Abstract:

This dataset contains CTD/rosette data collected aboard the R/V Point Sur cruise PS16-20 in the Mississippi Bight from 2016-03-30 to 2016-04-10 during the CONCORDE Spring 2016 field experiment. Data from CTD/rosette sampling system includes tracers such as nutrients, oxygen, oxygen and hydrogen isotopic composition of the water, selected trace elements (molybdenum and cesium), chlorophyll, radium isotopes as well as the location, date, and depth at the sampling collection site. This data was obtained to help constrain water and nutrient sources as well as mixing. The cruise R/V Point Sur PS16-20 was led by chief scientists Dr. Adam Greer and Dr. Allison Deary.

Suggested Citation:

Shiller, Alan M.; Box, Hannah; Gilbert, Melissa; Joung, DongJoo; Sanial, Virginie. 2019. CTD/Rosette data collected aboard the R/V Point Sur cruise PS16-20 in the Mississippi Bight, Gulf of Mexico from 2016-03-30 to 2016-04-10. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-9wex-sg48

Publications:

Sanial, V., Shiller, A., Joung, D. J., & Ho, P. (2019). Extent of Mississippi River water in the Mississippi Bight and Louisiana Shelf based on water isotopes. Estuarine, Coastal and Shelf Science. doi:10.1016/j.ecss.2019.04.030

Purpose:

Investigation of water chemistry, biology, and circulation in the Mississippi Bight. All CONCORDE cruises were designed to provide observational (physical, chemical, biological) data on the Bight for use in a synthetic model describing oil exposure potential.

Data Parameters and Units:

Station [station ID]; Type [surface, middle, bottom]; Date [mm/dd/yyyy]; Latitude [°N, decimal degrees]; Longitude [°E, decimal degrees]; Depth [m]; Salinity [PSS-78]; Temperature [degree C]; NO₃ + NO₂ [µmol/kg]; PO₄ [µmol/kg]; NO²⁻ [µmol/kg]; NH4⁺ [µmol/kg]; Si(OH)₄ [µmol/kg]; TDN [Total dissolved nitrogen, µmol/kg]; O₂ [CTD Corrected, µmol/kg]; Ba, dissolved [nmol/kg]; δ18O (water) [‰ VSMOW], δD (water) [‰ VSMOW]; Chl.a [Chlorophyll a, µg/L]; Mo, dissolved [nmol/kg]; Cs, dissolved [nmol/kg]; Ra223 [dpm/100L]; Ra224 [dpm/100L]; Ra226 [dpm/100L]; Ra228 [dpm/100L]. The cruise documentation was provided for the R/V Point Sur cruise PS16-20. Note: N/A = not applicable, bdl = below detection limit.

Methods:

Information on the analytical procedures pertinent to this dataset can be found in the multiple publications as mentioned below: For dissolved Si analysis - Please refer to Brzezinski et al., 1995 For dissolved Mo analysis - Please refer to Ho et al., 2018 For dissolved Ba analysis - Please refer to Joung and Shiller, 2014 For dissolved radium analysis - Please refer to Keep L. et al., 2018 For dissolved inorganic N and P analysis - Please refer to Maclntyre et al., 2011 For water isotope analysis - Please refer to Sanial et al., 2019 For dissolved Mo and Cs analysis - Please refer to Shim et al., 2012 For Toal Dissolved Nitrogen (TDN) analysis - Please refer to Solorzano and Sharp, 1980

Instruments:

CTD/Rosette ThermoFisher-Element XR, High resolution inductively coupled plasma-mass spectrometer Picarro L2120i-Cavity ring-down spectrometer Radium Delayed Coincidence Counter (RaDeCC) system for short-lived radium isotopes Gamma counter (well-type, germanium) Skalar autoanalyzer

Provenance and Historical References:

Brzezinski, M. A., & Nelson, D. M. (1995). The annual silica cycle in the Sargasso Sea near Bermuda. Deep Sea Research Part I: Oceanographic Research Papers, 42(7), 1215–1237. doi:10.1016/0967-0637(95)93592-3 Ho, P., Lee, J.-M., Heller, M. I., Lam, P. J., & Shiller, A. M. (2018). The distribution of dissolved and particulate Mo and V along the U.S. GEOTRACES East Pacific Zonal Transect (GP16): The roles of oxides and biogenic particles in their distributions in the oxygen deficient zone and the hydrothermal plume. Marine Chemistry, 201, 242–255. doi:10.1016/j.marchem.2017.12.003 Joung, D., & Shiller, A. M. (2014). Dissolved barium behavior in Louisiana Shelf waters affected by the Mississippi/Atchafalaya River mixing zone. Geochimica et Cosmochimica Acta, 141, 303–313. doi:10.1016/j.gca.2014.06.021 Kipp, L. E., Sanial, V., Henderson, P. B., van Beek, P., Reyss, J.-L., Hammond, D. E., … Charette, M. A. (2018). Radium isotopes as tracers of hydrothermal inputs and neutrally buoyant plume dynamics in the deep ocean. Marine Chemistry, 201, 51–65. doi:10.1016/j.marchem.2017.06.011 Macintyre, H. L., Stutes, A. L., Smith, W. L., Dorsey, C. P., Abraham, A., & Dickey, R. W. (2010). Environmental correlates of community composition and toxicity during a bloom of Pseudo-nitzschia spp. in the northern Gulf of Mexico. Journal of Plankton Research, 33(2), 273–295. doi:10.1093/plankt/fbq146 Sanial, V., Shiller, A., Joung, D. J., & Ho, P. (2019). Extent of Mississippi River water in the Mississippi Bight and Louisiana Shelf based on water isotopes. Estuarine, Coastal and Shelf Science. doi:10.1016/j.ecss.2019.04.030 Shim, M.-J., Swarzenski, P. W., & Shiller, A. M. (2012). Dissolved and colloidal trace elements in the Mississippi River delta outflow after Hurricanes Katrina and Rita. Continental Shelf Research, 42, 1–9. doi:10.1016/j.csr.2012.03.007 Solórzano, L., & Sharp, J. H. (1980). Determination of total dissolved nitrogen in natural waters1. Limnology and Oceanography, 25(4), 751–754. doi:10.4319/lo.1980.25.4.0751

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