization in the recently developed GFDL AM4-MG2 framework, and refer to this new configuration as AM4-MG2-new. The major difference of the ice nucleation parameterizations in AM4-MG2-new and AM4-MG2 is the inclusion of sea spray aerosol as ice nucleating particles (INPs). Then we conducted AMIP (Atmospheric Model Intercomparison Project) mode simulation with AM4-MG2-new. It turns out that AM4-MG2-new produces mean model climate comparable to AM4-MG2, for example, similar cloud radiative and precipitation fields, but different cloud water phase partitioning or supercooled cloud fractions, especially over the mid-high latitudes where mixed-phase clouds (clouds that consist of both liquid and ice) are prevalent. The cloud-phase feedback could in turn impact the estimate of climate sensitivity. The results suggest that ice nucleation parameterizations, which have large uncertainties, have important impacts on climate sensitivity.

How to cite: Guo, H. and Fan, S.: The effects of ice nucleation parameterizations in GFDL climate model , EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-3659,, 2024.