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| Univ of Toronto | Canadian Space Agency (CSA) | NASA | NSF - NCAR |
| Dimension Name | Definition | Size |
|---|---|---|
| nTime | Number of retrievals | Varies with each granule |
| nChan | Number of channels of the instrument | 8 |
| nTwo | For data fields which include associated variability (or uncertainty), first element is the parameter and second element is variability/uncertainty, unless otherwise specified. | 2 |
| nPrs | Number of fixed pressure levels | 9 |
| nPrs2 | Number of pressure levels, including the surface | 10 |
| nPix | The number of pixels (i.e., number of detector elements) | 4 |
| Field Name | Definition | Dimension | Units | Data Type F = Floating Point I = Integer |
|---|---|---|---|---|
| SecondsinDay | Time of the measurement in seconds from the beginning of the day. | nTime | s | F |
| Latitude | Geolocation of the pixel | nTime | deg | F |
| Longitude | Geolocation of the pixel | nTime | deg | F |
| Pressure | Pressure Levels | nPrs | hPa | F |
| Pressure2 | Pressure Levels including the surface | nPrs2 | hPa | F |
| Time | TAI Time of the observation | nTime | s | F |
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| RetrievedCOTotalColumn | CO Total Column | nTwo, nTime | molecules/cm2 | F |
| RetrievedCOLowerTropColumn | CO Lower Troposphere column (surface to 500 hPa), uncertainty | nTwo, nTime | molecules/cm2 | F |
| RetrievedCOMixingRatioProfile | CO Mixing Ratio for the layer above each pressure level | nTwo, nPrs,nTime | ppbv | F |
| RetrievedCOSurfaceMixingRatio | CO Mixing Ratio at the surface | nTwo, nTime | ppbv | F |
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| APrioriCOMixingRatioProfile | Temporally and geographically variable a priori CO profile based on a climatology for 2000-2009 simulated with the CAM-Chem model | nTwo, nPrs, nTime | ppbv | F |
| APrioriCOSurfaceMixingRatio | Temporally and geographically variable a priori surface CO based on a climatology for 2000-2009 simulated with the CAM-Chem model | nTwo, nTime | ppbv | F |
| APrioriCOTotalColumn | Temporally and geographically variable a priori total column CO based on a climatology for 2000-2009 simulated with the CAM-Chem model | nTwo, nTime | molecules/cm2 | F |
| APrioriCOLowerTropColumn | Temporally and geographically variable a priori Lower Troposphere (surface to 500 hPa) CO column, uncertainty, based on a climatology for 2000-2024 simulated with the CAM-Chem model | nTwo, nTime | molecules/cm2 | F |
These quantities are unitless
| Field Name | Definition | Dimension | Data Type |
|---|---|---|---|
| RetrievalAveragingKernelMatrix | For each retrieval, a floating point array (10 x 10) containing the matrix describing the sensitivity of the retrieved CO log(VMR) profile to the true CO log(VMR) profile. Dimensions of Retrieval Averaging Kernel Matrix are ordered (nrow, ncolumn, ntime) | nPrs2, nPrs2, nTime | F |
| AveragingKernelRowSums | This diagnostic provides a single scalar value for each row of the averaging kernel matrix equal to the sum of the elements in that row. Small row-sum values indicate retrieval levels heavily weighted by the a priori while values approaching unity indicate levels with relatively weak sensitivity to the a priori. | nPrs2, nTime | F |
| TotalColumnAveragingKernel | This diagnostic allows users to properly compare MOPITT total column retrievals with total columns derived from in-situ profiles or model simulations. | nPrs2, nTime | F |
| TotalColumnAveragingKernelDimless | This diagnostic allows users to properly compare MOPITT total column retrievals with total columns derived from in-situ profiles or model simulations based on partial columns instead of log(VMR). | nPrs2, nTime | F |
| LTColumnAveragingKernelDimless | This diagnostic allows users to properly compare MOPITT Lower Troposphere (surface to 500 hPa)column retrievals with surface to 500 hPa columns derived from in-situ profiles or model simulations based on partial columns instead of log(VMR). | nPrs2, nTime | F |
These quantities are unitless
| Field Name | Definition | Dimension | Data Type |
|---|---|---|---|
| CloudDescription |
0 = clear, only MOPITT thermal and cloudtop used 1 = clear, only MOPITT thermal used 2 = MOPITT and MODIS cloud mask agree on clear 3 = MODIS cloud mask only clear (when MOPITT determines cloudy) 4 = MOPITT overriding MODIS cloud mask over low clouds (MODIS test flags used) 5 = MODIS cloud mask only, clear over polar regions and daytime 6 = Nighttime ocean scenes where the MODIS cloud mask-based test finds that the area was cloudy but MOPITT's thermal-channel radiances finds that the area was clear | nTime | I |
| MODISCloudDiagnostics |
(1) Number of “determined” MODIS pixels (2) Percentage of cloudy MODIS pixels (3) Percentage of clear MODIS pixels, test 1 (4) Percentage of clear MODIS pixels, test 2 (5) Percentage of clear MODIS pixels, test 3 (6) Average value of “sun glint” MODIS flag (7) Average value of “snow/ice background” MODIS flag (8) Average value of “non-cloud obstruction” MODIS flag (9) Average value of “IR threshold test” MODIS flag (10) Average value of “IR temperature difference tests” MODIS flag (11) Average value of “visible reflectance test” MODIS flag (12) Fraction of “determined” MODIS pixels | 12, nTime | F |
| MOPCldRadRatio | Ratio of observed Channel 7 Average radiance and corresponding model-calculated value (used for cloud detection) | nTime | F |
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| APrioriSurfaceEmissivity | A priori surface emissivity from static map | nTwo, nTime | unitless | F |
| APrioriSurfaceTemperature | A priori surface temperature from MERRA2 analysis | nTwo, nTime | K | F |
| DEMAltitude | Digital Elevation Model surface height | nTime | m | F |
| SurfaceIndex | 0 = water 1 = land 2 = mixed (coastline) | nTime | unitless | I |
| SurfacePressure | Surface pressure from MERRA2 analysis | nTime | hPa | F |
| RetrievedSurfaceEmissivity | Surface emissivity from the retrieval | nTwo, nTime | unitless | F |
| RetrievedSurfaceTemperature | Surface temperature from the retrieval | nTwo,nTime | K | F |
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| DailyGainDev | This diagnostic provides the standard deviation of the gain values used to calibrate the radiances for a particular channel and pixel on one day. In this case, nTwo is the Average and Difference signal gains. | nTwo, nChan, nPix | unitless | F |
| Level1RadiancesandErrors | First dimension corresponds to radiances/uncertainties; second dimension corresponds to channel (in sequence 7A, 3A, 1A, 5A, 7D, 3D, 1D, 5D, 2A, 6A, 2D, 6D). | nTwo, 12, nTime | W/m2Sr | F |
| L2RadianceCorrectionFactor | Time- and water vapor dependent radiance correction factors applied to each radiance (same sequence as Level1RadiancesandErrors). | 12, nTime | unitless | F |
These quantities are unitless
| Field Name | Definition | Dimension | Data Type |
|---|---|---|---|
| DegreesofFreedomforSignal | For each retrieval, a floating point value describing the number of pieces of independent information in the retrieval, equal to the trace of the averaging kernel matrix. | nTime | F |
| MeasurementErrorCovarianceMatrix | Measurement error represents the retrieval log(VMR) uncertainty due to uncertainties in the measured radiances (including instrumental and geophysical 'noise'). | nPrs2, nPrs2, nTime | F |
| RetrievalAnomalyDiagnostic | These flags are set to true when particular anomalous conditions are observed, suggesting that the retrievals should either be ignored or used cautiously. The first four flags (i.e., elements 1-4 of the Retrieval Anomaly Diagnostic array) are set to true (i.e., a value of 1) when one of the thermal channel weighting functions exhibits a sign change vertically. Elements 1-4 correspond respectively to the 5A, 5D, 7A, and 7D weighing functions. The fifth flag of the Retrieval Anomaly Diagnostic array is set to true when the retrieval averaging kernel matrix includes at least one negative element on the matrix diagonal. | 5,nTime | I |
| RetrievalErrorCovarianceMatrix | For each retrieval, a floating point array (10 x 10) containing the a posteriori covariance matrix in base-10 log(VMR). | nPrs2, nPrs2, nTime | F |
| RetrievalIterations | The number of retrieval algorithm iterations needed for convergence | nTime | I |
| SignalChi2 | A measure of the retrieval's goodness of fit. | nTime | F |
| SmoothingErrorCovarianceMatrix | Smoothing error represents the retrieval log(VMR) uncertainty due to the influence of the a priori and weighting functions. | nPrs2, nPrs2, nTime | F |
| RetrievedCOTotalColumnDiagnostics | This two-element vector contains both the estimated smoothing error and measurement error contributions (in that order) to the total retrieval error for CO total column. Smoothing error represents the uncertainty in the retrieved total column due to to the influence of the a priori and weighting functions.Measurement error describes the uncertainty due to random errors in the measured radiances. | nTwo, nTime | F |
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| PressureGrid | Fixed pressure levels (i.e., 900, 800, 700, 600, 500, 400, 300, 200 and 100 hPa) | nPrs | hPa | F |
| SolarZenithAngle | Solar zenith angle | nTime | deg | F |
| SatelliteZenithAngle | Viewing angle of the satellite | nTime | deg | F |
| SwathIndex | For each retrieval, a three element integer vector containing the unique 'pixel' (varies from 1 to 4), 'stare' (varies from 1 to 29), and 'track' indices. 29 stares (equivalent to the mirror pivoting out and back) define one track. | 3, nTime | unitless | I |
| DryAirColumn | Dry-air atmospheric column to facilitate the computation of the equivalent mixing ratio of CO averaged over the atmospheric column | nTime | molecules/cm2 | F |
| WaterVaporColumn | Moist-air atmospheric column to facilitate the computation of the equivalent mixing ratio of CO averaged over the atmospheric column | nTime | molecules/cm2 | F |
NOTES: Fill Values are -9999