Andrew W. Stevens Guy Gelfenbaum Jamie MacMahan Ad J.H.M. Reniers Edwin P. Elias Christopher R. Sherwood Emily M. Carlson 2017 NetCDF files data release DOI:10.5066/F7NG4NS1 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/F7NG4NS1 https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=mcr13_drifter_data.zip Andrew W. Stevens Guy Gelfenbaum Jamie MacMahan Ad J.H.M. Reniers Edwin P. Elias Christopher R. Sherwood Emily M. Carlson 2017 data release DOI:10.5066/F7NG4NS1 Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/F7NG4NS1 Lagrangian surface currents were measured using drifters equipped with global navigation satellite system (GNSS) receivers. A total of 8 drifter deployments were performed between May 25 and June 8, 2013. For each deployment, drifters were released within the MCR and their positions were recorded until the drifters were recovered. The average duration of the drifter deployments varied between 1.6 h and 17.2 h and the number of drifters released in a deployment ranged between 11 and 84. The initial positions and timing of the release of the drifters relative to the tidal cycle varied throughout the drifter deployments. Digital files containing the drifter data from each deployment are available in NetCDF format. These drifter deployments were conducted as a part of a larger investigation into the hydrodynamics of the mouth of the Columbia River, Oregon and Washington, in 2013. Additional information about the field activities from which these data were derived are available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S0313WO Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20130525 20130608 ground condition at time data were collected Complete None planned] -125.177190 -123.850667 46.434430 44.680610 USGS Metadata Identifier USGS:5907955fe4b0fc4e448eb011 ISO 19115 Topic Category Oceans geoscientificInformation Data Categories for Marine Planning Water Column Features USGS Thesaurus Ocean Circulation Marine Realms Information Bank (MRIB) keywords Physical Oceanography Currents Geographic Names Information System (GNIS) Columbia River Pacific County Clatsop County State of Washington State of Oregon None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey and National Park Service as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes. Andrew W. Stevens U.S. Geological Survey, Pacific Coastal and Marine Science Center Oceanographer mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7424 831-427-4748 astevens@usgs.gov https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=drifter_overview_1.png&allowOpen=true Plot of drifter tracks from deployments 1-4. PNG https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=drifter_overview_2.png&allowOpen=true Plot of drifter tracks from deployments 5-8. PNG Matlab version 9.0.0.341360 running on Microsoft Windows 7 Data were reviewed to ensure that only data points that represent the period that each drifter was free-floating are included, and extraneous points were removed (such as points on land or on the research vessel). All data fall within expected ranges. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Horizontal positional accuracy provided by the manufacturer is 10 m. The drifters were each constructed with a 0.5-m section of standard dimension ratio 35 polyvinyl chloride pipe capped at both ends. Holes were drilled into the end caps and a 2.27 kg weight was attached to the bottom of the drifter. Foam collars were attached around the outer diameter of the top caps to provide buoyancy for the drifters. Waterproof cases attached to the top of the drifters housed two types of GNSS receivers. Positioning of the drifters was recorded at 1-Hz intervals using an internally-logging Genie GT-31 L/1 GNSS receiver. Each drifter was also equipped with a SPOT GNSS device that reported drifter positions at 5-min intervals via satellite. The positions from the SPOT GNSS were used in the event that the drifter was not recovered. 20130301 A total of 8 drifter deployments were performed between May 25 and June 8, 2013. For each deployment, drifters were released within the mouth of the Columbia River and their positions were recorded until the drifters were recovered. Deployment and recovery operations were performed from the R/V Parke Snavely and two personal watercraft. 20130608 Data were imported into Matlab to parse the data from one data file into individual drifter deployments. Distance, azimuth and drifter velocity were calculated using the GPS fixes. The data from each deployment were accumulated into NetCDF files for distribution. 20160617 Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 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 Point Point 4479785 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 NetCDF files are self-contained and attribute information may be found in the header of the file itself. The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov This zip file (mcr13_drifter_data.zip) contains 8 individual NetCDF files, one for each drifter deployment. The files names represent drifter deployments beginning on MM-DD-YY (local time). Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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. NetCDF Matlab 9.0.0.341360 Zip file contains drifter data in NetCDF format zip archive 189.16 https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=mcr13_drifter_data.zip https://doi.org/10.5066/F7NG4NS1 Data may be accessed and downloaded via the Internet png Matlab 9.0.0.341360 PNG image showing drifter tracks for deployments 1-4 none 1.21 https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=drifter_overview_1.png https://doi.org/10.5066/F7NG4NS1 Data may be accessed and downloaded via the Internet png Matlab 9.0.0.341360 PNG image showing drifter tracks for deployments 5-8 none 1.93 https://www.sciencebase.gov/catalog/file/get/5907955fe4b0fc4e448eb011?name=drifter_overview_2.png https://doi.org/10.5066/F7NG4NS1 Data may be accessed and downloaded via the Internet None These data can be viewed with any text editor software. 20201019 Andrew W. Stevens U.S. Geological Survey, Pacific Coastal and Marine Science Center Oceanographer mailing and physical

2885 Mission Street

Santa Cruz CA 95060 United States of America 831-460-7424 astevens@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998