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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2022, Vol. 19, No. 3, pp. 281-294

Variability of sea level and circulation in the North Atlantic from satellite altimetry

V.N. Malinin 1 , Ya.I. Angudovich 1 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
Accepted: 08.06.2022
DOI: 10.21046/2070-7401-2022-19-3-281-294
The paper discusses the relationship between interannual sea level fluctuations and the system of currents in the area of the North Atlantic Anticyclonic Water Gyre (NAWC) according to satellite altimetry (1993–2019). The initial data was the base of monthly average data on the sea level of the Copernicus reanalysis archive GLOBAL_REANALYSIS_PHY_001_030. A clearly expressed relationship between the annual discharges of the Florida Current and the level gradient in the section of 25° latitude between 80–78° W was revealed (r = 0.80). Calculation of interannual sea level changes on the latitudinal section 26° for its individual sections and across the entire North Atlantic (NA) within 80–15° W, which is a reference in the monitoring of the Atlantic meridional overturning circulation (AMOC), was performed. Annual estimates of the level gradient Δh and its average values hav between the extreme points of the sections were considered. A high positive correlation between Δh and hav was revealed for sections 70–25° W (r = 0.81) and 80–15° W (r = 0.71), as well as the North Atlantic Oscillation with Δh and hav on these sections. It is shown that, despite the sharp weakening of the AMOS until 2010, later on, its relative power recovers almost to the average value. Obviously, the weakening of AMOS until 2010 is only the negative phase of its longer fluctuations. Statistical parametrization of average annual values of water transport at latitude 26° N was performed north and south (AMOC and QUMO) according to ocean level data at this latitude. Regression equations are obtained, which, according to the Δh and havdata, quite accurately (77–92 %) describe the dispersion of the AMOC and QUMO time series.
Keywords: North Atlantic, sea level, currents, North Atlantic Subtropical Gyre, Atlantic meridional overturning circulation, self-oscillating system
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