Oceanography The Official Magazine of
The Oceanography Society
Volume 21 Issue 04

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Volume 21, No. 4
Pages 34 - 45


Investigations of Air-Sea Gas Exchange in the CoOP Coastal Air-Sea Chemical Exchange Project

James B. Edson Michael D. DeGrandpreNelson Frew Wade R. McGillis
Article Abstract

The exchange of CO2 and other gases across the ocean-air interface is an extremely important component in global climate dynamics, photosynthesis and respiration, and the absorption of anthropogenically produced CO2. The many different mechanisms and properties that control the air-sea flux of CO2 can have large spatial and temporal variability, particularly in the coastal environment. The need for making short-time-scale and small-spatial-scale estimates of gas transfer velocity, along with the physical and chemical parameters that affect it, provided a framework for the field experiments of the Coastal Ocean Processes Program (CoOP) Coastal Air-Sea Chemical Exchange (CASCEX) program. As such, the CASCEX project provided an opportunity to develop some of the first in situ techniques to estimate gas fluxes using micrometeorological and thermal imagery techniques. The results reported from the CASCEX experiments represent the first step toward reconciling the indirect but widely accepted estimates of gas exchange with these more direct, higher-resolution estimates over the coastal ocean. These results and the advances in sensor technology initiated during the CASCEX project have opened up even larger regions of the global ocean to investigation of gas exchange and its role in climate change.


Edson, J.B., M.D. DeGrandpre, N. Frew, and W.R. McGillis. 2008. Investigations of air-sea gas exchange in the CoOP Coastal Air-Sea Chemical Exchange project. Oceanography 21(4):34–45, https://doi.org/10.5670/oceanog.2008.03.


Bandy, A.R., D.C. Thornton, F.H. Tu, B.W. Blomquist, W. Nadler, G.M. Mitchell, and D.H. Lenschow. 2002. Determination of the vertical flux of dimethyl sulfide by eddy correlation and atmospheric pressure ionization mass spectrometry (APIMS). Journal of Geophysical Research 107(D24):4743, doi:10.1029/2002JD002472.

Berg, P., H. Røy, F. Janssen, V. Meyer, B.B. Jørgensen, M. Huettel, and D. deBeer. 2003. Oxygen uptake by aquatic sediments measured with a novel non-invasive eddy-correlation technique. Marine Ecology Progress Series 261:75­83.

Borges, A.V. 2005. Do we have enough pieces of the jigsaw to integrate CO2 fluxes in the coastal ocean? Estuaries 28:3–27.

Borges, A.V., and R. Wanninkhof. 2007. Preface: 37th International Liege Colloquium on Ocean Dynamics, Liege, Belgium, May 2–6, 2005, 5th International Symposium on Gas Transfer at Water Surfaces. Journal of Marine Systems 66:1–3.

Broecker, W.S., and T.-H. Peng, 1982. Tracers in the Sea. Eldigio Press, Palisades, NY, 690 pp.

Broecker, W.S., J.R. Ledwell, T. Takahashi, R. Weiss, L. Merlivat, L. Memery, T.H. Peng, B. Jähne, and K.O. Munnich. 1986. Isotopic versus micrometeorologic ocean CO2 fluxes: A serious conflict. Journal of Geophysical Research 91:10,517–10,527.

Brutsaert, W., and G.H. Jirka. 1984. Gas transfer at water surfaces. Reidel Publishing, Hingham, MA, 639 pp.

Dacey, J.W.H., J.B. Edson, P.H. Holland, and W.R. McGillis. 1999. In situ estimation of air-sea gas transfer using DMS. Pp. 425–426 in Proceedings of the 13th Symposium on Boundary Layers and Turbulence, Dallas, TX, American Meteorological Society.

DeGrandpre, M.D., T.R. Hammar, S.P. Smith, and F.L. Sayles. 1995. In situ measurements of seawater pCO2. Limnology and Oceanography 40:969–975.

DeGrandpre, M.D., T.R. Hammar, and C.D. Wirick. 1998. Short-term pCO2 and O2 dynamics in California coastal waters. Deep-Sea Research Part II 45:1,557–1,575.

Donelan, M.A., and W.M. Drennan. 1995. Direct field measurements of the flux of carbon dioxide. Pp. 677–683 in Air-Water Gas Transfer. B. Jähne and E.C. Monahan, eds, AEON Verlag & Studio, Hanau, Germany.

Donelan M.A., W. Drennan, E. Saltzman, and R. Wanninkhof. 2002. Gas Transfer at Water Surfaces. Geophysical Monograph Series Volume 127, American Geophysical Union, Washington, DC, 383 pp.

Ducklow, H.W., and S.L. McCallister. 2004. The biogeochemistry of carbon dioxide in the coastal oceans. Pp. 269-315 in The Sea vol. 13, The Global Coastal Ocean: Multiscale Interdisciplinary Processes, A. R. Robinson, K. Brink, and B. J. Rothschild, eds, Harvard University Press, Cambridge, MA.

Edson, J.B. 2001. Sensors for micrometeorological flux measurements. Pp. 2,751–2,759 in Encyclopedia of Ocean Sciences, vol 5, J. Steele, S. Thorpe, and K. Turekian, eds, Academic Press, London.

Edson, J.B., A.A. Hinton, K.E. Prada, J.E. Hare, and C.W. Fairall. 1998. Direct covariance flux estimates from mobile platforms at sea. Journal of Atmospheric and Oceanic Technology 15:547–562.

Edson, J.B., C.J. Zappa, J.A. Ware, W.R. McGillis, and J.E. Hare. 2004. Scalar flux profile relationships over the open ocean. Journal of Geophysical Research 109(C08S09), doi:10.1029/2003JC001960.

Fairall, C.W., E.F. Bradley, J.E. Hare, A.A. Grachev, and J.B. Edson. 2003. Bulk parameterization of air-sea fluxes: Updates and verification for the COARE algorithm. Journal of Climate 16:571-591.

Fairall, C.W., E.F. Bradley, D.P. Rogers, J.B. Edson, and G.S. Young. 1996. Bulk parameterization of air-sea fluxes for TOGA COARE. Journal of Geophysical Research 101:3,747–3,764.

Frew, N., J. Edson, W. McGillis, S. McKenna, R. Nelson, T. Hara, B. Uz, U. Schimpf, E. Bock, B. Jähne and H. Haußecker. 2004. Air-sea gas transfer: Its dependence on wind stress, small-scale roughness and surface films. Journal of Geophysical Research 109(C08S17), doi:10.1029/2003JC002131.

Frew, N.M., D.M. Glover, E.J. Bock, and S.J. McCue. 2007. A new approach to estimation of global air-sea gas transfer velocity fields using dual-frequency altimeter backscatter. Journal of Geophysical Research 112(C11003), doi:10.1029/2006JC003819.

Fuehrer, P.L., and C.A. Friehe. 2002. Flux corrections revisited. Boundary-Layer Meteorology 102:415–457.

Garbe, C.S., R.A. Handler, and B. Jähne. 2007. Transport at the Air-Sea Interface: Measurements, Models and Parameterizations. Springer Verlag, Berlin, 320 pp.

Hara, T., E.J. Bock, J.B. Edson, and W.R. McGillis. 1998. Observations of short wind-waves in coastal waters. Journal of Physical Oceanography 28:1,425–1,438.

Hare, J.E., C.W. Fairall, W.R. McGillis, J.B. Edson, B. Ward, and R. Wanninkhof. 2004. Evaluation of the National Oceanic and Atmospheric Administration/Coupled-Ocean Atmospheric Response Experiment (NOAA/COARE) air-sea gas transfer parameterization using GasEx data. Journal of Geophysical Research 109(C08S11), doi:10.1029/2003JC001831.

Haußecker, H. 1996. Measurements and simulations of small scale exchange processes at the ocean surface. PhD Thesis, University of Heidelberg, Heidelberg, Germany.

Hintsa, E.J., J.W.H. Dacey, W.R. McGillis, J.B. Edson, C.J. Zappa, and H.J. Zemmelink. 2004. Sea-to-air fluxes from measurements of the atmospheric gradient of dimethylsulfide and comparison with simultaneous relaxed eddy accumulation measurements. Journal of Geophysical Research 109(C01026), doi:10.1029/2002JC001617.

Huebert, B.J., B.W. Blomquist, J.E. Hare, C.W. Fairall, J.E. Johnson, and T.S. Bates. 2004. Measurement of the sea-air DMS flux and transfer velocity using eddy correlation. Geophysical Research Letters 31(L23113), doi:10.1029/2004GL021567.

Jähne, B. 1985. On transfer processes at a free air-water interface. Habilitation Thesis, Faculty of Physics and Astronomy, University of Heidelberg, Heidelberg, Germany.

Jähne, B., and H. Haußecker. 1998. Air-water gas exchange. Annual Review of Fluid Mechanics 30:443–468.

Jähne B., and E.C. Monahan. 1995. Air-Water Gas Transfer: Selected Papers from the Third International Symposium on Air-Water Gas Transfer. Aeon Verlag & Studio, Hanau, Germany, 900 pp.

Jones, E.P., and S.D. Smith. 1977. A first measurement of sea-air CO2 flux by eddy correlation. Journal of Geophysical Research 82:5,990–5,992.

Liss, P.S. 1983. Gas transfer: Experiments and geochemical implications. Pp. 241–299 in Air-sea Exchange of Gases and Particles, P.S. Liss and W.G. Slinn, eds, Reidel Publishing, Dordrecht, The Netherlands.

Liss, P.S., H. Heimann, and W. Roether. 1988. Tracers of air-sea gas exchange [and discussion]. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences 325:93–103.

Liss, P.S., and L. Merlivat. 1986. Air-sea gas exchange rates: Introduction and synthesis. Pp. 113–129 in The Role of Air-Sea Exchange in Geochemical Cycling, NATO ASI Series, P. Buat-Ménard, ed, Springer.

Liss, P.S., and P.G. Slater. 1974. Flux of gases across the air-sea interface. Nature 247:181–184.

Marandino, C.A., W.J. De Bruyn, S.D. Miller, and E.S. Saltzman. 2007. Eddy correlation measurements of the air/sea flux of dimethylsulfide over the North Pacific Ocean. Journal of Geophysical Research 112(D03301), doi:10.1029/2006JD007293.

McGillis, W.R., J.W.H. Dacey, N.M. Frew, E.J. Bock, and R.K. Nelson. 2000. Water-air flux of dimethylsulfide. Journal of Geophysical Research 105:1,187–1,193.

McGillis, W.R., J.B. Edson, J.D. Ware, J.W.H. Dacey, J.E. Hare, C.W. Fairall, and R. Wanninkhof. 2001a. Carbon dioxide flux techniques performed during GasEx-98. Journal of Marine Chemistry 75:267–280.

McGillis, W.R., J.B. Edson, J.E. Hare, and C.W. Fairall. 2001b. Direct covariance air-sea CO2 fluxes. Journal of Geophysical Research 106:16,729–16,745.

McGillis, W.R., W.E. Asher, R. Wanninkhof, A.T. Jessup, and R.A. Feely. 2004a. Air-sea exchange. Journal of Geophysical Research 109(C8), doi:10.1029/2003JC002605.

McGillis, W.R., J.B. Edson, C.J. Zappa, J.D. Ware, S.P. McKenna, E.A. Terray, J.E. Hare, C.W. Fairall, W. Drennan, M. Donelan, and others. 2004b. Air-sea CO2 exchange in the equatorial Pacific. Journal of Geophysical Research 109(C08S02), doi:10.1029/2003JC002256.

Peng, T.-H., W.S. Broecker, G.G. Mathieu, Y.H. Li, and A.E. Bainbridge. 1979. Radon evasion rates in the Atlantic and Pacific oceans as determined during the GEOSECS program. Journal of Geophysical Research 84:2,471–2,486.

Schimpf, U., C. Garbe, and B. Jähne. 2004. Investigation of transport processes across the sea surface microlayer by infrared imagery. Journal of Geophysical Research 109(C08S13), doi:10.1029/2003JC001862.

Smith, S.D., and E.P. Jones. 1985. Evidence for wind-pumping of air-sea exchange based on direct measurements of CO2 fluxes. Journal of Geophysical Research 90:869–875.

Wanninkhof, R. 1992. Relationship between wind speed and gas exchange over the ocean. Journal of Geophysical Research 97:7,373–7,382.

Wanninkhof, R., and K. Thoning. 1993. Measurement of fugacity of CO2 in surface water using continuous and discrete sampling methods. Marine Chemistry 44:189–204.

Webb, E.K., G.I. Pearman, and R. Leuning. 1980. Correction of flux measurements for density due to heat and water vapor transport. Quarterly Journal of the Royal Meteorological Society 106:85–100.

Weseley, M.L., D.R. Cook, R.L. Hart, and R.M. Williams, 1982. Air-sea exchange of CO2 and evidence for enhanced upward fluxes. Journal of Geophysical Research 87:8,827–8,832.

Wilhelms, S.C., and J.S. Gulliver. 1991. Proceedings of the Second International Symposium on Gas Transfer at Water Surfaces. ASCE Publications, New York, 797 pp.

Woolf, D.K. 2005. Parametrization of gas transfer velocities and sea-state dependent wave breaking. Tellus 57B(2):87–94.

Zemmelink, H.J., J. W.H. Dacey, E.J. Hintsa, and W.R. McGillis, W.W.C. Gieskes, W. Klaassen, H.W. de Groot, and H.J.W. de Baar. 2004. Fluxes and gas transfer rates of the biogenic trace gas DMS derived from atmospheric gradients. Journal of Geophysical Research 109(C08S10), doi:10.1029/2003JC001795.

Zemmelink, H.J., W.W.C. Gieskes, P.M. Holland, and J.W.H. Dacey. 2002. Preservation of atmospheric dimethyl sulphide samples on Tenax in sea-to-air flux measurements. Atmospheric Environment 36:911–916.

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