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| Whitby, Hannah; Hollibaugh, James T.; Van Den Berg, Constant M. G.. |
| The concentrations of dissolved copper (Cu-d), copper-binding ligands, thiourea-type thiols, and humic substances (HScu) were measured in estuarine waters adjacent to Sapelo Island, Georgia, USA, on a monthly basis from April to December 2014. Here we present the seasonal cycle of copper speciation within the estuary and compare it to the development of an annually occurring bloom of Ammonia Oxidizing Archaea (AOA), which require copper for many enzymes. Two types of complexing ligands (L-1 and L-2) were found to dominate with mean complex stabilities (log K'(cuL)) of 14.5 and 12.8. Strong complexation resulted in lowering the concentration of free cupric ion (Cu2+) to femtomolar (fM) levels throughout the study and to sub-fM levels during the summer... |
| Tipo: Text |
Palavras-chave: Copper speciation; Cathodic stripping voltammetry; Humic substances; Thiols; Thiourea; Organic ligands; Thaumarchaeota; Ammonia-oxidizing archaea. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00616/72834/72735.pdf |
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| Breitbarth, E.; Achterberg, E. P.; Ardelan, M. V.; Baker, A. R.; Bucciarelli, E.; Chever, F.; Croot, P. L.; Duggen, S.; Gledhill, M.; Hassellov, M.; Hassler, C.; Hoffmann, L. J.; Hunter, K. A.; Hutchins, D. A.; Ingri, J.; Jickells, T.; Lohan, M. C.; Nielsdottir, M. C.; Sarthou, G.; Schoemann, V.; Trapp, J. M.; Turner, D. R.; Ye, Y.. |
| Based on an international workshop (Gothenburg, 14-16 May 2008), this review article aims to combine interdisciplinary knowledge from coastal and open ocean research on iron biogeochemistry. The major scientific findings of the past decade are structured into sections on natural and artificial iron fertilization, iron inputs into coastal and estuarine systems, colloidal iron and organic matter, and biological processes. Potential effects of global climate change, particularly ocean acidification, on iron biogeochemistry are discussed. The findings are synthesized into recommendations for future research areas. |
| Tipo: Text |
Palavras-chave: Sub-arctic pacific; Dissolved organic carbon; Field flow fractionation; Phytoplankton community structure; Cathodic stripping voltammetry; Continuous culture system; Export experiment crozex; Eastern north atlantic; Light co-limitation; Southern ocean. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00205/31606/30034.pdf |
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