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| Parameterization (WRF namelist variable) | Choice (WRF code) | Reasons |
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| Longwave radiation (ra_lw_physics) | Rapid radiative transfer model (RRTM) (1) [20] | Accurate, fast, accounts for multiple bands, trace gases, and microphysics, commonly used, used in RoMANS I |
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| Shortwave radiation (ra_sw_physics) | Goddard, 2-stream multi-band scheme with ozone from climatology and cloud effects (2) [21, 22] | Recommended in WRF manual for similar scenarios |
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| Surface layer physics (sf_sfclay_physics) | Monin-Obukhov similarity theory provides exchange coefficients to surface scheme. (1) [23, 24] | Compatible with PBL scheme below, WRF manual often recommends, used in RoMANS I |
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| Land surface physics (sf_surface_physics) | Noah land surface model, unified NCEP/NCAR/AFWA scheme with soil temp and moisture in 4 layers, fractional snow cover and frozen soil physics. New features in WRF 3.1 for processes over ice and snow. (2) [25] | Used in NARR and RoMANS I, used operationally at NCEP, compatible with option for PBL scheme below |
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| Planetary boundary layer (PBL) physics (bl_pbl_physics) | Yonsei University scheme, non-local K scheme with explicit entrainment layer and parabolic K profile in unstable mixed layer (1) [26–28] | Used another scheme in RoMANS I that is now an “older scheme”
Findings of Hu et al. (2010) [28] that this had low biases, commonly used |
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| Microphysics (mp_physics) | WRF single-moment 5-class scheme, has mixed-phase and super-cooled water (4) [29] | Relatively cheap, includes super cooled water, snow melt, ice sedimentation, and time-split fall terms, suitable for mesoscale grid sizes |
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| Cumulus clouds (cu_physics) | Kain-Fritsch, deep and shallow convection subgrid scheme with mass flux approach, downdrafts and CAPE removal time scale, not used on 4-km domain (1) [30, 31] | Recommendation of WRF manual, commonly used scheme |
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