Shortname: OMSO2

Longname: OMI/Aura Sulphur Dioxide (SO2) Total Column 1-Orbit L2

Swath 13x24 km

PFS Version: 1.0.2

Date: 25 January 2008

Author(s): Kai Yang, Nick Krotkov, Simon Carn, Arlin J. Krueger

PGE Version: 1.1.0 and later

Lead Algorithm Scientist: Nick Krotkov, Arlin J. Krueger

Lead Algorithm Developer: Kai Yang

Lead PGE Developer: Kai Yang

PGE Developer(s): Simon Carn

Description: >

This document specifies the product format for the Version 1.1.0 and

subsequent delivery of the OMSO2 L2 PGE, which uses OMTO3 L2 measurements

to estimate the total column amount of SO2. The product is stored as

one HDF-EOS 5 swath file for each granule (i.e., one orbit) of OMTO3

L2 data, and has a size range of 5 to 50 Mb.

Global Metadata:

- Metadata Name: AuthorAffiliation

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Not applicable (free format).

Data Source: PCF

Description: Actual is "JCET".

- Metadata Name: AuthorName

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Not applicable (free format).

Data Source: PCF

Description: >

Actual is "N. Krotkov, K. Yang, S. Carn, A.J. Krueger".

- Metadata Name: GranuleDay

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Range or Valids: Range is 1 to 31.

Data Source: PGE

Description: >

The day of the month at the start of the granule.

- Metadata Name: GranuleMonth

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Range or Valids: Range is 1 to 12.

Data Source: PGE

Description: The month at the start of the granule.

- Metadata Name: GranuleYear

Mandatory: T

Data Type: HE5T_NATIVE_INT

Number of Values: 1

Range or Valids: Range is 2000 to 2099.

Data Source: PGE

Description: >

The (four-digit) year at the start of the granule.

- Metadata Name: HDFEOSVersion

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Automatically set by HDF-EOS.

Data Source: HE

Description: Example is "HDFEOS_5.1.5".

- Metadata Name: InputVersions

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Not applicable (free format).

Data Source: PGE

Description: >

A list of every ESDT (including version) whose product was used as

input for the processing.

- Metadata Name: InstrumentName

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Valids are "HIRDLS", "MLS", "OMI" and "TES".

Data Source: PCF

Description: Actual is "OMI" (see Section 6.1 of Reference 2).

- Metadata Name: OrbitData

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Valids are "DEFINITIVE" and "PREDICTED".

Data Source: L1B

Description: >

Indicates whether orbit data used by the L1B processor is definitive

or predicted.

- Metadata Name: PGEVERSION

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Range is "0.0.0" to "9.9.99".

Data Source: PCF

Description: Actual is "0.1.0".

- Metadata Name: ProcessingCenter

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Not applicable (free format).

Data Source: PCF

Description: Example is "OMIDAPS".

- Metadata Name: ProcessingHost

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Not applicable (free format).

Data Source: PCF

Description: >

The output from executing the Unix "uname -a" command on the

processing machine.

- Metadata Name: ProcessLevel

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Valids are "1b", "2" and "3".

Data Source: PCF

Description: Actual is "2".

- Metadata Name: TAI93At0zOfGranule

Mandatory: T

Data Type: HE5T_NATIVE_DOUBLE

Number of Values: 1

Range or Valids: Range is 0.0d+00 to 1.0d+30.

Data Source: PGE

Description: >

The TAI93 time at 0z of the granule (see Section 6.1 of Reference 2).

Swath Metadata:

- Metadata Name: SwathName

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: Valid is "OMI Total Column Amount SO2".

Data Source: PGE

Description: Actual is "OMI Total Column Amount SO2".

- Metadata Name: VerticalCoordinate

Mandatory: T

Data Type: HE5T_NATIVE_CHAR

Number of Values: 1

Range or Valids: >

Valids are "Pressure", "Altitude", "Potential Temperature",

"Slant Column" and "Total Column".

Data Source: PGE

Description: >

Actual is "Total Column" (see Section 6.2 of Reference 2).

Swath Dimensions:

- Dimension Name: nTimes

Data Type: HE5T_NATIVE_INT

Dimension Type: FIXED

Number of Values: 1

Range or Valids: Range is 0 to 9999.

Data Source: L1B

Description: The number of "scan" lines in the swath.

- Dimension Name: nXtrack

Data Type: HE5T_NATIVE_INT

Dimension Type: FIXED

Number of Values: 1

Range or Valids: Range is 1 to 60.

Data Source: L1B

Description: The number of ground pixels per "scan" line.

Geolocation Fields:

- Field Name: GroundPixelQualityFlags

Data Type: HE5T_NATIVE_UINT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 65534.

Missing Value: 65535

Offset: 0.0d0

Scale Factor: 1.0d0

Units: NoUnits

Data Source: L1B

Title: "Ground Pixel Quality Flags"

Unique Field Definition: TOMS-OMI-Shared

Description: >

Bits 0 to 3 together contain the land/water flags:

0 - shallow ocean

1 - land

2 - shallow inland water

3 - ocean coastline/lake shoreline

4 - ephemeral (intermittent) water

5 - deep inland water

6 - continental shelf ocean

7 - deep ocean

8-14 - not used

15 - error flag for land/water

Bits 4 to 6 are flags that are set to 0 for FALSE, or 1 for TRUE:

Bit 4 - sun glint possibility flag

Bit 5 - solar eclipse possibility flag

Bit 6 - geolocation error flag

Bit 7 is reserved for future use (currently set to 0).

Bits 8 to 14 together contain the snow/ice flags (based on NISE):

0 - snow-free land

1-100 - sea ice concentration (percent)

101 - permanent ice (Greenland, Antarctica)

102 - not used

103 - dry snow

104 - ocean (NISE-255)

105-123 - reserved for future use

124 - mixed pixels at coastline (NISE-252)

125 - suspect ice value (NISE-253)

126 - corners undefined (NISE-254)

127 - error

Bit 15 - NISE nearest neighbor filling flag.

(See Section 6.2 of Reference 4 for more details.)

- Field Name: Latitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is -90.0 to 90.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Geodetic Latitude"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The geodetic latitude (in deg) at the center of the ground pixel.

- Field Name: Longitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is -180.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Geodetic Longitude"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The geodetic longitude (in deg) at the center of the ground pixel.

- Field Name: RelativeAzimuthAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is -180.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg(EastofNorth)

Data Source: L1B

Title: >

"Relative Azimuth Angle (sun + 180 - view)"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The relative (sun + 180 - view) azimuth angle (in deg) at the center

of the ground pixel.

- Field Name: SecondsInDay

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes

Range or Valids: Range is 0.0 to 86401.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: s

Data Source: L1B

Title: "Seconds after UTC midnight"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The time (in s) after UTC midnight at the start of the "scan".

- Field Name: SolarAzimuthAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is -180.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg(EastofNorth)

Data Source: L1B

Title: "Solar Azimuth Angle"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The solar azimuth angle (in deg) at the center of the ground pixel.

- Field Name: SolarZenithAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Solar Zenith Angle"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The solar zenith angle (in deg) at the center of the ground pixel.

- Field Name: SpacecraftAltitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes

Range or Valids: Range is 4.0E05 to 9.0E05.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: m

Data Source: L1B

Title: "Spacecraft Altitude"

Unique Field Definition: TOMS-Aura-Shared

Description: >

Height above WGS84 ellipsoid.

- Field Name: SpacecraftLatitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes

Range or Valids: Range is -90.0 to 90.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Spacecraft Latitude"

Unique Field Definition: TOMS-Aura-Shared

Description: >

Geodetic latitude above WGS84 ellipsoid.

- Field Name: SpacecraftLongitude

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes

Range or Valids: Range is -180.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Spacecraft Longitude"

Unique Field Definition: TOMS-Aura-Shared

Description: >

Geodetic longitude above WGS84 ellipsoid.

- Field Name: TerrainHeight

Data Type: HE5T_NATIVE_INT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is -100.0 to 10000.0.

Missing Value: -32767

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: m

Data Source: L1B

Title: "Terrain Height"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The terrain height (in m) at the center of the ground pixel (from

the OMI Level 1B file).

- Field Name: Time

Data Type: HE5T_NATIVE_DOUBLE

Dimensions: nTimes

Range or Valids: Range is -5.0D09 to 1.0D10.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: s

Data Source: L1B

Title: "Time at Start of Scan (TAI93)"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The TAI93 time (in s) at the start of the "scan".

- Field Name: ViewingAzimuthAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is -180.0 to 180.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg(EastofNorth)

Data Source: L1B

Title: "Viewing Azimuth Angle"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The viewing azimuth angle (in deg) at the center of the ground pixel.

- Field Name: ViewingZenithAngle

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0.0 to 70.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: deg

Data Source: L1B

Title: "Viewing Zenith Angle"

Unique Field Definition: TOMS-Aura-Shared

Description: >

The viewing zenith angle (in deg) at the center of the ground pixel.

Data Fields:

- Field Name: AlgorithmFlag_PBL

Data Type: HE5T_NATIVE_UINT8

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 16.

Missing Value: 255

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Algorithm Flag for PBL"

Unique Field Definition: OMI-Specific

Description: >

The PBL processing flag for each ground pixel, indicating the

algorithm path:

0 - skipped

1 - linear fitting, vertical column SO2, short wavelength window

2 - linear fitting, vertical column SO2, long wavelength window

Add 10 for snow/ice

- Field Name: AlgorithmFlag_TRL

Data Type: HE5T_NATIVE_UINT8

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 16.

Missing Value: 255

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Algorithm Flag for TRL"

Unique Field Definition: OMI-Specific

Description: >

The TRL processing flag for each ground pixel, indicating the

algorithm path:

0 - skipped

1 - linear fitting, vertical column SO2, short wavelength window

2 - linear fitting, vertical column SO2, long wavelength window

Add 10 for snow/ice

- Field Name: AlgorithmFlag_TRM

Data Type: HE5T_NATIVE_UINT8

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 16.

Missing Value: 255

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Algorithm Flag for TRM"

Unique Field Definition: OMI-Specific

Description: >

The TRM processing flag for each ground pixel, indicating the

algorithm path:

0 - skipped

1 - linear fitting, vertical column SO2, short wavelength window

2 - linear fitting, vertical column SO2, long wavelength window

Add 10 for snow/ice

- Field Name: AlgorithmFlag_STL

Data Type: HE5T_NATIVE_UINT8

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 16.

Missing Value: 255

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Algorithm Flag for STL"

Unique Field Definition: OMI-Specific

Description: >

The STL processing flag for each ground pixel, indicating the

algorithm path:

0 - skipped

1 - linear fitting, vertical column SO2, short wavelength window

2 - linear fitting, vertical column SO2, long wavelength window

Add 10 for snow/ice

- Field Name: ChiSquare

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 100.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Chi square of the fitting residuals"

Unique Field Definition: OMI-Specific

Description: The Chi square for STL from the linear

least square fit.

- Field Name: fc

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Minimum Value: 0.0

Maximum Value: 1.0

Missing Value: -1.2676506e+30

Offset: 0.0

Scale Factor: 1.0

Units: NoUnits

Data Source: PGE

Title: MLER Cloud Fraction

Unique Field Definition: TOMS-OMI-Shared

Description: The MLER model parameter: effective cloud

fraction.

- Field Name: RadiativeCloudFraction

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 1.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Effective Cloud Fraction"

Unique Field Definition: TOMS-OMI-Shared

Description: The effective cloud fraction.

- Field Name: CloudPressure

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is 0.0 to 1013.25

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: hPa

Data Source: PGE

Title: "Radiative Cloud Pressure"

Unique Field Definition: OMI-Specific

Description: >

The effective cloud pressure associated with the ground pixel.

- Field Name: ColumnAmountO3

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is 50.0 to 700.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "Best Total Ozone Solution"

Unique Field Definition: OMI-Specific

Description: >

The best retrieved total column O3 from OMTO3.

- Field Name: deltaO3

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -1000.0 to 1000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "adjustment to ColumnAmount O3 "

Unique Field Definition: OMI-Specific

Description: >

The ozone adjustment derived from fitting method.

- Field Name: ColumnAmountSO2_TRL

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "Vertical Column Amount SO2 (TRL)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a prscribed SO2 profile

similar to the standard ozone profile in Umkher layer 0 (roughly

between 0 and 5 KM altitude).

- Field Name: ColumnAmountSO2_TRM

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "Vertical Column Amount SO2 (TRM)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a prscribed SO2 profile

similar to the standard ozone profile in Umkher layer 1 (roughly

between 5 and 10 KM altitude).

- Field Name: ColumnAmountSO2_TRMbrd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "BRD Vertical Column Amount SO2 (TRM)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a prscribed SO2 profile

similar to the standard ozone profile in Umkher layer 1 (roughly

between 5 and 10 KM altitude).

- Field Name: ColumnAmountSO2_STL

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "Vertical Column Amount SO2 (STL)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a prscribed SO2 profile

similar to the standard ozone profile in Umkher layer 3 (roughly

between 15 and 20 KM altitude).

- Field Name: ColumnAmountSO2_STLbrd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "BRD Vertical Column Amount SO2 (STL)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a prscribed SO2 profile

similar to the standard ozone profile in Umkher layer 3 (roughly

between 15 and 20 KM altitude).

- Field Name: ColumnAmountSO2_PBL

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "Vertical Column Amount SO2 (PBL)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a boundary-layer

SO2 profile averaged from in-situ aircraft measurments over eastern

United States.

- Field Name: ColumnAmountSO2_PBLbrd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -10.0 to 2000.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: DU

Data Source: PGE

Title: "BRD Vertical Column Amount SO2 (PBL)"

Unique Field Definition: OMI-Specific

Description: >

The retrieved vertical column amount SO2 with a boundary-layer

SO2 profile averaged from in-situ aircraft measurments over eastern

United States.

- Field Name: deltaRefl

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -1.0 to 1.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: NoUnits

Data Source: PGE

Title: "adjustment to reflectivity at 331nm"

Unique Field Definition: OMI-Specific

Description: >

The reflectivity vs wavelength is described by a second order

polynomial,

R = R331 + c1*(lambda-331) + c2 *(lambda-331)**2. The deltaRefl is

the reflectivity adjustment to the zero-th order term, R331.

- Field Name: dN_dSO2_TRM

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nWavel

Range or Valids: Range is 0.0 to 10.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: 1/DU

Data Source: PGE

Title: "Umkehr Layer 1 SO2 Sensitivity Ratio, dN/dSO2"

Unique Field Definition: TOMS-OMI-Shared

Description: Umkehr Layer 1 SO2 sensitivity ratio, dN/dSO2.

- Field Name: dN_dSO2_STL

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nWavel

Range or Valids: Range is 0.0 to 10.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: 1/DU

Data Source: PGE

Title: "Umkehr Layer 3 SO2 Sensitivity Ratio, dN/dSO2"

Unique Field Definition: TOMS-OMI-Shared

Description: Umkehr Layer 3 SO2 sensitivity ratio, dN/dSO2.

- Field Name: dN_dSO2_TRL

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nWavel

Range or Valids: Range is 0.0 to 10.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: 1/DU

Data Source: PGE

Title: "Umkehr Layer 0 SO2 Sensitivity Ratio, dN/dSO2"

Unique Field Definition: TOMS-OMI-Shared

Description: Umkehr Layer 0 SO2 sensitivity ratio, dN/dSO2.

- Field Name: LayerEfficiency

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nLayers

Range or Valids: Range is 0.0 to 10.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Algorithmic Layer Efficiency"

Unique Field Definition: TOMS-OMI-Shared

Description: The algorithmic layer efficiency.

- Field Name: QualityFlags_PBL

Data Type: HE5T_NATIVE_UINT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 65534.

Missing Value: 65535

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Quality Flags for PBL"

Unique Field Definition: OMI-Specific

Description: >

Each bit correspond to a flag that is set to 0 for good value,

or 1 for bad value:

Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are

consistent, 1 for not)

Bit 1 - geometric slant O3 column >= Threshold (currently set at

1500 D.U.)

Bit 2 - UV Aerosol Index > 3

Bit 3 - Reflectivity at 331 nm > 15 %

Bit 4 to 6 together represents one number whose value ranging

from 0 to 7

- it is equal to the first 4 bits of the OMTO3 QualityFalgs.

Bit 7 - Descending

Bit 8 - reflectivity error

Bit 9 - geolocation error

Bit 10 - L1B warning, error, or missing

Bit 11 - place holder, set to zero currently

Bit 12 - place holder, set to zero currently

Bit 13 - place holder, set to zero currently

Bit 14 - place holder, set to zero currently

Bit 15 - place holder, set to zero currently

- Field Name: QualityFlags_TRL

Data Type: HE5T_NATIVE_UINT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 65534.

Missing Value: 65535

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Quality Flags for TRL"

Unique Field Definition: OMI-Specific

Description: >

Each bit correspond to a flag that is set to 0 for good value,

or 1 for bad value:

Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are

consistent, 1 for not)

Bit 1 - geometric slant O3 column >= Threshold (currently set at

1500 D.U.)

Bit 2 - UV Aerosol Index > 3

Bit 3 - Reflectivity at 331 nm > 15 %

Bit 4 to 6 together represents one number whose value ranging

from 0 to 7

- it is equal to the first 4 bits of the OMTO3 QualityFalgs.

Bit 7 - Descending

Bit 8 - reflectivity error

Bit 9 - geolocation error

Bit 10 - L1B warning, error, or missing

Bit 11 - place holder, set to zero currently

Bit 12 - place holder, set to zero currently

Bit 13 - place holder, set to zero currently

Bit 14 - place holder, set to zero currently

Bit 15 - place holder, set to zero currently

- Field Name: QualityFlags_TRM

Data Type: HE5T_NATIVE_UINT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 65534.

Missing Value: 65535

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Quality Flags for TRM"

Unique Field Definition: OMI-Specific

Description: >

Each bit correspond to a flag that is set to 0 for good value,

or 1 for bad value:

Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are

consistent, 1 for not)

Bit 1 - geometric slant O3 column >= Threshold (currently set at

1500 D.U.)

Bit 2 - UV Aerosol Index > 3

Bit 3 - Reflectivity at 331 nm > 15 %

Bit 4 to 6 together represents one number whose value ranging

from 0 to 7

- it is equal to the first 4 bits of the OMTO3 QualityFalgs.

Bit 7 - Descending

Bit 8 - reflectivity error

Bit 9 - geolocation error

Bit 10 - L1B warning, error, or missing

Bit 11 - place holder, set to zero currently

Bit 12 - place holder, set to zero currently

Bit 13 - place holder, set to zero currently

Bit 14 - place holder, set to zero currently

Bit 15 - place holder, set to zero currently

- Field Name: QualityFlags_STL

Data Type: HE5T_NATIVE_UINT16

Dimensions: nTimes,nXtrack

Range or Valids: Range is 0 to 65534.

Missing Value: 65535

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "Quality Flags for STL"

Unique Field Definition: OMI-Specific

Description: >

Each bit correspond to a flag that is set to 0 for good value,

or 1 for bad value:

Bit 0 - SO2 consistency flag (0 for SO2 from 3 pairs are

consistent, 1 for not)

Bit 1 - geometric slant O3 column >= Threshold (currently set at

1500 D.U.)

Bit 2 - UV Aerosol Index > 3

Bit 3 - Reflectivity at 331 nm > 15 %

Bit 4 to 6 together represents one number whose value ranging

from 0 to 7

- it is equal to the first 4 bits of the OMTO3 QualityFalgs.

Bit 7 - Descending

Bit 8 - reflectivity error

Bit 9 - geolocation error

Bit 10 - L1B warning, error, or missing

Bit 11 - place holder, set to zero currently

Bit 12 - place holder, set to zero currently

Bit 13 - place holder, set to zero currently

Bit 14 - place holder, set to zero currently

Bit 15 - place holder, set to zero currently

- Field Name: Rlambda1st

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -1.0 to 1.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: NoUnits

Data Source: PGE

Title: "First order term of the R-Lambda function"

Unique Field Definition: OMI-Specific

Description: >

The reflectivity vs wavelength is described by a second order

polynomial,

R = R331 + c1*(lambda-331) + c2 *(lambda-331)**2. Rlambda1st is the

first

order coefficient c1.

- Field Name: Rlambda2nd

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -1.0 to 1.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: NoUnits

Data Source: PGE

Title: "Second order term of the R-Lambda function"

Unique Field Definition: OMI-Specific

Description: >

The reflectivity vs wavelength is described by a second order

polynomial,

R = R331 + c1*(lambda-331) + c2 *(lambda-331)**2. Rlambda2nd is the

second

order coefficient c2.

- Field Name: Reflectivity331

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nXtrack,nTimes

Range or Valids: Range is -15.0 to 115.0

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d0

Scale Factor: 1.0d0

Units: percent

Data Source: PGE

Title: "Effective Surface Reflectivity at 331 nm"

Unique Field Definition: OMI-Specific

Description: >

Effective surface reflectivity of the surface at the center of

the pixel.

- Field Name: Residual

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nWavel

Range or Valids: Range is -150.0 to 150.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00

Units: NoUnits

Data Source: PGE

Title: "N-Value Residual"

Unique Field Definition: TOMS-OMI-Shared

Description: The N-value residual from OMTO3.

- Field Name: ResidualAdjustment

Data Type: HE5T_NATIVE_FLOAT

Dimensions: nTimes,nXtrack,nWavel

Range or Valids: Range is -50.0 to 50.0.

Missing Value: "-0X1P+100 (C language representation)"

Offset: 0.0d+00

Scale Factor: 1.0d+00