2022
DOI: 10.1175/jpo-d-21-0315.1
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Sources and Pathways of Intraseasonal Meridional Kinetic Energy in the Equatorial Atlantic Ocean

Abstract: In the equatorial Atlantic Ocean, meridional velocity variability exhibits a pronounced peak on intraseasonal timescales whereas zonal velocity dominantly varies on seasonal to interannual timescales. We focus on the intraseasonal meridional velocity variability away from the near-surface layer, its source regions and its pathways into the deep ocean. This deep intraseasonal velocity variability plays a key role in equatorial dynamics as it is an important energy source for the deep equatorial circulation. The… Show more

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Cited by 15 publications
(14 citation statements)
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“…First, we will focus on meridional velocity fluctuations averaged between the uppermost available velocity records and 75 m. The derived fluctuations are a manifestation of TIWs, a continuous band of wave‐like structures passing the mooring site from east to west, thereby changing the flow direction from northward in the leading phase of a TIW to southward in the subsequent phase. The moored velocity records show that the amplitude of the meridional velocity fluctuations undergoes a distinct seasonal cycle (Körner et al., 2022; Tuchen et al., 2018) with increasing amplitudes during boreal spring and early summer, maximum velocities occasionally exceeding 50 cm/s in boreal summer and early fall before decreasing again in late boreal fall and winter. Despite the seasonality, the record also reveals strong year‐to‐year variability in the strength and occurrence of TIWs.…”
Section: Upper Ocean Meridional Velocity Fluctuations At 0°n 23°wmentioning
confidence: 99%
“…First, we will focus on meridional velocity fluctuations averaged between the uppermost available velocity records and 75 m. The derived fluctuations are a manifestation of TIWs, a continuous band of wave‐like structures passing the mooring site from east to west, thereby changing the flow direction from northward in the leading phase of a TIW to southward in the subsequent phase. The moored velocity records show that the amplitude of the meridional velocity fluctuations undergoes a distinct seasonal cycle (Körner et al., 2022; Tuchen et al., 2018) with increasing amplitudes during boreal spring and early summer, maximum velocities occasionally exceeding 50 cm/s in boreal summer and early fall before decreasing again in late boreal fall and winter. Despite the seasonality, the record also reveals strong year‐to‐year variability in the strength and occurrence of TIWs.…”
Section: Upper Ocean Meridional Velocity Fluctuations At 0°n 23°wmentioning
confidence: 99%
“…Through their impact on SST, TIWs also feed back onto the large‐scale atmospheric circulation (Caltabiano et al., 2005; Seo & Xie, 2011; Seo et al., 2007; Wu & Bowman, 2007b). More recently, TIWs and intraseasonal waves excited by TIWs have been identified as an important component and maintenance mechanism of the deep equatorial Atlantic circulation (Ascani et al., 2010, 2015; Bastin et al., 2020; Greatbatch et al., 2018; Körner et al., 2022; Tuchen et al., 2018).…”
Section: Introductionmentioning
confidence: 99%
“…. More recently, TIWs and intraseasonal waves excited by TIWs have been identified as an important component and maintenance mechanism of the deep equatorial Atlantic circulation (Ascani et al, 2010(Ascani et al, , 2015Bastin et al, 2020;Greatbatch et al, 2018;Körner et al, 2022;Tuchen et al, 2018).…”
mentioning
confidence: 99%
“…Although the EDJs' generation mechanisms are still not entirely clear, it is thought that they are excited by intraseasonal Yanai waves that originate from instabilities in the western boundary currents and/or between the near-surface ocean currents, for example in the form of Tropical Instability Waves (d 'Orgeville et al, 2007;Hua et al, 2008;Ascani et al, 2015;Ménesguen et al, 2019). Although Tropical Instability Waves are generated near the surface, they sometimes excite intraseasonal variability that can propagate to depths of a few thousand metres (Tuchen et al, 2018;Körner et al, 2022), where they can provide energy to the EDJ.…”
Section: Introductionmentioning
confidence: 99%