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Title: Simulating Southern Ocean Aerosol and Ice Nucleating Particles in the Community Earth System Model Version 2

Journal Article · · Journal of Geophysical Research. Atmospheres
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [3];  [3]; ORCiD logo [8]; ORCiD logo [9]
  1. National Center for Atmospheric Research (NCAR), Boulder, CO (United States); National Center for Atmospheric Research
  2. National Center for Atmospheric Research (NCAR), Boulder, CO (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  3. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  4. Colorado State University, Fort Collins, CO (United States)
  5. NorthWest Research Associates, Redmond, WA (United States)
  6. University of Colorado Boulder, CO (United States)
  7. University of Colorado Boulder, CO (United States); Handix Scientific Inc., Boulder, CO (United States)
  8. Australian Antarctic Division (Australia); University of Tasmania (Australia)
  9. Cooperative Institute for Severe and High Impact Weather Research and Operations, Norman, OK (United States); University of Oklahoma, Norman, OK (United States)

Southern Ocean (SO) low-level mixed phase clouds have been a long-standing challenge for Earth system models to accurately represent. While improvements to the Community Earth System Model version 2 (CESM2) resulted in increased supercooled liquid in SO clouds and improved model radiative biases, simulated SO clouds in CESM2 now contain too little ice. Previous observational studies have indicated that marine particles are major contributor to SO low-level cloud heterogeneous ice nucleation, a process that initiates a number of cloud processes that govern cloud radiative properties. In this study, we utilize detailed aerosol and ice nucleating particle (INP) measurements from two recent measurement campaigns to assess simulated aerosol abundance, number size distributions, and composition and INP parameterizations for use in CESM2. Our results indicate that CESM2 has a positive bias in simulated surface-level total aerosol surface area at latitudes north of 58°S. Measured INP populations were dominated by marine INPs and we present evidence of refractory INPs present over the SO assumed here to be mineral dust INPs. Results highlight a critical need to assess simulated mineral dust number and size distributions in CESM2 in order to adequately represent SO INP populations and their response to long-term changes in atmospheric transport patterns and land use change. Furthermore, we also discuss important cautions and limitations in applying a commonly used mineral dust INP parameterization to remote regions like the pristine SO.

Research Organization:
National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
SC0020098; SC0018626; SC0021159; SC0018929; SC0021116
OSTI ID:
1991918
Alternate ID(s):
OSTI ID: 1970057
Journal Information:
Journal of Geophysical Research. Atmospheres, Journal Name: Journal of Geophysical Research. Atmospheres Journal Issue: 8 Vol. 128; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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