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

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 som...

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Bibliographic Details
Published in:Atmospheric and oceanic optics 2021-11, Vol.34 (6), p.649-657
Main Authors: Rostovtseva, V. V., Izhitskiy, A. S., Goncharenko, I. V., Konovalov, B. V., Zavialov, P. O.
Format: Article
Language:English
Subjects:
Algorithms
Calibration
Coastal structures
Coastal waters
Coastal zone
Ecological monitoring
High frequency
Hydrosphere
In situ measurement
Lasers
Marine ecology
Optical Devices
Optical measurement
Optics
Photonics
Physics
Physics and Astronomy
Remote monitoring
Remote Sensing of Atmosphere
Ships
Surface water
Underlying Surface
Water analysis
Water sampling
Work platforms
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Summary: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.
ISSN:1024-8560
2070-0393
DOI:10.1134/S1024856021060208