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      Lake-size dependency of wind shear and convection as controls on gas exchange

      Read, Jordan S.; Hamilton, David P.; Desai, Ankur R.; Rose, Kevin; MacIntyre, Sally; Lenters, John D.; Smyth, Robyn L.; Hanson, Paul C.; Cole, Jonathan J.; Staehr, Peter A.; Rusak, James A.; Pierson, Donald C.; Brookes, Justin D.; Laas, Alo; Wu, Chin H.
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      Hamilton lake-size 2012.pdf
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      DOI
       10.1029/2012GL051886
      Link
       onlinelibrary.wiley.com
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      Read, J. S., Hamilton, D. P., Desai, A. R., Rose, K. C., MacIntyre, S., Lenters, J. D., & Wu, C. H. (2012). Lake-size dependency of wind shear and convection as controls on gas exchange. Geophysical Research Letters, 39(9), L09405.
      Permanent Research Commons link: https://hdl.handle.net/10289/7415
      Abstract
      High-frequency physical observations from 40 temperate lakes were used to examine the relative contributions of wind shear (u∗) and convection (w∗) to turbulence in the surface mixed layer. Seasonal patterns of u∗ and w∗ were dissimilar; u∗ was often highest in the spring, while w∗ increased throughout the summer to a maximum in early fall. Convection was a larger mixed-layer turbulence source than wind shear (u∗/w∗ < 0.75) for 18 of the 40 lakes, including all 11 lakes <10 ha. As a consequence, the relative contribution of convection to the gas transfer velocity (k, estimated by the surface renewal model) was greater for small lakes. The average k was 0.54 m day⁻¹ for lakes <10 ha. Because u∗ and w∗ differ in temporal pattern and magnitude across lakes, both convection and wind shear should be considered in future formulations of lake-air gas exchange, especially for small lakes.
      Date
      2012
      Type
      Journal Article
      Publisher
      American Geophysical Union (AGU)
      Rights
      This article is published in the Geophysical Research Letters. © 2012 American Geophysical Union (AGU).
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      • Science and Engineering Papers [3122]
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