Estuaries and Coasts

, Volume 34, Issue 6, pp 1103–1116 | Cite as

On Factors Controlling Air–Water Gas Exchange in a Large Tidal River

Article

Abstract

Air–water gas exchange is an important process in aquatic systems, including tidal rivers and estuaries. While there are now reliable and routine methods for determining gas exchange over a range of temporal and spatial scales in the ocean and these measurements have resulted in widely used wind speed parameterizations to calculate air–sea gas exchange, the same has not been true for coastal inland waterways. Some studies have suggested that this difference is methodological, while others point to the existence of additional drivers for gas exchange besides wind in rivers and estuaries. Here, we present gas transfer velocities measured in the tidal Hudson River with a method widely used in oceanic studies, the 3He/SF6 dual tracer technique. Airside and waterside forcings were determined with an anemometer and an acoustic Doppler current profiler, respectively. The results confirm that wind is the dominant driver of gas exchange in the tidal Hudson River, with negligible contribution from bottom-generated turbulence. Furthermore, a parameterization between wind speed and gas exchange developed for the ocean is able to predict gas exchange in this environment with high accuracy. It is hoped that by transferring methodology used in oceanic studies to rivers and estuaries, robust data can be obtained that will eventually allow development of widely applicable relationships between easily measured environmental variables and gas exchange in tidal inland waters.

Keywords

Air–water gas exchange 3He/SF6 Hudson River 

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Copyright information

© Coastal and Estuarine Research Federation 2011

Authors and Affiliations

  • David T. Ho
    • 1
  • Peter Schlosser
    • 2
    • 3
    • 4
  • Philip M. Orton
    • 2
    • 5
  1. 1.Department of OceanographyUniversity of HawaiiHonoluluUSA
  2. 2.Lamont-Doherty Earth ObservatoryColumbia UniversityPalisadesUSA
  3. 3.Department of Earth and Environmental SciencesColumbia UniversityNew YorkUSA
  4. 4.Department of Earth and Environmental EngineeringColumbia UniversityNew YorkUSA
  5. 5.Department of Civil, Environmental and Ocean EngineeringStevens Institute of TechnologyHobokenUSA

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