Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 3, pp. 314-319
Marine mucilage: manifestation in satellite remote sensing data
A. V. Medvedeva
1 , S.V. Stanichny
1 1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 30.06.2021
DOI: 10.21046/2070-7401-2021-18-3-314-319
Marine mucilage is a poorly understood phenomenon associated with the formation of colloidal structures suspended in the sea or floating on the surface. The paper presents the results of satellite observations of the areas of the Sea of Marmara containing marine mucilage during the period of its extreme manifestation in 2021. The study used high spatial resolution optical and infrared sensors of the Sentinel-2, Landsat-8, Gaofen-6 satellites, as well as data from the Sentinel-1 synthetic aperture radar. It is shown that mucilage affects the optical properties of water, the characteristics of the surface roughness and the temperature of the surface layer. The sea remote sensing reflectance for floating mucilage reached 0.6 in the near-infrared region of the spectrum, and also had high values (up to 0.1) for wavelengths of 1.6 and 2.1 μm. The features of the manifestation of ship tracks in areas with suspended mucus are considered. Warm-ups in the floating mucilage zone up to 5 °C and more relative to the surrounding waters have been recorded. In radar images, mucilage-covered areas mostly appear as areas with negative contrast, although situations where the contrast was positive were recorded for weak winds, which may be due to the presence of gas bubbles in the floating mucilage.
Keywords: marine ecosystems, remote sensing, marine mucilage, Marmara Sea
Full textReferences:
- Aleskerova A. A., Kubryakov A. A., Stanichny S. V., A two-channel method for retrieval of the Black Sea surface temperature from Landsat-8 measurements, Izvestiya, Atmospheric and Oceanic Physics, 2016, Vol. 52, No. 9, pp. 1155–1161.
- Lancelot C., The mucilage phenomenon in the continental coastal waters of the North Sea, Science of the total environment, 1995, Vol. 165, No. 1–3, pp. 83–102.
- Xu H., Yu G., Jiang H., Investigation on extracellular polymeric substances from mucilaginous cyanobacterial blooms in eutrophic freshwater lakes, Chemosphere, 2013, Vol. 93, No. 1, pp. 75–81.