Please Note: This dataset is retired, and is displayed for archive purposes only, and may not reflect the most updated information.
However, a newer version exists.
CYGNSS Level 3 MRG Science Data Record Version 3.2.2. DOI: https://doi.org/10.5067/CYGNS-3M322
For Version History information click here >>
However, a newer version exists.
CYGNSS Level 3 MRG Science Data Record Version 3.2.2. DOI: https://doi.org/10.5067/CYGNS-3M322
For Version History information click here >>
CYGNSS Level 3 MRG Science Data Record Version 3.2.1
(CYGNSS_L3_MRG_V3.2.1)| DOI | 10.5067/CYGNS-3M321 |
| Short Name | CYGNSS_L3_MRG_V3.2.1 |
| Description | This dataset contains the version 3.2.1 CYGNSS level 3 science data record merged storm (MRG) wind speed which combines CYGNSS storm-centric gridded (SCG) wind speeds, which are derived from the L2 Young Seas Limited Fetch (YSLF) winds for a region surrounding a given tropical cyclone (TC), with L3 Fully Developed Seas (FDS) winds away from the TC center on a 0.2x0.2 degree latitude by longitude equirectangular grid obtained from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation.
L3 MRG combines the L2 FDS and Young Seas Limited Fetch (YSLF) winds and eliminates the need to choose between them depending on sea state development and the proximity to storms. The data are provided in netCDF-4 format and extend from 1 August 2018 to the present with an approximate 6 day latency. A tapered weighted averaging scheme is used centered on the 25 m/s wind radius of the storm. The 34 knot wind radius (R34) algorithm has been updated for v3.2.1 release to center around the National Hurricane Center or the Joint Typhoon Warning Center (NHC/JTWC) reported storm center instead of the CYGNSS Vmax location. The algorithm produces global (+/- 40 deg latitude) wind speeds reported on a 0.1x0.1 deg grid every 6 hours for each tropical cyclone, although some 6-hourly increments may be missing if there are an insufficient number of satellite overpasses of the storm during that time interval. The netCDF files are output on a storm-by-storm basis. The CYGNSS is a NASA Earth System Science Pathfinder Mission that is intended to collect the first frequent space‐based measurements of surface wind speeds in the inner core of tropical cyclones. Made up of a constellation of eight micro-satellites, the observatories provide nearly gap-free Earth coverage using an orbital inclination of approximately 35° from the equator, with a mean (i.e., average) revisit time of seven hours and a median revisit time of three hours. This inclination allows CYGNSS to measure ocean surface winds between approximately 38° N and 38° S latitude. This range includes the critical latitude band for tropical cyclone formation and movement. |
| Version | 3.2.1 |
| Dataset Type | DEPRECATED |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Please contact podaac@podaac.jpl.nasa.gov for more info.
| Name | Long Name | Unit |
|---|---|---|
| best_track_r34_ne | Radial extent of 34 knot winds in north east from Best Track | km |
| best_track_r34_nw | Radial extent of 34 knot winds in north west from Best Track | km |
| best_track_r34_se | Radial extent of 34 knot winds in south east from Best Track | km |
| best_track_r34_sw | Radial extent of 34 knot winds in south west from Best Track | km |
| best_track_storm_center_lat | Storm center latitude | degrees_north |
| best_track_storm_center_lon | Storm center longitude | degrees_east |
| best_track_storm_status | Storm status | 1 |
| best_track_vmax | Maximum sustained wind speed | m s-1 |
| cygnss_r34_ne | Radial extent of 34 knot winds in north east from CYGNSS | km |
| cygnss_r34_nw | Radial extent of 34 knot winds in north west from CYGNSS | km |
| cygnss_r34_se | Radial extent of 34 knot winds in south east from CYGNSS | km |
| cygnss_r34_sw | Radial extent of 34 knot winds in south west from CYGNSS | km |
| cygnss_vmax_lat | Storm V max latitude | degrees_north |
| cygnss_vmax_lon | Storm V max longitude | degrees_east |
| epoch_time | Time Centering of Data Based on Epoch Reference | hours since 2018-08-01 00:00:00.000000000 |
| lat | Latitude | degrees_north |
| lon | Longitude | degrees_east |
| merge_method | Merge method | 1 |
| quality_flags | Per-time step quality flags | |
| range_corr_gain | Range Corrected Gain | 1e-27 dBi meter-4 |
| time | Reference time of file | hours since 2023-06-28 00:00:00.000000000 |
| time_offset | Time offset of each sample from center time | hours |
| wind_speed | Wind speed | m s-1 |
| wind_speed_uncertainty | Wind speed uncertainty | m s-1 |
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. 2024. CYGNSS Level 3 MRG Science Data Record Version 3.2.1. Ver. 3.2.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/CYGNS-3M321
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Warnock, A. M., C. S. Ruf, A. Russel, M. Al-Khaldi, R. Balasubramaniam. 2024. CYGNSS Level 3 Merged Wind Speed Data Product for Storm Force and Surrounding Environmental Winds, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 17. https://doi.org//10.1109/JSTARS.2024.3379934 |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 3.2.2 | CYGNSS Level 3 MRG Science Data Record Version 3.2.2 | 2025-05-01 | ACTIVE | 2025-05-01T00:00:00.000Z |
| 3.2.1 | CYGNSS Level 3 MRG Science Data Record Version 3.2.1 | 2024-07-21 | RETIRED. | 2024-07-21T02:35:00.000Z |
| 3.2 | CYGNSS Level 3 MRG Science Data Record Version 3.2 | 2024-01-08 | RETIRED. | 2024-01-08T19:35:00.000Z |