Recent increases in water column denitrification in the seasonally suboxic bottom waters of the Santa Barbara Basin
White, Margot E.
Stephens, Brandon M.
Wankel, Scott D.
Aluwihare, Lihini I.
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Denitrification in the anoxic sediments of the Santa Barbara Basin has been well documented in the historic and modern record, but the regulation of and frequency with which denitrification occurs in the overlying water column are less understood. Since 2004, the magnitude and speciation of redox active nitrogen species in bottom waters have changed markedly. Most notable are periods of decreased nitrate and increased nitrite concentrations. Here we examine these changes in nitrogen cycling as recorded by the stable isotopes of dissolved nitrate from 2010–2016. When compared to previous studies, our data identify an increase in water column denitrification in the bottom waters of the basin. Observations from inside the basin as well as data from the wider California Current Ecosystem implicate a long‐term trend of decreasing oxygen concentrations as the driver for these observed changes, with ramifications for local benthic communities and regional nitrogen loss.
Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 46(12), (2019): 6786-6795, doi:10.1029/2019GL082075.
Suggested CitationWhite, M. E., Rafter, P. A., Stephens, B. M., Wankel, S. D., & Aluwihare, L. I. (2019). Recent increases in water column denitrification in the seasonally suboxic bottom waters of the Santa Barbara Basin. Geophysical Research Letters, 46(12), 6786-6795.
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