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Florida Bay Air:Sea CO2 Exchange Maps

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Frequently-anticipated questions:

What does this data set describe?

Title: Florida Bay Air:Sea CO2 Exchange Maps
The maps show the air:sea CO2 exchange in Florida Bay in April, June, August, November, and December 2001 and April 2002.
  1. How should this data set be cited?

    Robert Halley (retired) Kim Yates, 2004, Florida Bay Air:Sea CO2 Exchange Maps.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -81.17
    East_Bounding_Coordinate: -80.125
    North_Bounding_Coordinate: 25.3
    South_Bounding_Coordinate: 24.75

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: Apr-2001
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: maps

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect_Spatial_Reference: Florida Bay

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 1. Longitudes are given to the nearest 1. Latitude and longitude values are specified in Degrees, minutes, and decimal seconds.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

  7. How does the data set describe geographic features?

    The CO2 exchange is measured in n.mol.m-2.s-1 (nanomoles per square meter per second). The categores are: less than 400, -400 - -200, -200 - 0, 0 - 200, 200 - 400, and greater than 400. Negative values indicate transfer of CO2 from air to sea. Positive values indicate transfer of CO2 from sea to air.
    Entity_and_Attribute_Detail_Citation: USGS

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • Robert Halley (retired)

  2. Who also contributed to the data set?

    The data was collected by Chris DuFore, Nancy Dewitt, Nathan Smiley, Keith Ludwig, and Jeff Dismukes of the USGS. The maps were created by Roney Rodriguez and modified by Iuri Herzfeld of the USGS.

  3. To whom should users address questions about the data?

    Chris DuFore
    U.S. Geological Survey
    600 4th Street South
    St. Petersburg, FL 33701

    727 803-8747 ext. 3041 (voice)

Why was the data set created?

The production and transport of biogenic carbonate sediments play a key role in developing mud banks and altering circulation patterns in Florida Bay. Accurate measurements of sediment accumulation and production rates are required to determine how these processes have changed during the last century in response to anthropogenic influences. Estimates of sediment accumulation rates and annual production rates based on standing crop and turnover of various calcifying species are available from previous research. Carbonate sedimentation and organic productivity (calcification, photosynthesis, and respiration) are most effectively determined from precise, in situ measurements of alkalinity, pH, temperature, conductivity, and air:sea CO2 and O2 gas fluxes.

The data collected were used to estimate the exchange of carbon dioxide in the surface waters of Florida Bay.

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: 2002 (process 1 of 1)
    Air:sea exchanges were measured using a direct chamber method with a LiCor 6252 Infrared CO2 gas analyzer. Carbon dioxide rates reflect the linear slope with the best Pearson product moment correlation coefficient (r2) calculated from a curve of approximately 900 data points.

    Any use of trade, product, or firm names is for descriptive purposes only and does not constitute endorsement by the U.S. Government

    Person who carried out this activity:

    Chris DuFore
    U.S. Geological Survey
    600 4th Street South
    St. Petersburg, FL 33701

    727 803-8747 ext. 3041 (voice)

  3. What similar or related data should the user be aware of?

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?

    All location data in the study was collected using a Precision Lightweight GPS Receiver (PLGR+96) with precise positioning service (PPS). The stated accuracy for this device is less than 52 ft (16m).

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    not available

  5. How consistent are the relationships among the observations, including topology?

    not available

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
The maps have not been reviewed for conformity with U.S. Geological Survey editorial standards

  1. Who distributes the data set? (Distributor 1 of 1)

    Heather S. Henkel
    U.S. Geological Survey
    600 Fourth St. South
    St. Petersburg, FL 33701

    727 803-8747 ext 3028 (voice)
    727 803-2030 (FAX)

  2. What's the catalog number I need to order this data set?

    Florida Bay Air:Sea Carbon Dioxide Exchange Maps

  3. What legal disclaimers am I supposed to read?

    No warrantees are implied or explicit for the data

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 21-Apr-2010
Metadata author:
Heather Henkel
U.S. Geological Survey
600 Fourth Street South
St. Petersburg, FL 33701

727 803-8747 ext 3028 (voice)
727 803-2030 (FAX)

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://sofia.usgs.gov/metadata/sflwww/FB_CO2_maps.faq.html>

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Wed Apr 21 10:25:28 2010