The SWOT KaRIn Level-3 Wind Wave product (L3_LR_WIND_WAVE) is an innovative product derived from the Unsmoothed L3_LR_SSH product (https://doi.org/10.24400/527896/A01-2024.003), which is based on the algorithm presented by Ardhuin et al. (2024; https://doi.org/10.1029/2024GL109658). L3_LR_WIND_WAVE takes advantage of the KaRIn Low Rate (LR) chain's ability to resolve waves with wavelengths greater than 500 meters (approximately 18 seconds) and provides detailed information on the characteristics of these wave regimes. This includes significant wave height (SWH), dominant wavelength, and wave propagation direction. These regimes are associated with long-period swells and extreme events that play a critical role in ocean dynamics, coastal processes, and maritime operations. The SWOT L3_LR_WIND_WAVE product is organized into two subproducts, "Light" and "Extended". The L2_LR_SSH "Light" product is described in this metadata sheet. The "Light" L3_LR_WIND_WAVE (also known as the "lightweight" product) includes the SWOT L3_LR_SSH 250-m SSHA spectrum, corrected for instrumental effects and expressed in both Cartesian and polar coordinates. It also includes the swell partition of the spectrum and the wave parameters integrated over this partition, for both the WW3 model and the KaRIn model (significant wave height, wavelength, and direction). The "Extended" L3_LR_WIND_WAVE includes the aforementioned variables plus the WW3 spectrum in the same frequency grid as the KaRIn spectrum and the KaRIn transfer functions used for correction, as well as some parameters derived from KaRIn observations (e.g., coherence, mean backscatter).

The SWOT KaRIn Level-3 Wind Wave product (L3_LR_WIND_WAVE) is an innovative product derived from the Unsmoothed L3_LR_SSH product (https://doi.org/10.24400/527896/A01-2024.003), which is based on the algorithm presented by Ardhuin et al. (2024; https://doi.org/10.1029/2024GL109658). L3_LR_WIND_WAVE takes advantage of the KaRIn Low Rate (LR) chain's ability to resolve waves with wavelengths greater than 500 meters (approximately 18 seconds) and provides detailed information on the characteristics of these wave regimes. This includes significant wave height (SWH), dominant wavelength, and wave propagation direction. These regimes are associated with long-period swells and extreme events that play a critical role in ocean dynamics, coastal processes, and maritime operations. The SWOT L3_LR_WIND_WAVE product is organized into two subproducts, "Light" and "Extended". The L2_LR_SSH "Extended" product is described in this metadata sheet. The "Light" L3_LR_WIND_WAVE (also known as the "lightweight" product) includes the SWOT L3_LR_SSH 250-m SSHA spectrum, corrected for instrumental effects and expressed in both Cartesian and polar coordinates. It also includes the swell partition of the spectrum and the wave parameters integrated over this partition, for both the WW3 model and the KaRIn model (significant wave height, wavelength, and direction). The "Extended" L3_LR_WIND_WAVE includes the aforementioned variables plus the WW3 spectrum in the same frequency grid as the KaRIn spectrum and the KaRIn transfer functions used for correction, as well as some parameters derived from KaRIn observations (e.g., coherence, mean backscatter).

The Level-2P (L2P) products are pre-operational homogenized, mono-mission satellite altimetry datasets generated by the DUACS production system. They provide along‑track SLA data together with the full set of standardised geophysical and environmental corrections (e.g., tide‑free sea level, inverse barometer, sea‑state bias, atmospheric corrections). The L2P SLA datasets are the primary input for the higher‑order DUACS processing chain that yields the operational sea‑level (Level-3 and Level-4) products distributed by the Copernicus Marine Service (CMS) and the Copernicus Climate Change Service (C3S). **Processing Timeliness:** - **Near-Real-Time (NRT)**: Rapid delivery windows (under 3h – up to 24h for the newest passes) for operational marine forecasting. - **Short Time Critical (STC)**: Intermediate latency (24h – 3 days) streams optimized for quick-turnaround cal/val and monitoring. - **Non-Time Critical (NTC)**: Science‑quality dataset (30 days – up to 90 days) with the most stable baseline corrections; foundation for long‑term climate analyses. The L2P SLA NRT/STC 20Hz data products version 4.0 (DUACS DT 2024 baseline) are available for the following missions: Jason-3, Sentinel‑6 Michael Freilich (MF) and SWOT. The L2P SLA NTC 1Hz data products version 4.0 (DUACS DT 2024 baseline) are available for the following missions: ERS‑1, TOPEX/Poseidon, ERS‑2, Geosat‑Follow‑On, Jason‑1, Envisat, Jason‑2, CryoSat‑2, Haiyang‑2A, SARAL/AltiKa, Jason‑3, Sentinel‑3A, Sentinel‑3B, Sentinel‑6 Michael Freilich (MF) and SWOT.

The Level-2P (L2P) products are pre-operational homogenized, mono-mission satellite altimetry datasets generated by the DUACS production system. They provide 1‑Hz along‑track SLA data together with the full set of standardised geophysical and environmental corrections (e.g., tide‑free sea level, inverse barometer, sea‑state bias, atmospheric corrections). The L2P SLA datasets are the primary input for the higher‑order DUACS processing chain that yields the operational sea‑level (Level-3 and Level-4) products distributed by the Copernicus Marine Service (CMS) and the Copernicus Climate Change Service (C3S). **Processing Timeliness:** - **Near-Real-Time (NRT)**: Rapid delivery windows (under 3h – up to 24h for the newest passes) for operational marine forecasting. - **Short Time Critical (STC)**: Intermediate latency (24h – 3 days) streams optimized for quick-turnaround cal/val and monitoring. - **Non-Time Critical (NTC)**: Science‑quality dataset (30 days – up to 90 days) with the most stable baseline corrections; foundation for long‑term climate analyses. The L2P SLA NRT/STC 20Hz data products version 3.0 (DUACS DT 2021 baseline) are available for the following missions: Jason-3, Sentinel‑3A, Sentinel‑3B and Sentinel‑6 Michael Freilich (MF). The L2P SLA NTC 1Hz data products version 3.0 (DUACS DT 2021 baseline) are available for the following missions: ERS‑1, TOPEX/Poseidon, ERS‑2, Geosat‑Follow‑On, Jason‑1, Envisat, Jason‑2, CryoSat‑2, Haiyang‑2A, SARAL/AltiKa, Jason‑3, Sentinel‑3A, Sentinel‑3B and Sentinel‑6 Michael Freilich (MF).