Lisa L. Robbins Kira E. Barrera Kendra L. Daly Paul O. Knorr 20190416 tabular digital data U.S. Geological Survey Data Release doi:10.5066/F7RB72R7 St. Petersburg, FL, USA U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/F7RB72R7 The United States Geological Survey (USGS) is studying the effects of climate change on ocean acidification within the Gulf of Mexico; dealing specifically with the effect of ocean acidification on marine organisms and habitats. To investigate this, the USGS participated in cruises on the West Florida Shelf and northern Gulf of Mexico regions aboard the research vessel (R/V) Weatherbird II or Bellows, ships of opportunity led by Dr. Kendra Daly, of the University of South Florida (USF) in July and August, 2013. Cruises left from and returned to Saint Petersburg, Florida, but followed different routes. The USGS collected geochemical data pertaining to pH, dissolved inorganic carbon (DIC), total carbon dioxide (TCO2), and total alkalinity (TA) in discrete samples at various depths from predetermined stations. Discrete surface samples were also taken, while in transit, during both cruises. Discrete water samples were collected underway and at stations. Water samples were analyzed at the USGS geochemistry laboratory in St. Petersburg, Florida. Data were collected during USGS field activity number (FAN) 13BHM01 and 13BHM02; additional survey details are available at http://cmgds.marine.usgs.gov/. This data release contains data for two benthic habitat cruises conducted in 2013: 13BHM01, July 8-12 (R/V Bellows) and 13BHM02, August 5-11 (R/V Weatherbird II). The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, FL, assigns a unique identifier to each cruise or field activity. For example, 13BHM01 indicates the data were collected in 2013 for Benthic Habitat Mapping and the data were collected during the first field activity for that project in that calendar year. 20130708 20130811 ground condition Complete None planned -88.32855 -82.67283 30.02197 27.08116 USGS Metadata Identifier USGS:066aeb9b-4c1a-451e-919f-fc9c04c08393 ISO 19115 Topic Category geoscientificInformation environment oceans USGS Thesaurus geochemistry marine geology salinity ocean acidification marine chemistry None pH total carbon carbon flux pCO2 temperature ocean chemistry None West Florida Shelf Florida United States None Mesopelagic Epipelagic ocean surface Bathypelagic None 2013 None The USGS and USF requests to be acknowledged as originators of the data in future products or derivative research. USGS St. Petersburg Coastal and Marine Science Center mailing and physical

600 4th Street South

St. Petersburg Florida 33701 US 727-502-8000 727-502-8181 8 AM to 5 PM M-F EST Microsoft Windows 7 Version 6.1 (Build 7600); Microsoft Excel 2010 Yao, W., and Byrne, R. 19980801 Philadelphia, PA Deep Sea Research Part 1: Oceanographic Research Papers 45.8, 1383-1392 https://doi.org/10.1016/S0967-0637(98)00018-1 Dickson, A. G., Sabine, C. L., and Christian, J. R. (eds.) 2007 Sidney, BC, Canada North Pacific Marine Science Organization http://cdiac.ornl.gov/ftp/oceans/Handbook_2007/Guide_all_in_one.pdf These datasets are from field activities with consistent instrument calibrations. This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details. Surface samples were taken from a flowthrough system during ship transit (not at stations). Samples were transported to the USGS Carbon Chemistry Laboratory in St. Petersburg, Florida or Robert Byrne's Laboratory at USF. Total alkalinity samples were analyzed with a custom automatic titration system consisting of either a USB-4000 or USB-2000 fiber optic spectrometer (Ocean Optics, Inc. USA), a 665 Dosimat auto-titrator with stir plate, and a purging system with high-purity N2 gas following the methods of Yao and Byrne (1998). Total carbon was analyzed using a CM5014 CO2 coulometer (UIC, Inc., USA) with Model CM5130 Acidification Modules following the coulometric methods of Dickson and others (2007). Precision for these methods was better than ± 2 micromole per kilogram (mol/kg) for TA and TCO2. 2013 Data were entered into a spreadsheet and merged with the other project data sources: GPS from the ship, salinity and temperature from the YSI 6600 sonde, and the lab results of total alkalinity and disolved inorganic carbon from the USGS St. Petersburg Carbon Analytical Laboratory. Processed files were saved in Comma Separated Values (.csv) and Microsoft Excel Workbook (.xlsx) formats. 2013 2013_July_Samples_Surface.csv 2013_July_Samples_Surface.xlsx 2013_August_Samples_Surface.csv 2013_August_Samples_Surface.xlsx Added keywords section with USGS persistent identifier as theme keyword. 20201013 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov 0.019793873 0.0224041157 Decimal Degrees D WGS 1984 WGS 1984 6378137.0 298.257223563 2013_July_Samples_Surface.csv, 2013_August_Samples_Surface.csv Chemical and physical measurements of seawater surface samples USGS Cruise_ID Cruise name according to the USGS Field Activity Number USGS 13BHM01, 13BHM02 Sample Sample identification number USGS Sequential, numeric sample identifier. "dup", if present indicates a duplicate sample collected for quality control purposes Depth_m Depth at which the sample was collected USGS 0 0 meters Date_Time_UTC Date in UTC time zone; M/DD/YYYY Time in UTC time zone; HH:MM USGS Date and time of sample collection in M/DD/YYYY HH:MM format Coordinated Universal Time (UTC) Date_Time_EST Date in EST time zone; M/DD/YYYY Time in EST time zone; HH:MM USGS Date and time of data collection in M/DD/YYYY HH:MM Eastern Standard Time (EST) Date_EST Date of sample collection in M/DD/YYYY format EST USGS Date of data collection in M/DD/YYYY format EST Time_EST Time of data collection in HH:MM EST USGS Time of data collection in HH:MM EST Latitude Latitude in geographic coordinate system (World Geodetic System of 1984) decimal degrees USGS 27.0811 30.0219 decimal degrees Longitude Longitude in geographic coordinate system (World Geodetic System of 1984) decimal degrees USGS -88.3285 -82.6728 decimal degrees Salinity_ppt Salinity in parts per thousand USGS 20.10 37.50 parts per thousand Temp_C Water temperature in degrees Celsius USGS 10.0 96.00 Degrees Celsius TCO2 (µmol/kgSW) Total Carbon Dioxide USGS 1785.2 2100.3 micromole per kilogram of seawater TCO2 (µmol/kgSW)_Flag World Ocean Circulation Experiment (WOCE) Quality Control Data Flagging Convention (https://www.nodc.noaa.gov/woce/woce_v3/wocedata_1/whp/exchange/exchange_format_desc.htm) USGS 2 Good USGS 3 Questionable USGS 4 Bad USGS 6 Average of replicates USGS 9 Not collected USGS TA (µmol/kgSW) Total Alkalinity USGS 2016.9 2442.58 micromole per kilogram of seawater TA (µmol/kgSW)_Flag World Ocean Circulation Experiment (WOCE) Quality Control Data Flagging Convention (https://www.nodc.noaa.gov/woce/woce_v3/wocedata_1/whp/exchange/exchange_format_desc.htm) USGS 2 Good USGS 3 Questionable USGS 4 Bad USGS 6 Average of replicates USGS 9 Not collected USGS Notes Description, concerns, viability of samples or environment USGS Description of sampling concerns, viability of samples or environment. The entity and attribute information provided here describes the tabular datasets. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the dataset. The entity and attribute information was generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information. USGS St. Petersburg Coastal and Marine Science Center mailing and physical address

600 4th Street South

St. Petersburg Florida 33701 US 727-502-8000 This digital publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Microsoft Excel (.xls); Comma-delimited text file (.csv) ZIP File Format https://coastal.er.usgs.gov/data-release/doi-F7RB72R7/data/2013_July_Samples_Surface.zip https://coastal.er.usgs.gov/data-release/doi-F7RB72R7/data/2013_August_Samples_Surface.zip Free 20211109 United States Geological Survey, St. Petersburg Coastal and Marine Science Center SPCMSC Data Management Group mailing and physical address

600 4th Street South

St. Petersburg Florida 33701 US 727-502-8000 gs-g-spcmsc_data_inquiries@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998