CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

(CYGNSS_L2_SURFACE_FLUX_CDR_V1.0)

Citation metrics available for years (2014-2022)

Publications citing CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

Citation metrics available for years (2014-2022)

Year	Citation
2021	CYGNSS, 2020a: CYGNSS Level 2 Ocean Surface Flux Climate Data Record. Version 1.0. PO.DAAC, accessed 1 November 2020, https://doi.org/10.5067/CYGNS-C2H10 CYGNSS observations and analysis of low-latitude extratropical cyclones, Journal ,10.1175/JAMC-D-20-0190.1
2021	CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record, Version 1.0 ed; PO.DAAC: Pasadena, CA, USA. Available online: https://doi.org/10.5067/CYGNS-C2H10 (accessed on 21 March 2021). The CYGNSS mission: On-going science team investigations, Journal ,10.3390/rs13091814
2022	Exploring CYGNSS mission for surface heat flux estimates and analysis over tropical oceans, Frontiers in Marine Science ,10.3389/fmars.2022.1001491

Information
Coverage
Data Access
Variables
Documentation
Citation
Version History

Version	1.0
Processing Level	2
Start/Stop Date	2017-Mar-18 to 2022-Feb-01
Short Name	CYGNSS_L2_SURFACE_FLUX_CDR_V1.0
Description	This dataset contains the first release, Version 1.0, 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 1-2 month latency from the Delay Doppler Mapping Instrument (DDMI) aboard the CYGNSS satellite constellation. The Cyclone Global Navigation Satellite System (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 v1.0 ocean surface wind speed estimates with the auxiliary parameters provided by the NASA Modern-Era Retrospective Analysis for Research and Applications Version 2 (MERRA-2) 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 v1.0 wind speed dataset is available here: https://doi.org/10.5067/CYGNS-L2C10.
DOI	10.5067/CYGNS-C2H10
Measurement	OCEANS > OCEAN HEAT BUDGET > HEAT FLUX OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
Swath Width	25 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.
Project	Cyclone Global Navigation Satellite System (CYGNSS)
Data Provider	Publisher: PO.DAAC Creator: CYGNSS Release Place: PO.DAAC Release Date: 2020-Oct-08 Resource: https://cygnss.engin.umich.edu/
Format	netCDF-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 1.0, v1.0, version 1, v1, 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: 40 degrees South Bounding Coordinate: -40 degrees West Bounding Coordinate: -180 degrees East Bounding Coordinate: 180 degrees Time Span: 2017-Mar-18 to 2022-Feb-01 Granule Time Span: 2017-Mar-18 to 2021-Jan-31 Swath Width: 25 km Projection Projection Type: Satellite native along-track Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84

DIRECT ACCESS
Browse Granule Listing
https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2205618975-POCLOUD
OPENDAP DATA
https://podaac.jpl.nasa.gov/OPeNDAP-in-the-Cloud
Search Granules
https://search.earthdata.nasa.gov/search/granules?p=C2205618975-POCLOUD
DIRECT S3-ACCESS
Available for access in-region with AWS Cloud
Region
us-west-2
Bucket/Object Prefix: Protected buckets contain the data files for a given collection. Protected simply means users must log in to Earthdata Login before gaining access to contents within that S3 Bucket. Please use the S3Credential endpoint to gain an Earthdata login token for use in S3 Access. Public buckets, in contrast, house metadata such as checksums, imagery, and metadata files and the like. A user can access public buckets and these types of files without logging in to Earthdata Login. Most of the time, you'll want to access the protected bucket Information
podaac-ops-cumulus-protected/CYGNSS_L2_SURFACE_FLUX_CDR_V1.0/
podaac-ops-cumulus-public/CYGNSS_L2_SURFACE_FLUX_CDR_V1.0/
AWS S3 Credentials
Get AWS S3 Credentials \| Documentation

Name	Long Name	Unit
air_density	Air density at surface	kg m-3
air_temperature	10 meter air temperature	K
cygnss_l2_sample_index	CYGNSS L2 netCDF Sample Index
effective_surface_humidity	Effective surface specific humidity	kg kg-1
lat	Latitude	degrees_north
lhf	Latent heat flux calculated from L2 FDS wind speed	W m-2
lhf_uncertainty	Latent heat flux uncertainty	W m-2
lhf_yslf	Latent heat flux calculated from YSLF NBRCS wind speed product.	W m-2
lhf_yslf_uncertainty	Latent heat flux YSLF uncertainty	W m-2
lon	Longitude	degrees_east
prn_code	GPS PRN code	1
quality_flags	Per-sample quality flags
sample	Sample index	1
sample_time	Sample time	seconds since 2017-03-18 00:00:00.999
shf	Sensible heat flux calculated from L2 FDS wind speed	W m-2
shf_uncertainty	Sensible heat flux uncertainty	W m-2
shf_yslf	Sensible heat flux calculated from YSLF NBRCS wind speed product.	W m-2
shf_yslf_uncertainty	Sensible heat flux YSLF uncertainty	W m-2
spacecraft_id	CCSDS spacecraft identifier	1
spacecraft_num	CYGNSS spacecraft number	1
specific_humidity	10 meter specific humidity	kg kg-1
surface_pressure	Surface pressure	Pa
surface_skin_temperature	Surface skin temperature	K

PUBLICATIONS
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/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/10.1109/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.
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/10.1175/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.
DATA RECIPE
https://github.com/podaac/data-readers Generic Data Readers
USER'S GUIDE
https://cygnss.engin.umich.edu/wp-content/uploads/sites/534/2021/06/CYGNSS_Handbook_April2016.pdf Deriving Surface Winds from Tropical Cyclones
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/148-0382-1_Level2_Surface_Flux_netCDF_Data_Dictionary.xlsx Data Variable Dictionary
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/cygnss_l2_cdr_heat_flux_user_guide_v1.pdf User Guide for the CYGNSS CDR Surface Flux Dataset
https://doi.org/10.3998/mpub.12741920 CYGNSS Handbook
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L2/docs/148-0138_ATBD_L2_Wind_Speed_Retrieval_Rev5_Aug2018_release.pdf Level 2 Wind Speed Retrieval Algorithm Theoretical Basis Document, M. P. Clarizia, V. Zavarotny, C. Ruf, CYGNSS Project Document 148-0138, Rev 5, 17 Aug. 2018.
ANOMALIES
https://docs.google.com/spreadsheets/d/1AFAZanVGDApLSnJQAAdPfOKoJQs0jnB8ZvIuD1Z5mAc/edit#gid=0 Google Sheet Log of Anomalous CYGNSS Sampling Events
DATA CITATION POLICY
https://podaac.jpl.nasa.gov/CitingPODAAC Data Use and Citation Policy
GENERAL DOCUMENTATION
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_1.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_2.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_3.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_4.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_5.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_6.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_7.txt Updated Monthly
https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/cygnss/open/L1/docs/att_tables/Attitude_Table_FM_8.txt Updated Monthly

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. 2020. CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-C2H10

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For more information see Data Citations and Acknowledgments.

Journal Reference

Crespo, J. A., Posselt, D. J., & Asharaf, S.. 2022. CYGNSS Surface Heat Flux Product Development, Remote Sensing, 11, 19. https://doi.org/10.3390/rs11192294

Version	Dataset	Version Date	Status
1.2	CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.2	2023-04-03	COMPLETE	2023-04-03T16:44:00.000Z
1.1	CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.1	2022-04-05	ACTIVE	2022-04-05T15:40:00.000Z
1.0	CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0	2022-03-16	COMPLETE	2022-03-16T23:53:00.000Z

Cloud Enabled

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COMPLETE

Short Name:

CYGNSS_L2_SURFACE_FLUX_CDR_V1.0

Collection Concept ID:

C2205618975-POCLOUD

Spatial Coverage:

N: 40°

S: -40°

E: 180°

W: -180°

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CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

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CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

Publications citing CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record Version 1.0

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