Abstract:

This dataset contains chemical tracers in Mississippi Sound water samples collected between 10/28/2018- 12/7/2021. An investigation of water chemistry in the Mississippi Sound, especially groundwater tracers, nutrients, water isotopes, and trace metals was conducted. Surface grab samples and surface continuous samples were collected between October 2018 and December 2021. Samples were collected during small boat surveys in Mississippi Sound.

Suggested Citation:

Shiller, Alan M., Amy Moody, and Melissa Gilbert. 2023. Chemical tracers in Mississippi Sound water samples collected from 2018-10-28 to 2021-12-07. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/eagwt2sa

Purpose:

This sampling was conducted to determine the impact of submarine groundwater discharge, river inputs, and openings of the Bonnet Carré Spillway on nutrient and trace metal dynamics in Mississippi Sound.

Data Parameters and Units:

Depth [m], Temperature [C], Oxygen [umol/L], Salinity [ppt], Radon in Water [dpm/L], Ra224 [dpm/100L], Ra223 [dpm/100L], Ra228 [dpm/100L], Ra226 [dpm/100L], CH4 [nmol/L], δ18O(water) [‰ VSMOW], δD(water) [‰ VSMOW], NO3 + NO2 [µmol/L], NH4+ [µmol/L], PO4 [µmol/L], SiO3 [µmol/L], DON [µmol/L], DOP [µmol/L], Ba [nmol/L], Cs [nmol/L], Mo [nmol/L], Cd [nmol/L], Re [nmol/L], Pb [nmol/L], U [nmol/L], V [nmol/L], Cr [nmol/L], Mn [nmol/L], Fe [nmol/L], Ni [nmol/L], Cu [nmol/L], As [nmol/L]

Methods:

Nutrients: Please refer to Seal AA3 Autoanalyzer methods: Ammonia – Method G-171-96, Nitrate/Nitrite/Total N – G-172-96, Phosphate/Total Phosphorus – G-297-03, Silicate – G-177-96 For water isotope analysis - Please refer to Sanial et al., 2019 For CH4 analysis - Please refer to Roberts and Shiller, 2015 For dissolved radium analysis - Please refer to Moore and Arnold, 1996 and Moore, 1996 For dissolved trace element analyses - Please refer to Ho et al., 2019, Joung and Shiller, 2013, and Shim et al., 2012 For radon analyses – Please refer to RAD7, Durridge Inc. and RAD Aqua, Durridge Inc. Manuals

Instruments:

YSI EXO 2 Multiparameter Sonde RAD7 and RAD Aqua/ RAD Aqua methods SEAL AA3 Autoanalyzer/Ammonia (G-171-96), Nitrate/Nitrite/Total N (G-172-96), Phosphate/Total Phosphorus (G-297-03), Silicate (G-177-96) Element XR, High resolution inductively coupled plasma-mass spectrometer, ThermoFisher Cavity ring-down spectrometer, Picarro L2120i, Picarro G2301 Radium Delayed Coincidence Counter (RaDeCC) system for short-lived radium isotopes Gamma counter, well-type, germanium

Provenance and Historical References:

References: Durridge Company Inc., 2022. RAD7. https://durridge.com/documentation/RAD7%20Manual.pdf Durridge Company Inc., 2020. RAD Aqua. https://durridge.com/documentation/RAD%20AQUA%20Manual.pdf Ho, P., Shim, M.J., Howden, S.D., Shiller, A.M., 2019. Temporal and spatial distributions of nutrients and trace elements (Ba, Cs, Cr, Fe, Mn, Mo, U, V and Re) in Mississippi coastal waters: Influence of hypoxia, submarine groundwater discharge, and episodic events. Cont. Shelf Res. 175, 53–69. https://doi.org/10.1016/j.csr.2019.01.013 Joung, D.J, Shiller, A.M., 2013. Trace element distributions in the water column near the Deepwater Horizon well blowout. Environ. Sci. Technol. 47(5): 2161-2168. doi: 10.1021/es303167p. Moore, W.S. and Arnold, R., 1996. Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter. J. Geophys. Res. 101, 1321–1329. Moore, W. S., 1996. Large groundwater inputs to coastal waters revealed by 226Ra enrichments. Nature 380, 612–614. Roberts, H.M. and Shiller, A.M., 2015. Determination of dissolved methane in natural waters using headspace analysis with cavity ring-down spectroscopy. Analytica Chimica Acta, 856, pp. 68-73. Sanial, V., Moore, W.S., Shiller, A.M., 2021. Does a bottom-up mechanism promote hypoxia in the Mississippi Bight?. Marine Chemistry, 235, 104007. Seal Analytical, AutoAnalyzer Multi-test Methods. https://www.seal-analytical.com/Methods/AutoAnalyzer-Methods/AutoAnalyzer-Multi-test-Methods Shim, M.J., Cai, Y., Guo, L., Shiller, A.M., 2017. Floodplain effects on the transport of dissolved and colloidal trace elements in the East Pearl River, Mississippi. Hydrol. Process. 31, 1086–1099. https://doi.org/10.1002/hyp.11093.

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