Морской гидрофизический журнал. 2024; 40: 402-425
Сравнительный анализ процессов тепломассопереноса, рассчитанных по инструментальным измерениям и по продуктам океанского реанализа, в проливе Фрама
Аннотация
Цель. Представлен сравнительный анализ потоков объема воды, тепла и соли, рассчитанных по данным инструментальных наблюдений на автономных буйковых станциях в проливе Фрама и по продуктам реанализов GLORYS2v4, ORAS5, GloSea5 и C-GLORSv7.
Методы и результаты. Данные автономных буйковых станций интерполировались в узлы регулярной сетки с шагом 0,25° по долготе и 10 м по глубине с помощью ординарного кригинга. Расчет потоков выполнялся по единым алгоритмам для инструментальных данных и продуктов реанализа для временного интервала с 1997 по 2018 г. Получены временные серии тепломассопереноса в узлах регулярной сетки для разреза через пролив Фрама (8° з. д., 8° в. д.) по данным автономных буйковых станций и реанализов. Произведено сравнение и визуализация результатов.
Выводы. Показано, что ансамбль реанализов в целом на 25 % недооценивает переносы объема воды и тепла, рассчитанные по данным наблюдений. Наилучшее согласование продуктов реанализа с результатами расчетов по данным наблюдений получено для ядра Западно-Шпицбергенского течения с наиболее полным покрытием данными наблюдений. Выявлено, что ансамбль моделей наилучшим образом описывает изменчивость данных наблюдений. Уточнено, что реанализы FOAM и CGLO описывают большую часть временной изменчивости потоков, рассчитанных по данным автономных буйковых станций. Показано, что согласованность в зимний период (октябрь – март) выше, чем в летний (апрель – сентябрь). Это может быть связано как с недостатками реанализов (учет таяния льда), так и с тем, что автономные буйковые станции обычно меняются в летний период, что может приводить к дополнительным ошибкам при объединении временных серий.
Список литературы
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Morskoy Gidrofizicheskiy Zhurnal. 2024; 40: 402-425
Comparison Analysis of Heat and Mass Transport through Fram Strait Calculated Using the Mooring and Ocean Reanalysis Data
Abstract
Purpose. The paper represents a comparison analysis of water, heat and salt flows transported through Fram Strait and calculated using the data both of moorings in the strait and the GLORYS2v4, ORAS5, GloSea5 and C-GLORSv7 reanalysis.
Methods and Results. The data obtained at the autonomous buoy stations were interpolated in the nodes of a regular grid with the resolutions 0.25° over longitude and 10 m over depth using the Ordinary Kriging. The algorithms unified both for the mooring and reanalysis data were applied to calculate the transport flows in 1997–2018. The data of moorings and reanalysis constituted a base for obtaining the time series of heat and mass transport in the regular grid nodes at the cross-section in Fram Strait (8° W, 8° E). The mooring and reanalysis time series were compared, and the results were visualized.
Conclusions. It is shown that the reanalysis ensemble, on the whole, underestimates the transfer of water and heat volumes calculated using the observation data, by 25 %. The best agreement between the reanalysis products and the calculation results based on the observation data is obtained for the West Spitsbergen Current core which is most completely supplied with the observation data. It is revealed that the ensemble of models describes the observation data variability the best, and the FOAM and CGLO reanalysis – the greater part of temporal variability of the flows calculated by the autonomous buoy station data. The data consistency in the winter period (October – March) is shown to be higher than that in the summer one (April – September). That can be related both to the reanalysis imperfections (ice melt accounting) and the season, namely summer, when the autonomous buoy stations are usually replaced, which can result in additional errors in combining the time series.
References
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