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Depth profiles of suspended carbon and nitrogen along a North Pacific transect: Concentrations, isotopes, and ratios

Dong, Sijia and Wang, Xingchen Tony and Subhas, Adam V. and Pavia, Frank J. and Adkins, Jess F. and Berelson, William M. (2022) Depth profiles of suspended carbon and nitrogen along a North Pacific transect: Concentrations, isotopes, and ratios. Limnology and Oceanography, 67 (1). pp. 247-260. ISSN 0024-3590. doi:10.1002/lno.11989. https://resolver.caltech.edu/CaltechAUTHORS:20211214-16662000

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Abstract

We present concentrations of total particulate carbon (PC), carbonate (PIC), total particulate nitrogen (PN), δ¹³C and δ¹⁵N of suspended particles along a North Pacific transect. In the upper 400 m, suspended PIC to particulate organic carbon (POC) ratios generally follow published sinking PIC/POC ratios. Below 600 m, suspended PIC/POC become significantly lower than sinking PIC/POC, likely indicating PIC dissolution within the suspended load. In three out of the five stations, suspended PN δ¹⁵N increase with depth from the euphotic zone to the thermocline, consistent with previous observations in many ocean regions (e.g.,BATS and HOT). However, in the other two stations where phytoplankton blooms were encountered, high suspended PN δ¹⁵N (up to 12‰) were observed in the euphotic zone, which was likely caused by the export of low-δ¹⁵N PN during the phytoplankton blooms. Average C_(org) : N ratio of suspended particles along the transect is 5.1 ± 0.2, with the value in the subtropical gyre (5.8 ± 0.3) slightly higher than the subarctic gyre (4.6 ± 0.2).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/lno.11989DOIArticle
ORCID:
AuthorORCID
Dong, Sijia0000-0002-5811-9333
Wang, Xingchen Tony0000-0001-5316-789X
Subhas, Adam V.0000-0002-7688-6624
Pavia, Frank J.0000-0003-3627-0179
Adkins, Jess F.0000-0002-3174-5190
Berelson, William M.0000-0002-1526-3802
Additional Information:© 2021 Association for the Sciences of Limnology and Oceanography. Issue Online: 17 January 2022; Version of Record online: 26 November 2021; Manuscript accepted: 09 November 2021; Manuscript revised: 07 November 2021; Manuscript received: 16 March 2021. This work was supported by NSF Ocean Acidification grants (OCE1220600 and OCE1220302), Grantham Foundation and Simons Foundation (Grant 497534). The authors would like to thank the editor and reviewer for their helpful comments on an earlier version of our manuscript. They would also like to thank Mong Sin Christine Wu for her help in putting together Fig. 6a; Fenfang Wu and Nick E. Rollins for their help with EA analysis; Nicholas Hawco for his help in plotting the NASA satellite chlorophyll data; Nathan Kemnitz, Yi Hou, Abby Lunstrum, and the captain and crews on Kilo Moana for their assistance at sea. Conflict of Interest: None declared.
Funders:
Funding AgencyGrant Number
NSFOCE-1220600
NSFOCE-1220302
Grantham Foundation for the Protection of the EnvironmentUNSPECIFIED
Simons Foundation497534
Issue or Number:1
DOI:10.1002/lno.11989
Record Number:CaltechAUTHORS:20211214-16662000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20211214-16662000
Official Citation:Dong, S., Wang, X.T., Subhas, A.V., Pavia, F.J., Adkins, J.F. and Berelson, W.M. (2022), Depth profiles of suspended carbon and nitrogen along a North Pacific transect: Concentrations, isotopes, and ratios. Limnol Oceanogr, 67: 247-260. https://doi.org/10.1002/lno.11989
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112454
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:16 Dec 2021 18:58
Last Modified:18 Jan 2022 18:29

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