Title of article :
Boundary-layer dynamics and its influence on atmospheric chemistry at Summit, Greenland
Author/Authors :
Lana Cohen، نويسنده , , Detlev Helmig، نويسنده , , William D. Neff، نويسنده , , Andrey A. Grachev، نويسنده , , Christopher W. Fairall، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Pages :
17
From page :
5044
To page :
5060
Abstract :
Sonic 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 −2 W m−2 in the spring and from −7 to +10 W m−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 (0700–1700 h local time) were observed throughout July and August. Boundary layer heights, which were estimated for neutral to stable conditions, averaged 156 m 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.
Keywords :
Surface layer chemistry , Polar boundary layer , Surface-atmosphere fluxes , Seasonal Changes
Journal title :
Atmospheric Environment
Serial Year :
2007
Journal title :
Atmospheric Environment
Record number :
760367
Link To Document :
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