Friday, October 9, 2020

The PO.DAAC is pleased to announce the public release of the CYGNSS Level 2 Ocean Surface Heat Flux Climate Data Record (CDR) Version 1.0. More information regarding the CYGNSS mission and instrumentation is available from PO.DAAC’s mission webpage.

This dataset provides the time-tagged and geolocated ocean surface heat flux parameters with 25 x 25 kilometer footprint resolution from the Delay Doppler Mapping Instrument (DDMI) aboard the CYGNSS satellite constellation. The reported sample locations are determined by the specular points corresponding to the Delay Doppler Maps (DDMs). Version 1.0 represents the first release of the CDR product-line, and features improved ocean surface heat flux estimates as a bi-product of the improved CYGNSS L2 CDR V1.0 wind speed retrievals (used as input to compute the flux estimates), which feature track de-biasing and other calibration and algorithm improvements.

These CYGNSS retrieved winds cover the global tropical oceans within a latitude domain of approximately 40° S to 40° N from 18 March 2017 to 31 August 2020 with a forward production latency of approximately 2 months (or better) from the last recorded measurement time. Only one netCDF-4 data file is produced each day (each file containing data from a combination of up to 8 unique CYGNSS spacecraft). The data, associated documentation, tools and services are described and discoverable via the PO.DAAC data portal.


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

Reference: Crespo, J. A., Posselt, D. J., & Asharaf, S. (2019). CYGNSS Surface Heat Flux Product Development. Remote Sens. 2019, 11, 2294. DOI: 10.3390/rs11192294.

Comments/Questions? Please contact or visit the PO.DAAC Ocean Wind Forum.