Understanding the annual cycle in global steric height

Giglio, Donata; Roemmich, Dean; Cornuelle, Bruce D.

doi:10.1002/grl.50774

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…It is also seen that the deep‐ocean wind‐driven flow in the Southwest Pacific Ocean interior varies modestly at the seasonal time scale. According to Giglio et al (2013) and Giglio (2014), the seasonal variability of isopycnal displacement in the upper ocean is related to Ekman pumping. Our measurements suggest that the seasonal displacements extend downward, perhaps to 3,000 or 4,000 dbar, and hence that the southward recirculation of the DWBC may be influenced by seasonal Ekman pumping.…”

Section: Discussionmentioning

confidence: 99%

Deep‐Ocean Circulation in the Southwest Pacific Ocean Interior: Estimates of the Mean Flow and Variability Using Deep Argo Data

Zilberman

Roemmich

Gilson

2020

Geophysical Research Letters

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The spatial structure and time variability of the global deep‐ocean circulation are poorly understood due to limited sampling below 2,000‐m depth. A Deep Argo array deployed in 2016 has significantly increased oceanic measurements from the ocean surface to near the sea floor in the Southwest Pacific Basin interior. Deep Argo profiles collected between 2016 and 2019 show that 4.3–4.7 Sv between 1,500 and 4,800 m, relative to 4,800 m, of the Deep Western Boundary Current flowing along the Tonga Kermadec Ridge is redirected southward over the abyssal plain between the Tonga Kermadec Ridge and the East Pacific Rise. The southward recirculation of the Deep Western Boundary Current exhibits seasonality that may be influenced by Ekman pumping.

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Section: Discussionmentioning

confidence: 99%

Deep‐Ocean Circulation in the Southwest Pacific Ocean Interior: Estimates of the Mean Flow and Variability Using Deep Argo Data

Zilberman

Roemmich

Gilson

2020

Geophysical Research Letters

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“…Steric height is depth‐integrated inverse density, resulting from expansion and contraction of the water column due to changes in temperature and salinity (Giglio et al., 2013). The heat and freshwater contents corresponding to the different water masses (AW, ArW, and BSW) are estimated by integrating temperature and salinity across the water mass‐specific depth ranges defined by in situ measurements.…”

Section: Introductionmentioning

confidence: 99%

Water Mass Properties Derived From Satellite Observations in the Barents Sea

2020

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The Barents Sea is a region of deep water formation where Atlantic Water is converted into cooler, fresher Barents Sea Water. Barents Sea Water properties exhibit variability at seasonal, interannual, and decadal timescales. This variability is transferred to Arctic Intermediate Water, which eventually contributes to the deeper branch of the Atlantic meridional overturning circulation. Variations in Barents Sea Water properties are reflected in steric height (contribution of density to sea‐level variations) that depends on heat and freshwater contents and is a quantity usually derived from in situ observations of water temperature, salinity, and pressure that remain sparse during winter in the Barents Sea. This analysis explores the utility of satellite observations for representing Barents Sea Water properties and identifying trends and sources of variability through novel methods. We present our methods for combining satellite observations of eustatic height (the contribution of mass to sea‐level variations), sea surface height, and sea surface temperature, validated by in situ temperature and salinity profiles, to estimate steric height. We show that sea surface temperature is a good proxy for heat content in the upper part of the water column in the southeastern Barents Sea and that freshwater content can be reconstructed from satellite data. Our analysis indicates that most of the seasonality in Barents Sea Water properties arises from the balance between ocean heat transport and atmospheric heat flux, while its interannual variability is driven by heat and freshwater advection.

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“…Despite of the urgent need for continuing measurements of high quality salinity data over the global ocean, their actual availability is about an order of magnitude less than the temperature data (Lorbacher et al 2006;Giglio et al 2013). Our basic knowledge about the global sea surface/subsurface salinity is derived from the World Ocean Atlas 2005, a careful compilation of most available in situ oceanographic data collected over time (Boyer et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Climatology and seasonality of upper ocean salinity: a three-dimensional view from argo floats

Chen

Peng

2017

Clim Dyn

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temperature, seasonal variability of salinity in the oceanic mixed layer has a clear tropical dominance. Meanwhile, it is found that a two-mode structure with annual and semiannual periodicities can effectively penetrate through the upper ocean into a depth of ~2000 m. Fourth, signature of Rossby waves is identified in the annual phase map of ocean salinity within 200-600 m depths in the tropical oceans, revealing a strongly co-varying nature of ocean temperature and salinity at specific depths. These results serve as significant contributions to improving our knowledge on the haline aspect of the ocean climate.

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Understanding the annual cycle in global steric height

Cited by 8 publications

References 22 publications

Deep‐Ocean Circulation in the Southwest Pacific Ocean Interior: Estimates of the Mean Flow and Variability Using Deep Argo Data

Deep‐Ocean Circulation in the Southwest Pacific Ocean Interior: Estimates of the Mean Flow and Variability Using Deep Argo Data

Water Mass Properties Derived From Satellite Observations in the Barents Sea

Climatology and seasonality of upper ocean salinity: a three-dimensional view from argo floats

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