Open Access
Rebound of shelf water salinity in the Ross Sea
Pasquale Castagno,Vincenzo Capozzi,Giacomo R. DiTullio,Pierpaolo Falco,Giannetta Fusco,Stephen R. Rintoul,Giancarlo Spezie,Giorgio Budillon +7 more
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TLDR
Near-synchronous interannual fluctuations in salinity observed at five locations on the continental shelf suggest that upstream preconditioning and large-scale forcing influence HSSW salinity, which decreased between 1995 and 2014 and rebounded sharply after 2014.Abstract:
Antarctic Bottom Water (AABW) supplies the lower limb of the global overturning circulation and ventilates the abyssal ocean. In recent decades, AABW has warmed, freshened and reduced in volume. Ross Sea Bottom Water (RSBW), the second largest source of AABW, has experienced the largest freshening. Here we use 23 years of summer measurements to document temporal variability in the salinity of the Ross Sea High Salinity Shelf Water (HSSW), a precursor to RSBW. HSSW salinity decreased between 1995 and 2014, consistent with freshening observed between 1958 and 2008. However, HSSW salinity rebounded sharply after 2014, with values in 2018 similar to those observed in the mid-late 1990s. Near-synchronous interannual fluctuations in salinity observed at five locations on the continental shelf suggest that upstream preconditioning and large-scale forcing influence HSSW salinity. The rate, magnitude and duration of the recent salinity increase are unusual in the context of the (sparse) observational record. Ross Sea Bottom Water, a major source of Antarctic Bottom Water, has experienced significant freshening in recent decades. Here the authors use 23 years of summer measurements to document temporal variability in the salinity of the Ross Sea High Salinity Shelf Water (HSSW) and found that HSSW salinity decreased between 1995 and 2014 and rebounded sharply after 2014.read more
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State of the Climate in 2019
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TL;DR: In this paper, the authors propose a method to solve the problem of homonymity in the context of homonyms.........................................................................................................Siii Siii S iii Siii.
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Interannual variations in meltwater input to the Southern Ocean from Antarctic ice shelves
TL;DR: For the four largest ‘cold-water’ ice shelves, meltwater fluxes are partitioned into deep and shallow sources to reveal distinct signatures of temporal variability, providing insights into climate forcing of basal melting and the impact of this melting on the Southern Ocean.
Journal ArticleDOI
Recent recovery of Antarctic Bottom Water formation in the Ross Sea driven by climate anomalies
Alessandro Silvano,Alessandro Silvano,Annie Foppert,Annie Foppert,Stephen R. Rintoul,Stephen R. Rintoul,Paul R. Holland,Takeshi Tamura,Takeshi Tamura,Noriaki Kimura,Pasquale Castagno,Pierpaolo Falco,Giorgio Budillon,F. Alexander Haumann,F. Alexander Haumann,Alberto C. Naveira Garabato,Alison M. Macdonald +16 more
TL;DR: In this paper, the authors used in situ observations to document a recovery in the salinity, density and thickness (that is, depth range) of AABW formed in the Ross Sea, with properties in 2018-2019 similar to those observed in the 1990s.
Journal ArticleDOI
Ocean mixing and heat transport processes observed under the Ross Ice Shelf control its basal melting.
Craig Stevens,Christina L. Hulbe,Mike Brewer,Craig L Stewart,Natalie Robinson,Christian Ohneiser,Stefan Jendersie +6 more
TL;DR: Direct measurements of the ocean beneath the center of the Ross Ice Shelf are described to provide evidence of the changing water column structure in the cavity beneath the Ross ice shelf, the planet’s largest ice shelf by area.
Temporal variability of the Circumpolar Deep Water inflow onto the Ross Sea continental shelf
TL;DR: In this article, the authors used hydrographic observations and a mooring placed on the outer shelf in the middle of the Drygalski Trough in order to characterize the spatial and temporal variability of CDW inflow onto the shelf.
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