GSTDTAP  > 气候变化
DOI10.1029/2019GL082075
Recent Increases in Water Column Denitrification in the Seasonally Suboxic Bottom Waters of the Santa Barbara Basin
White, Margot E.1; Rafter, Patrick A.2; Stephens, Brandon M.3,4; Wankel, Scott D.5; Aluwihare, Lihini I.1
2019-06-28
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
EISSN1944-8007
出版年2019
卷号46期号:12页码:6786-6795
文章类型Article
语种英语
国家USA
英文摘要

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.


Plain Language Summary The current chemical environment of the deep Santa Barbara Basin is unprecedented in the 30 years since measurements began, suggesting that a regional change in ocean chemistry has occurred over this time period. Here we use stable isotope measurements of nitrate to examine how the nitrogen cycle in the deep part of the basin has changed, documenting a recent increase in the amount of nitrate being removed from the water column at this location. Nitrogen removal in the dark ocean, known as denitrification, occurs when microbes utilize nitrate for respiration in the absence of oxygen. Such a process is consistent with the extremely low or absent oxygen concentrations that accompany the altered nitrate isotope signatures we measured in this study. Denitrification in sediments is common in the Santa Barbara Basin, but extensive water column denitrification has not been previously documented. Loss of nitrate from the water column can have important consequences for the balance of nutrients that support primary production in the ocean. These changes appear to be an effect of decreasing oxygen concentrations observed on a regional scale in the North Pacific Ocean, a trend which is likely to continue as the oceans warm.


领域气候变化
收录类别SCI-E
WOS记录号WOS:000477616300069
WOS关键词TROPICAL SOUTH-PACIFIC ; OXYGEN-ISOTOPE FRACTIONATION ; ARABIAN SEA ; FRESH-WATER ; NITROGEN ; NITRATE ; NITRITE ; NITRIFICATION ; SEAWATER ; PERU
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/184268
专题气候变化
作者单位1.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA;
2.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA;
3.Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA;
4.Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA;
5.Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA
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GB/T 7714
White, Margot E.,Rafter, Patrick A.,Stephens, Brandon M.,et al. Recent Increases in Water Column Denitrification in the Seasonally Suboxic Bottom Waters of the Santa Barbara Basin[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6786-6795.
APA White, Margot E.,Rafter, Patrick A.,Stephens, Brandon M.,Wankel, Scott D.,&Aluwihare, Lihini 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.
MLA White, Margot E.,et al."Recent Increases in Water Column Denitrification in the Seasonally Suboxic Bottom Waters of the Santa Barbara Basin".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6786-6795.
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