Buoyancy flux, turbulence, and the gas transfer coefficient in a stratified lake

作     者：MacIntyre, Sally Jonsson, Anders Jansson, Mats Aberg, Jan Turney, Damon E. Miller, Scott D. 

作者机构：Univ Calif Santa Barbara Dept Ecol Evolut & Marine Biol Santa Barbara CA 93106 USA Umea Univ Dept Ecol & Environm Sci SE-90187 Umea Sweden SUNY Albany Atmospher Sci Res Ctr Albany NY 12203 USA Univ Calif Santa Barbara Earth Res Inst Santa Barbara CA 93106 USA 

出 版 物：《GEOPHYSICAL RESEARCH LETTERS》 (地球物理学研究快报)

年 卷 期：2010年第37卷第24期

页      面：[np]页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：U.S. National Science Foundation [DEB0640953, DEB0919603, ARC0714085] Swedish Research Council Kempe Foundation Ebba and Sven Schwarts Foundation Langman Foundation Direct For Biological Sciences Division Of Environmental Biology Funding Source: National Science Foundation Division Of Environmental Biology Direct For Biological Sciences Funding Source: National Science Foundation 

主　　题：gas transfer coefficient turbulence buoyancy flux 

摘      要：Gas fluxes from lakes and other stratified water bodies, computed using conservative values of the gas transfer coefficient k(600), have been shown to be a significant component of the carbon cycle. We present a mechanistic analysis of the dominant physical processes modifying k(600) in a stratified lake and resulting new models of k(600) whose use will enable improved computation of carbon fluxes. Using eddy covariance results, we demonstrate that i) higher values of k(600) occur during low to moderate winds with surface cooling than with surface heating;ii) under overnight low wind conditions k(600) depends on buoyancy flux beta rather than wind speed;iii) the meteorological conditions at the time of measurement and the inertia within the lake determine k(600);and iv) eddy covariance estimates of k(600) compare well with predictions of k(600) using a surface renewal model based on wind speed and beta. Citation: MacIntyre, S., A. Jonsson, M. Jansson, J. Aberg, D. E. Turney, and S. D. Miller (2010), Buoyancy flux, turbulence, and the gas transfer coefficient in a stratified lake, Geophys. Res. Lett., 37, L24604, doi:10.1029/2010GL044164.