Dataset Information

identifier_product_doi: 10.5067/W8QGIYNKS3JC
identifier_product_doi_authority: http://dx.doi.org/
filter_function: oco2_xco2_quality_flag_b9
bc_function: oco2_bias_correct_b9
warn_level_function: oco2_warn_levels_b8
Bias_Correction_land: XCO2_Bias_Corrected = (XCO2_Raw + 0.900*(dpfrac + 0.0) + 0.0290*(co2_grad_del - 15.0) + 9.00*(DWS + 0.0) - footprint_bias)/0.99540
Bias_Correction_oceanGL: XCO2_Bias_Corrected = (XCO2_Raw + 0.245*(dp_sco2 + 0.0) - 0.0900*((co2_grad_del<(-6.)) + 6.00) - footprint_bias)/0.99530
Footprint_bias_land: Assumed footprint biases in xco2 [ppm] for footprints 1-8: -0.36, -0.15, -0.16, -0.14, 0.02, 0.33, 0.13, 0.34
Footprint_bias_oceanGL: Assumed footprint biases in xco2 [ppm] for footprints 1-8: -0.36, -0.15, -0.16, -0.14, 0.02, 0.33, 0.13, 0.34
Bias_Uncertainty: Bias correction parameter uncertainties are given in the data users guide.
Note_regarding_bias_correction: There is some uncertainty in not only the bias correction coefficients but in the chosen parameters themselves. This release bias correction may be slightly different that of previous releases, and also somewhat different from those of previous ACOS algorithm versions. This has to do with details of the particular retrieval algorithm version and is considered normal (though not ideal).
Platform: OCO-2
Sensor: OCO-2
title: ACOS L2 Lite Output
BuildId: B8.1.02
filtering_state: Filtered with oco2_lite_file_prefilter_b8a
creation_date: May 2019
contact: Chris O'Dell: odell@atmos.colostate.edu


Variables in this Dataset

xco2_apriori: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: A priori XCO2 Value
missing_value: -999999.0000
origname: xco2_apriori
fullnamepath: /xco2_apriori
file_index: Array of Bytes [sounding_id = 0..191238]
units: none
long_name: L2 File Index
missing_value: -1
comment: 1-Based Index of L2 File for each sounding
origname: file_index
fullnamepath: /file_index
pressure_levels: Array of 32 bit Reals [sounding_id = 0..191238][levels = 0..19]
units: hPa
long_name: Pressure_Levels
missing_value: -999999.0000
comment: Pressure at each level; Defined on layer boundaries. These are oriented space-to-surface, so the first element defines the TOA, the last element defines the surface.
origname: pressure_levels
fullnamepath: /pressure_levels
xco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: XCO2
missing_value: -999999.0000
comment: Column-averaged dry-air mole fraction of CO2 (includes bias correction)
origname: xco2
fullnamepath: /xco2
time: Array of 64 bit Reals [sounding_id = 0..191238]
units: seconds since 1970-01-01 00:00:00
long_name: time
missing_value: -999999.00000000000
origname: time
fullnamepath: /time
pressure_weight: Array of 32 bit Reals [sounding_id = 0..191238][levels = 0..19]
units: none
long_name: Pressure Weighting Function
missing_value: -999999.0000
comment: Pressure weighting function for each level; Defined on layer boundaries. These are oriented space-to-surface, so the first element defines the TOA, the last element defines the surface.
origname: pressure_weight
fullnamepath: /pressure_weight
Preprocessors_co2_ratio: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: CO2 Ratio
missing_value: -999999.0000
comment: Bias- and Footprint-corrected Band 3 / Band 2 Ratio of retrieved Single-band XCO2 using IMAP-DOAS algorithm
origname: co2_ratio
fullnamepath: /Preprocessors/co2_ratio
Preprocessors_max_declocking_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: max_declocking_sco2
missing_value: -999999.0000
comment: ABS(MaxDeclockingFactor_StrongCO2_Band - 1)*100
origname: max_declocking_sco2
fullnamepath: /Preprocessors/max_declocking_sco2
Preprocessors_max_declocking_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: max_declocking_o2a
missing_value: -999999.0000
comment: ABS(MaxDeclockingFactor_O2A_Band - 1)*100
origname: max_declocking_o2a
fullnamepath: /Preprocessors/max_declocking_o2a
Preprocessors_xco2_strong_idp: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: xco2_strong
missing_value: -999999.0000
comment: XCO2 from Strong CO2 Band only, IMAP-DOAS algorithm
origname: xco2_strong_idp
fullnamepath: /Preprocessors/xco2_strong_idp
Preprocessors_max_declocking_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: max_declocking_wco2
missing_value: -999999.0000
comment: ABS(MaxDeclockingFactor_WeakCO2_Band - 1)*100
origname: max_declocking_wco2
fullnamepath: /Preprocessors/max_declocking_wco2
Preprocessors_dp_abp: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: delta_surface_pressure_abp
missing_value: -999999.0000
comment: Retrieved-Prior Pressure from the fast O2A-band only preprocessor retrieval
origname: dp_abp
fullnamepath: /Preprocessors/dp_abp
Preprocessors_co2_ratio_offset_per_footprint: Array of 32 bit Reals [footprints = 0..7]
units: dimensionless
long_name: co2_ratio_offset_per_footprint
missing_value: -999999.0000
comment: Per footprint offset subtracted from co2_ratio in the L2Std files to form co2_ratio in the lite files
origname: co2_ratio_offset_per_footprint
fullnamepath: /Preprocessors/co2_ratio_offset_per_footprint
Preprocessors_h2o_ratio: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: H2O Ratio
missing_value: -999999.0000
comment: Footprint-corrected Band 3 / Band 2 Ratio of retrieved Single-band XH2O using IMAP-DOAS algorithm
origname: h2o_ratio
fullnamepath: /Preprocessors/h2o_ratio
Preprocessors_xco2_weak_idp: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: xco2_weak
missing_value: -999999.0000
comment: XCO2 from Weak CO2 Band only, IMAP-DOAS algorithm
origname: xco2_weak_idp
fullnamepath: /Preprocessors/xco2_weak_idp
Preprocessors_h2o_ratio_offset_per_footprint: Array of 32 bit Reals [footprints = 0..7]
units: dimensionless
long_name: h2o_ratio_offset_per_footprint
missing_value: -999999.0000
comment: Per footprint offset subtracted from h2o_ratio in the L2Std files to form co2_ratio in the lite files
origname: h2o_ratio_offset_per_footprint
fullnamepath: /Preprocessors/h2o_ratio_offset_per_footprint
solar_zenith_angle: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees
long_name: sounding_solar_zenith
missing_value: -999999.0000
comment: solar zenith angle at the time of the measurement
origname: solar_zenith_angle
fullnamepath: /solar_zenith_angle
longitude: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees_east
long_name: longitude
missing_value: -999999.0000
comment: center longitude of the measurement
origname: longitude
fullnamepath: /longitude
xco2_qf_bitflag: Array of 32 bit Integers [sounding_id = 0..191238]
units: none
long_name: B9 xco2_quality_flag bitflag
missing_value: -9999
comment: B9 xco2_quality_flag bit flag
qf_variables: defined_mode, eof3_3_rel, max_declocking_wco2, max_declocking_sco2, albedo_slope_sco2, rms_rel_wco2, h2o_ratio, co2_ratio, dp_o2a, dp_sco2, co2_grad_del, windspeed, dp_abp, aod_ice, xco2_uncertainty, chi2_wco2, albedo_slope_wco2, surface_type_flipped, altitude_stddev, aod_total, dws, albedo_sco2, rms_rel_sco2, aod_water, ice_height, aod_strataer, aod_oc, aod_seasalt
origname: xco2_qf_bitflag
fullnamepath: /xco2_qf_bitflag
latitude: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees_north
long_name: latitude
missing_value: -999999.0000
comment: center latitude of the measurement
origname: latitude
fullnamepath: /latitude
sensor_zenith_angle: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees
long_name: sounding_zenith
missing_value: -999999.0000
comment: zenith angle of the satellite at the time of the measurement
origname: sensor_zenith_angle
fullnamepath: /sensor_zenith_angle
Meteorology_psurf_apriori_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: B9 Band 1 Prior Surface Pressure
missing_value: -999999.0000
comment: Prior surface pressure for Band 1 location, as determined by GEOS5-FP-IT short-term (0-9 hour) forecast
origname: psurf_apriori_o2a
fullnamepath: /Meteorology/psurf_apriori_o2a
Meteorology_psurf_apriori_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: B9 Band 2 Prior Surface Pressure
missing_value: -999999.0000
comment: Prior surface pressure for Band 2 location, as determined by GEOS5-FP-IT short-term (0-9 hour) forecast
origname: psurf_apriori_wco2
fullnamepath: /Meteorology/psurf_apriori_wco2
Meteorology_psurf_apriori_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: B9 Band 3 Prior Surface Pressure
missing_value: -999999.0000
comment: Prior surface pressure for Band 3 location, as determined by GEOS5-FP-IT short-term (0-9 hour) forecast
origname: psurf_apriori_sco2
fullnamepath: /Meteorology/psurf_apriori_sco2
Meteorology_windspeed_u_met: Array of 32 bit Reals [sounding_id = 0..191238]
units: m/s
long_name: B9 Meteorology Surface Wind Speed, U Component
missing_value: -999999.0000
comment: Taken from the B9 meteorology
origname: windspeed_u_met
fullnamepath: /Meteorology/windspeed_u_met
Meteorology_psurf_apriori: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: B9 Prior Surface Pressure
missing_value: -999999.0000
comment: Prior surface pressure for sounding location, as determined by GEOS5-FP-IT short-term (0-9 hour) forecast
origname: psurf_apriori
fullnamepath: /Meteorology/psurf_apriori
Meteorology_windspeed_v_met: Array of 32 bit Reals [sounding_id = 0..191238]
units: m/s
long_name: B9 Meteorology Surface Wind Speed, V Component
missing_value: -999999.0000
comment: Taken from the B9 meteorology
origname: windspeed_v_met
fullnamepath: /Meteorology/windspeed_v_met
xco2_quality_flag: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: XCO2_Quality_Flag
missing_value: 127
comment: 0=Good, 1=Bad
origname: xco2_quality_flag
fullnamepath: /xco2_quality_flag
xco2_averaging_kernel: Array of 32 bit Reals [sounding_id = 0..191238][levels = 0..19]
units: none
long_name: XCO2 Column Averaging Kernel
missing_value: -999999.0000
comment: Normalized XCO2 averaging kernel; Defined on layer boundaries. These are oriented space-to-surface, so the first element defines the TOA, the last element defines the surface.
origname: xco2_averaging_kernel
fullnamepath: /xco2_averaging_kernel
Auxiliary_xco2_quality_flag_b8: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: XCO2_Quality_Flag_B8
missing_value: 127
comment: Version B8 QF: 0=Good, 1=Bad
origname: xco2_quality_flag_b8
fullnamepath: /Auxiliary/xco2_quality_flag_b8
Auxiliary_surface_type_flipped: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: surface_type_flipped
missing_value: 127
comment: Set to 1 if the surface type used by L2 was incorrect (land vs. water or vice-versa)
origname: surface_type_flipped
fullnamepath: /Auxiliary/surface_type_flipped
date: Array of 16 bit Integers [sounding_id = 0..191238][epoch_dimension = 0..6]
units: none
long_name: Observation date and time matching sounding_id
missing_value: -9999
comment: Year, month (1-12), day (1-31), hour (0-23), minute (0-59), second (0-59), millisecond (0,300,or 700). Note this time is chosen to correspond exactly to the first 15 digits of sounding_id
origname: date
fullnamepath: /date
Retrieval_dp_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: Delta Psurf from L2, O2A-band Prior
missing_value: -999999.0000
comment: Retrieved Psurf from the L2 Full-Physics retrieval, minus the O2A-band prior Psurf
origname: dp_o2a
fullnamepath: /Retrieval/dp_o2a
Retrieval_aod_water: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Water Cloud Optical Depth
missing_value: -999999.0000
comment: Retrieved Water Cloud Optical Depth at 0.755 microns
origname: aod_water
fullnamepath: /Retrieval/aod_water
Retrieval_s32: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Signal_band3/Signal_band2
missing_value: -999999.0000
comment: Ratio of Band 3 to Band 2 signal level
origname: s32
fullnamepath: /Retrieval/s32
Retrieval_chi2_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Band 3 Reduced Chi-Squared of L2 Fit
missing_value: -999999.0000
comment: Reduced Chi-Squared for Band 3 (Strong CO2 band) of L2 spectral fit
origname: chi2_sco2
fullnamepath: /Retrieval/chi2_sco2
Retrieval_aod_dust: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Dust Aerosol Optical Depth
missing_value: -999999.0000
comment: Retrieved Dust Aerosol Optical Depth at 0.755 microns
origname: aod_dust
fullnamepath: /Retrieval/aod_dust
Retrieval_albedo_slope_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: per wn
long_name: Retrieved Band 2 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean)
missing_value: -999999.0000
origname: albedo_slope_wco2
fullnamepath: /Retrieval/albedo_slope_wco2
Retrieval_aod_bc: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Black Carbon Optical Depth
missing_value: -999999.0000
comment: Retrieved Black Carbon Optical Depth at 0.755 microns
origname: aod_bc
fullnamepath: /Retrieval/aod_bc
Retrieval_aod_strataer: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Stratospheric Aerosol Optical Depth
missing_value: -999999.0000
comment: Retrieved Upper Trop+Stratospheric Aerosol Optical Depth at 0.755 microns
origname: aod_strataer
fullnamepath: /Retrieval/aod_strataer
Retrieval_land_brdf_weight_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 1 BRDF Amplitude (land only)
missing_value: -999999.0000
comment: Retrieved Band 1 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: land_brdf_weight_o2a
fullnamepath: /Retrieval/land_brdf_weight_o2a
Retrieval_aod_seasalt: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Sea Salt Optical Depth
missing_value: -999999.0000
comment: Retrieved Sea Salt Carbon Optical Depth at 0.755 microns
origname: aod_seasalt
fullnamepath: /Retrieval/aod_seasalt
Retrieval_windspeed_apriori: Array of 32 bit Reals [sounding_id = 0..191238]
units: m/s
long_name: Prior Surface Wind Speed
missing_value: -999999.0000
comment: Surface wind speed retrieved by the Level-2 retrieval
origname: windspeed_apriori
fullnamepath: /Retrieval/windspeed_apriori
Retrieval_land_brdf_weight_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 2 BRDF Amplitude (land only)
missing_value: -999999.0000
comment: Retrieved Band 2 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: land_brdf_weight_wco2
fullnamepath: /Retrieval/land_brdf_weight_wco2
Retrieval_albedo_slope_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: per wn
long_name: Retrieved Band 3 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean)
missing_value: -999999.0000
origname: albedo_slope_sco2
fullnamepath: /Retrieval/albedo_slope_sco2
Retrieval_tcwv_apriori: Array of 32 bit Reals [sounding_id = 0..191238]
units: kg/m^2
long_name: Total Column Water Vapor A Priori
missing_value: -999999.0000
comment: Prior TCWV (from GEOS5-FP-IT prior profile)
origname: tcwv_apriori
fullnamepath: /Retrieval/tcwv_apriori
Retrieval_co2_grad_del: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: Change in CO2 vertical gradient (surface minus level 13), retrieved-apriori
missing_value: -999999.0000
comment: level 13 is at P/Psurf=0.631579
origname: co2_grad_del
fullnamepath: /Retrieval/co2_grad_del
Retrieval_fs: Array of 32 bit Reals [sounding_id = 0..191238]
units: W/m^2/um/sr
long_name: Retrieved Fluorescence at 757 nm
missing_value: -999999.0000
comment: Simultaneous Fluorescence retrieval (at 757 nm) by L2 code; note this is different than the dedicated retrieval using only solar lines
origname: fs
fullnamepath: /Retrieval/fs
Retrieval_SigmaB: Array of 32 bit Reals [levels = 0..19]
units: dimensionless
long_name: SigmaB_Coefficient
missing_value: -999999.0000
comment: Multiply Psurf by these values to get the pressure layer boundaries (= pressure levels)
origname: SigmaB
fullnamepath: /Retrieval/SigmaB
Retrieval_albedo_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 2 Albedo
missing_value: -999999.0000
comment: Retrieved Band 2 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: albedo_wco2
fullnamepath: /Retrieval/albedo_wco2
Retrieval_tcwv: Array of 32 bit Reals [sounding_id = 0..191238]
units: kg/m^2
long_name: Total Column Water Vapor
missing_value: -999999.0000
comment: Retrieved TCWV obtained by multiplying retrieved h2o_scale factor to prior TCWV
origname: tcwv
fullnamepath: /Retrieval/tcwv
Retrieval_tcwv_uncertainty: Array of 32 bit Reals [sounding_id = 0..191238]
units: kg/m^2
long_name: Total Column Water Vapor Uncertainty
missing_value: -999999.0000
comment: Retrieved TCWV Posterior Uncertainty
origname: tcwv_uncertainty
fullnamepath: /Retrieval/tcwv_uncertainty
Retrieval_land_brdf_weight_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 3 BRDF Amplitude (land only)
missing_value: -999999.0000
comment: Retrieved Band 3 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: land_brdf_weight_sco2
fullnamepath: /Retrieval/land_brdf_weight_sco2
Retrieval_albedo_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 1 Albedo
missing_value: -999999.0000
comment: Retrieved Band 1 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: albedo_o2a
fullnamepath: /Retrieval/albedo_o2a
Retrieval_deltaT: Array of 32 bit Reals [sounding_id = 0..191238]
units: Kelvin
long_name: Retrieved Offset to Prior Temperature Profile in Kelvin
missing_value: -999999.0000
origname: deltaT
fullnamepath: /Retrieval/deltaT
Retrieval_h2o_scale: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Retrieved scale factor to Prior Water Vapor Profile
missing_value: -999999.0000
origname: h2o_scale
fullnamepath: /Retrieval/h2o_scale
Retrieval_dp_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: Delta Psurf from L2, SCO2-band Prior
missing_value: -999999.0000
comment: Retrieved Psurf from the L2 Full-Physics retrieval, minus the SCO2-band prior Psurf
origname: dp_sco2
fullnamepath: /Retrieval/dp_sco2
Retrieval_windspeed: Array of 32 bit Reals [sounding_id = 0..191238]
units: m/s
long_name: Retrieved Surface Wind Speed
missing_value: -999999.0000
comment: Surface wind speed retrieved by the Level-2 retrieval
origname: windspeed
fullnamepath: /Retrieval/windspeed
Retrieval_dpfrac: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: dpfrac
missing_value: -999999.0000
comment: xco2_raw*(1-{Meteorology/psurf_apriori_band3}/{Retrieval/psurf}
origname: dpfrac
fullnamepath: /Retrieval/dpfrac
Retrieval_t700: Array of 32 bit Reals [sounding_id = 0..191238]
units: K
long_name: Temperature_at_700hPa
missing_value: -999999.0000
comment: Temperature at 700 hPa (from GEOS5-FP-IT)
origname: t700
fullnamepath: /Retrieval/t700
Retrieval_chi2_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Band 1 Reduced Chi-Squared of L2 Fit
missing_value: -999999.0000
comment: Reduced Chi-Squared for Band 1 (O2A band) of L2 spectral fit
origname: chi2_o2a
fullnamepath: /Retrieval/chi2_o2a
Retrieval_aod_ice: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Ice Cloud Optical Depth
missing_value: -999999.0000
comment: Retrieved Ice Cloud Optical Depth at 0.755 microns
origname: aod_ice
fullnamepath: /Retrieval/aod_ice
Retrieval_iterations: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: Iterations
missing_value: 127
comment: No. of iterations used in retrieval
origname: iterations
fullnamepath: /Retrieval/iterations
Retrieval_ice_height: Array of 32 bit Reals [sounding_id = 0..191238]
units: P/Psurf
long_name: Ice Cloud Height
missing_value: -999999.0000
comment: Retrieved Ice Cloud Height
origname: ice_height
fullnamepath: /Retrieval/ice_height
Retrieval_rms_rel_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: percent
long_name: relative_rms_weak_co2_band
missing_value: -999999.0000
comment: RMS of the L2 fit residuals in the weak co2 band, relative to the continuum signal, times 100 [so it is in percent]
origname: rms_rel_wco2
fullnamepath: /Retrieval/rms_rel_wco2
Retrieval_aod_sulfate: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Sulfate Aerosol Optical Depth
missing_value: -999999.0000
comment: Retrieved Sulfate Aerosol Optical Depth at 0.755 microns
origname: aod_sulfate
fullnamepath: /Retrieval/aod_sulfate
Retrieval_dws: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Dust+Water+SeaSalt
missing_value: -999999.0000
comment: Retrieved AOD_dust+AOD_water+AOD_seasalt at 0.755 microns
origname: dws
fullnamepath: /Retrieval/dws
Retrieval_albedo_slope_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: per wn
long_name: Retrieved Band 1 reflectance slope (land), or slope of lambertian albedo component of BRDF (ocean)
missing_value: -999999.0000
origname: albedo_slope_o2a
fullnamepath: /Retrieval/albedo_slope_o2a
Retrieval_rms_rel_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: percent
long_name: relative_rms_strong_co2_band
missing_value: -999999.0000
comment: RMS of the L2 fit residuals in the strong co2 band, relative to the continuum signal, times 100 [so it is in percent]
origname: rms_rel_sco2
fullnamepath: /Retrieval/rms_rel_sco2
Retrieval_eof3_3_rel: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: 3rd EOF of Band 3, relative to Signal
missing_value: -999999.0000
comment: A scaled version of the EOF 3, Band 3 amplitude
origname: eof3_3_rel
fullnamepath: /Retrieval/eof3_3_rel
Retrieval_diverging_steps: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: diverging_steps
missing_value: 127
comment: No. of diverging steps taken in retrieval
origname: diverging_steps
fullnamepath: /Retrieval/diverging_steps
Retrieval_albedo_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Band 3 Albedo
missing_value: -999999.0000
comment: Retrieved Band 3 reflectance (land), or lambertian albedo component of BRDF (ocean)
origname: albedo_sco2
fullnamepath: /Retrieval/albedo_sco2
Retrieval_psurf_apriori_b8: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: B8 Prior Surface Pressure
missing_value: -999999.0000
comment: Prior surface pressure used in the B8 retrieval, as determined by GEOS5-FP-IT short-term (0-9 hour) forecast
origname: psurf_apriori_b8
fullnamepath: /Retrieval/psurf_apriori_b8
Retrieval_chi2_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Band 2 Reduced Chi-Squared of L2 Fit
missing_value: -999999.0000
comment: Reduced Chi-Squared for Band 2 (Weak CO2 band) of L2 spectral fit
origname: chi2_wco2
fullnamepath: /Retrieval/chi2_wco2
Retrieval_surface_type: Array of 16 bit Integers [sounding_id = 0..191238]
units: 0=ocean;1=land
long_name: Surface Type
missing_value: 127
comment: Surface type used in the retrieval: 0=ocean and corresponds to a Coxmunk+Lambertian surface; 1=land and corresponds to a pure Lambertian surface
origname: surface_type
fullnamepath: /Retrieval/surface_type
Retrieval_s31: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: Signal_band3/Signal_band1
missing_value: -999999.0000
comment: Ratio of Band 3 to Band 1 signal level
origname: s31
fullnamepath: /Retrieval/s31
Retrieval_psurf: Array of 32 bit Reals [sounding_id = 0..191238]
units: hPa
long_name: Retrieved Surface Pressure
missing_value: -999999.0000
comment: Surface pressure retrieved by the Level-2 retrieval
origname: psurf
fullnamepath: /Retrieval/psurf
Retrieval_aod_total: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Total Cloud+Aerosol Optical Depth
missing_value: -999999.0000
comment: Retrieved Total Cloud+Aerosol Optical Depth at 0.755 microns
origname: aod_total
fullnamepath: /Retrieval/aod_total
Retrieval_aod_oc: Array of 32 bit Reals [sounding_id = 0..191238]
units: dimensionless
long_name: Organic Carbon Optical Depth
missing_value: -999999.0000
comment: Retrieved Organic Carbon Optical Depth at 0.755 microns
origname: aod_oc
fullnamepath: /Retrieval/aod_oc
Retrieval_xco2_raw: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: Raw value of Retrieved XCO2
missing_value: -999999.0000
origname: xco2_raw
fullnamepath: /Retrieval/xco2_raw
Sounding_snr_sco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: snr_strong_CO2_L1b
missing_value: -999999.0000
comment: Strong CO2-Band Continuum Signal-to-Noise Ratio
origname: snr_sco2
fullnamepath: /Sounding/snr_sco2
Sounding_operation_mode: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: OCO-2 Operation Mode: 0=Nadir, 1=Glint, 2=Target, 3=Transition to/from Target
missing_value: 127
comment: Normalized XCO2 averaging kernel; Defined on layer boundaries. These are oriented space-to-surface, so the first element defines the TOA, the last element defines the surface.
origname: operation_mode
fullnamepath: /Sounding/operation_mode
Sounding_snr_wco2: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: snr_weak_CO2_L1b
missing_value: -999999.0000
comment: Weak CO2-Band Continuum Signal-to-Noise Ratio
origname: snr_wco2
fullnamepath: /Sounding/snr_wco2
Sounding_glint_angle: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees
long_name: sounding_glint_angle
missing_value: -999999.0000
comment: Angular distance from viewing along the perfect glint direction
origname: glint_angle
fullnamepath: /Sounding/glint_angle
Sounding_altitude_stddev: Array of 32 bit Reals [sounding_id = 0..191238]
units: meters
long_name: B9 Altitude Stddev
missing_value: -999999.0000
comment: Standard deviation of surface elevation within the FOV
origname: altitude_stddev
fullnamepath: /Sounding/altitude_stddev
Sounding_sensor_azimuth_angle: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees East of North
long_name: sounding_azimuth
missing_value: -999999.0000
comment: azimuth angle of the satellite at the time of the measurement
origname: sensor_azimuth_angle
fullnamepath: /Sounding/sensor_azimuth_angle
Sounding_airmass: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees
long_name: relative_airmass
missing_value: -999999.0000
comment: Airmass, computed as 1/cos(solar_zenith_angle) + 1/cos(sensor_zenith_angle)
origname: airmass
fullnamepath: /Sounding/airmass
Sounding_land_water_indicator: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: B9 Land Water Indicator
missing_value: 127
comment: 0=Land;1=Ocean;2=Inland Water;3=Mixed
origname: land_water_indicator
fullnamepath: /Sounding/land_water_indicator
Sounding_snr_o2a: Array of 32 bit Reals [sounding_id = 0..191238]
units: none
long_name: snr_O2_L1b
missing_value: -999999.0000
comment: O2A-Band Continuum Signal-to-Noise Ratio
origname: snr_o2a
fullnamepath: /Sounding/snr_o2a
Sounding_solar_azimuth_angle: Array of 32 bit Reals [sounding_id = 0..191238]
units: degrees East of North
long_name: sounding_solar_azimuth
missing_value: -999999.0000
comment: solar azimuth angle at the time of the measurement
origname: solar_azimuth_angle
fullnamepath: /Sounding/solar_azimuth_angle
Sounding_path: Array of Bytes [sounding_id = 0..191238]
units: none
long_name: OCO-2 orbit path number
missing_value: -1
comment: OCO-2 fixed orbit path number ranging from 1-233
origname: path
fullnamepath: /Sounding/path
Sounding_altitude: Array of 32 bit Reals [sounding_id = 0..191238]
units: meters
long_name: B9 Altitude
missing_value: -999999.0000
comment: Surface Altitude in meters above sea level
origname: altitude
fullnamepath: /Sounding/altitude
Sounding_l1b_type: Array of 32 bit Integers [sounding_id = 0..191238]
units: none
long_name: JPL Processing Version
missing_value: -9999
origname: l1b_type
fullnamepath: /Sounding/l1b_type
Sounding_footprint: Array of 16 bit Integers [sounding_id = 0..191238]
units: none
long_name: Footprint Number
missing_value: 127
comment: Index of OCO-2 Sounding 1-8
origname: footprint
fullnamepath: /Sounding/footprint
Sounding_land_fraction: Array of 16 bit Integers [sounding_id = 0..191238]
units: percent
long_name: Land Fraction
missing_value: 127
comment: Fraction of the footprint that contains land in percent
origname: land_fraction
fullnamepath: /Sounding/land_fraction
Sounding_orbit: Array of 32 bit Integers [sounding_id = 0..191238]
units: none
long_name: orbit number
missing_value: -9999
comment: OCO-2 orbit number since mission start
origname: orbit
fullnamepath: /Sounding/orbit
xco2_uncertainty: Array of 32 bit Reals [sounding_id = 0..191238]
units: ppm
long_name: XCO2_Posterior_Error
missing_value: -999999.0000
origname: xco2_uncertainty
fullnamepath: /xco2_uncertainty
co2_profile_apriori: Array of 32 bit Reals [sounding_id = 0..191238][levels = 0..19]
units: ppm
long_name: CO2 Apriori Profile
missing_value: -999999.0000
comment: Prior CO2 Prior assumed by L2 code; Defined on layer boundaries. These are oriented space-to-surface, so the first element defines the TOA, the last element defines the surface.
origname: co2_profile_apriori
fullnamepath: /co2_profile_apriori
vertices: Array of 16 bit Integers [vertices = 0..3]
origname: vertices
fullnamepath: /vertices
bands: Array of 16 bit Integers [bands = 0..2]
origname: bands
fullnamepath: /bands
epoch_dimension: Array of 32 bit Reals [epoch_dimension = 0..6]
footprints: Array of 16 bit Integers [footprints = 0..7]
origname: footprints
fullnamepath: /footprints
levels: Array of 16 bit Integers [levels = 0..19]
origname: levels
fullnamepath: /levels
source_files: Array of Strings [source_files = 0..14]
units: none
long_name: L2 Source File
missing_value: Missing
comment: Source L2 File Names for these soundings
origname: source_files
fullnamepath: /source_files
vertex_latitude: Array of 32 bit Reals [sounding_id = 0..191238][vertices = 0..3]
units: degrees_north
long_name: vertex_latitude
missing_value: -999999.0000
comment: corner latitudes of the measurement FOV
origname: vertex_latitude
fullnamepath: /vertex_latitude
vertex_longitude: Array of 32 bit Reals [sounding_id = 0..191238][vertices = 0..3]
units: degrees_east
long_name: vertex_longitude
missing_value: -999999.0000
comment: corner longitudes of the measurement FOV
origname: vertex_longitude
fullnamepath: /vertex_longitude