On the Trends of Steric Level Fluctuations in the North Atlantic

We consider trends of steric fl uctuations in the North Atlantic for the period 2003–2015, which are estimated by two independent methods. The fi rst method relies on the integrated use of altimetric and gravimetric measurements. AVISO data and GRACE missions are used. The second method uses an integral estimation of steric oscillations for changes in the liquid volume due to a change in its density. Calculations were carried out according to reanalysis data of SODA, EN4, and ARMOR. We prove that a direct comparison of altimetry with GRACE data and estimates using their combination gives overestimated values of steric fl uctuations and their trends. This is due to the fact, that GRACE observations show changes in the ocean mass and consequently sea level changes in some relative reference system rather than geocentric reference system, since the eff ect of elastic deformation of the ocean fl oor and the corresponding redistribution of water volumes are not taken into account. We demonstrate that in the North Atlantic the greatest shift in these estimates with errors in the determination of steric fl uctuations is characteristic for regions near Greenland due to the contribution of the negative trend component in the GRACE data. However, the trend component in the GRACE measurements is negligible with a relative distance from the shores of Greenland, and the trends of steric oscillations calculated using the method combining AVISO and GRACE data are similar to the trends of altimetric data variability. Trends of steric level oscillations calculated from reanalysis data show a signifi cant similarity in the spatial distribution as well as with trends of sea level variation calculated from altimetric data.

Keywords

ocean level, steric fl uctuations, trend, Atlantic Ocean, satellite altimetry, GRACE, Greenland, SODA, EN4, ARMOR

Acknowledgment

This work was carried out with the financial support of the Russian Science Foundation, grant No. 18-17-00027.

Received

26.12.2018

Publication date

26.12.2018

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GOST	Belonenko T., Koldunov A. On the Trends of Steric Level Fluctuations in the North Atlantic // Issledovanie Zemli iz kosmosa – 2018. – Issue 5 C. 31-40 [Electronic resource]. URL: http://ras.jes.su/izk/s020596140003236-0-1-en (circulation date: 02.05.2024). DOI: 10.31857/S020596140003236-0
MLA	Belonenko, T., Koldunov, A. "On the Trends of Steric Level Fluctuations in the North Atlantic." Issledovanie Zemli iz kosmosa 5 (2018):31-40. DOI: 10.31857/S020596140003236-0
APA	Belonenko T., Koldunov A. (2018). On the Trends of Steric Level Fluctuations in the North Atlantic. Issledovanie Zemli iz kosmosa (5), pp.31-40 DOI: 10.31857/S020596140003236-0

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