Shortname: OMAERUVd Longname: OMI/Aura Near UV Aerosol Optical Depth and Single Scattering Albedo Daily L3 Global 1x1 deg Lat/Lon Grid PFS Version: 1.6.1 Date: 2017 May 19 Author(s): Peter Leonard (ADNET) PGE Version: 1.6.1 Lead Algorithm Scientist: Omar Torres (NASA/GSFC) Lead Algorithm Developer: Peter Leonard (ADNET) Lead PGE Developer: Peter Leonard (ADNET) PGE Developer(s): Peter Leonard (ADNET) Description: > This document specifies the format of the Ozone Monitoring Instrument (OMI) OMAERUVd product, which is the daily Level 3 (L3) gridded data product that corresponds to the OMAERUV product. The latter is the primary aerosol orbital Level 2 (L2) swath data product of the U.S. OMI Science Team (Reference 1). The "d" at the end of "OMAERUVd" represents "daily". The adopted L3 grid is a 1.0-degree by 1.0-degree grid in longitude and latitude. The dimensions of the grid are 360 by 180. The grid cell at coordinates (1, 1) is centered at (longitude = -179.5 , latitude = -89.5), and the grid cell at coordinates (360, 180) is centered at (longitude = 179.5 , latitude = 89.5). The center of the grid is located at (longitude = 0.0 , latitude = 0.0), and corresponds to the corners of four grid cells. The adopted L3 grid is consistent with the document entitled "Definition of OMI Grids for Level 3 and Level 4 Data Products" by J.P. Veefkind et al. (Reference 2). The values in the OMAERUVd data product file for each L3 grid cell are weighted averages of the values for all of the OMI L2 observations that overlap with the L3 grid cell. The weight for each L2 observation is the fractional area of overlap of the OMPIXCOR FoV75 ground pixel with the L3 grid cell. The L3 product currently excludes L2 data collected in spatial and spectral zoom modes. The L3 product is stored as one HDF-EOS 5 grid file, and has a size of 0.2 MB. The format of the L3 product files is consistent with the document entitled "A File Format for Satellite Atmospheric Chemistry Data" by C. Craig et al. (Reference 3). Global Metadata: - Metadata Name: EndUTC Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: PGE Description: > UTC at the end of the L3 granule in "YYYY-MM-DDT23:59:59.999999Z" format. - Metadata Name: GranuleDay Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 1 Maximum Value: 31 Data Source: PGE Description: The day of the month at the start of the L3 granule. - Metadata Name: GranuleDayOfYear Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 1 Maximum Value: 366 Data Source: PGE Description: The day of the year at the start of the L3 granule. - Metadata Name: GranuleMonth Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 1 Maximum Value: 12 Data Source: PGE Description: The month of the year at the start of the L3 granule. - Metadata Name: GranuleYear Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 2000 Maximum Value: 2099 Data Source: PGE Description: The (four-digit) year at the start of the L3 granule. - Metadata Name: HDFEOSVersion Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: HE Description: > The version of HDF-EOS 5 used in production. Example is "HDFEOS_5.1.9". - Metadata Name: InstrumentName Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: OMI Data Source: PGE Description: Actual is "OMI" (see Section 6.1 of Reference 3). - Metadata Name: OrbitNumber Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1,60 Minimum Value: 1 Maximum Value: 999999 Data Source: L2G Description: The OMI orbit number for each L2 input granule. - Metadata Name: OrbitPeriod Mandatory: T Data Type: HE5T_NATIVE_DOUBLE Number of Values: 1,60 Minimum Value: 5000.0 Maximum Value: 7000.0 Data Source: L2G Description: The Aura orbital period for each L2 input granule. - Metadata Name: Period Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: Daily,Weekly,Monthly Data Source: PGE Description: The duration of the L3 granule. Actual is "Daily". - Metadata Name: PGEVersion Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: PCF Description: Example is "1.3.0" (see Appendix K of Reference 4). - Metadata Name: ProcessLevel Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: 3 Data Source: PGE Description: Actual is "3". - Metadata Name: StartUTC Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: PGE Description: > UTC at the start of the L3 granule in "YYYY-MM-DDT00:00:00.000000Z" format. - Metadata Name: TAI93At0zOfGranule Mandatory: T Data Type: HE5T_NATIVE_DOUBLE Number of Values: 1 Minimum Value: 0.0 Maximum Value: 1.0e+30 Data Source: PGE Description: > The TAI93 time at 0z of the L3 granule (see Section 6.1 of Reference 3). Grid Metadata: - Metadata Name: GCTPProjectionCode Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 0 Maximum Value: 99 Data Source: PGE Description: > The GCTP projection code of the L3 grid. Actual is 0, which corresponds to the geographic projection. - Metadata Name: GridName Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: Aerosol NearUV Grid Data Source: PGE Description: Actual is "Aerosol NearUV Grid". - Metadata Name: GridOrigin Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: Center Data Source: PGE Description: > The origin of the L3 grid. Actual is "Center" (see Section 6.2 of Reference 3). - Metadata Name: GridSpacing Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: PGE Description: > Spacing of L3 grid (in degrees). Actual is "(1.0,1.0)". - Metadata Name: GridSpacingUnit Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: deg Data Source: PGE Description: > Unit for GridSpacing. Actual is "deg". - Metadata Name: GridSpan Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Data Source: PGE Description: > Span of L3 grid (in degrees). Actual is "(-180,180,-90,90)". - Metadata Name: GridSpanUnit Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: deg Data Source: PGE Description: > Unit for GridSpan. Actual is "deg". - Metadata Name: NumberOfLatitudesInGrid Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 1 Maximum Value: 180 Data Source: PGE Description: The number of latitude bins in the L3 grid. - Metadata Name: NumberOfLongitudesInGrid Mandatory: T Data Type: HE5T_NATIVE_INT Number of Values: 1 Minimum Value: 1 Maximum Value: 360 Data Source: PGE Description: The number of longitude bins in the L3 grid. - Metadata Name: Projection Mandatory: T Data Type: HE5T_NATIVE_CHAR Number of Values: 1 Valids: Geographic Data Source: PGE Description: > The map projection of the L3 grid. Actual is "Geographic" (see Section 6.2 of Reference 3). Grid Dimensions: - Dimension Name: XDim Data Type: HE5T_NATIVE_INT Dimension Type: FIXED Number of Values: 1 Minimum Value: 1 Maximum Value: 360 Data Source: PGE Description: > The longitudes dimension of the L3 grid. There are currently 360 1.0-degree-wide bins between longitudes -180.0 and 180.0 degrees. - Dimension Name: YDim Data Type: HE5T_NATIVE_INT Dimension Type: FIXED Number of Values: 1 Minimum Value: 1 Maximum Value: 180 Data Source: PGE Description: > The latitudes dimension of the L3 grid. There are currently 180 1.0-degree-wide bins between latitudes -90.0 and 90.0 degrees. Geolocation Fields: > None. Data Fields: - Field Name: CloudFraction Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Cloud Fraction Unique Field Definition: OMI-Specific Description: > The average cloud fraction in each L3 grid cell. - Field Name: CloudOpticalDepth Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 100.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Cloud Optical Depth Unique Field Definition: OMI-Specific Description: > The average cloud optical depth in each L3 grid cell. - Field Name: FinalAerosolAbsOpticalDepth354 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 10.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 354 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol absorption optical depth at 354 nm in each L3 grid cell. - Field Name: FinalAerosolAbsOpticalDepth388 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 10.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 388 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol absorption optical depth at 388 nm in each L3 grid cell. - Field Name: FinalAerosolAbsOpticalDepth500 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 10.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 500 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol absorption optical depth at 500 nm in each L3 grid cell. - Field Name: FinalAerosolOpticalDepth354 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 100.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 354 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol optical depth at 354 nm in each L3 grid cell. - Field Name: FinalAerosolOpticalDepth388 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 100.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 388 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol optical depth at 388 nm in each L3 grid cell. - Field Name: FinalAerosolOpticalDepth500 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 100.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Absorption Optical Depth at 500 nm Unique Field Definition: OMI-Specific Description: > The average final aerosol optical depth at 500 nm in each L3 grid cell. - Field Name: FinalAerosolSingleScattAlb543 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Single Scattering Albedo at 354 nm Unique Field Definition: OMI-Specific Description: > The average final single scattering albedo at 354 nm in each L3 grid cell. - Field Name: FinalAerosolSingleScattAlb388 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Single Scattering Albedo at 388 nm Unique Field Definition: OMI-Specific Description: > The average final single scattering albedo at 388 nm in each L3 grid cell. - Field Name: FinalAerosolSingleScattAlb500 Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: 0.0 Maximum Value: 1.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: Final Aerosol Single Scattering Albedo at 500 nm Unique Field Definition: OMI-Specific Description: > The average final single scattering albedo at 500 nm in each L3 grid cell. - Field Name: UVAerosolIndex Data Type: HE5T_NATIVE_FLOAT Dimensions: YDim,XDim Minimum Value: -10.0 Maximum Value: 50.0 Missing Value: -1.2676506e+30 Offset: 0.0 Scale Factor: 1.0 Units: NoUnits Data Source: L2G Title: UV Aerosol Index Unique Field Definition: OMI-Specific Description: > The average UV aerosol index in each L3 grid cell. Core Metadata: > None. Product Specific Attributes: > None. Archived Metadata: > None. References: > 1. "OMAERUV README File" (2011 October 20) (http://disc.sci.gsfc.nasa.gov/Aura/data-holdings/OMI/omaeruv_v003.shtml) 2. "Definition of OMI Grids for Level 3 and Level 4 Data Products" (OMI-Grids_L3L4, SD-OMIE-KNMI-443, 25 January 2005) 3. "A File Format for Satellite Atmospheric Chemistry Data" (OMI-AURA-DATA-GUIDE, Version 1.7, 12 May 2008) 4. "OMI Science Software Delivery Guide for Version 0.9" (OMI-SSDG-0.9.10, Version 0.9.10, 22 June 2005)