Revisiting tropical instability wave variability in the Atlantic ocean using SODA reanalysis

Decco, Hatsue Takanaca de; Torres, Audálio Rebelo; Pezzi, Luciano Ponzi; Landau, Luiz

doi:10.1007/s10236-017-1128-2

Cited by 7 publications

(12 citation statements)

References 57 publications

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“…The chosen band-pass filtering width allows oscillations with a period of 15-60 days and wavelengths of 4 to 20 E  longitude ( E  400-2,000 km) to pass. These are the periods and wavelengths of TIWs in the Atlantic, which were found in previous studies (e.g., de Decco et al, 2018). It is reasonable to assume that subTIWs reside within the same period and wavelength window.…”

Section: Identifying Subtiwssupporting

confidence: 61%

“…Based on these regions, we then define the temporal band-pass filtering window for subTIWs in the tropical Atlantic. To identify subTIW dominated regions, similarly to the methods used by de Decco et al (2018), we filter the model temperature output using a 2D Gaussian filter, which we first apply in time and then in space. The chosen band-pass filtering width allows oscillations with a period of 15-60 days and wavelengths of 4 to 20 E  longitude ( E  400-2,000 km) to pass.…”

Section: Identifying Subtiwsmentioning

confidence: 99%

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Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations 

Specht¹,

Jungclaus²,

Bader³

2021

Preprint

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<div> Tropical instability waves (TIWs) near the ocean surface are present in all tropical oceans and are known to be important for air-sea interactions and regional climate variability. Recent studies based on observations in the Pacific Ocean found that apart from TIWs at the surface, there also exist subsurface TIWs (subTIWs) which can alter vertical mixing. To date, most studies have focused on TIW related dynamics near the ocean surface. However, to properly assess vertical mixing in the upper ocean, improved understanding of the vertical structure of TIWs and the influence of subTIWs is needed. In this study, we show subTIW presence in the Atlantic Ocean for the first time using mooring observations.Further, we characterize subTIWs in the tropical Atlantic Ocean with a special focus on subTIW spatial and temporal variability and their effect on mixing. For this, data covering almost two decades are used that were generated from a comprehensive, global, high-resolution ocean model forced by the reanalysis ERA5. We find subTIWs between 40 m depth and the thermocline in both model and observations and unlike TIWs, subTIWs are frequently active both north and south of the Equator. The results of our study suggest that subTIWs induce a multi-layer shear structure which has the potential to destabilize the mean flow and thereby cause mixing. These effects are strongest north of the Equator where TIWs and subTIWs act simultaneously, implying possible TIW/subTIW interactions. We conclude that subTIWs are a feature of the tropical Atlantic Ocean with regionally varying implications for vertical mixing and heat fluxes. In addition, subTIWs differ from TIWs in their temporal and regional occurrences Therefore, subTIWs should be considered in future assessments of upper ocean dynamics, particularly in subTIW dominated regions. </div>

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Section: Identifying Subtiwssupporting

confidence: 61%

Section: Identifying Subtiwsmentioning

confidence: 99%

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations 

Specht¹,

Jungclaus²,

Bader³

2021

Preprint

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“…The upper‐ocean circulation in the tropical Atlantic is characterized by energetic zonal currents that facilitate a large cross‐basin volume exchange and transformation of water masses (e.g., Brandt et al., 2006; Lumpkin & Garzoli, 2005; Tuchen, Brandt, Lübbecke, & Hummels, 2022). Near the equator, the lateral and vertical shear of the zonal currents generates barotropic and baroclinic instability that supply eddy kinetic energy for the formation of Tropical Instability Waves (TIWs) (de Decco et al., 2018; Jochum et al., 2004; Masina et al., 1999; von Schuckmann et al. ; 2008; Weisberg & Weingartner, 1988).…”

Section: Introductionmentioning

confidence: 99%

Multidecadal Intensification of Atlantic Tropical Instability Waves

Tuchen

Perez

Foltz

et al. 2022

Geophysical Research Letters

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“…TIWs extract their energy through interactions with the mean background state. Some studies proposed that the undulations of the SST front associated with TIWs originate from barotropic instabilities fueled by the shear of the tropical currents system: between the NECC and the northern branch of the SEC (de Decco et al., 2018; Kelly et al., 1995; Philander, 1976, 1978; Weisberg & Weingartner, 1988) and between the SEC and the EUC (Jochum et al., 2004; Von Schuckmann et al., 2008). Several studies show nevertheless the importance of baroclinic instabilities in the generation of TIWs (e.g., Cox, 1980; Grodsky et al., 2005; McCreary & Yu, 1992).…”

Section: Introductionmentioning

confidence: 99%

Tropical Instability Waves in the Atlantic Ocean: Investigating the Relative Role of Sea Surface Salinity and Temperature From 2010 to 2018

et al. 2020

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Revisiting tropical instability wave variability in the Atlantic ocean using SODA reanalysis

Cited by 7 publications

References 57 publications

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations

Multidecadal Intensification of Atlantic Tropical Instability Waves

Tropical Instability Waves in the Atlantic Ocean: Investigating the Relative Role of Sea Surface Salinity and Temperature From 2010 to 2018

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Revisiting tropical instability wave variability in the Atlantic ocean using SODA reanalysis

Cited by 7 publications

References 57 publications

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations&#160;

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations&#160;

Multidecadal Intensification of Atlantic Tropical Instability Waves

Tropical Instability Waves in the Atlantic Ocean: Investigating the Relative Role of Sea Surface Salinity and Temperature From 2010 to 2018

Contact Info

Product

Resources

About

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations

Subsurface Tropical Instability Waves in the Atlantic Ocean in Model and Observations