Exploring the impact of southern ocean sea ice on the Indian Ocean swells.

Autor: Sreejith M; Ministry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Telangana, 500 090, India.; School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad, Cochin, 682506, India., P G R; Ministry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Telangana, 500 090, India. remya.pg@incois.gov.in., Kumar BP; Ministry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Telangana, 500 090, India., Raj A; Ministry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Telangana, 500 090, India.; School of Ocean Science and Technology, Kerala University of Fisheries and Ocean Studies, Panangad, Cochin, 682506, India., Nair TMB; Ministry of Earth Sciences (MoES), Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Telangana, 500 090, India.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Jul 20; Vol. 12 (1), pp. 12360. Date of Electronic Publication: 2022 Jul 20.
DOI: 10.1038/s41598-022-16634-0
Abstrakt: The present study analyzes the impact of the Southern Ocean (SO) sea ice concentration on the north Indian Ocean (NIO) wave fields through swells using 6 years (2016-2021) of WAVEWATCH III (WWIII) simulations. We did two experimental runs of WWIII, one with sea ice concentration and winds as the forcing (W3 with_ice ) and the second run with only wind forcing (W3 no_ice ). Analysis shows the impact of the SO sea ice concentration on northward swell peaks in September-November, coinciding with the maximum sea ice extent in the Antarctic region of the Indian Ocean. W3 no_ice simulations are biased more by ~ 60% and ~ 37% in significant wave height and period, respectively, against W3 with_ice when compared with NIO mooring data. W3 no_ice simulates low-frequency swells and travels fast towards NIO, with implications for operational oceanography. We have shown that the forecasts of the timing of high swell events along NIO coasts can be erroneous by ~ 12 h if the SO sea ice concentration is not included in the model. Further, W3 no_ice could potentially produce false swell alerts along southeastern Australian coasts. In summary, our study highlights the importance of the SO sea ice concentration inclusion in the wave models to accurately simulate NIO waves.
(© 2022. The Author(s).)
Databáze: MEDLINE
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