World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Fate of Colloids During Estuarine Mixing in the Arctic : Volume 10, Issue 1 (24/02/2014)

By Pokrovsky, O. S.

Click here to view

Book Id: WPLBN0004020175
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Fate of Colloids During Estuarine Mixing in the Arctic : Volume 10, Issue 1 (24/02/2014)  
Author: Pokrovsky, O. S.
Volume: Vol. 10, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Causserand, C., Shirokova, L. S., Vorobieva, T. Y., Chupakov, A. V., Candaudap, F., Shevchenko, V. P.,...Zouiten, C. (2014). Fate of Colloids During Estuarine Mixing in the Arctic : Volume 10, Issue 1 (24/02/2014). Retrieved from http://netlibrary.net/


Description
Description: Georesources and Environment Toulouse GET, UMR5563, CNRS, Université Paul Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France. The estuarine behavior of organic carbon (OC) and trace elements (TE) was studied for the largest European sub-Arctic river, which is the Severnaya Dvina; this river has a deltaic estuary covered in ice during several hydrological seasons: summer (July 2010, 2012) and winter (March 2009) baseflow, and the November–December 2011 ice-free period. Colloidal forms of OC and TE were assessed for three pore size cutoffs (1, 10, and 50 kDa) using an in situ dialysis procedure. Conventionally dissolved (< 0.22 μm) fractions demonstrated clear conservative behavior for Li, B, Na, Mg, K, Ca, Sr, Mo, Rb, Cs, and U during the mixing of freshwater with the White Sea; a significant (up to a factor of 10) concentration increase occurs with increases in salinity. Si and OC also displayed conservative behavior but with a pronounced decrease in concentration seawards. Rather conservative behavior, but with much smaller changes in concentration (variation within ±30%) over a full range of salinities, was observed for Ti, Ni, Cr, As, Co, Cu, Ga, Y, and heavy REE. Strong non-conservative behavior with coagulation/removal at low salinities (< 5‰) was exhibited by Fe, Al, Zr, Hf, and light REE. Finally, certain divalent metals exhibited non-conservative behavior with a concentration gain at low (~ 2–5‰, Ba, Mn) or intermediate (~ 10–15‰, Ba, Zn, Pb, Cd) salinities, which is most likely linked to TE desorption from suspended matter or sediment outflux.

The most important result of this study is the elucidation of the behavior of the truly dissolved low molecular weight LMW< 1 kDa fraction containing Fe, OC, and a number of insoluble elements. The concentration of the LMW fraction either remains constant or increases its relative contribution to the overall dissolved (< 0.22 μm) pool as the salinity increases. Similarly, the relative proportion of colloidal (1 kDa–0.22 μm) pool for the OC and insoluble TE bound to ferric colloids systematically decreased seaward, with the largest decrease occurring at low (< 5‰) salinities.

Overall, the observed decrease in the colloidal fraction may be related to the coagulation of organo-ferric colloids at the beginning of the mixing zone and therefore the replacement of the HMW1 kDa–0.22 μm portion by the LMW< 1 kDa fraction. These patterns are highly reproducible across different sampling seasons, suggesting significant enrichment of the mixing zone by the most labile (and potentially bioavailable) fraction of the OC, Fe and insoluble TE. The size fractionation of the colloidal material during estuarine mixing reflects a number of inorganic and biological processes, the relative contribution of which to element speciation varies depending on the hydrological stage and time of year. In particular, LMW< 1 kDa ligand production in the surface horizons of the mixing zone may be linked to heterotrophic mineralization of allochthonous DOM and/or photodestruction. Given the relatively low concentration of particulate versus dissolved load of most trace elements, desorption from the river suspended material was less pronounced than in other rivers in the world. As a result, the majority of dissolved components exhibited either conservative (OC and related elements such as divalent metals) or non-conservative, coagulation-controlled (Fe, Al, and insoluble TE associated with organo-ferric colloids) behavior. The climate warming at high latitudes is likely to intensify the production of LMW< 1 kDa organic ligands and the associated TE; therefore, the delivery of potentially bioavailable trace metal micron


Summary
Fate of colloids during estuarine mixing in the Arctic

Excerpt
Alfaro-De la Torre, M. C., Beaulieu, P. Y., and Tessier, A. T.: In situ measurement of trace metals in lakewater using the dialysis and DGT techniques, Anal. Chim. Acta, 418, 53–68, 2000.; Allard, T., Menguy, N., Salomon, J., Calligaro, T., Weber, T., Calas, G., and Benedetti, M. F.: Revealing forms of iron in river-borne material from major tropical rivers of the Amazon Basin (Brazil), Geochim. Cosmochim. Ac., 68, 3079–3094, 2004.; Amon, R. M. W. and Benner, R.: Photochemical and microbial consumption of dissolved organic carbon and dissolved oxygen in the Amazon River System, Geochim. Cosmochim. Ac., 60, 1783–1792, 1996.; Amon, R. M. W., Rinehart, A. J., Duan, S., Louchouarn, P., Prokushkin, A., Guggenberger, G., Bauch, D., Stedmon, C., Raymond, P. A., Holmes, R. M., McClelland, J. W., Peterson, B. J., Walker, S. A., and Zhulidov, A. V.: Dissolved organic matter sources in large Arctic rivers, Geochim. Cosmochim. Ac., 94, 217–237, 2012.; Andersson, P. S., Porcelli, D., Wasserburg, G. J., and Ingri, J.: Particle transport of 234U/238U in the Kalix river and in the Baltic Sea, Geochim. Cosmochim. Ac. 62, 385–392, 1998.; Andersson, P. S., Porcelli, D., Gustafsson, O., Ingri, J., and Wasserburg, G. J.: The importance of colloids for the behavior of uranium isotopes in the low-salinity zone of a stable estuary, Geochim. Cosmochim. Ac., 65, 13–25, 2001.; Anesio, A. M. and Graneli, W.: Photochemical mineralization of dissolved organic carbon in lakes of different pH and humic content, Archiv für Hydrobiologie, 160, 105–116, 2004.; Artemyev, V. E. and Romankevich, E. A.: Seasonal variations in the transport of organic matter in North Dvina Estuary, Mitt. Geol.-Paläont. Inst. Univ. Hamburg, SCOPE/UNEP Sonderband Heft, 66, 177–184, 1988.; Ask, J., Karlsson, J., Persson, L., Ask, P., Byström, P., and Jansson, M.: Whole-lake estimates of carbon flux through algae and bacteria in benthic and pelagic habitats of clear-water lakes, Ecology, 90, 1923–1932, 2008.; Åström, M. E., Österholm, P., Gustafsson, J. P., Nystrand, M., Peltola, P., Nordmyr, L., and Boman, A.: Attenuation of rare earth elements in a boreal estuary, Geochim. Cosmochim. Ac., 96, 105–119, 2012.; Audry, S., Blanc, G., Schäfer, J., Chaillou, G., and Robert, S.: Early diagenesis of trace metals (Cd, Cu, Co, Ni, U, Mo, and V) in the freshwater reaches of a macrotidal estuary, Geochim. Cosmochim. Ac., 70, 2264–2282, 2006.; Audry, S., Blanc, G., Schäfer, J., and Robert, S.: Effect of estuarine sediment resuspension on early diagenesis, sulfide oxidation and dissolved molebdenum and uranium distribution in the Gironde estuary, France, Chem. Geol., 238, 149–167, 2007.; Bagard, M. L., Chabaux, F., Pokrovsky, O. S., Prokushkin, A. S., Viers, J., Dupré, B., and Stille, P.: Seasonal variability of element fluxes in two Central Siberian rivers draining high latitude permafrost dominated areas, Geochim. Cosmochim. Ac., 75, 3335–3357, 2011.; Barbeau, K., Rue, E., Bruland, K., and Butler, A.: Photochemical cycling of iron in the surface ocean mediated by microbial iron (III)-binding ligands, Nature, 413, 409–413, 2001.; Bau, M.: Scavenging of dissolved yttrium and rare earths by precipitating iron oxyhydroxide: Experimental evidence for Ce oxidation, Y-Ho fractionation, and lanthanide tetrad effect, Geochim. Cosmochim. Ac., 63, 67–77, 1999.; Beck, M., Dellwig, O., Fischer, S., Schnetger, B., and Brumsack, H.-J.: Trace metal geochemistry of organic-rich watercourses draining the NW German coast, Estuar. Coast. Shelf S., 104–105, 66–79, 2012.; Benoit, G., Oktay-Marshall, S. D., Cantu II, A., Hood, E. M., Coleman, C. H., Corapcioglu, M. O., and Santschi, P. H.: Partitioning of Cu, Pb, Ag, Zn, Fe, Al, and Mn between filter-retained particles, colloids, and solution in six Texas estuaries, Mar. Chem., 45, 307–336, 1994.; Bertilsson, S. and Tranvik, L. J.: Photochemical transformation of dissolved organic matter in lakes, Limnol. Oceanogr., 45, 75

 

Click To View

Additional Books


  • Interannual Correlations Between Sea Sur... (by )
  • Interannual Variability and Future Proje... (by )
  • Technical Note: Watershed Strategy for O... (by )
  • A New Parameterisation of Salinity Advec... (by )
  • A New 3-d Modelling Method to Extract Su... (by )
  • Operational Evaluation of the Mediterran... (by )
  • Structure of Phytoplankton (Continuous P... (by )
  • A Fishery Observing System for the Colle... (by )
  • Variability of Antarctic Intermediate Wa... (by )
  • Eddy Characteristics in the South Indian... (by )
  • The Role of Subpolar Deep Water Formatio... (by )
  • First Images and Orientation of Fine Str... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.