Oceanographic Data from Winter and Spring Circulation and Sediment Transport Studies in the Hudson Shelf Valley collected in December-April (1999/2000) and April-June 2006

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Frequently anticipated questions:


What does this data set describe?

Title:
Oceanographic Data from Winter and Spring Circulation and Sediment Transport Studies in the Hudson Shelf Valley collected in December-April (1999/2000) and April-June 2006
Abstract:
The U.S. Geological Survey (USGS) conducted field experiments to understand the transport of sediments and associated contaminants in the Hudson Shelf Valley, offshore of New York. The valley is a sink and potential conduit for the movement of sediments and associated contaminants across the shelf. A winter experiment (1999-2000) investigated the role of winter storms in transporting sediments in the valley. A spring experiment (2006) explored transport during the period of spring runoff from the Hudson River. The spring experiment was carried out in cooperation with the Lagrangian Transport and Tracer Experiment (LATTE). The original metadata had a link (marine.rutgers.edu/cool/latte/latte2006.htm) that is no longer valid. A substitute link was not found. For more information on the USGS field operations associated with data collection: http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=99006 http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=00054 http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=06013 http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=06023
  1. How might this data set be cited?
    B.Butman, Martini, M.A., and Montgomery, E.T., 2008, Oceanographic Data from Winter and Spring Circulation and Sediment Transport Studies in the Hudson Shelf Valley collected in December-April (1999/2000) and April-June 2006: U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: Applies to the data distribution site for an experiment.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.8511
    East_Bounding_Coordinate: -73.2402
    North_Bounding_Coordinate: +40.3908
    South_Bounding_Coordinate: +39.9413
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Dec-1999
    Ending_Date: 21-Jun-2006
    Currentness_Reference:
    Ground condition of data collection; two deployments in the same region in different seasons, separated by 6 years.
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 9999
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • B.Butman
    • M.A. Martini
    • E.T. Montgomery
  2. Who also contributed to the data set?
    Funding was provided by the U.S. Geological Survey Coastal and Marine Geology Program.
  3. To whom should users address questions about the data?
    Bradford Butman
    U.S. Geological Survey
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center
    Woods Hole, Massachusetts

    508 548-8700 x2212 (voice)
    bbutman@usgs.gov

Why was the data set created?

To distribute the oceanographic measurements collected by instruments deployed during this experiment. This information on the physics of flow in submarine canyons will help improve models of circulation and sediment transport and to describe seasonal dynamics. Data collected includes: pressure, current velocity, wave properties, turbidity, water temperature salinity and pressure. The locations, deployment depths, sensor type and parameters measured during the deployment are presented in the tables displayed by the Basic Sampling Interval links for the two seasons on the data server (http://stellwagen.er.usgs.gov/hudson_svalley.html).

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2006 (process 1 of 6)
    FIELD PROGRAM: During the winter experiment in 1999-2000, six instrumented tripods (IDs 595, 597, 599, 601, 603 and 604) were deployed in and around the valley with upward looking ADCPs to capture the currents in the whole water column and Benthic Acoustic Stress Sensors (BASS) to quantify near-bottom water flow and sediment concentration. Adjacent moorings at the first 5 sites (IDs 594, 596, 598, 600, and 602) had Seabird Instruments at various depths, providing complementary data on water temperature, salinity, density and attenuation. During the spring experiment in 2006, one tripod (ID 816) was deployed at the same location 595 had occupied in winter 2000 with upward looking ADCPs to capture the currents in the whole water column and BASS to capture near-bottom flow and sediment concentration. A mooring and tripod (IDs 817, 818) were deployed further down the canyon to make the same suite of measurements described above. Each deployment was intended to obtain measurements to describe seasonal dynamics. Processing occurred in 2000 and 2006.
    Date: 2007 (process 2 of 6)
    DATA PROCESSING: Data processing was conducted using the proprietary software for each instrument, and (or) specialized software developed by the USGS. The proprietary software was often used to download data from the instruments and export the data to ASCII-files. Post-processing of the raw binary or ASCII files was accomplished using USGS software developed in the MATLAB (http://www.mathworks.com/) programming language. Data were first decoded and calibrated from instrument-specific formats and units to the EPIC-standard NetCDF format (http://www.pmel.noaa.gov/epic/) and scientific units. Data were carefully checked for instrument malfunctions and then edited. The beginning and end of each data series were truncated to remove data collected out of water. The data were carefully checked at each stage of processing. After final editing, the best basic version of the data file includes all variables recorded at the basic sampling interval with valid metadata. Best basic versions of all data files in NetCDF format are provided. Person who carried out this activity:
    Ellyn Montgomery
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    United States

    508-457-8700 x2356 (voice)
    emontgomery@usgs.gov
    Date: 12-Jul-2016 (process 3 of 6)
    Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 12-Jul-2016 (process 4 of 6)
    Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The links to the experiment page had to be fixed in the Identification_Information section and the Distribution_Information section. Fixed the online link to a cross-reference. In the case of the depth resolution, the value of 9999 was entered to indicate that the original metadata did not contain the required information. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 20-Jul-2018 (process 5 of 6)
    USGS Thesaurus keywords added to the keyword section. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 08-Sep-2020 (process 6 of 6)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Montgomery, E.T., Martini, M.A., Lightsom, F.L., and Butman, Bradford, 2009, Documentation of the U.S. Geological Survey Oceanographic Time Series Measurement Database: Open-File Report 2007-1194, U.S. Geological Survey, Reston, VA.

    Online Links:

    Butman, B., Alexander, P.S., Harris, C.K., Traykovski, P.A., tenBrink, M.B., F.S.Lightsom, and Martini, M.A., 2003, Oceanographic Observations in the Hudson Shelf Valley, December 1999 - April 2000: Data Report: Open-File Report 2002-017, U.S. Geological Survey, Reston, VA.

    Online Links:


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    The deployment positions were obtained from the navigation systems of the R/V Oceanus (1999-2000) and R/V Samantha Miller (2006). The accuracy is to within 10m. The horizontal datum set on the navigation system is uknown.
  3. How accurate are the heights or depths?
    Bottom-mounted sensors have instrument_height attributes (meters above bottom) were measured prior to deployment. The sensor height above bottom is accurate to within 1 cm, but the depth (representing the initial measurement depth) is only accurate to about 1 meter due to tidal fluctuations and use of nominal water depth. If the sensor acquires data in bins by depth (ADCP, PCADP, AQD), those depths are accurate to a few centimeters relative to each other. Sedimentation or scouring around the platform may change the vertical position over the course of a deployment by as much as 20 cm. In this experiment, the instruments listed at 1 meter depth are mounted on the bottom of the surface buoy hull. In storms, waves can cause changes in depth relative to the changing water surface, so are accurate to 0.5 meters. The design of these moorings maintains the depths of the other (deeper) instruments to an accuracy of +/-1 meter. There are no sensors on the moored instruments to verify the depth, so these depths should be considered nominal.
  4. Where are the gaps in the data? What is missing?
    Complete data records were recovered from all sensors on all platforms for both the winter and spring deployments. The data have been edited to remove outlying points per normal processing procedure and data recorded when the instruments were out of the water (before and after deployment).
  5. How consistent are the relationships among the observations, including topology?
    Data are logically consistent

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset. Biological fouling may degrade the transmission measurements after several months of deployment. Organisms grow on the lenses and gradually block light transmission, which results in a gradual upward drift of the beam attenuation coefficient. The attenuation data nor the optical backscatter data have not been corrected for biological fouling and should be interpreted with care.
  1. Who distributes the data set? (Distributor 1 of 1)
    Ellyn Montgomery
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA
    United States

    508-457-8700 x2356 (voice)
    emontgomery@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data available from http://stellwagen.er.usgs.gov/hudson_svalley.html.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The user's computer must have software to read netCDF files or import OPeNDAP.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Ellyn T. Montgomery
U.S. Geological Survey
384 Woods Hole Road
Woods Hole, MA
United States

(508) 457-8700 x2356 (voice)
emontgomery@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/stellwagen/hsv_experimentmeta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:42 2021