An assessment of the mixed layer salinity budget in the tropical Pacific Ocean. Observations and modelling (1990–2009)

Hasson, Audrey; Delcroix, Thierry; Dussin, Raphaël

doi:10.1007/s10236-013-0596-2

Cited by 84 publications

(115 citation statements)

References 59 publications

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“…The model outputs (and/or its ERA-interim forcing sets) are, however, obviously not perfect. We know, for instance, that the modeled equatorial zonal current variability tends to be underestimated by about 75%, and that the modeled MLD is on average 21% shallower than the observed MLD [Hasson et al, 2013]. The roles of such biases on the present results are not clear and admittedly need to be examined in details in further studies.…”

Section: Discussionmentioning

confidence: 83%

“…The DRAKKAR model basic variables have been carefully validated in earlier studies [e.g., Barnier et al, 2006;Hasson et al, 2013]. In particular, it was shown that the model captures well the observed mean, seasonal, and interannual SSS changes of the tropical Pacific.…”

Section: Discussionmentioning

confidence: 99%

“…The roles of such biases on the present results are not clear and admittedly need to be examined in details in further studies. Moreover, Hasson et al [2013] have shown the present difficulty, not to say impossibility, to rigorously evaluate terms involved in the MLS balance using low-resolution gridded observational data only, such as gridded SSS products and surface currents estimated from altimetry and Ekman drifts. In other words, we cannot be 100% sure that the model reproduces the observed features for the good reasons.…”

Section: Discussionmentioning

confidence: 99%

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Formation and variability of the South Pacific Sea Surface Salinity maximum in recent decades

Hasson

Delcroix

Boutin

2013

J. Geophys. Res. Oceans

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International audienceThis study investigates causes for the formation and variability of the Sea Surface Salinity maximum (SSS > 36) centered near 18°S-124°W in the South Pacific Ocean over the 1990-2011 period at the seasonal time scale and above. We use two monthly gridded products of SSS based on in situ measurements, high-resolution along-track Voluntary Observing Ships thermo-salinograph data, new SMOS satellite data, and a validated ocean general circulation model with no direct SSS relaxation. All products reveal a seasonal cycle of the location of the 36-isohaline barycenter of about ±400 km in longitude in response to changes in the South Pacific Convergence Zone location and Easterly winds intensity. They also show a low frequency westward shift of the barycenter of 1400 km from the mid 1990s to the early 2010s that could not be linked to the El Nino Southern Oscillation phenomena. In the model, the processes maintaining the 22 year equilibrium of the high salinity in the mixed layer are the surface forcing (˜+0.73 pss/yr), the horizontal salinity advection (˜-0.37 pss/yr), and processes occurring at the mixed layer base (˜-0.35 pss/yr)

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Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Formation and variability of the South Pacific Sea Surface Salinity maximum in recent decades

Hasson

Delcroix

Boutin

2013

J. Geophys. Res. Oceans

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“…1), large El Niño events result in elevated SSS in the Samoa region today (Gouriou and Delcroix 2002;Hasson et al, 2013)(see Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

Abrupt Northward Shift of SPCZ position in the late-1920s Indicates Coordinated Atlantic and Pacific ITCZ Change

Linsley¹,

Dunbar²,

Lee³

et al. 2017

PAGES Mag

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“…The MLD is also of importance since it represents a reservoir for pollutants that are deposited from the atmosphere and cycled 35 between the atmosphere and the surface waters (Nerentorp Mastromonaco et al, 2017). Furthermore, temporal and spatial variability in the MLD is essential for validating and improving mixed layer parameterizations (Ling et al, 2015;Martin, 1985;Noh et al, 2002), and as diagnostics in mixed layer budgets (Hasson et al, 2013;Montégut et al, 2007). Its depth, properties and behavior also play an important role in understanding acoustic propagation in the ocean.…”

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confidence: 99%

Acoustic mapping of mixed layer depth

Stranne¹,

Mayer²,

Weidner³

et al. 2018

Preprint

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Abstract. The ocean surface mixed layer is a nearly universal feature of the world oceans. The depth of the mixed layer (MLD) influences the exchange of heat and gases between the atmosphere and the ocean and constitutes one of the major factors controlling ocean primary production as it affects the vertical distribution of biological and chemical components in near-surface waters. Direct observations of the MLD are traditionally made by means of 15 conductivity, temperature and depth (CTD) casts. However, CTD instrument deployment limits the observation of temporal and spatial variability of the MLD. Here, we present an alternative method where acoustic mapping of the MLD is done remotely by means of commercially available ship-mounted echosounders. The method is shown to be highly accurate when the MLD is well defined and biological scattering does not dominate the acoustic returns. These prerequisites are often met in the open ocean and it is shown that the method is successful in 95% 20 of data collected in the central Arctic Ocean. The primary advantages of acoustically mapping the MLD over CTD measurements are: (1) considerably higher temporal and horizontal resolutions and (2) potentially larger spatial coverage.

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An assessment of the mixed layer salinity budget in the tropical Pacific Ocean. Observations and modelling (1990–2009)

Cited by 84 publications

References 59 publications

Formation and variability of the South Pacific Sea Surface Salinity maximum in recent decades

Formation and variability of the South Pacific Sea Surface Salinity maximum in recent decades

Abrupt Northward Shift of SPCZ position in the late-1920s Indicates Coordinated Atlantic and Pacific ITCZ Change

Acoustic mapping of mixed layer depth

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