Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Float Data Archive

Johnson, Kenneth S.; Riser, Stephen C.; Boss, Emmanuel; Talley, Lynne D.; Sarmiento, Jorge L.; Swift, Dana D.; Plant, Joshua N.; Maurer, Tanya L.; Key, Robert M.; Williams, Nancy L.; Wanninkhof, Richard H; Dickson, Andrew G.; Feely, Richard A.; Russell, J. L.

doi:10.6075/j0tx3c9x

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AWI hydrographic mooring datasets can be retrieved fromFahrbach and Rohardt (2013a) andFahrbach and Rohardt (2013b). Measurements from two profiling floats were downloaded from the SOCCOM quality-controlled archive(Johnson et al, 2017): https://doi.org/10.6075/J0TX3C9X. Finally, seafloor topography ETOPO(Amante & Eakins, 2009) is freely available from https://www.ngdc.noaa.gov/ mgg/global/relief/ETOPO1/data/.…”

mentioning

confidence: 99%

Early Winter Triggering of the Maud Rise Polynya

Zhou

Heuzé

Mohrmann

2022

Geophysical Research Letters

View full text Add to dashboard Cite

What triggers Maud Rise polynya, a large opening in the winter Antarctic sea ice, is still debated. We show that the upcoming opening of all Maud Rise polynyas can be detected in early winter up to four months ahead, especially since the 2002 expansion in satellite observations. In all polynya years, continuous anomalous sea ice thinning begins in May, caused by atmospheric and oceanic forcings. Dynamically, an anomalous cyclonic circulation in the atmosphere and the ocean strengthens the Weddell Gyre and exerts anomalously intense stresses on the ice. Thermodynamically, the warm water advected by the intensified circulation, and most importantly entrained into the mixed layer, thins the ice from below at the beginning of the freezing season, preconditioning the region for a polynya event months later. This four‐month‐ahead pattern enables early predictions of the polynya, and improved expedition planning and sensor deployment.

show abstract

mentioning

confidence: 99%

Early Winter Triggering of the Maud Rise Polynya

Zhou

Heuzé

Mohrmann

2022

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…Together, the complex regional responses due to hydrographic complexity (e.g., in Stendardo & Gruber, 2012) and low sampling density (Figures S1a and S1b in Supporting Information S1) of these large basins hamper empirical estimation and attribution of links between variable surface nutrient drawdown and subsurface O 2 . The advent of autonomous platforms and models that assimilate biogeochemical tracers (Johnson et al, 2017) may enable the analyses undertaken here to be applied in other historically under-sampled regions.…”

Section: Discussionmentioning

confidence: 99%

Climatic Changes in North Atlantic O₂ Amplified by Temperature Sensitivity of Phytoplankton Growth

Margolskee,

Ito,

Long

et al. 2023

Global Biogeochemical Cycles

View full text Add to dashboard Cite

Ocean warming is associated with a decline in the global oxygen (O2) inventory, but the ratio of O2 loss to heat gain is poorly understood. We analyzed historical variability in temperature (T), O2, and nitrate in hydrographic observations and model simulations of the North Atlantic, a relatively well‐sampled region that is important for deep ocean ventilation. Multidecadal fluctuations of O2 concentrations in subpolar thermocline waters (100–700 m) are correlated with changes in their heat content, with a slope 35% steeper than that expected from thermal solubility. Variations of O2 in excess of the solubility effect are correlated with observed decadal changes in in the surface layer (0–50 m), which declines by ∼1 mmol N m−3 per degree of temperature anomaly. Enhanced biologically mediated drawdown of nutrients from the photic zone and associated respiration in deeper water account for the additional depletion of thermocline O2 during warm years. In model simulations, increased nutrient consumption in warm periods is driven by an early start of the phytoplankton growing season and faster phytoplankton growth rates at higher temperatures. Our results highlight a role for phytoplankton T‐dependent growth rates in amplifying ocean O2 loss.

show abstract

Sea Ice Production in the 2016 and 2017 Maud Rise Polynyas

2023

View full text Add to dashboard Cite

Polynyas are regions of low sea ice concentration (SIC) or thickness where the comparatively warm ocean is exposed to the cold atmosphere. Coastal polynyas are mainly driven by katabatic winds, while sensible heat convection results in open-ocean/offshore polynyas (Morales Maqueda et al., 2004). Morales Maqueda et al. ( 2004) (and references therein) summarized that air-ice-ocean interactions in polynyas could impact: (a) the moisture and heat exchange between atmosphere and ocean and, therefore, the local wind dynamics; (b) the upper ocean properties and vertical flows of dense saline water through brine rejection and buoyancy loss; (c) the biogeochemical fluxes, for example, acting as the sinks of atmospheric CO 2 , between air and sea; and (d) the local ecosystems with extra phytoplankton and zooplankton, serving as "oases" in a polar ocean desert. In the Southern Ocean, open-ocean polynyas rarely occur but can reach a large extent. Such an open-ocean polynya, the Maud Rise polynya, opened in the vicinity of the Maud Rise seamount (centered on 64°S and 3°E)

show abstract

Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Float Data Archive

Cited by 3 publications

References 0 publications

Early Winter Triggering of the Maud Rise Polynya

Early Winter Triggering of the Maud Rise Polynya

Climatic Changes in North Atlantic O₂ Amplified by Temperature Sensitivity of Phytoplankton Growth

Sea Ice Production in the 2016 and 2017 Maud Rise Polynyas

Contact Info

Product

Resources

About

Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) Float Data Archive

Cited by 3 publications

References 0 publications

Early Winter Triggering of the Maud Rise Polynya

Early Winter Triggering of the Maud Rise Polynya

Climatic Changes in North Atlantic O2 Amplified by Temperature Sensitivity of Phytoplankton Growth

Sea Ice Production in the 2016 and 2017 Maud Rise Polynyas

Contact Info

Product

Resources

About

Climatic Changes in North Atlantic O₂ Amplified by Temperature Sensitivity of Phytoplankton Growth