Abstract:

For the purpose of monitoring water quality, discrete hydrographic measurements and grab samples were collected monthly via small boat-based trips at nine stations established throughout Baffin Bay, Texas between 2013-05-15 and 2013-12-13. Grab samples were analyzed for organic and inorganic nutrients, and chlorophyll a.

Suggested Citation:

Wetz, Michael. 2021. Monthly discrete water quality measurements of Baffin Bay, Texas between 2013-05-15 and 2013-12-13. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/JPT4ZJX0

Purpose:

To continually monitor water quality of the Baffin Bay system.

Data Parameters and Units:

Date (mm/dd/yyyy) - sampling date Time (hh:mm) - collection time (Central Standard Time) Latitude (DD) - Latitude, south is negative (decimal degrees) Longitude (DD) - Longitude, west is negative (decimal degrees) Site (unitless) - sampling site Rep (unitless) - replicate A or B Level (m) - depth at which measurements/samples were collected (meters) Chlorophyll_a (µg/L) - chlorophyll a content (micrograms per liter) Conductivity (µS/cm) - conductivity (microsiemens per centimeter) Salinity (unitless) - salinity DO (mg/L) - Dissolved oxygen concentration (milligrams per liter) DO_Pct (%) - Dissolved oxygen saturation pH (pH units) - pH Temperature (°C) - temperature (degrees Celsius) Depth (m) - total water depth at site (meters) Secchi (m) - secchi depth (meters) TSS (mg/L) - total suspended solids (milligrams per liter) VSS (mg/L) - volatile suspended solids (milligrams per liter) Turbidity (NTU) - turbidity (nephelometric turbidity unit) DOC (µM) - dissolved organic carbon (micromoles per liter) TDN (µM) - total dissolved nitrogen (micromoles per liter) TOC (µM) - total organic carbon (micromoles per liter) TN (µM) - total nitrogen (micromoles per Liter) Ammonium (µM) - ammonium (micromoles per liter) N_N (µM) - nitrate + nitrite (micromoles per liter) Nitrite (µM) - nitrite (micromoles per liter) ortho_P (µM) - orthophosphate (micromoles per liter) Silicate (µM) - silicate (micromoles per liter) Comments (unitless) - comments concerning sampling or data Codes within dataset: "NR" (Not Recorded) - data was either not recorded in the field, or has been left out of the dataset "BDL" (Below Detection Limit) - for organic and inorganic nutrients, the value obtained from analysis fell below the detection limit of the instrument

Methods:

At each site, hydrographic measurements were collected using a YSI ProPlus multi-parameter instrument from the surface to the bottom at intervals of 0.5 m. A vertical profile was obtained in this manner for temperature, salinity, conductivity, dissolved oxygen concentration and saturation, and pH. A secchi measurement was obtained by submerging a secchi disc in a spot out of direct sunlight to a depth at which it could no longer be seen, and total depth was obtained by lowering the secchi disc to the bottom. Discrete grab samples were collected at 10 cm below the surface and 10 cm above the bottom (using a Van Dorn bottle) in acid-washed, polycarbonate amber bottles, and were stored on ice until processing. Refer to Wetz et al. 2017 for further methodological details.

Instruments:

YSI Professional Plus Multi-Parameter Probe Seal QuAAtro autoanalyzer Shimadzu TOC-Vs analyzer with nitrogen module Turner Trilogy fluorometer

Provenance and Historical References:

Wetz, Michael S., Emily K. Cira., Blair Sterba‐Boatwright, Paul A. Montagna, Terence A. Palmer, and Kenneth C. Hayes. 2017. Exceptionally high organic nitrogen concentrations in a semi‐arid South Texas estuary susceptible to brown tide blooms. Estuarine, Coastal and Shelf Science 188: 27–37. DOI: 10.1016/j.ecss.2017.02.001

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