CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.2

(CYGNSS_L2_SURFACE_FLUX_CDR_V1.2)
Version1.2
Processing Level2
Start/Stop Date2018-Aug-01 to Present
Short NameCYGNSS_L2_SURFACE_FLUX_CDR_V1.2
DescriptionThis dataset contains the third release, Version 1.2, of the CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record (CDR), which provides the time-tagged and geolocated ocean surface heat flux parameters with 25x25 kilometer footprint resolution with 6-7 day latency from the Delay Doppler Mapping Instrument (DDMI) aboard the Cyclone Global Navigation Satellite System (CYGNSS) constellation. CYGNSS is a NASA Earth System Science Pathfinder Mission designed to collect the first frequent space-based measurements of surface wind speeds in the inner core of tropical cyclones. The Coupled Ocean-Atmosphere Response Experiment (COARE) version 3.5 algorithm combines CYGNSS L2 CDR v1.2 ocean surface wind speed estimates with the auxiliary parameters provided by the European Centre for Medium-Range Weather Forecasts Reanalysis Version 5 (ERA5) to produce latent and sensible heat fluxes and their respective transfer coefficients. More information on how the data is produced and validated can be found in the dataset user guide (see Documentation tab). More information on the CYGNSS mission, spacecraft, instrumentation and related datasets is available here: https://podaac.jpl.nasa.gov/CYGNSS . Additional information on the CYGNSS L2 CDR v1.2 wind speed dataset is available here: https://doi.org/10.5067/CYGNS-L2C12 .
DOI10.5067/CYGNS-C2H12
MeasurementOCEANS > OCEAN HEAT BUDGET > HEAT FLUX
OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
Swath Width25 km
Platform/Sensor
CYGNSS
Platform
Name: Cyclone Global Navigation Satellite System (CYGNSS)
Orbit Period: 94.0 minutes
Inclination Angle: 35.0 degrees
/
DDMI
SENSOR
Name: Delay Doppler Mapping Instrument (DDMI)
Swath Width: 25.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectCyclone Global Navigation Satellite System (CYGNSS)
Data ProviderPublisher: PO.DAAC
Creator: CYGNSS
Release Place: PO.DAAC
Release Date: 2023-Jun-01
Resource: https://cygnss.engin.umich.edu/

FormatnetCDF-4
Keyword(s)cygnss, ddm, ddmi, doppler, delay doppler, delay, specular point, wind, winds, wind speed, heat flux, shf, lhf, sensible heat, latent heat, flux, fluxes, heat fluxes, version 1.2, v1.2, Climate Data Record, CDR
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution
Spatial Resolution: 25000 Meters x 25000 Meters
Temporal Resolution: Hourly - < Daily
 
Coverage
Region: GLOBAL
North Bounding Coordinate: 38 degrees
South Bounding Coordinate: -38 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2018-Aug-01 to Present
Granule Time Span: 2017-Mar-18 to 2024-May-20
Swath Width: 25 km
 
Projection
Projection Type: Satellite native along-track
Projection Detail: Geolocation information included for each pixel
Ellipsoid: WGS 84
 
NameLong NameUnit
air_densityAir density at surfacekg m-3
air_temperature10 meter air temperatureK
antennaReceive antenna1
boundry_layer_heightBoundry Layer Heightm
cygnss_l2_sample_indexCYGNSS L2 netCDF Sample Index
dew_point_temperatureDew Point TemperatureK
latLatitudedegrees_north
lhfLatent heat flux calculated from L2 FDS wind speedW m-2
lhf_uncertaintyLatent heat flux uncertaintyW m-2
lhf_yslfLatent heat flux calculated from YSLF wind speed product.W m-2
lhf_yslf_uncertaintyLatent heat flux YSLF uncertaintyW m-2
lonLongitudedegrees_east
prn_codeGPS PRN code1
quality_flagsPer-sample quality flags
sampleSample index1
sample_timeSample time seconds since 2023-02-01 00:00:00.499
shfSensible heat flux calculated from L2 FDS wind speedW m-2
shf_uncertaintySensible heat flux uncertaintyW m-2
shf_yslfSensible heat flux calculated from YSLF wind speed product.W m-2
shf_yslf_uncertaintySensible heat flux YSLF uncertaintyW m-2
spacecraft_idCCSDS spacecraft identifier1
spacecraft_numCYGNSS spacecraft number1
surface_pressureSurface pressurePa
surface_skin_temperatureSurface skin temperatureK
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
PUBLICATIONS
  • https://doi.org/10.1109/TGRS.2016.2541343
    Clarizia, M. P., and C. S. Ruf, 'Wind Speed Retrieval Algorithm for the Cyclone Global Navigation Satellite System (CYGNSS) Mission', IEEE Trans Geosci. Remote Sens., doi:10.1109/TGRS.2016.2541343, 2016.
  • https://doi.org/10.1175/BAMS-D-14-00218.1
    Ruf, C., R. Atlas, P. Chang, M. Clarizia, J. Garrison, S. Gleason, S. Katzberg, Z. Jelenak, J. Johnson, S. Majumdar, A. O'Brien, D. Posselt, A. Ridley, R. Rose, V. Zavorotny (2015). New Ocean Winds Satellite Mission to Probe Hurricanes and Tropical Convection. Bull. Amer. Meteor. Soc., doi:10.1175/BAMS-D-14-00218.1.
  • https://doi.org/10.1175/BAMS-D-18-0337.1
    Ruf, C., S. Asharaf, R. Balasubramaniam, S. Gleason, T. Lang, D. McKague, D. Twigg, and D. Waliser. (2019). In-Orbit Performance of the Constellation of CYGNSS Hurricane Satellites. Bull. Amer. Meteor. Soc., 100, 2009 - 2023, https://doi.org/10.1175/BAMS-D-18-0337.1.
  • https://doi.org/10.3390/rs11192294
    Crespo, J. A., Posselt, D. J., & Asharaf, S. (2019). CYGNSS Surface Heat Flux Product Development. Remote Sens. 2019, 11, 2294. DOI: 10.3390/rs11192294.
  • https://doi.org/10.1109/JSTARS.2018.2833075
    Ruf, C., R. Balasubramaniam, 'Development of the CYGNSS Geophysical Model Function for Wind Speed', IEEE J. Sel. Topics Appl. Earth Obs. Remote Sens., doi: 10.1109/JSTARS.2018.2833075, 2018.
USER'S GUIDE
DATA RECIPE
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DATA CITATION POLICY
GENERAL DOCUMENTATION
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation CYGNSS. 2023. CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.2. Ver. 1.2. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-C2H12

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Journal Reference Crespo, J. A., Posselt, D. J., and Asharaf, S.. 2019. CYGNSS Surface Heat Flux Product Development, Remote Sensing, 11, 19. https://doi.org//10.3390/rs11192294