INDICES AND INDICATORS OF THE ENVIRONMENTAL STATE OF THE SEBASTOPOL BAY

To support the assessment of the state of marine environment and the degree of its transformation under the climate changes and the anthropogenic impact a set of normalized indices and indicators of the environmental state of an offshore water area was developed and tested within the SebastopolBay. Water masses and bottom sediments are two principal components of marine systems. The indices and indicators of the environmental state of water masses were calculated using specialized software, i.e. the «live» interactive digital atlas of the oceanographic parameters of the SebastopolBay. Another ensemble of indices (index of pollution – PLI_site, carbon cycle attribute – γ and the time period of oxygen exhaustion – t_O2 ) was suggested for the evaluation of the state of bottom sediments. Basing on the PLI_site values water area of the bay was evaluated in terms of the pollution level and fourprovinces were identified, namely the eastern (slightly polluted), central and southern (polluted) and thewestern (severely polluted).Calculated γ values for the bottom sediments of the bay indicate a shift of the carbon cycle towardsthe predominant C_org formation and its accumulation in bottom sediments. This leads to the increasing oxygen consumption resulting in its deficit which could be evaluated in terms of the time period of oxygen exhaustion (t_O2 ). The maximum t_O2 value is 109 days and the results are indicative of unfavorable changes of the environmental state of the bay. The elaborated version of a digital atlas makes it possible to calculate indicators with different degree of temporal and spatial integration and analyze the spatial-temporal changes of indicators and parameters of the state of marine environment. The atlas is used for decision-making on the management of economic activities within the offshore part of theSebastopolBay.

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