V7 MOPITT Level 2 Parameter Table
DIMENSIONS
| 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/uncertainty, first element is the parameter and second element is variability/uncertainty, unless otherwise specified. | 2 |
| nPrs | Number of pressure levels | 9 |
| nPrs2 | Number of pressure levels, including the surface | 10 |
| nPix | The number of pixels | 4 |
GEOLOCATION FIELDS (’HDFEOS/SWATHS/MOP02/Geolocation Fields/…’)
| Field Name | Definition | Dimension | Units | Data Type* |
|---|---|---|---|---|
| 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 |
*F = Floating Point I = Integer
RETRIEVED CO (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| RetrrievedCOTotalColumn | CO Total Column | nTwo,nTime | mol/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 |
A PRIORI FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| APrioriCOMixingRatioProfile | Temporally and geographically variable a priori for 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 for 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 for total column CO based on a climatology for 2000-2009 simulated with the CAM-Chem model | nTwo,nTime | ppbv | F |
AVERAGING KERNEL FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
These quantities are unitless
| Field Name | Definition | Dimension | Data Type |
|---|---|---|---|
| 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 |
| RetrievalAveragingKernelMatrix | For each retrieval, a floating point array (10 x 10) containing the matrix describing the sensitivity of the retrieved CO profile to the true CO profile. Dimensions of Retrieval Averaging Kernel Matrix are ordered (nrow, ncolumn, ntime) | nPrs2,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. | Prs2,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 independent of assumed pressure level. | nPrs2,nTime | F |
CLOUD FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
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 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 7 - 10: reserved for cloud cleared pixels 11 = MOPITT only, cloudy (when MODIS data missing) 12 = First 2 stares in a packet discarded (obsolete for V3) 13 = MOPITT and MODIS cloud mask agree on cloudy 14 = MOPITT clear, MODIS cloudy and failed low cloud tests 15 = MODIS cloud mask only, cloudy over polar regions |
nTime | I |
| MODISCloudDiagnostics | (1) Number of "determined" MODIS pixels (2) Fraction of cloudy MODIS pixels (3) Fraction of clear MODIS pixels (4) Average value of "sun glint" MODIS flag (5) Average value of "snow/ice background" MODIS flag (6) Average value of "non-cloud obstruction" MODIS flag (7) Average value of "IR threshold test" MODIS flag (8) Average value of "IR temperature difference tests" MODIS flag (9) Average value of "visible reflectance test" MODIS flag (10) Fraction of "determined" MODIS pixels |
10,nTime | F |
SURFACE PROPERTY FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| APrioriSurfaceEmissivity | First guess of surface emissivity from static map | nTwo,nTime | F | |
| APrioriSurfaceTemperature | First guess of 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 | I | |
| SurfacePressure | Surface pressure from MERRA2 analysis | nTime | hPa | F |
| RetrievedSurfaceEmissivity | Surface emissivity from the retrieval | nTwo, nTime | F | |
| RetrievedSurfaceTemperature | Surface temperature from the retrieval | nTwo,nTime | K | F |
RADIANCE FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
| 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 | F | |
| Level1RadiancesandErrors | First index of Level 1 Radiances and Errors corresponds to radiances/uncertainties; second index corresponds to channel (in sequence 7A, 3A, 1A, 5A, 7D, 3D, 1D, 5D, 2A, 6A, 2D, 6D). | nTwo,12,nTime | W/m2Sr | F |
RETRIEVAL QUALITY FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
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 uncertainty due to uncertainties in the measured radiances (including instrument '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 iterations before the forward model converged on a retrieval | nTime | I |
| SignalChi2 | A measure of the retrieval's goodness of fit. | nTime | F |
| SmoothingErrorCovarianceMatrix | Smoothing error represents the retrieval uncertainty due to the influence of a priori and the features of the weighting functions. | nPrs2,nPrs2,nTime | F |
| RetrievedCOTotalColumnDiagnostics | This two-element vector contains both the estimated smoothing error and measurement error contributions to the total retrieval error (in that order). Smoothing error represents the uncertainty in the retrieved total column due to the departure of the actual total column averaging kernel from the ideal total column averaging kernel. Measurement error describes the uncertainty due to errors in the measured radiances. | nTwo,nTime | F |
ATMOSPHERIC AND OBSERVATIONAL FIELDS (’HDFEOS/SWATHS/MOP02/Data Fields/…’)
| Field Name | Definition | Dimension | Units | Data Type |
|---|---|---|---|---|
| PressureGrid | 900hPa, 800hPa, 700hPa, 600hPa,500hPa, 400hPa, 300hPa, 200hPa, 100hP | nPrs | hPa | F |
| SolarZenithAngle | Angle of solar incidence on the pixel | nTime | deg | F |
| SatelliteZenithAngle | Viewing angle of the satellite - nadir is 0 | 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 |
I DryAirColumnDry-air atmospheric column to facilitate the computation of the equivalent mixing ratio of CO averaged over the atmospheric columnnTimemol/cm2F WaterVaporColumnMoist-air atmospheric column to facilitate the computation of the equivalent mixing ratio of CO averaged over the atmospheric columnnTimemol/cm2F
NOTES: Fill Values are -9999