Abstract—A method is proposed for constructing a regional algorithm to calculate the thickness of the euphotic zone from in situ measurements of the vertical profiles of the beam attenuation coefficient under the condition of one-parameter optical properties of water (Case-1 water). Using the proposed methodology, a regional algorithm for determining the thickness of the photic zone was developed based on the results of synchronous measurements of the beam attenuation coefficient and photosynthetically active radiation, performed in January 2022 as part of cruise 87 of the R/V Akademik Mstislav Keldysh for the northwestern Weddell Sea. For this region, an equation was obtained that can estimate the depth of the photic zone with a relative reconstruction error of 18%.
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Funding
Expeditionary research was carried within state tasks for the following institutions: MHI RAS, topic no. FNNN-2022-0001 “Experimental Studies of the Variability of Hydrophysical, Hydrochemical, and Biooptical fields at Different Spatiotemporal Scales to Identify Specific Features of Climate Change in Oceanographic Conditions in the Atlantic Part of the Antarctic” and topic no. FNNN-2021-0003 “Development of Methods for Operational Oceanology based on Interdisciplinary Studies of the Formation and Evolution of the Marine Environment and Mathematical Modeling Using Data from Remote Sensing and Contact Measurements”; POI FEB RAS, topic no. 0211-2021-0007 “Technologies for Remote Sensing of the Earth and Ground-Based Measuring Systems in Integrated Studies of Dynamic Phenomena in the Ocean and Atmosphere” and topic no. FWMM-2022-0033 “Integrated Studies of the Environment and Climate of the Southern Ocean.” The regional algorithm was developed with the support of the Russian Science Foundation (project no. 21-77-10059).
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Latushkin, A.A., Salyuk, P.A., Suslin, V.V. et al. A Regional Algorithm for Calculating the Thickness of the Photic Zone from the Vertical Profile of the Beam Attenuation Coefficient with a Case Study of the Northwestern Weddell Sea. Oceanology 63, 545–549 (2023). https://doi.org/10.1134/S0001437023040082
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DOI: https://doi.org/10.1134/S0001437023040082