- Dataset Availability
- 1980-01-01T00:00:00Z–2024-09-01T23:00:00Z
- Dataset Provider
- NASA/MERRA
- Earth Engine Snippet
-
ee.ImageCollection("NASA/GSFC/MERRA/flx/2")
- Tags
Description
M2T1NXFLX (or tavg1_2d_flx_Nx) is an hourly time-averaged data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of assimilated surface flux diagnostics, such as total precipitation, bias corrected total precipitation, surface air temperature, surface specific humidity, surface wind speed, and evaporation from turbulence. The "surface" in this data collection is the model surface layer. The heights of the model surface layer (HLML) vary with time and location, with the value of ~60 meters above ground. The data field is time-stamped with the central time of an hour starting from 00:30 UTC, e.g.: 00:30, 01:30, ... , 23:30 UTC.
MERRA-2 is the latest version of global atmospheric reanalysis for the satellite era produced by NASA Global Modeling and Assimilation Office (GMAO) using the Goddard Earth Observing System Model (GEOS) version 5.12.4. The dataset covers the period of 1980-present with the latency of ~3 weeks after the end of a month.
Bands
Resolution
69375 meters
Y Resolution
55000 meters
Bands
Name | Units | Min | Max | Description |
---|---|---|---|---|
BSTAR |
m/s^2 | -0.021035* | 0.791739* | Surface buoyancy scale |
CDH |
kg/m^2/s | 8e-06* | 0.522482* | Surface exchange coefficient for heat |
CDM |
kg/m^2/s | 5e-06* | 0.518079* | Surface exchange coefficient for momentum |
CDQ |
kg/m^2/s | 8e-06* | 0.522482* | Surface exchange coefficient for moisture |
CN |
0.000646* | 0.032227* | Surface neutral drag coefficient |
|
DISPH |
m | 0* | 23.0781* | Zero plane displacement height |
EFLUX |
W/m^2 | -308.949* | 1655.85* | Total latent energy flux |
EVAP |
kg/m^2/s | -0.00011* | 0.000673* | Evaporation from turbulence |
FRCAN |
0* | 1* | Areal fraction of anvil showers |
|
FRCCN |
0* | 0.423096* | Areal fraction of convective showers |
|
FRCLS |
0* | 1* | Areal fraction of nonanvil large scale showers |
|
FRSEAICE |
0* | 1* | Ice covered fraction of tile |
|
GHTSKIN |
W/m^2 | -245.078* | 1e+15* | Ground heating for skin temperature |
HFLUX |
W/m^2 | -1181.24* | 686.742* | Sensible heat flux from turbulence |
HLML |
m | 42.3642* | 71.0599* | Surface layer height |
NIRDF |
W/m^2 | 0* | 282.495* | Surface downwelling nearinfrared diffuse flux |
NIRDR |
W/m^2 | 0* | 592.217* | Surface downwelling nearinfrared beam flux |
PBLH |
m | 42.3621* | 5780.88* | Planetary boundary layer height |
PGENTOT |
kg/m^2/s | 0* | 0.017593* | Total column production of precipitation |
PRECANV |
kg/m^2/s | 0* | 0.000968* | Anvil precipitation |
PRECCON |
kg/m^2/s | 0* | 0.002629* | Convective precipitation |
PRECLSC |
kg/m^2/s | 0* | 0.014614* | Nonanvil large scale precipitation |
PRECSNO |
kg/m^2/s | 0* | 0.006308* | Snowfall |
PRECTOTCORR |
kg/m^2/s | 0* | 0.110565* | Total precipitation |
PRECTOT |
kg/m^2/s | 0* | 0.017509* | Total precipitation |
PREVTOT |
kg/m^2/s | 0* | 0.001474* | Total column re-evaporation/sublimation of precipitation |
QLML |
0* | 0.034333* | Surface specific humidity |
|
QSH |
Mass fraction | 0* | 0.044069* | Effective surface specific humidity |
QSTAR |
Mass fraction | -0.000139* | 0.005463* | Surface moisture scale |
RHOA |
kg/m^3 | 0.658498* | 1.68283* | Air density at surface |
RISFC |
-318.273* | 578.05* | Surface bulk Richardson number |
|
SPEEDMAX |
m/s | 0.074227* | 49.4767* | Surface wind speed |
SPEED |
m/s | 0.061141* | 49.3541* | Surface wind speed |
TAUGWX |
N/m^2 | -3.06294* | 5.8716* | Surface eastward gravity wave stress |
TAUGWY |
N/m^2 | -5.10649* | 4.99554* | Surface northward gravity wave stress |
TAUX |
N/m^2 | -5.48865* | 5.09378* | Eastward surface stress |
TAUY |
N/m^2 | -6.19036* | 4.19191* | Northward surface stress |
TCZPBL |
m | 6.55864* | 2.83712e+06* | Transcom planetary boundary layer height |
TLML |
K | 191.833* | 320.174* | Surface air temperature |
TSH |
K | 185.73* | 328.859* | Effective surface skin temperature |
TSTAR |
K | -11.0761* | 5.74402* | Surface temperature scale |
ULML |
m/s | -48.8082* | 42.8239* | Surface eastward wind |
USTAR |
m/s | 0.000667* | 2.31844* | Surface velocity scale |
VLML |
m/s | -41.9408* | 44.3777* | Surface northward wind |
Z0H |
m | 1e-05* | 4.54622* | Surface roughness for heat |
Z0M |
m | 1e-05* | 4.54622* | Surface roughness |
Terms of Use
Terms of Use
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Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee.ImageCollection('NASA/GSFC/MERRA/flx/2') .filter(ee.Filter.date('2022-02-01', '2022-02-02')); var surface_buoyancy_scale = dataset.select('BSTAR'); var sbsVis = { min: -0.00998, max: 0.01174, palette: ['001137', '01abab', 'e7eb05', '620500'] }; Map.setCenter(-95, 39, 2); Map.addLayer(surface_buoyancy_scale, sbsVis, 'Surface buoyancy scale');