Lisa L. Robbins Kimberly K. Yates Matthew D. Gove Paul O. Knorr Jonathan Wynn Robert H. Byrne Xuewu Liu 2012 tabular digital data Data Series 741 St. Petersburg, FL U.S. Geological Survey http://pubs.usgs.gov/ds/741/pubs741/index.html Models project the Arctic Ocean will become undersaturated with respect to carbonate minerals in the next decade. Recent field results indicate parts may already be undersaturated in late summer months, when ice melt is at its greatest extent. However, few comprehensive datasets of carbonate system parameters in the Arctic Ocean exist. Researchers from the U.S. Geological Survey (USGS) and University of South Florida (USF) collected high-resolution measurements of pCO2, pH, total dissolved inorganic carbon (DIC), total alkalinity (TA), and carbonate (CO3-2) from the Chukchi Sea and Canada Basin that fill critical information gaps concerning Arctic carbon variability. A Multiparameter Inorganic Carbon Analyzer (MICA) was used to collect over 22,000 measurements of air and sea pCO2, pH, and DIC along a 9,450-km trackline during August 2010. In addition, 240 discrete surface water samples were taken. These data are being used to characterize and model regional pCO2, pH, and carbonate mineral saturation state. A high-resolution, three-dimensional map of these results will be presented. Data collected on the August 2010 Arctic cruise will be used to create regional maps of seawater carbonate parameters, including pCO2 flux/change maps, and derivative maps on saturation state. Maps depicting pCO2 and carbonate saturation states over large latitudinal and nearshore to offshore gradients are needed for the Arctic, where significant decline of carbonate ecosystems, habitats, and calcifying organisms are predicted over the next decade. The data will allow the USGS to map variations in ocean chemistry along designated tracks and will be used in models to predict future Arctic Ocean saturation states. 20100801 ground condition Complete None planned -167.2 -119.5 82.2 68.8 USGS Metadata Identifier USGS:41e6513f-cd57-4690-82e1-7f71555110dd Ocean Chemistry Ocean Acidification pCO2 total carbon carbon flux pH Salinity Temperature Data Categories for Marine Planning assessments water column features Marine Realms Information Bank (MRIB) Keywords chemical analysis chemical oceanography ocean acidification USGS Thesaurus chemical analysis marine chemistry ocean acidification Geography Arctic Ocean Canada Basin Alaska Canada Water seawater ocean surface Year 2010 none Please acknowledge the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center as a data source in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data set. Lisa Robbins U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Research Oceanographer physical

600 4th Street South

St. Petersburg Florida 33701 USA 727-803-8747 x3005 727-803-2032 727-803-2032 8am to 5pm M-F EST U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Microsoft Excel 2010 The QA/QC process looked for internal consistencies in the data by calculating the results using CO2SYS and back checking with the collected data. These data are collected along tracklines (2-D) and are therefore inherently incomplete. Geologic details between lines must be inferred. Seawater samples were collected from the sampling manifold of the shipboard flow-through seawater system in 300-mL borosilicate glass biochemical oxygen demand (BOD) bottles. Samples were preserved by adding 100 microliters (μL) of a saturated solution of mercuric chloride (HgCl2) and were sealed with a ground glass stopper lightly coated with Apiezon grease. Samples were transported to the USGS Carbon Chemistry Lab in St. Petersburg, Fla. Total alkalinity samples were analyzed using an Ocean Optics USB 2000 spectrophotometer, bromol cresol purple indicator dye, and the methods of Yao and Byrne (1998). Total carbon was analyzed using coulometric methods of Dickson and others (2007). Precision and accuracy for these methods was 1 μmol/kg for TA and TCO2. 20120312 1600 HLY1002_Discrete_Lab.csv Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20170315 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov 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 Vector Entity point 68 0.0000001 0.0000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000000000000000 298.257223563000030000 HLY1002_Discrete_Lab HLY1002_Discrete_Lab.csv USGS Date_(UTC) Date in Coordinated Universal Time (UTC) National Institute of Standards and Technology 8/6/2010 9/6/2010 dd/mm/yyyy Time_(UTC) Time (24-hour clock) in Coordinated Universal Time (UTC) National Institute of Standards and Technology 00:00 23:28 hh:mm Sample_ID Sample identification number. Sample numbers correspond to HLY1002_Discrete_Underway.csv Sample_ID numbers. USGS 3 307 Latitude_(Decimal_Degrees) Latitude in decimal degrees WGS 84 68.8 82.2 decimal degrees Longitude_(Decimal_Degrees) Longitude in decimal degrees WGS 84 -179.99 179.99 decimal degrees TSG_Temperature_(Celsius) Temperature, degrees Celsius, measured using the USCGC Healy's SBE3S instrument. USGS -1.5 8.3 Celsius Salinity_(PSU) Salt content, in Practical Salinity Units, measured using the USCGC Healy's SBE45 instrument. USGS 19.8 31.5 Practical Salinity Units (PSU) DIC_(µmol_kg-L-sw) Dissolved inorganic carbon content of seawater in micromoles per kilogram. USGS 1489 1980 micromoles per kilogram TA_(µmol_kg-L-sw) Total alkalinity seawater in micromoles per kilogram. USGS 1561 2219 micromoles per kilogram. Lisa Robbins U.S. Geological Survey St. Petersburg Coastal Marine and Science Center Physical

600 4th Street South

St. Petersburg Florida 33701 USA 727-803-8747 x3005 Downloadable Data This 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 (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. CSV .0478 http://pubs.usgs.gov/ds/??? Free, if obtained online. 20201013 Paul O. Knorr U.S. Geological Survey Research Associate mailing address

600 4th Street South

St. Petersburg Florida 33701 USA 727-803-8747 727-803-2032 pknorr@usgs.gov 8am to 5pm M-F EST FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time