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Dataset: Hydrography, nutrients, and nitrogen uptake rates from SPIROPA cruise TN368 in July 2019

Preliminary and in progressVersion 1 (2024-05-20)Dataset Type:Cruise Results

Margaret Mulholland (Principal Investigator)

Phoebe Dreux Chappell (Co-Principal Investigator)

Corday Selden (Student)

Dana Stuart Gerlach (BCO-DMO Data Manager)

Project: Collaborative Research: Shelfbreak Frontal Dynamics: Mechanisms of Upwelling, Net Community Production, and Ecological Implications (SPIROPA)

Abstract

Continental shelves contribute a large fraction of the ocean’s new nitrogen (N) via N2 fixation; yet, we know little about how physical processes at the ocean’s margins shape diazotroph biogeography and activity. This dataset includes N2 fixation rates and hydrographic measurements collected at the Mid-Atlantic Bight shelfbreak front in July 2019. Rates were measured using the 15N2 bubble release method on repeat cross-frontal transects. This study was coordinated with the SPIROPA (‘Shelfbreak P...

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This dataset is derived from Selden et al. (2024) JGR Oceans Table S1, and McGillicuddy bottle data from TN368, the third SPIROPA cruise (https://www.bco-dmo.org/dataset/849340). The mean values of nitrogen fixation rates shown here are derived from nitrogen fixation incubation data (https://www.bco-dmo.org/dataset/928568)

Glossary of terms:
A = Atom-% enrichment
APN = Atom-% enrichment of the particulate nitrogen pool 
BDL = Below detection limit
DNQ = Detectable but not quantifiable
LOD = Limit of detection
LOQ = Limit of quantification 
N2 = Nitrogen gas
PETG = Polyethylene Terephthalate Glycol
PN = Particulate nitrogen
NFR = Nitrogen fixation rate
SUR = Specific uptake rate
t0 = time initial
tf = time final

Related Datasets

IsDerivedFrom
McGillicuddy, D. J., Sosik, H. M., Zhang, W. G., Smith, W. O., Stanley, R., Turner, J., Petitpas, C. (2022) Bottle sample data from CTD casts from the third cruise of SPIROPA project, R/V Thomas G. Thompson cruise TN368, to the New England Shelfbreak in July of 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2022-06-08 doi:10.26008/1912/bco-dmo.849340.2
[view at BCO-DMO]
IsSupplementedBy
Mulholland, M., Chappell, P. Dreux (2024) Nitrogen fixation incubation data from cruise TN368 in July 2019 for SPIROPA project. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-05-23 http://lod.bco-dmo.org/id/dataset/928568
[view at BCO-DMO]

Related Publications

Methods
Montoya, J. P., Voss, M., Kahler, P., & Capone, D. G. (1996). A Simple, High-Precision, High-Sensitivity Tracer Assay for N(inf2) Fixation. Applied and Environmental Microbiology, 62(3), 986–993. https://doi.org/10.1128/aem.62.3.986-993.1996
Methods
Selden, C. R., Mulholland, M. R., Bernhardt, P. W., Widner, B., Macías‐Tapia, A., Ji, Q., & Jayakumar, A. (2019). Dinitrogen Fixation Across Physico‐Chemical Gradients of the Eastern Tropical North Pacific Oxygen Deficient Zone. Global Biogeochemical Cycles, 33(9), 1187–1202. doi:10.1029/2019gb006242
Methods, Results
Selden, C. R., Mulholland, M. R., Crider, K. E., Clayton, S., Macías‐Tapia, A., Bernhardt, P., McGillicuddy, D. J., Zhang, W. G., & Chappell, P. D. (2024). Nitrogen Fixation at the Mid‐Atlantic Bight Shelfbreak and Transport of Newly Fixed Nitrogen to the Slope Sea. Journal of Geophysical Research: Oceans, 129(4). American Geophysical Union (AGU). https://doi.org/10.1029/2023jc020651
Methods
White, A. E., Granger, J., Selden, C., Gradoville, M. R., Potts, L., Bourbonnais, A., Fulweiler, R. W., Knapp, A. N., Mohr, W., Moisander, P. H., Tobias, C. R., Caffin, M., Wilson, S. T., Benavides, M., Bonnet, S., Mulholland, M. R., & Chang, B. X. (2020). A critical review of the 15N2 tracer method to measure diazotrophic production in pelagic ecosystems. Limnology and Oceanography: Methods, 18(4), 129–147. Wiley. https://doi.org/10.1002/lom3.10353

Mulholland, M., Chappell, P. Dreux, Selden, C. (2024) Hydrography, nutrients, and nitrogen uptake rates from SPIROPA cruise TN368 in July 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-05-20 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/927927 [access date]

Terms of Use

This dataset is licensed under Creative Commons Attribution 4.0.


If you wish to use this dataset, it is highly recommended that you contact the original principal investigators (PI). Should the relevant PI be unavailable, please contact BCO-DMO (info@bco-dmo.org) for additional guidance. For general guidance please see the BCO-DMO Terms of Use document.

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Funded by the U.S. National Science Foundation