Geochemical evidence for Holocene paleoclimatic changes in Maxwell Bay of South Shetland Islands, West Antarctica

Kim, Dongseon; Park, Byong-Kwon; Yoon, Ho Il; Kang, Cheon Yun

doi:10.1007/bf02910235

Cited by 4 publications

(2 citation statements)

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“…The authors declare no conflicts of interest relevant to this study. Kim, 2018aKim, , 2018b. The meteorological observation data (surface temperature and surface wind) are publicly available at the KPDC website via https://dx.doi.org/doi:10.22663/KOPRI-KPDC-00002375.1 (Park et al, 2023).…”

Section: Appendix A: Variation Of Seawater Propertiesmentioning

confidence: 99%

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Kim,

Park

et al. 2023

JGR Oceans

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The Antarctic Peninsula is one region that has recently experienced warming substantially more rapidly than the global mean over the past 50 years. Marian Cove is located in the South Shetland Islands connected to the Bransfield Strait via Maxwell Bay between King George Island and Nelson Island. In this study, we identified properties and mechanisms of seawater exchange in Marian Cove from multiple hydrographic surveys and a single bottom‐mounted mooring installed at the entrance to Marian Cove. Regardless of the season, the mean current velocity profiles at the entrance to Marian Cove were constant because of the influence of tidal forcing. Wind was the primary force that determined the variation in surface current; in response, a countercurrent occurred near the bottom area. We estimated salt transport to understand what effects Maxwell Bay′s saline water intrusion has on the Marian Cove environment. When the daily easterly wind was at its maximum of 18.5 m s−1, the salinity could increase to 7.20 × 10−4 g kg−1 in 1 day. In addition, the average freshwater residence time in Marian Cove for the quantitative evaluation of seawater exchange was approximately 9 days. However, the freshwater residence time was reduced to less than 2 days when there were extreme easterly winds.

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Section: Appendix A: Variation Of Seawater Propertiesmentioning

confidence: 99%

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Kim,

Park

et al. 2023

JGR Oceans

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“…9. Comparison of vertical variation between total organic carbon (TOC) and biogenic silica (Bsi) (modifi ed from Kim et al 1999; printed with permission of Geosciences Journal). The strong positive relationship indicates a high biological productivity in the upper unit, largely composed of diatoms.…”

Section: Postglacial Marine Environmental Change In Maxwell Baymentioning

confidence: 99%

Postglacial marine environmental changes in Maxwell Bay, King George Island, West Antarctica

Khim

Yoon

2003

Polar Research

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Sediment textural properties and total organic carbon (TOC) contents of three sediment cores from Maxwell Bay, King George Island, West Antarctica, record changes in Holocene glaciomarine sedimentary environments. The lower sedimentary unit is mostly composed of TOC‐poor diamictons, indicating advanced coastal glacier margins and rapid iceberg discharge in proximal glaciomarine settings with limited productivity and meltwater supply. Fine‐grained, TOC‐rich sediments in the upper lithologic unit suggest more open water and warm conditions, leading to enhanced biological productivity due to increased nutrient‐rich meltwater supply into the bay. The relationship between TOC and total sulfur (TS) indicates that the additional sulfur within the sediment has not originated from in situ pyrite formation under the reducing condition, but rather may be attributed to the detrital supply of sand‐sized pyrite from the hydrothermal‐origin, quartz‐pyrite rocks widely distributed in King George Island. The evolution of bottom‐water hydrography after deglaciation was recorded in the benthic foraminiferal stable‐isotopic composition, corroborated by the TOC and lithologic changes. The Ø18O values indicate that bottom‐water in Maxwell Bay was probably mixed gradually with intruding 18O‐rich seawater from Bransfield Strait. In addition, the Ø13C values reflect a spatial variability in the carbon isotope distribution in Maxwell Bay, depending on marine productivity as well as terrestrial carbon fluxes by meltwater discharge. The distinct lithologic transition, dated to approximately 8000 yr BP (uncorrected) and characterized by textural and geochemical contrasts, highlights the postglacial environmental change by a major coastal glacier retreat in Maxwell Bay.

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Antarctic palaeo-ice streams

Livingstone

Cofaigh

Stokes

et al. 2012

Earth-Science Reviews

180

183

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We review the geomorphological, sedimentological and chronological evidence for palaeo- palaeo-ice streams to be classified into discrete retreat styles and the controls on grounding-21 line retreat to be investigated. Such analysis highlights the important impact of internal 22 factors on ice stream dynamics, such as bed characteristics and slope, and drainage basin size. 23Whilst grounding-line retreat may be triggered, and to some extent paced, by external 24 (atmospheric and oceanic) forcing, the individual characteristics of each ice stream will 25 modulate the precise timing and rate of retreat through time. ). The ability to directly observe the beds of palaeo-ice streams has also allowed 65 scientists to glean important spatial and temporal information on the processes that occurred 66 at the ice-bed interface and on the evolution of palaeo-ice streams throughout their glacial 67 history. 68Over the last two decades, there has been a burgeoning interest in marine palaeo-ice streams, and the timing and rate of deglaciation (e.g. Wellner et al. 2001;Canals et al., 2000; Lowe & 73 Anderson, 2002;Ó Cofaigh et al. 2002;Graham et al. 2009 115The first glacimarine investigations in Antarctica utilised echosounder data, till petrographic 116 studies and seismic data to reconstruct the expansion of grounded ice across the continental 117 shelf during the last glaciation (e.g. Kellogg et al. 1979; Anderson et al. 1980; Orheim & 118 Elverhøi, 1981;Domack, 1982;Haase, 1986;Kennedy & Anderson, 1989 Pudsey et al. 1994;Larter & Vanneste, 1995;O'Brien et al. 1999;Shipp et al. 1999; Canals 123 et al. 2000 Canals 123 et al. , 2002 Canals 123 et al. , 2003Anderson & Shipp, 2001;Wellner et al. 2001;Ó Cofaigh et al. 2002 Ó Cofaigh et al. , 124 2003 Ó Cofaigh et al. , 2005a Lowe & Anderson, 2003; Dowdeswell et al. 2004a,b;Evans et al. 2004Evans et al. , 2005 recently been demonstrated (Padman et al., 2010). 132In O'Brien et al. 1999O'Brien et al. , 2007 Table 2 provides a synthesis of the key physiographic data of each palaeo-ice stream in our 215 new inventory (see Fig. 1 and (ten Brink & Schneider, 1995). 228It is also apparent from 248The majority of the Antarctic palaeo-ice streams retreated across reverse slopes ( 2010) is suggested to relate to the much smaller size of its drainage basin (10,000-100,000 269 km 2 ), which is likely to have been much more sensitive to external and internal forcing. East Antarctic Peninsula, has also been associated with a change in basal processes (from 327 9 basal sliding to deformation) and an increase in ice velocity (Reinardy et al. 2011b The geometry of the basal reflector underlying the acoustically transparent unit ranges from 363 smooth and flat to irregular and undulating ( shelf (Pudsey et al. 1994Licht et al. 1996Licht et al. , 1998Licht et al. , 1999 between this bedrock and unconsolidated sediment further out on the shelf (Fig. 4c and Table 493 3) (Anderson et al. 2001; Camerlenghi et al. 2001;Wellner et al. 2001Wellner et al. , 2006...

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Geochemical evidence for Holocene paleoclimatic changes in Maxwell Bay of South Shetland Islands, West Antarctica

Cited by 4 publications

References 35 publications

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Properties and Mechanisms of Seawater Exchange in Marian Cove, King George Island, West Antarctic Peninsula

Postglacial marine environmental changes in Maxwell Bay, King George Island, West Antarctica

Antarctic palaeo-ice streams

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