Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 55212 10.2205/2023es000848 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ The Coherence of the Oceanic Heat Transport Through the Nordic Seas: Oceanic Heat Budget and Interannual Variability The Coherence of the Oceanic Heat Transport Through the Nordic Seas: Oceanic Heat Budget and Interannual Variability https://orcid.org/0000-0002-8805-0349 Весман Анна Викторовна Vesman Anna Viktorovna anna.vesman@gmail.com https://orcid.org/0000-0002-1257-4197 Башмачников Игорь Львович Bashmachnikov Igor L'vovich

кандидат географических наук;

candidate of geographical sciences;

 https://orcid.org/0000-0002-1782-4677 Голубкин Павел Андреевич Golubkin Pavel Andreevich https://orcid.org/0000-0001-5863-5269 Раж Рошин Raj Roshin Арктический и антарктический научно-исследовательский институт St Petersburg RU Arctic and Antarctic Research Institute St Petersburg RU Международный центр по окружающей среде и дистанционному зондированию имени Нансена Санкт-Петербург Россия Nansen International Environmental and Remote Sensing Centre Saint Petersburg Russian Federation Санкт-Петербургский государственный университет Санкт-Петербург Россия Saint Petersburg State University Saint Petersburg Russian Federation Научный фонд 'Международный центр по окружающей среде и дистанционному зондированию имени Нансена" Санкт-Петербург Россия Nansen International Environmental and Remote Sensing Centre St.Petersburg Russian Federation Центр по окружающей среде и дистанционному зондированию имени Нансена Берген Норвегия Nansen Environmental and Remote Sensing Centre Bergen Norway 20 08 2023 20 08 2023 23 3 1 26 13 12 2022 24 04 2023 https://rjes.ru/en/nauka/article/55212/view

The Atlantic Water is the main source of heat and salt in the Arctic. Properties of the Atlantic Water inflow regionally affect sea ice extent and deep water formation rate. The Atlantic Water heat transported into the Nordic Seas has a significant impact on the local climate and is investigated here along with its inter-annual variability. We use the ARMOR3D dataset, which is a collection of 3D monthly temperature, salinity and geostrophic velocities fields, derived from in situ and satellite data on a regular grid available since 1993. We compare the heat transport across seven zonal transects in the eastern part of the Nordic seas, from the Svinøy section (65◦N) to the Fram Strait (78.8◦N). The correlations of the interannual variations of the advective heat fluxes rapidly drop from Svinøy to Jan Mayen sections and between Bear Island and Sørkapp sections. This is a result of different tendencies in its interannual evolution over the latest decades in the southern and the northern parts of the study region, as well as of a differential damping of the observed periodicities along the AtlanticWater path on its way north (the amplitude of 5–6 year oscillations drops significantly faster than that of 2–3 year oscillations). A certain link between the heat fluxes and the North Atlantic Oscillation (NAO), Arctic Oscillation (AO) and East Atlantic (EA) indices is observed only at the southern sections. On the other hand, the heat fluxes at all sections show a consistent increase during the dominance of western weather typeWand a decrease – of meridional weather type C. The link is explained by the variations of the wind fields, favorable for the sea-level build-up (Ekman pumping) east of the branching of the Norwegian Current for type W and an opposite tendency for type C.

The Atlantic Water is the main source of heat and salt in the Arctic. Properties of the Atlantic Water inflow regionally affect sea ice extent and deep water formation rate. The Atlantic Water heat transported into the Nordic Seas has a significant impact on the local climate and is investigated here along with its inter-annual variability. We use the ARMOR3D dataset, which is a collection of 3D monthly temperature, salinity and geostrophic velocities fields, derived from in situ and satellite data on a regular grid available since 1993. We compare the heat transport across seven zonal transects in the eastern part of the Nordic seas, from the Svinøy section (65◦N) to the Fram Strait (78.8◦N). The correlations of the interannual variations of the advective heat fluxes rapidly drop from Svinøy to Jan Mayen sections and between Bear Island and Sørkapp sections. This is a result of different tendencies in its interannual evolution over the latest decades in the southern and the northern parts of the study region, as well as of a differential damping of the observed periodicities along the AtlanticWater path on its way north (the amplitude of 5–6 year oscillations drops significantly faster than that of 2–3 year oscillations). A certain link between the heat fluxes and the North Atlantic Oscillation (NAO), Arctic Oscillation (AO) and East Atlantic (EA) indices is observed only at the southern sections. On the other hand, the heat fluxes at all sections show a consistent increase during the dominance of western weather typeWand a decrease – of meridional weather type C. The link is explained by the variations of the wind fields, favorable for the sea-level build-up (Ekman pumping) east of the branching of the Norwegian Current for type W and an opposite tendency for type C.

 the Nordic Seas the Atlantic Water heat flux correlation loss long-term variability. The work of A. V. Vesman was done in frame of the topic 5.1.4 of the scientific-research and technological plan of Roshydromet. The research was supported by the grant from the Saint-Petersburg State University No 93016972.

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