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Data Product Description

Data for Rel. 4-IP is available for order from the LaRC/ASDC. Detailed documentation of this release is available within the Algorithm Theoretical Basis Document (ATBD).

Each data file contains an entire month of global fields of the parameters described below. The data files are available in netCDF-4 in various temporal levels by month.

The following diagram gives a general idea on how file names are constructed for the data set.

Cartoon of how to construct file names

Shortwave fluxes and associated fields

  • TOA insolation
  • TOA all-sky upward flux
  • TOA clear-sky upward flux
  • TOA pristine-sky upward flux
  • Surface all-sky upward flux
  • Surface clear-sky upward flux
  • Surface all-sky downward flux
  • Surface clear-sky downward flux
  • Surface pristine-sky downward flux
  • Surface all-sky diffuse downward flux
  • Solar zenith angle
  • Total cloud fraction
  • Par
  • Flux fill flag

Longwave fluxes and associated fields

  • TOA all-sky upward flux
  • TOA clear-sky upward flux
  • TOA pristine-sky upward flux
  • Surface all-sky upward flux
  • Surface clear-sky upward flux
  • Surface all-sky downward flux
  • Surface clear-sky downward flux
  • Surface pristine-sky downward flux
  • Tropopause all-sky upward flux
  • Tropopause clear-sky upward flux
  • Tropopause pristine-sky upward flux
  • Tropopause all-sky downward flux
  • Tropopause clear-sky downward flux
  • Tropopause pristine-sky downward flux
  • 200 hPa all-sky upward flux
  • 200 hPa clear-sky upward flux
  • 200 hPa pristine-sky upward flux
  • 200 hPa all-sky downward flux
  • 200 hPa clear-sky downward flux
  • 200 hPa pristine-sky downward flux
  • 500 hPa all-sky upward flux
  • 500 hPa clear-sky upward flux
  • 500 hPa pristine-sky upward flux
  • 500 hPa all-sky downward flux
  • 500 hPa clear-sky downward flux
  • 500 hPa pristine-sky downward flux
  • Flux fill flag
  • Day/night flag (3-hourly only)

Ancillary fields

Fields are only available as 3-hourly.

  • Surface skin temperature
  • Temperature at 2 meters
  • Specific humidity at 2 meters
  • Total column precipitable water
  • Snow and ice land coverage percent
  • Day/Night flag (day=1, night=0)
  • Total cloud area fraction
  • Total cloud top pressure
  • Total cloud top temperature
  • Total cloud optical Depth
  • Surface Pressure
  • Total column ozone
  • Longwave Surface Emissivity for 12 Fu-Liou bands

Cloud fields for ice or water cloud fields for high, middle, and low levels:

  • Cloud area fraction
  • Cloud optical depth
  • Cloud particle size
  • Cloud top temperature
  • Cloud top pressure
  • Cloud base pressure
  • Cloud water or ice content
  • Cloud thickness
  • Fill method flag for cloud data

Derivable fields

While not directly offered in the data files, the following can be derived from the available fields:

Parameter Procedure
Net Longwave Flux Radiation at Earth’s Surface, (NLF)s [W/m2] From the downward LW flux (DLF) and upward LW flux (ULF) as:

(NLF)s = (DLF)s – (ULF)s
Net fluxes can be computed for the clear-sky and all-sky conditions.
Longwave Cloud Radiative Effect, (LWCRE) at the surface, (>0, energy to the surface increased by clouds) [W/m2] From the Surface all-sky downward LW flux all(DLF)s and Surface clear-sky downward flux LW Flux clr(DLF)s as:

LWCREs= all(DLF)sclr(DLF)s
Longwave Cloud Radiative Effect, (LWCRE) at the TOA, (primarily >0, clouds remit at colder temperatures, energy stays in atmosphere) [W/m2] From the TOA all-sky upward LW flux all(ULF)toa and TOA clear-sky upward LW flux clr(ULF)toa as:

LWCREtoa= clr(ULF)toaall(ULF)toa
Net Longwave Flux of the Atmosphere, (NLF)atm, [W/m2] From the Net Longwave Flux at TOA (NLF)TOA and the Net Longwave Flux at surface (NLF)s as:

(NLF)atm = (NLF)TOA – (NLF)s
Surface Albedo (dimensionless) From Surface all-sky upward SW flux, all(USF)s and Surface all-sky downward SW flux , all(DSF)s as:

Surface Albedo = all(USF)s / all(DSF)s
SW cloud radiative forcing, (SWCRF), at the surface [W/m2] From all-sky surface downward flux (FALL) and clear-sky surface downward fluxes (FCLR) as:

SWCRF = FALL – FCLR
Shortwave Cloud Radiative Effect, (SWCRE) at TOA, (primarily <0, clouds reflect energy out of the atmosphere) [W/m2] From the TOA all-sky upward SW flux all(USF)toa and TOA clear-sky upward SW flux clr(USF)toa as:

SWCREtoa= clr(USF)toaall(USF)toa
Shortwave Cloud Radiative Effect, (SWCRE) at the surface, (primarily <0, clouds prevent energy from reaching surface) [W/m2] From Surface All Sky Downward Shortwave Flux all(DSF)s and Surface clear-sky Downward Shortwave Flux clr(USF)s as:

SWCREs= all(DSF)sclear(DSF)s
  • TOA insolation
  • TOA all-sky upward flux
  • TOA clear-sky upward flux
  • TOA pristine-sky upward flux
  • Surface all-sky upward flux
  • Surface clear-sky upward flux
  • Surface all-sky downward flux
  • Surface clear-sky downward flux
  • Surface pristine-sky downward flux
  • Surface all-sky diffuse downward flux
  • Solar zenith angle
  • Total cloud fraction
  • Par
  • Flux fill flag
  • Longwave fluxes and associated fields

    • TOA all-sky upward flux
    • TOA clear-sky upward flux
    • TOA pristine-sky upward flux
    • Surface all-sky upward flux
    • Surface clear-sky upward flux
    • Surface all-sky downward flux
    • Surface clear-sky downward flux
    • Surface pristine-sky downward flux
    • Tropopause all-sky upward flux
    • Tropopause clear-sky upward flux
    • Tropopause pristine-sky upward flux
    • Tropopause all-sky downward flux
    • Tropopause clear-sky downward flux
    • Tropopause pristine-sky downward flux
    • 200 hPa all-sky upward flux
    • 200 hPa clear-sky upward flux
    • 200 hPa pristine-sky upward flux
    • 200 hPa all-sky downward flux
    • 200 hPa clear-sky downward flux
    • 200 hPa pristine-sky downward flux
    • 500 hPa all-sky upward flux
    • 500 hPa clear-sky upward flux
    • 500 hPa pristine-sky upward flux
    • 500 hPa all-sky downward flux
    • 500 hPa clear-sky downward flux
    • 500 hPa pristine-sky downward flux
    • Flux fill flag
    • Day/night flag (3-hourly only)

    Ancillary fields

    Fields are only available as 3-hourly.

    • Surface skin temperature
    • Temperature at 2 meters
    • Specific humidity at 2 meters
    • Total column precipitable water
    • Snow and ice land coverage percent
    • Day/Night flag (day=1, night=0)
    • Total cloud area fraction
    • Total cloud top pressure
    • Total cloud top temperature
    • Total cloud optical Depth
    • Surface Pressure
    • Total column ozone
    • Longwave Surface Emissivity for 12 Fu-Liou bands

    Cloud fields for ice or water cloud fields for high, middle, and low levels:

    • Cloud area fraction
    • Cloud optical depth
    • Cloud particle size
    • Cloud top temperature
    • Cloud top pressure
    • Cloud base pressure
    • Cloud water or ice content
    • Cloud thickness
    • Fill method flag for cloud data

    Derivable fields

    While not directly offered in the data files, the following can be derived from the available fields:

    Parameter Procedure
    Net Longwave Flux Radiation at Earth’s Surface, (NLF)s [W/m2] From the downward LW flux (DLF) and upward LW flux (ULF) as:

    (NLF)s = (DLF)s – (ULF)s
    Net fluxes can be computed for the clear-sky and all-sky conditions.
    Longwave Cloud Radiative Effect, (LWCRE) at the surface, (>0, energy to the surface increased by clouds) [W/m2] From the Surface all-sky downward LW flux all(DLF)s and Surface clear-sky downward flux LW Flux clr(DLF)s as:

    LWCREs= all(DLF)sclr(DLF)s
    Longwave Cloud Radiative Effect, (LWCRE) at the TOA, (primarily >0, clouds remit at colder temperatures, energy stays in atmosphere) [W/m2] From the TOA all-sky upward LW flux all(ULF)toa and TOA clear-sky upward LW flux clr(ULF)toa as:

    LWCREtoa= clr(ULF)toaall(ULF)toa
    Net Longwave Flux of the Atmosphere, (NLF)atm, [W/m2] From the Net Longwave Flux at TOA (NLF)TOA and the Net Longwave Flux at surface (NLF)s as:

    (NLF)atm = (NLF)TOA – (NLF)s
    Surface Albedo (dimensionless) From Surface all-sky upward SW flux, all(USF)s and Surface all-sky downward SW flux , all(DSF)s as:

    Surface Albedo = all(USF)s / all(DSF)s
    SW cloud radiative forcing, (SWCRF), at the surface [W/m2] From all-sky surface downward flux (FALL) and clear-sky surface downward fluxes (FCLR) as:

    SWCRF = FALL – FCLR
    Shortwave Cloud Radiative Effect, (SWCRE) at TOA, (primarily <0, clouds reflect energy out of the atmosphere) [W/m2] From the TOA all-sky upward SW flux all(USF)toa and TOA clear-sky upward SW flux clr(USF)toa as:

    SWCREtoa= clr(USF)toaall(USF)toa
    Shortwave Cloud Radiative Effect, (SWCRE) at the surface, (primarily <0, clouds prevent energy from reaching surface) [W/m2] From Surface All Sky Downward Shortwave Flux all(DSF)s and Surface clear-sky Downward Shortwave Flux clr(USF)s as:

    SWCREs= all(DSF)sclear(DSF)s
    • CAPABLE/CRAVE Full Site Photo from left to right site enclosures: 1196A NASA LaRC, MPLnet, Virginia DEQ
      CAPABLE/CRAVE Full Site Photo from left to right site enclosures: 1196A NASA LaRC, MPLnet, Virginia DEQ

    • NASA LaRC NAST-I and HU ASSIST side-by-side for intercomparison
      NASA LaRC NAST-I and HU ASSIST side-by-side for intercomparison

    • Virginia DEQ, NASA and Penn State-NATIVE Enclosures (from right to left)
      Virginia DEQ, NASA and Penn State-NATIVE Enclosures (from right to left)

    • Ozone-sonde away.
      Ozone-sonde away.
    • About to lift.
      About to lift.
    PurpleAir PA-II-SD Air Quality Sensor
    Laser Particle Counters
    Type (2) PMS5003
    Range of measurement 0.3, 0.5, 1.0, 2.5, 5.0, & 10 μm
    Counting efficiency 50% at 0.3μm & 98% at ≥0.5μm
    Effective range
    (PM2.5 standard)*
    0 to 500 μg/m³
    Maximum range (PM2.5 standard)* ≥1000 μg/m³
    Maximum consistency error (PM2.5 standard) ±10% at 100 to 500μg/m³ & ±10μg/m³ at 0 to 100μg/m³
    Standard Volume 0.1 Litre
    Single response time ≤1 second
    Total response time ≤10 seconds
    Pressure, Temperature, & Humidity Sensor
    Type BME280
    Temperature range -40°F to 185°F (-40°C to 85°C)
    Pressure range 300 to 1100 hPa
    Humidity Response time (τ63%): 1 s
    Accuracy tolerance: ±3% RH
    Hysteresis: ≤2% RH


    Pandora capabilities

    Instrument

    Response

    Parameter

    Precision

    Uncertainty

    Range

    Resolution

    Pandora

    ~2min

    Total Column O3, NO2, HCHO, SO2, H2O, BrO

    0.01 DU

    0.1 DU

     

     

    Virginia Department of Environment Quality in-situ instrumentation

    Instrument

    Response

    Parameter

    Precision

    Uncertainty

    Thermo Scientific 42C (Molybdenum converter)
    (VADEQ)

    60 s

    NO and NOx

    50 pptv

    3%

    Teledyne API 200EU w/ photolytic converter
    (EPA) PI-Szykman

    20 s

    NO2

    50 pptv

     

    Thermo Scientific 49C (VADEQ)

    20 s

    O3

    1 ppbv

    4%

    Thermo Scientific 48i (VADEQ)

    60 s

    CO

    40 ppbv

    5%

    Thermo Scientific 43i (VADEQ)

    80 s

    SO2

    0.2 ppbv

    5%

    Thermo Scientific 1400AB TEOM (VADEQ)

    600 s

    PM2.5 (continuous)

    µg/m3

    1 3%

    Thermo Scientific Partisol Plus 2025 (VADEQ)

    24 hr

    PM2.5 (filter-based FRM)- 1/3 days

     

     

    BSRN-LRC-49
    Large area view.
    Latitude: 37.1038
    Longitude: -76.3872
    Elevation: 3 m Above sea level
    Scenes: urban, marsh, bay, river and farm.

    Legend

    • The inner red circle is a 20km CERES foot print centered on the BSRN-LRC site.
    • The pink circle represents a possible tangential 20km foot print.
    • The middle red circle represents the area in which a 20km foot print could fall and still see the site.
    • Yellow is a sample 40 deg off nadir foot print.
    • The outer red circle is the region which would be seen by a possible 40 deg off nadir foot print.
    The BSRN-LRC sun tracker at the NASA Langley Research Center on a snowy day (02/20/2015) The BSRN-LRC sun tracker at the NASA Langley Research Center on a snowy day (02/20/2015)
    CAPABLE-BSRN Google Site Location Image

    Team Satellite Sensor G/L Dates Number of obs Phase angle range (°)
    CMA FY-3C MERSI LEO 2013-2014 9 [43 57]
    CMA FY-2D VISSR GEO 2007-2014
    CMA FY-2E VISSR GEO 2010-2014
    CMA FY-2F VISSR GEO 2012-2014
    JMA MTSAT-2 IMAGER GEO 2010-2013 62 [-138,147]
    JMA GMS5 VISSR GEO 1995-2003 50 [-94,96]
    JMA Himawari-8 AHI GEO 2014- -
    EUMETSAT MSG1 SEVIRI GEO 2003-2014 380/43 [-150,152]
    EUMETSAT MSG2 SEVIRI GEO 2006-2014 312/54 [-147,150]
    EUMETSAT MSG3 SEVIRI GEO 2013-2014 45/7 [-144,143]
    EUMETSAT MET7 MVIRI GEO 1998-2014 128 [-147,144]
    CNES Pleiades-1A PHR LEO 2012 10 [+/-40]
    CNES Pleiades-1B PHR LEO 2013-2014 10 [+/-40]
    NASA-MODIS Terra MODIS LEO 2000-2014 136 [54,56]
    NASA-MODIS Aqua MODIS LEO 2002-2014 117 [-54,-56]
    NASA-VIIRS NPP VIIRS LEO 2012-2014 20 [50,52]
    NASA-OBPG SeaStar SeaWiFS LEO 1997-2010 204 (<10, [27-66])
    NASA/USGS Landsat-8 OLI LEO 2013-2014 3 [-7]
    NASA OCO-2 OCO LEO 2014
    NOAA-STAR NPP VIIRS LEO 2011-2014 19 [-52,-50]
    NOAA GOES-10 IMAGER GEO 1998-2006 33 [-66, 81]
    NOAA GOES-11 IMAGER GEO 2006-2007 10 [-62, 57]
    NOAA GOES-12 IMAGER GEO 2003-2010 49 [-83, 66]
    NOAA GOES-13 IMAGER GEO 2006 11
    NOAA GOES-15 IMAGER GEO 2012-2013 28 [-52, 69]
    VITO Proba-V VGT-P LEO 2013-2014 25 [-7]
    KMA COMS MI GEO 2010-2014 60
    AIST Terra ASTER LEO 1999-2014 1 -27.7
    ISRO OceanSat2 OCM-2 LEO 2009-2014 2
    ISRO INSAT-3D IMAGER GEO 2013-2014 2

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    The newly available hourly data will provide users the ARD needed to model the energy performance of building systems, providing information directly amenable to decision support tools introducing the industry standard EPW (EnergyPlus Weather file). One of POWER’s partners, Natural Resource Canada’s RETScreen™, will be simultaneously releasing a new version of its software, which will have integrated POWER hourly and daily ARD products. For our agroclimatology users, the ICASA (International Consortium for Agricultural Systems Applications standards) format for the crop modelers has been modernized.

    POWER is releasing new user-defined analytic capabilities, including custom climatologies and climatological-based reports for parameter anomalies, ASHRAE® compatible climate design condition statistics, and building climate zones. The ARD and climate analytics will be readily accessible through POWER's integrated services suite, including the Data Access Viewer (DAV). The DAV has been improved to incorporate updated parameter groupings, new analytical capabilities, and the new data formats. Updated methodology documentation and usage tutorials, as well as application developer specific pages, allow users to access to POWER Data efficiently.

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