<div><p>Samples were collected every two weeks (March-October) or monthly (November-February) using Mission-Aransas National Estuarine Research Reserve Small Boat. Water samples from both the surface (~0.5 meters) and the bottom of the water column (within 0.5 m from the sediment-water interface) were obtained using a Van Dorn water sampler. </p></div>
Carbonate chemistry in Mission Aransas Estuary (2014-2017, 2018-2020)
Carbonate Chemistry 2014-2017 and 2018-2020
<div><p>Following the standard ocean acidification operating protocol, unfiltered water samples were collected in 250 mL borosilicate glass bottles for carbonate system characterization. 100 µL saturated mercuric chloride (HgCl2) was added into the sample bottles and bottle stoppers were replaced after the application of Apiezon® L grease and secured with a rubber band and hose clamp. These preserved samples were used for salinity, total alkalinity (TA), total dissolved inorganic carbon (DIC), and pH analyses within two months of sample collection.</p>
<p>In-situ temperatures at both the surface (~0.5 m) and the bottom of the water column (within 0.5 m from the sediment-water interface) were obtained using a calibrated YSI 6920 multisonde. Salinity was measured using a benchtop salinometer (Orion Star™ A12, Thermo Scientific) which was calibrated using MilliQ and known salinity certified reference material (CRM). Total Alkalinity (TA) was analyzed at 22±0.1°C using Gran titration on an automated titration system (AS-Alk2, Apollo Scitech Inc.). DIC was analyzed using infrared detection on an AS-C3 DIC analyzer (Apollo Scitech Inc.). Certified reference material was used to ensure the quality of the analysis and optimal performance of the instruments. Total scale pH for salinity ≥20 samples was measured on a spectrophotometer at 25°C using purified m-cresol purple. The equation in Liu et al. (2011) was used in the calculation of pH values. For low salinity waters (<20) prior to September 28th, 2017, a potentiometric method was used to measure pH. An Orion® Ross™ high precision glass electrode was used and three pH standards (4.01, 7.00, and 10.01) were used to calibrate the electrode. Beginning September 28th, 2017, the low salinity samples were also run on the spectrophotometer, and the Douglas and Byrne (2017) equation was used to calculate pH on total scale. Calcium concentration ([Ca2+]) was measured (from non-preserved water samples) using an automatic titration with an ethylene glycol tetraacetic acid (EGTA) titrant on a Metrohm Titrando. The end-point was detected using a Metrohm calcium ion-selective electrode.</p></div>
835227
Carbonate Chemistry 2014-2017 and 2018-2020
2021-01-04T23:15:21-05:00
2021-01-04T23:15:21-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:835227
Carbonate chemistry in Mission Aransas Estuary from May 2014 to Feb 2017 and Dec 2018 to Feb 2020
The Ecosystem Science and Modeling lab has been collecting water samples from five stations in the Mission-Aransas Estuary (MAE, Northwest Gulf of Mexico, Texas coast) for carbonate system characterization on a monthly to twice monthly basis since May 2014. This dataset includes temperature, salinity, dissolved inorganic carbon (DIC), total alkalinity (TA), calcium, and pH measurements from surface and bottom water samples in MAE from May 2014 – Feb 2017 and Dec 2018 – Feb 2020. Additional data for this estuary to fill in the Feb 2017 – Dec 2018 gap are also archived with BCO-DMO (http://www.bco-dmo.org/dataset/784673, doi:10.1575/1912/bco-dmo.784673.1).
false
McCutcheon, M. R., Hu, X. (2021) Carbonate chemistry in Mission Aransas Estuary from May 2014 to Feb 2017 and Dec 2018 to Feb 2020. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-01-04 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.835227.1 [access date]
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10.26008/1912/bco-dmo.835227.1
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carbonate chemistry
ocean acidification
Estuary
carbon cycling
2021-01-04
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