Abstract:
The MAT1NXLND or tavg1_2d_lnd_Nx data product is the MERRA Data Assimilation System 2-Dimensional land surface diagnostic that is time averaged single-level at the native resolution. It is a history file that is produced from the GCM during the corrector segment of the IAU cycle. All collections from this group are at reduced horizontal resolution. MERRA, or the Modern Era Retrospective-analysis ... for Research and Application, is a NASA reanalysis for the satellite era (30 years 1979-current) using the Goddard Earth Observing System Data Assimilation System Version 5 (GEOS-5 DAS).
This data product contains 2-dimensional fields that do not vary during the reanalysis. Parameters include:
GRN - Vegetation greenness fraction LAI - Leaf area index GWETROOT - Root zone soil wetness GWETTOP - Top soil layer wetness TPSNOW - Top snow layer temperature TUNST - Surface temperature of unsaturated zone TSAT - Surface temperature of saturated zone TWLT - Surface temperature of wilted zone PRECSNO - Surface snowfall PRECTOT - Total surface precipitation SNOMAS - Snow mass SNODP - Snow depth EVPSOIL - Bare soil eEvaporation EVPTRNS - Transpiration EVPINTR - Interception loss EVPSBLN - Sublimation RUNOFF - Overland runoff BASEFLOW - Baseflow SMLAND - Snowmelt FRUNST - Fractional unsaturated area FRSAT - Fractional saturated area FRSNO - Fractional snow-covered area FRWLT - Fractional wilting area PARDF - Surface downward PAR diffuse flux PARDR - Surface downward PAR beam flux SHLAND - Sensible heat flux from land LHLAND - Latent heat flux from land EVLAND - Evaporation from land LWLAND - Net downward longwave flux over land SWLAND - Net downward shortwave flux over land GHLAND - Downward heat flux at base of top soil layer TWLAND - Total water store in land reservoirs TELAND - Energy store in all land reservoirs WCHANGE - Total land water change per unit time ECHANGE - Total land energy change per unit time
The data are on the GEOS-5 native 540 x 361 grid with 2/3° longitude x 1/2° latitude resolution. Data are archived in the HDF-EOS (Grid) format, based on HDF4.
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