Dataset: Nutrients, nitrate isotopes, and DON isotopes data from samples collected in the Gulf of Mexico on R/V Nancy Foster cruises NF1704 and NF1802 in May 2017 and May 2018

ValidatedFinal no updates expectedDOI: 10.26008/1912/bco-dmo.834984.1Version 1 (2020-12-31)Dataset Type:Cruise Results

Principal Investigator: Angela N. Knapp (Florida State University EOAS)

Co-Principal Investigator: Michael R. Landry (University of California-San Diego Scripps)

BCO-DMO Data Manager: Dana Stuart Gerlach (Woods Hole Oceanographic Institution)

Program: Second International Indian Ocean Expedition (IIOE-2)

Project: Collaborative Research: Mesoscale variability in nitrogen sources and food-web dynamics supporting larval southern bluefin tuna in the eastern Indian Ocean (BLOOFINZ-IO)

Abstract

This data set includes water column inorganic nutrient and dissolved organic nitrogen (DON) concentration and nitrate+nitrite d15N and d18O and DON δ15N measurements from May 2017 and May 2018 cruises in the North/Central Gulf of Mexico that were used together with sinking particulate N data to construct δ15N budgets.

Cite Dataset
Spatial Extent: N:28.36 E:-87.21 S:25.66 W:-90.19
Temporal Extent: 2017-05-11 - 2018-05-19

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Water column samples were collected by Niskin bottle on a CTD rosette (“CTD profile”) in the North/Central Gulf of Mexico during Nancy Foster cruises (NF17-04, NF18-02) in May 2017 and May 2018, as part of the NOAA RESTORE (aka BLOOFINZ-GoM) project.  All samples were 0.2 µm filtered into pre-washed HDPE bottles which were frozen at -20 degrees Celsius until analysis on land. 

Acquisition and associated instruments:
Nitrate+nitrite concentration was measured on a Thermo 42i NOx analyzer
Nitrate+nitrite d15N was measured using a Thermo Finnigan Delta V isotope ratio mass spectrometer.
Phosphate concentration was determined using a Shimadzu UV-1800 uv-vis spectrophotometer.
Ammonium concentration was determined using a Turner Trilogy fluorometer.

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Related Publications

Methods
Braman, R. S., & Hendrix, S. A. (1989). Nanogram nitrite and nitrate determination in environmental and biological materials by vanadium(III) reduction with chemiluminescence detection. Analytical Chemistry, 61(24), 2715–2718. doi:10.1021/ac00199a007
Methods
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Böhlke, J. K., & Hilkert, A. (2002). Measurement of the Oxygen Isotopic Composition of Nitrate in Seawater and Freshwater Using the Denitrifier Method. Analytical Chemistry, 74(19), 4905–4912. doi:10.1021/ac020113w
Methods
Holmes, R. M., Aminot, A., Kérouel, R., Hooker, B. A., & Peterson, B. J. (1999). A simple and precise method for measuring ammonium in marine and freshwater ecosystems. Canadian Journal of Fisheries and Aquatic Sciences, 56(10), 1801–1808. doi:10.1139/f99-128
Methods
Knapp, A. N., Sigman, D. M., & Lipschultz, F. (2005). N isotopic composition of dissolved organic nitrogen and nitrate at the Bermuda Atlantic Time-series Study site. Global Biogeochemical Cycles, 19(1). doi:10.1029/2004gb002320
Methods
Koroleff, F. (1968). Determination of total phosphorus in natural waters by means of persulfate oxidation.

Knapp, A. N., Landry, M. R. (2021) Nutrients, nitrate isotopes, and DON isotopes data from samples collected in the Gulf of Mexico on R/V Nancy Foster cruises NF1704 and NF1802 in May 2017 and May 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-12-31 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.834984.1 [access date]

Terms of Use

This dataset is licensed under Creative Commons Attribution 4.0.


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