hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Sciences10.7868/S2073667318040111hydrophysics-813Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESМоделирование растворенного органического вещества в Финском заливеModelling dissolved organic nutrients in the Gulf of FinlandВладимироваО. М.VladimirovaO. M.

Санкт-Петербург

St.-Petersburg

ЕреминаТ. Р.EreminaT. R.

Санкт-Петербург

St.-Petersburg

ИсаевА. В.IsaevA. V.

Москва

Moscow

РябченкоВ. A.RyabchenkoV. A.

Москва

Moscow

СавчукО. П.SavchukO. P.

Санкт-Петербург; Стокгольм, Швеция

St.-Petersburg; Stockholm, Sweden

Российский государственный гидрометеорологический университетРоссияRussian State Hydrometeorological UniversityRussian FederationИнститут океанологии им. П.П ШиршоваРоссияShirshov Institute of Oceanology, Russian Academy of SciencesRussian FederationИнститут наук о земле, Санкт-Петербургский Государственный Университет; Балтик Нест институт, Центр Балтийского моря Стокгольмского университетаРоссияInstitute of Earth Sciences, St.-Petersburg State University; Baltic Nest Institute, Stockholm University Baltic Sea CentreRussian Federation20181711202211490101Copyright © Владимирова О.М., Еремина Т.Р., Исаев А.В., Рябченко В.A., Савчук О.П., 20222022Владимирова О.М., Еремина Т.Р., Исаев А.В., Рябченко В.A., Савчук О.П.Vladimirova O.M., Eremina T.R., Isaev A.V., Ryabchenko V.A., Savchuk O.P.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/813

Цель работы — усовершенствование Санкт-Петербургской модели эвтрофикции Балтийского моря (SPBEM) за счет включения уравнений неконсервативной примеси для растворенного органического азота и фосфора в двух формах — легкоокисляемой и стойкой. Численные эксперименты по тестированию усовершенствованной версии модели было выполнено для Финского залива для периода 2009—2014 гг. Начальные и граничные условия для численных экспериментов были получены на основе данных натурных наблюдений. Сравнение результатов моделирования с данными наблюдений показало хорошее совпадение пространственно-временной изменчивости гидрофизических и биогеохимических характеристик, в том числе почти идеальное соответствие между моделируемой и наблюдаемой динамикой органических форм азота и фосфора. Важнейшим отличием между рассчитанными и наблюдаемыми характеристиками является завышенное содержание неорганического азота и фосфора, что может быть вызвано неточностями в задании начальных и граничных условий, а также в используемых параметризациях потоков минерализации. Более тонкая настройка SPBEM-2 требует более тщательного анализа чувствительности.

St.-Petersburg model of eutrophication (SPBEM) has been modified for improving description of organic matter as a part of the nutrient biogeochemical cycles. The dynamics of labile and refractory fractions of dissolved organic nitrogen and phosphorus are now described with four additional equations. The modification was tested at the Gulf of Finland in a numerical experiment made with plausible initial and actual boundary conditions for the years 2009—2014. Comparison of simulation with the available field observations indicates quite reasonable reproducibility of seasonal and inter-annual variations of spatial distribution of hydrophysical and biogeochemical characteristics, including almost a perfect match between simulated and observed dynamic of organic nutrients. The most important distinction from natural prototypes is the overestimated total amounts of inorganic nitrogen and phosphorus, which can be caused by the deficiencies in   the prescription of initial and boundary conditions as well as in the current parameterizations of pathways and rates of mineralization fluxes. The finer tuning of SPBEM-2 requires more extensive sensitivity analysis.

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The authors declare that there are no conflicts of interest present.