Ice Microphysics in CAM

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Presentation transcript:

Ice Microphysics in CAM A. Gettelman, X. Liu, H. Morrison Gettelman - Ice AMWG 2008

Outline Motivation Tests of ice processes Exploration of explicit ice nucleation Allowing ice supersaturation Status and future plans Gettelman - Ice AMWG 2008

Motivation Cirrus and ice nucleation uncertain Supersaturation over ice common CAM does not permit it Cirrus radiative forcing important Cirrus affects stratospheric H2O Better description allows process level testing with observations Gettelman - Ice AMWG 2008

Ice Microphysics in MG Micro New microphysics has limited ice nucelation Ni=f(T) following Cooper (1986) Ni=const below -35C Goal Explore ice processes & sensitivity Bergeron Hallet Mossop ice multiplication Parameterize ice nucleation Allow supersaturation Gettelman - Ice AMWG 2008

Bergeron Process MG Micro Rotstayn Gettelman - Ice AMWG 2008 Green: Existing (Morrison), Black: Rotstayn 2000. Rotstayn scheme reduces peak liquid at small sizes and shifts to larger numbers Also broadens ice number PDF. Increases magnitude of cloud forcing by 3W/m2, with change to TOA of -0.5W/m2 (SW increases slightly more than longwave). IWP changes less than 5% Not clear which is better. Gettelman - Ice AMWG 2008

Ice Nucleation Add ice nucleation treatment of Liu & Penner 2005, following Liu et al 2007 Homogenous and Heterogenous immersion nucleation Relax Zhang et al closure for ice to allow supersaturation (C-E w.r.t. liquid) Based on parameterizing nucleation results from a detailed parcel model Pro: detailed model Con: lots of fixed numbers Gettelman - Ice AMWG 2008

Liu et al 2007: in CAM3.0 LIU CAM MLS RHi Gettelman - Ice AMWG 2008

Initial Testing w/ MG micro Code runs in new microphysics Produces lots of supersaturation Not enough ice generated Need to work out: Depletion of vapor in presence of ice (vapor deposition appears insufficient) Adjustments to reflect sub-grid variability Gettelman - Ice AMWG 2008

SCAM & Global Tests Doubled High Cloud fraction Increase in RH, lots of supersaturation 70% Decrease in Cld Ice 30% Decrease in net CF (LW & SW) Main issues: Need better constraints on ice processes Account for sub-grid variability Gettelman - Ice AMWG 2008

Allowing Supersaturation Goal: adjust closure for supersaturation Principle: Separate ice and liquid cloud fractions Bulk condensation only w.r.t water (liquid). Ice formation requires Existing ice Explicit (parameterized) ice nucleation Process rates & sedimentation govern ice Ice cloud fraction determined using IWC closure Gettelman - Ice AMWG 2008

New ‘ICECLDF’ Cloud Fractions. SCAM, ARM Site IOP Ice Liquid Total Gettelman - Ice AMWG 2008

Status Done initial coding: Works with MG scheme & ice nucleation separate ice and liquid clouds structure for closure in place Works with MG scheme & ice nucleation Testing IWC closure now Use empirical relation for IWC =f(T) Expand to better IWC = f(T, Rei, Ni, etc) Needs a good conceptual re-think Goal: still try for CAM4 Don’t see major impact on run-time Better physical basis, easier to compare to obs Gettelman - Ice AMWG 2008

Summary Ice microphysics changes are small, but not negligible Modifies relative sizes/numbers of drops and ice in mixed phase Partitioning of mixed phase affects CF Ice nucleation treatments show promise Separate ice cloud variable possible: better physical representation, better constrained by observations More work to be done: stay tuned! Gettelman - Ice AMWG 2008