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On the Influence of Hydrophysical Conditions on Representativeness of Hydrooptical Measurements for Coastal Regions of the Middle Caspian Sea as an Example

  • REMOTE SENSING OF ATMOSPHERE, HYDROSPHERE, AND UNDERLYING SURFACE
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Abstract

Remote passive optical measurements of the state of waters in water basins studied from ships, airborne platforms, or satellites are most informative because they cover a large territory and are performed at a high frequency. At the same time, for correct estimation of the remotely obtained data some in situ measurements of the state of waters in water samples, taken at a limited number of points, should be performed. Studies carried out in the coastal regions of the Middle Caspian Sea were used as an example to identify the conditions when such point-like measurements are suitable for calibrating the remote hydro-optical measurements by the Ecological Monitoring of Marine Waters (EMMA) complex onboard a cruising vessel. The limitations identified were explained through analysis of the structure of coastal waters; this structure was measured through vertical sensing of water at stations and by operating a flow-through system for determining the temperature and salinity of surface waters. An algorithm is proposed for selecting water samples suitable for calibration of remote measurement by correlating them with Secchi disk depth, and the efficiency of this method is demonstrated. We showed what hydrophysical conditions should be taken into consideration for the preliminary selection of water sampling sites for calibrating remote measurements.

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Funding

This work was supported by the Ministry of Higher Education and Science of the Russian Federation (task no. 0128-2021-0001—creation of the method, comparative data analysis), as well as by the Ministry of Science of the Republic of Kazakhstan (grant no. APOS956547) “Pilot measurements of currents on Mangystau shelf of the Caspian Sea” (conducting measurements).

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997, Moscow, Russia

    V. V. Rostovtseva, A. S. Izhitskiy, I. V. Goncharenko, B. V. Konovalov & P. O. Zavialov

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  1. V. V. Rostovtseva
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  2. A. S. Izhitskiy
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  3. I. V. Goncharenko
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  4. B. V. Konovalov
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  5. P. O. Zavialov
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Correspondence to V. V. Rostovtseva.

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The authors declare that they have no conflicts of interest.

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Translated by O. Bazhenov

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Rostovtseva, V.V., Izhitskiy, A.S., Goncharenko, I.V. et al. On the Influence of Hydrophysical Conditions on Representativeness of Hydrooptical Measurements for Coastal Regions of the Middle Caspian Sea as an Example. Atmos Ocean Opt 34, 649–657 (2021). https://doi.org/10.1134/S1024856021060208

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  • DOI: https://doi.org/10.1134/S1024856021060208

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