A technique to measure the gas exchange coefficient (transfer velocity) from a three-dimensional unsteady tracer cloud on large water bodies is described. Arguments based on first principles are presented in support of the technique. For this reason, the measurement uncertainty is apparent and can be quantified analytically. The dual gas exchange measurement technique was tested and results are discussed through computational experiments that simulate a tracer cloud and incorporate random sampling. Measurements of gas exchange coefficient are undertaken in Chequamegon Bay of Lake Superior. The intensive sampling regression technique developed was used in these measurements, and a minimum percent uncertainty was used to determine an optimum analysis period. Results were determined with a 4 to 9 hour sampling period, with no preliminary mixing period.
|Original language||English (US)|
|Title of host publication||Gas Transfer at Water Surfaces, 2002|
|Editors||W.M. Drennan, E.S. Saltzman, M.A. Donelan, R. Wanninkhof|
|Publisher||Blackwell Publishing Ltd|
|Number of pages||7|
|State||Published - 2001|
|Name||Geophysical Monograph Series|
Bibliographical noteFunding Information:
This work is the result of research sponsored by the Minnesota Sea Grant College Program supported by the NOAA Office of Sea Grant, Department of Commerce, under Grant No. DOC/NOAA-86AA-D-5G112. The authors would also like to thank the Apostle Islands National Park Service stationed in Bayfield, Wisconsin, for the use of their boat and captain throughout the field experiments.
Acknowledgements. This work is the result of research sponsored by the Minnesota Sea Grant College Program supported by the NOAA Office of Sea Grant, Department of Commerce, under Grant No. DOC/NOAA-86AA-D-5G112. The authors would also Table 4. Field experiment results with dual tracers and intensive sampling U* Uio Time Total Date (m/s) (m/s) Analyzed Experiments (hrs) (hrs)
© 2002 by the American Geophysical Union.