MERRA-2 M2T1NXFLX: Surface Flux Diagnostics V5.12.4

NASA/GSFC/MERRA/flx/2
Dataset Availability
1980-01-01T00:00:00Z–2024-03-01T23:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GSFC/MERRA/flx/2")
Tags
merra sea-salt so2 so4 soil-moisture

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
* estimated min or max value

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');
 Open in Code Editor
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 …
NASA/GSFC/MERRA/flx/2, merra,sea-salt,so2,so4,soil-moisture
1980-01-01T00:00:00Z/2024-03-01T23:00:00Z
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