Abstract
Internal solitary waves (ISW), characterized by large amplitude and long propagation distance, are widespread in global oceans. While remote sensing images have played an essential role in studying ISWs, they mainly exploit two-dimensional image information. However, with the launch of the surface water ocean topography (SWOT) satellite on December 16, 2022, a unique opportunity has emerged to capture wide-swath three-dimensional ISW-induced sea surface information. In this study, we examine ISWs in the Andaman Sea using data from the Ka-band Radar Interferometer (KaRIN), a crucial sensor onboard SWOT. KaRIN not only provides backscattering satellite images but also employs synthetic aperture interferometry techniques to retrieve wide-swath two-dimensional sea surface height measurements. Our observations in the Andaman Sea revealed the presence of ISWs characterized by dark-bright strips and surface elevation solitons. The surface soliton has an amplitude of 0.32 m, resulting in an estimation of ISW amplitude of approximately 60 m. In contrast to traditional two-dimensional satellite images or nadir-looking altimetry data, the SWOT mission’s capability to capture three-dimensional sea surface information represents a significant advancement. This breakthrough holds substantial promise for ISW studies, particularly in the context of ISW amplitude inversion.
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Data Availability Statement
The SWOT data product is made freely available by the SWOT project and the national programs that contribute to it (https://regards.cnes.fr/user/ssalto/modules/3704). The product quality is not final and will be affected by some evolutions as the SWOT project team makes progress on science data processing algorithms and instrument calibrations. The stratification data was obtained from the World Ocean Atlas 2018 (https://www.nodc.noaa.gov/OC5/woa18/).
References
Bai X L, Li X F, Lamb K G et al. 2017. Internal solitary wave reflection near Dongsha Atoll, the South China Sea. Journal of Geophysical Research: Oceans, 122(10): 7978–7991, https://doi.org/10.1002/2017jc012880.
Bai X L, Liu Z Y, Li X F et al. 2014. Generation sites of internal solitary waves in the southern Taiwan Strait revealed by MODIS true-colour image observations. International Journal of Remote Sensing, 35(11–12): 4086–4098, https://doi.org/10.1080/01431161.2014.916453.
Dong D, Yang X F, Li X F et al. 2016. SAR observation of eddy-induced mode-2 internal solitary waves in the South China Sea. IEEE Transactions on Geoscience and Remote Sensing, 54(11): 6674–6686, https://doi.org/10.1109/Tgrs.2016.2587752.
Durand M, Fu L L, Lettenmaier D P et al. 2010. The surface water and ocean topography mission: observing terrestrial surface water and oceanic submesoscale eddies. Proceedings of the IEEE, 98(5): 766–779, https://doi.org/10.1109/Jproc.2010.2043031.
Huang X D, Chen Z H, Zhao W et al. 2016. An extreme internal solitary wave event observed in the northern South China Sea. Scientific Reports, 6: 30041, https://doi.org/10.1038/srep30041.
Jia Y J, Yang J G, Lin M S et al. 2020. Global assessments of the HY-2B measurements and cross-calibrations with Jason-3. Remote Sensing, 12(15): 2470, https://doi.org/10.3390/rs12152470.
Li X F, Jackson C R, Pichel W G. 2013. Internal solitary wave refraction at Dongsha Atoll, South China Sea. Geophysical Research Letters, 40(12): 3128–3132, https://doi.org/10.1002/grl.50614.
Li X F, Zhao Z X, Han Z et al. 2008a. Internal solitary waves in the East China Sea. Acta Oceanologica Sinica, 27(3): 51–59.
Li X F, Zhao Z X, Pichel W G. 2008b. Internal solitary waves in the northwestern South China Sea inferred from satellite images. Geophysical Research Letters, 35(13): L13605, https://doi.org/10.1029/2008gl034272.
Liu B Q, Yang H, Ding X W et al. 2014. Tracking the internal waves in the South China Sea with environmental satellite sun glint images. Remote Sensing Letters, 5(7): 609–618, https://doi.org/10.1080/2150704x.2014.949365.
Magalhaes J M, Lapa I G, Santos-Ferreira A M et al. 2023. Using a tandem flight configuration between Sentinel-6 and Jason-3 to compare SAR and conventional altimeters in sea surface signatures of internal solitary waves. Remote Sensing, 15(2): 392, https://doi.org/10.3390/rs15020392.
Osborne A R, Burch T L. 1980. Internal solitons in the Andaman Sea. Science, 208(4443): 451–460, https://doi.org/10.1126/science.208.4443.451.
Santos-Ferreira A, da Silva J, Magalhaes J. 2018. SAR Mode altimetry observations of internal solitary waves in the tropical ocean, Part 1: case studies. Remote Sensing, 10(4): 644, https://doi.org/10.3390/rs10040644.
Vazquez A, Flecha S, Bruno M et al. 2009. Internal waves and short-scale distribution patterns of chlorophyll in the Strait of Gibraltar and Alboran Sea. Geophysical Research Letters, 36(23): L23601, https://doi.org/10.1029/2009gl040959.
Zhang M, Wang J, Chen X et al. 2019. An experimental study on the characteristic pattern of internal solitary waves in optical remote-sensing images. International Journal of Remote Sensing, 40(18): 7017–7032, https://doi.org/10.1080/01431161.2019.1597308.
Zhang X D, Jie Z, Fan C Q et al. 2018. Observations of internal waves with high sampling data of radar altimetry and MODIS images. International Journal of Remote Sensing, 39(21): 7405–7416, https://doi.org/10.1080/01431161.2018.1470700.
Zhang X D, Li X F. 2022. Satellite data-driven and knowledge-informed machine learning model for estimating global internal solitary wave speed. Remote Sensing of Environment, 283: 113328, https://doi.org/10.1016/j.rse.2022.113328.
Zhang X D, Li X F, Zhang T. 2020a. Characteristics and generations of internal wave in the Sulu Sea inferred from optical satellite images. Journal of Oceanology and Limnology, 38(5): 1435–1444, https://doi.org/10.1007/s00343-020-0046-1.
Zhang X D, Zhang J, Meng J M et al. 2020b. Observation of internal waves with OLCI and SRAL on board Sentinel-3. Acta Oceanologica Sinica, 39(3): 56–62, https://doi.org/10.1007/s13131-019-1510-7.
Zhang X D, Zhuang C Y, Li X F. 2022. Observations of internal solitary waves using altimetry data working in different modes. In: Proceedings of 2022 IEEE International Geoscience and Remote Sensing Symposium. IEEE, Kuala Lumpur, Malaysia, https://doi.org/10.1109/IGARSS46834.2022.9884092.
Zheng Q A, Yuan Y L, Klemas V et al. 2001. Theoretical expression for an ocean internal soliton synthetic aperture radar image and determination of the soliton characteristic half width. Journal of Geophysical Research: Oceans, 106(C12): 31415–31423, https://doi.org/10.1029/2000jc000726.
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Supported by the National Key Research and Development Program (No. 2022YFE0204600) and the National Natural Science Foundation for Young Scientists of China (No. 41906157)
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Zhang, X., Li, X. Unveiling three-dimensional sea surface signatures caused by internal solitary waves: insights from the surface water ocean topography mission. J. Ocean. Limnol. (2024). https://doi.org/10.1007/s00343-024-3286-7
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DOI: https://doi.org/10.1007/s00343-024-3286-7