The aim of the work is to identify the patterns of the dissolved oil (DO) field structure in the Sevastopol Bay waters and the factors conditioning its state, to compare the obtained result with the available ideas on large-scale distribution of the water quality indicators on the area under study, to evaluate the current trend of the dissolved oil field state, to consider the relationship between the fields of the dissolved oil concentration, the total suspended matter (TSM) and the dissolved organic matter (DOM). Methods and Results. Based on the data of a series of the oceanological expeditions carried out by Marine Hydrophysical Institute and Institute of Natural and Technical Systems in 1999-2018, the structure of the dissolved oil content field in the Sevastopol Bay (the Black Sea) and the forming it factors are considered. The obtained result is compared with the known structural regularities of the hydrochemical elements' fields. A tendency of the state of the dissolved oil concentration field is assessed. The relationship between the fields of the dissolved oil concentration, total suspended matter and the dissolved organic matter is considered. Conclusions. It is shown that the structure of the dissolved oil content field is conditioned by interaction of the polluted waters in the Sevastopol Bay apex (spacious maximum of the substance concentration was revealed in the region of the Neftyanaya Harbor) with the pure Black Sea waters in its western region. The characteristic structural element of the field under investigation is a wellpronounced meridian frontal section observed on the Southern Bay traverse. Significant local maximum values in the dissolved oil field were observed also in the bays Kilen, Korabel'naya, Artilleriyskaya and Severnaya. The frontal section in the dissolved oil concentration field coincided with the boundary section in the hydrochemical elements' fields, which was earlier revealed in course of studying water pollution in the Sevastopol Bay. Noted are the tendency to decrease of the dissolved oil products' concentration in the Southern Bay waters and the qualitative difference of this substance structure being compared to the fields of the total suspended matter and the dissolved organic matter concentrations.

Анн отац ияНа основе данных экспедиции, проведенной Морским гидрофизическим институтом в августе 2019 г., рассмотрены закономерности структуры полей температуры, солености, концентрации общего взвешенного вещества и концентрации окрашенного растворенного органического вещества на двух смежных участках, расположенных вдоль северо-западного (участок 1) и юго-западного (участок 2) берегов Гераклейского полуострова. Использованы методы и подходы классической океанографии, основанные на анализе структуры полей рассматриваемых величин. Показано, что на участке 1 с береговой линией, ориентированной под острым углом к вектору ветра, превалировали адвективные процессы, а структура полей океанологических элементов не содержала антропогенных признаков. На участке 2, береговая линия которого расположена по нормали к вектору ветра, отмечен сгонный эффект и подъем вод из глубинных горизонтов к поверхности моря. Здесь в толще вод обнаружены линзы с пониженной соленостью, повышенным содержанием общего взвешенного и растворенного органического веществ. Эти линзы возникли под влиянием сточных вод, распространявшихся в системе восходящей циркуляции апвеллинга из находящегося рядом коллектора.Кл юч е в ые с л ов а : температура, соленость, общее взвешенное вещество, окрашенное растворенное органическое вещество, апвеллинг, загрязнение, Гераклейский полуостров, Крым Б л агодарн ос т и: исследование выполнено в рамках государственного задания ФГБУН ФИЦ МГИ по теме № 0555-2021-0005 «Комплексные междисциплинарные исследования океанологических процессов, определяющих функционирование и эволюцию экосистем прибрежных зон Черного и Азовского морей».

Purpose. Using the data obtained in the expeditions, 2001–2014, the authors intend to identify the typical features of vertical structure of the colored dissolved organic matter (fDOM) concentration field in the Kerch Strait, to type the fDOM(z) profiles, to zone the region under consideration according to a given set of the qualitative features, and also to determine the features of statistical characteristics of the fDOM concentration distribution on the sea surface layer for the water areas with a typical structure. Methods and Results. The typing was carried out by the method of visual expert assessment of the curves of vertical distribution of concentration of the considered value. It was based on analyzing the fDOM(z) profile shapes. To reveal the boundaries of the areas with typical stratification of the fDOM content field, the thermohaline field structure was analyzed. Three types of water vertical structure were identified; they differed in the fDOM(z) profile shape and in statistical indices of empirical distribution of this substance concentration on the sea surface. These are the Azov Sea and the Black Sea types peculiar to the Azov and Black seas waters not contaminated by dissolved organic matter, and the type, the structure of which identifies the waters containing the anthropogenic component in the concentration field of the analyzed value. The latter type is characterized by a special intrusive shape of the fDOM(z) profile. For each of the identified stratification types, the histograms of the fDOM concentration distribution on the sea surface were calculated. Conclusions. The fDOM(z) profiles were typed. The Kerch Strait water area was zoned in accordance with a given set of the preliminary revealed qualitative features. The boundaries of the areas with typical stratification and their displacements were determined. It is shown that each structure type has its own statistical distribution of concentration of the considered value on the sea surface