Details:

Journal Title:
Deep Sea Research Part II: Topical Studies in Oceanography
Personal Author:
Casciotti, K.L. ; Forbes, M. ; Vedamati, J. ; Peters, B.D. ; Martin, T.S. ; ... More +
Casciotti, K.L. ; Forbes, M. ; Vedamati, J. ; Peters, B.D. ; Martin, T.S. ; Mordy, C.W. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
The ocean accounts for up to 25% of global emissions of nitrous oxide (N2O), a potent greenhouse gas. Much of this N2O flux occurs in upwelling regions near the ocean's oxygen deficient zones (ODZs), areas known for intense N2O cycling. The Eastern Tropical South Pacific (ETSP) ODZ is one such area, and large uncertainties surround the balance of processes regulating N2O production and emission in this region. Here we examined the distributions of dissolved N2O concentration and stable isotopic composition, in concert with nitrate (NO3-) and nitrite (NO2-) isotopic ratios, to understand the mechanisms that drive N2O production, consumption, and emission from the ETSP ODZ. Keeling plot analysis identified N2O production from both nitrification and denitrification (or nitrifier-denitrification) in the near-surface and in the oxycline, where the largest accumulations of N2O were found. In the N2O concentration maximum that occurs below the ODZ, a higher 15N site preference (SP) indicated nitrification was more prominent. Within the ODZ, significant enrichments were apparent in δ15Nbulk (14–22‰), δ18ON2O (68–100‰) and SP (39–60‰), implying active N2O consumption. Further scrutiny of N2O isotope data in the ODZ highlights a deviation from the relative increases in δ18ON2O and SP expected for bacterial denitrification. At high levels of N2O consumption, SP increased more than expected for the increase in δ18ON2O. This appeared to be due, at least in part, to a decrease in δ15Nβ driven by N2O production in the ODZ, rather than further increases in δ15Nα. Isotopic analysis of co-occurring NO3- and NO2- suggests that NO3- may be the dominant source of N2O in the offshore ETSP ODZ.
Keywords:
[+]
Oceanography
Source:
Deep Sea Research Part II: Topical Studies in Oceanography, 156, 155-167
DOI:
https://doi.org/10.1016/j.dsr2.2018.07.014
ISSN:
0967-0645
Format:
PDF
Publisher:
Elsevier BV
Document Type:
Journal Article
Funding:
Grant no. NA10OAR4320148
Rights Information:
Accepted Manuscript
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:3856e0ed4a75e7b973ef27517f7cd10ea3de3cf2bd2c7942be7ff719975935e9
Download URL:
https://repository.library.noaa.gov/view/noaa/57933/noaa_57933_DS1.pdf
File Type:

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