Articles | Volume 15, issue 2
https://doi.org/10.5194/bg-15-507-2018
https://doi.org/10.5194/bg-15-507-2018
Research article
 | 
26 Jan 2018
Research article |  | 26 Jan 2018

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

Birgit Gaye, Anna Böll, Joachim Segschneider, Nicole Burdanowitz, Kay-Christian Emeis, Venkitasubramani Ramaswamy, Niko Lahajnar, Andreas Lückge, and Tim Rixen

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Cited articles

Agnihotri, R., Bhattacharya, S. K., Sarin, M. M., and Somayajulu, B. L. K.: Changes in surface productivity and subsurface denitrification during the Holocene: a multiproxy study from the eastern Arabian Sea, Holocene, 13, 701–713, 2003. 
Agnihotri, R., Kurian, S., Fernandes, M., Reshma, K., D'Souza, W., and Naqvi, S. W. A.: Variability of subsurface denitrification and surface productivity in the coastal eastern Arabian Sea over the past seven centuries, Holocene, 18, 755–764, 2008. 
Agnihotri, R., Naqvi, S. W. A., Kurian, S., Altabet, M. A., and Bratton, J. F.: Is delta N-15 of Sedimentary Organic Matter a Good Proxy for Paleodenitrification in Coastal Waters of the Eastern Arabian Sea?, in: Indian Ocean Biogeochemical Processes and Ecological Variability, edited by: Wiggert, J. D., Hood, R. R., Naqvi, S. W. A., Brink, K. H., and Smith, S. L., Geophysical Monograph Series, American Geophysical Union, Washington, 2009. 
Agnihotri, R., Mandal, T. K., Karapurkar, S. G., Naja, M., Gadi, R., Ahammmed, Y. N., Kumar, A., Saud, T., and Saxena, M.: Stable carbon and nitrogen isotopic composition of bulk aerosols over India and northern Indian Ocean, Atmos. Environ., 45, 2828–2835, 2011. 
Altabet, M. A.: Isotopic Tracers of the Marine Nitrogen Cycle: Present and Past, in: Marine Organic Matter: Biomarkers, Isotopes and DNA, The Handbook of Environmental Chemistry, vol. 2N, edited by: Volkman, J. K., Springer, Berlin, Heidelberg, https://link.springer.com/chapter/10.1007/698_2_008, 2006. 
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Short summary
The Arabian Sea has one of the most severe oxygen minima of the world's oceans between about 100 and 1200 m of water depth and is therefore a major oceanic nitrogen sink. Stable nitrogen isotopic ratios in sediments record changes in oxygen concentrations and were studied for the last 25 kyr. Oxygen concentrations dropped at the end of the last glacial and became further reduced during the Holocene, probably due to the increasing age of the low-oxygen water mass.
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