Climatology and decadal variability of the Ross Sea shelf waters

Russo, Aniello; Bergamasco, A.; Carniel, Sandro; Grieco, L.; Sclavo, Mauro; Spezie, G.

doi:10.1080/19475721.2011.575179

Cited by 5 publications

(4 citation statements)

References 42 publications

(55 reference statements)

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“…Changes in the global abyssal waters [ Purkey and Johnson , ] as well as observations of the changing stratification on the continental shelf of Antarctica associated with increased glacial melt [ Jacobs and Giulivi , ; Russo et al ., ; Rignot et al ., ; Schmidtko et al ., ] have led to speculations as to how the formation rate and properties of AABW respond to global climate change [ Stewart and Thompson , , ]. To relate changes in AABW formation to climate change forcing requires time series that resolve the seasonal cycle, which is large in comparison to the longer‐term trends in many locations, for example, within the Weddell Sea [ Gordon et al ., ] and the Ross Sea [ Bergamasco et al ., , ; Gordon et al ., 2004, ; Budillon et al ., ].…”

Section: Introductionmentioning

confidence: 98%

Bottom water export from the western Ross Sea, 2007 through 2010

Gordon

Huber

Busecke

2015

Geophysical Research Letters

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Bottom water export from the Ross Sea, February 2007 to January 2011, exhibits seasonal and interannual variability. Temperature minima coupled to salinity maxima in late austral summer, into the fall, indicate input from High‐Salinity Shelf Water (HSSW). Secondary temperature minima lacking the high‐salinity trait, characteristic of Low‐Salinity Shelf Water (LSSW), appear in the spring. Warmer bottom water similar to modified Circumpolar Deep Water (mCDW) is observed in winter and in early summer. The LSSW and mCDW may be drawn from the Drygalski Basin, as the HSSW pool retreats poleward from the shelf break in response to increased winter polar easterlies allowing these less dense overlying waters to spill into the deep ocean within the benthic layer. Bottom salinity decreased from 2007 to 2011 by 0.007 year−1 significantly higher than regional decadal trends, which we propose is a result of HSSW retreat induced by strengthening polar easterlies.

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Section: Introductionmentioning

confidence: 98%

Bottom water export from the western Ross Sea, 2007 through 2010

Gordon

Huber

Busecke

2015

Geophysical Research Letters

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“…It is also noted that the layer of CDW north of the shelf is slightly thicker (higher in the water column) than in the summer composite (and its temperature higher; not shown). Preliminary investigations also indicate that TNBP bottom waters observed during PIPERS were fresher compared to long-term TNBP mooring observations (Russo and others, 2011), and are suggestive of a freshening rate of ∼0.02 decade −1 . Jacobs and Giulivi (2010) similarly reported a SW freshening rate of 0.03 decade −1 over 1958 to 2008 for the southwestern Ross Sea.…”

Section: Regional Ocean Conditionsmentioning

confidence: 64%

Sea-ice production and air/ice/ocean/biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign

et al. 2020

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The Ross Sea is known for showing the greatest sea-ice increase, as observed globally, particularly from 1979 to 2015. However, corresponding changes in sea-ice thickness and production in the Ross Sea are not known, nor how these changes have impacted water masses, carbon fluxes, biogeochemical processes and availability of micronutrients. The PIPERS project sought to address these questions during an autumn ship campaign in 2017 and two spring airborne campaigns in 2016 and 2017. PIPERS used a multidisciplinary approach of manned and autonomous platforms to study the coupled air/ice/ocean/biogeochemical interactions during autumn and related those to spring conditions. Unexpectedly, the Ross Sea experienced record low sea ice in spring 2016 and autumn 2017. The delayed ice advance in 2017 contributed to (1) increased ice production and export in coastal polynyas, (2) thinner snow and ice cover in the central pack, (3) lower sea-ice Chl-a burdens and differences in sympagic communities, (4) sustained ocean heat flux delaying ice thickening and (5) a melting, anomalously southward ice edge persisting into winter. Despite these impacts, airborne observations in spring 2017 suggest that winter ice production over the continental shelf was likely not anomalous.

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“…Only a limited number of climatologies have been constructed specifically for shelf areas, e.g. for the eastern seaboard of North America (Atkinson et al, 1983;Blanton et al, 2003;Bisagni, 2016;Richaud et al, 2016) and the Ross Sea off Antarctica (Russo et al, 2011). Most climatologies of key ocean variables exclude data from "land grid-boxes", i.e.…”

Section: Introductionmentioning

confidence: 99%

Temperature, Salinity and Oxygen Climatology of African Continental Shelf Water, South of the Equator, and Changes Since 1945

Villiers¹

2021

Preprint

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The first temperature, salinity and oxygen climatologies for waters of the continuous southern African continental shelf is presented. It is based on oceanographic data collected since 1945, sub-sampled at depths of 5, 50 and 100 m on a mixed-spatial grid with 0.25° to 0.5° resolution. The climatologies capture spatial heterogeneities and seasonal variability in key ocean variables for the southern African shelf in unique detail. The results correspond relatively well with biogeographic boundaries informed by classification schemes grounded in taxonomy, but questions the value of the Large Marine Ecosystem approach. Analysis of decadal trends demonstrates the inherent complexity and spatial heterogeneity associated with environmental variability, and suggest the possibility that decadal periodicities are in the process of being disrupted by a longer-term trend. The overall pattern is that southern African West and South coast shelf waters are becoming warmer, except for some upwelling areas, where cooling is evident. Benguela and Agulhas Bank shelf water are also becoming more oxygen depleted.

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Climatology and decadal variability of the Ross Sea shelf waters

Cited by 5 publications

References 42 publications

Bottom water export from the western Ross Sea, 2007 through 2010

Bottom water export from the western Ross Sea, 2007 through 2010

Sea-ice production and air/ice/ocean/biogeochemistry interactions in the Ross Sea during the PIPERS 2017 autumn field campaign

Temperature, Salinity and Oxygen Climatology of African Continental Shelf Water, South of the Equator, and Changes Since 1945

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