Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarcti

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Antarctic Science
Volume 25 Issue 3
Use of radium isotopes to estimate mixing rates and...
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Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula
Part of:
Antarctic Science International Bursary collection: Geosciences
Published online by Cambridge University Press:
29 October 2012
Amber L. Annett
Sian F. Henley
Pieter Van Beek
Marc Souhaut
Raja Ganeshram
Hugh J. Venables
Michael P. Meredith
and
Walter Geibert
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Amber L. Annett*
Affiliation:
School of GeoSciences, University of Edinburgh, EdinburghEH9 3JW, UK
Sian F. Henley
Affiliation:
School of GeoSciences, University of Edinburgh, EdinburghEH9 3JW, UK
Pieter Van Beek
Affiliation:
Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales (CNRS/UPS/IRD/CNES), Observatoire Midi Pyrénées, Toulouse, France
Marc Souhaut
Affiliation:
Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales (CNRS/UPS/IRD/CNES), Observatoire Midi Pyrénées, Toulouse, France
Raja Ganeshram
Affiliation:
School of GeoSciences, University of Edinburgh, EdinburghEH9 3JW, UK
Hugh J. Venables
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Michael P. Meredith
Affiliation:
British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
Walter Geibert
Affiliation:
School of GeoSciences, University of Edinburgh, EdinburghEH9 3JW, UK
Scottish Association for Marine Science (SAMS), Scottish Marine Institute, Oban, UK
amber.annett@ed.ac.uk
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Abstract
In the western Antarctic Peninsula region, micronutrient injection facilitates strong plankton blooms that support productive food webs, unlike large areas of the low-productivity Southern Ocean. We use naturally occurring radioisotopes of radium to constrain rates of chemical fluxes into Ryder Bay (a small coastal embayment in northern Marguerite Bay), and hence to evaluate possible sources of sediment-derived micronutrients and estimate sediment-ocean mixing rates. We present the first coupled, short-lived radium isotope (
223
Ra and
224
Ra) measurements from Antarctic waters, both present at very low activities (mean 0.155 and 3.21 dpm m
-3
, respectively), indicating much lower radium inputs than in other coastal environments. Longer-lived
228
Ra activity was also lower than existing nearshore values, but higher than open ocean waters, indicating some degree of coastal radium input on timescales exceeding the week-to-month range reflected by
223
Ra and
224
Ra. Using a simple diffusion model along a shore to mid-bay transect, effective horizontal eddy diffusivity estimates ranged from 0.22–0.83 m
-1
from
223
Ra and
224
Ra, respectively, much lower than already-low mixing estimates for the Southern Ocean. Significant radium enrichment and much faster mixing (18 m
-1
) was found near a marine-terminating glacier and consequently any sediment-derived micronutrient inputs in this location are more probably dominated by glacial processes than groundwater, land runoff, or marine sediment sources.
Keywords
actinium-227
glacial inputs
horizontal eddy diffusivity
land-ocean interface
Radium Delayed Coincidence Counter (RaDeCC)
Ryder Bay
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Type
Physical Sciences
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Antarctic Science
Volume 25
Issue 3
, June 2013
, pp. 445 - 456
DOI:
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Copyright © Antarctic Science Ltd 2012
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Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula
Volume 25,
Issue 3
Amber L. Annett
(a1)
Sian F. Henley
(a1)
Pieter Van Beek
(a2)
Marc Souhaut
(a2)
Raja Ganeshram
(a1)
Hugh J. Venables
(a3)
Michael P. Meredith
(a3)
and
Walter Geibert
(a1)
(a4)
DOI:
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Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula
Volume 25,
Issue 3
Amber L. Annett
(a1)
Sian F. Henley
(a1)
Pieter Van Beek
(a2)
Marc Souhaut
(a2)
Raja Ganeshram
(a1)
Hugh J. Venables
(a3)
Michael P. Meredith
(a3)
and
Walter Geibert
(a1)
(a4)
DOI:
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Use of radium isotopes to estimate mixing rates and trace sediment inputs to surface waters in northern Marguerite Bay, Antarctic Peninsula
Volume 25,
Issue 3
Amber L. Annett
(a1)
Sian F. Henley
(a1)
Pieter Van Beek
(a2)
Marc Souhaut
(a2)
Raja Ganeshram
(a1)
Hugh J. Venables
(a3)
Michael P. Meredith
(a3)
and
Walter Geibert
(a1)
(a4)
DOI:
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