Lisa L. Robbins Kira E. Barrera Kendra L. Daly Paul O. Knorr 2013 Autonomous Flow-Through (AFT) pH data of the West Florida Shelf vector digital data Data Series 883 St. Petersburg, Fla U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center http://dx.doi.org/10.3133/ds883 The United States Geological Survey (USGS) is conducting a study on 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 R/V Weatherbird II, a ship of opportunity led by Kendra Daly, of the University of South Florida (USF). Cruises left from and returned to Saint Petersburg, Florida, but followed different routes (see Trackline). The USGS collected data pertaining to pH, dissolved inorganic carbon (DIC), and total alkalinity in discrete samples. Discrete surface samples were taken hourly while in transit during cruises. Along with the surface samples, another set of discrete samples were taken at various depths at stations. In addition to the discrete samples, flow-through data were collected on cruises in a variety of forms. Surface CTD data were collected every five minutes and included temperature, salinity, and pH. Two additional flow-through instruments were setup to record pH and CO2 every 15 minutes. Vertical CTD profiles were collected by USF, using the following sensors: CTD, oxygen, chlorophyll fluorescence, optical backscatter, and transmissometer, corroborating USGS data. Additionally, discrete depth samples for nutrients, chlorophyll, and particulate organic carbon/nitrogen were collected. Discrete water samples were collected underway to corroborate the continuous partial pressure of carbon dioxide (pCO2) measurements. Water samples were analyzed for salinity, pH, and total alkalinity at the USGS geochemistry laboratory in St. Petersburg, Florida. These continuous flow-through data are used to corroborate the discrete sample data using CO2SYS The USGS Saint Petersburg Coastal and Marine Science Center (SPCMSC) - St. Petersburg, Fla., assigns a unique identifier to each cruise or field activity. For example, 12BHM01 indicates the data were collected in 2012 for Benthic Habitat Mapping and the data were collected during the first field activity for that project in that calendar year. Refer to http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html for a detailed description of the method used to assign the cruise ID. This publication contains data for each of the five benthic habitat cruises conducted aboard the Research Vessels (R/V) Weatherbird II and Bellows in 2012: 12BHM01 February 15-24 (Weatherbird II), 12BHM02 April 24 - 29 (Bellows), 12BHM03 May 8 - 17 (Weatherbird II), 12BHM04 June 29 - July 1 (Bellows) and 12BHM05 August 2 - 12 (Weatherbird II) 2012 data collection Complete None planned -89.0000 -82.5000 30.5000 27.0000 Ocean Chemistry pH total carbon Salinity carbon flux Ocean Acidification pCO2 Temperature Region West Florida Shelf Florida United States None Mesopelagic Epipelagic ocean surface Bathypelagic None 2012 None USGS and USF request to be acknowledged as originators of the data in future products or derivative research. United States Geological Survey St. Petersburg Coastal and Marine Science Center Lisa Robbins Research Oceanographer mailing and physical 600 4th Street South St. Petersburg Florida 33701 US 727-803-8747 727-803-2032 8am to 5pm M-F EST Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.4.4000 ; Microsoft Excel These data were collected in the field and have not been checked for internal consistencies. These data were collected along tracklines (2-D) and are therefore inherently incomplete. No data were collected between tracklines. Flow-through data were collected with a Sunburst AFT pH, which measures pH on the total hydrogen ion scale and was attached to the flow-through system. This system sampled the seawater every three minutes with a precision and accuracy of 0.001 and ±0.003, respectively. The Sunburst AFT-CO2 system was used to measure the partial pressure of CO2 in water (pCO2) and was attached to the shipboard flow-through system. The instrument sampled every five minutes and had a precision and accuracy of 1 ppm and ± 3 ppm, respectively. 2012 Data were entered into a spreadsheet and merged with other data sources: GPS from the ship as well as the lab results of total alkalinity and dissolved inorganic carbon from the USGS St. Petersburg Carbon Analytical Laboratory. 2012 2012___AFT_pH.csv 2012___AFT_pH.xls The spreadsheet was imported into ArcGIS 10 and converted into a shapefile. 2012___AFT_pH.xls 2012 8.9831528411952133e-009 8.9831528411952133e-009 Decimal degrees D WGS 1984 WGS 1984 6378137.0 298.257223563 2012__AFT_pH Autonomous Flow-Through (AFT) system continuous measurements of chemical and physical parameters of seawater USGS FID* Internal feature number. ESRI Sequential, unique whole numbers that are automatically generated. Shape* Feature geometry. ESRI Coordinates defining the features. Cruise_ID Cruise name according to the USGS Field Activity Collection USGS 12BHM01, 12BHM02, 12BHM03, 12BHM04, 12BHM05 Date_UTC Date in UTC time zone; MM/DD/YYYY USGS Date of sample collection in MM/DD/YYYY format 20120215 20120812 Time_UTC Time of data collection in HH:MM UTC, 24 hour format USGS Time of data collection in HH:MM UTC Date_EDT Date in EDT time zone; MM/DD/YYYY USGS Date of sample collection in MM/DD/YYYY format 20120215 20120812 Time_EDT Time of data collection in HH:MM EDT, 24 hour format USGS Time of data collection in HH:MM EDT Latitude Latitude in decimal degrees USGS Longitude Longitude in decimal degrees USGS pH a measure of the acidity and alkalinity of a solution USGS Temp_C water temperature USGS Ship_Sal_PSU Salinity in Practical Salinity Units USGS All attributes are common between the three data formats provided (.csv, .xls, .shp), except for the attributes FID and SHAPE (indicated by *), which are found only within the shapefile (.shp) because they are unique to that data type. Additionally, the GPS data were taken from either the R/V Weatherbird II's or Bellow's navigation logs and matched with the time logs on the sonde. These data were not QA/QC checked and could have data errors due to tubes clogging or from flow-through shutdown due to inclement weather. Robbins, L.L., Knorr, P.O., Barrera, K. E., Daly, K.L., 2012, USGS Field Activities 12BHM01, 12BHM02, 12BHM03, 12BHM04 and 12BHM05 on the West Florida Shelf, Gulf of Mexico, in February, April, May, June and August 2012: U.S. Geological Survey Data Series 883, available online at http://dx.doi.org/10.3133/ds883. U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Lisa Robbins mailing and physical address 600 4th Street South St. Petersburg Florida 33701 US 727-803-8747 This digital publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data published in this report have been used by the USGS, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Graphical map depictions are intended to be used within the map scale limits applicable to the source data. Although software enables the user to view data at various scales, the user is cautioned to refer to the source documentation for the appropriate map scale limitations. Microsoft Excel (.xls); Comma-delimited text file (.csv); ArcGIS (.SHP) ZIP File Format http://dx.doi.org/10.3133/ds883 Free 20130610 United States Geological Survey St. Petersburg Coastal and Marine Science Center Kira E. Barrera Research Assistant mailing and physical address 600 4th Street South St. Petersburg Florida 33701 US 727-803-8747 727-803-2032 8am to 5pm M-F EST FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998