Commit b7f31dc
authored
2024 Updates and Bug Fixes for the P-X LSM (#2023)
Pleim-Xiu LSM MODIS LCZ Compatibility & Surface Evaporation Update
TYPE: bug fix & physics refinement
KEYWORDS: MODIS, LCZ, P-X LSM, Latent Heat Flux
SOURCE: Robert Gilliam & Jon Pleim, US EPA
DESCRIPTION OF CHANGES:
Problem:
User indicated that the P-X LSM errored for MODIS LCZ 61 NUM_LAND_CAT configuration.
Currently, we account for evaporation from transpiration, soil in both vegetated and non-veg parts, and wet leaves. But we only account for the latent heat effects on Tg from transpiration and evaporation from non-veg soil.
This fix adds latent heat effects on Tg from soil in vegetated parts and from wet leaves.
Fix for rare case where GRDFLX goes NaN because of a divide by zero based on a soil parameter when a water cell turns to sea ice.
Solution:
Logic checks in module_physics_init.F and module_sf_pxlsm.F were adjusted for 61 category inputs. P-X LSM data table, module_sf_pxlsm_data.F was updated for MODIS 61 categories. Default for LCZ 51-61 was set to MODIS urban class. We also added updates for the evaporation from vegetation and wet canopy.
ISSUE:
Fixes: #1965
LIST OF MODIFIED FILES:
M phys/module_physics_init.F
M phys/module_sf_pxlsm.F
M phys/module_sf_pxlsm_data.F
- Tested 61 class LCZ with PX LSM for a 1 day simulation with updated codes. Ran base MODIS 21 class scheme with same code before and after LCZ update. The results were identical after a 24 hour simulation. This confirms updates do not impact other MODIS settings in the P-X LSM. The MODIS 21 was by nature not identical to the MODIS 61, but similar enough and differences follow underlying differences in MODIS datasets.
- The Jenkins tests are all passing.
RELEASE NOTE:
Pleim-Xiu LSM is now compatible with 61 category MODIS LCZ landuse dataset. A mode of latent heat effects on Tg from vegetated parts and from wet leaves is added to Pleim-Xiu LSM.1 parent 9e265af commit b7f31dc
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