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Boundary-layer dynamics and its influence on atmospheric chemistry at Summit, Greenland
AbstractSonic anemometer turbulence measurements were made at Summit, Greenland during summer 2004 and spring 2005. These measurements allow for the characterization of the variability of the atmospheric boundary layer at this site by describing seasonal and diurnal changes in sensible heat flux and boundary layer stability as well as providing estimates of mixing layer height. Diurnal sensible heat fluxes at Summit ranged from −18 to −2Wm−2 in the spring and from −7 to +10Wm−2 in the summer. Sustained stable surface layer conditions and low wind speeds occured during the spring but not during the summer months. Unstable conditions were not observed at Summit until late April. Diurnal cycles of convective conditions during the daytime (0700–1700h local time) were observed throughout July and August. Boundary layer heights, which were estimated for neutral to stable conditions, averaged 156m for the spring 2005 observations. Comparisons of the boundary layer characteristics of Summit with those from South Pole, Antarctica, provide possible explanations for the significant differences in snowpack and surface-layer chemistry between the two sites.
Boundary-layer dynamics and its influence on atmospheric chemistry at Summit, Greenland
AbstractSonic anemometer turbulence measurements were made at Summit, Greenland during summer 2004 and spring 2005. These measurements allow for the characterization of the variability of the atmospheric boundary layer at this site by describing seasonal and diurnal changes in sensible heat flux and boundary layer stability as well as providing estimates of mixing layer height. Diurnal sensible heat fluxes at Summit ranged from −18 to −2Wm−2 in the spring and from −7 to +10Wm−2 in the summer. Sustained stable surface layer conditions and low wind speeds occured during the spring but not during the summer months. Unstable conditions were not observed at Summit until late April. Diurnal cycles of convective conditions during the daytime (0700–1700h local time) were observed throughout July and August. Boundary layer heights, which were estimated for neutral to stable conditions, averaged 156m for the spring 2005 observations. Comparisons of the boundary layer characteristics of Summit with those from South Pole, Antarctica, provide possible explanations for the significant differences in snowpack and surface-layer chemistry between the two sites.
Boundary-layer dynamics and its influence on atmospheric chemistry at Summit, Greenland
Cohen, Lana (author) / Helmig, Detlev (author) / Neff, William D. (author) / Grachev, Andrey A. (author) / Fairall, Christopher W. (author)
Atmospheric Environment ; 41 ; 5044-5060
2006-06-29
17 pages
Article (Journal)
Electronic Resource
English
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