|
|
We recorded the burial times of temperature sensors mounted on a specially constructedtower to determine snow accumulation during individual storms in the summit caldera of MountWrangell, Alaska, USA, (628 N, 1448W; 4100ma.s.l.) during the accumulation year June 2005 to June2006. The experiment showed most of the accumulation occurred in episodic large storms, and half ofthe total accumulation was delivered in late summer. The timing of individual events correlated wellwith storms recorded upwind, at Cordova, the closest Pacific coastal weather station (200kmsouthsoutheast), although the magnitude of events showed only poor correlation. Hence, snow accumulation at Mount Wrangell appears to be a reflection of synoptic-scale...
|
Abstract Monoterpene and isoprene secondary organic aerosol (SOA) tracers are reported for the first time in an Alaskan ice core to better understand the biological source strength before and after the industrial revolution in the Northern Hemisphere. We found significantly high concentrations of monoterpene- and isoprene-SOA tracers (e.g., pinic, pinonic, and 2-methylglyceric acids, 2-methylthreitol and 2-methylerythritol) in the ice core, which show historical trends with good correlation to each other since 1660s. They show positive correlations with sugar compounds (e.g., mannitol, fructose, glucose, inositol and sucrose), and anti-correlations with α-dicarbonyls (glyoxal and methylglyoxal) and fatty acids (e.g.,...
|
We recorded the burial times of temperature sensors mounted on a specially constructedtower to determine snow accumulation during individual storms in the summit caldera of MountWrangell, Alaska, USA, (628 N, 1448W; 4100ma.s.l.) during the accumulation year June 2005 to June2006. The experiment showed most of the accumulation occurred in episodic large storms, and half ofthe total accumulation was delivered in late summer. The timing of individual events correlated wellwith storms recorded upwind, at Cordova, the closest Pacific coastal weather station (200kmsouthsoutheast), although the magnitude of events showed only poor correlation. Hence, snow accumulation at Mount Wrangell appears to be a reflection of synoptic-scale...
|
Abstract Monoterpene and isoprene secondary organic aerosol (SOA) tracers are reported for the first time in an Alaskan ice core to better understand the biological source strength before and after the industrial revolution in the Northern Hemisphere. We found significantly high concentrations of monoterpene- and isoprene-SOA tracers (e.g., pinic, pinonic, and 2-methylglyceric acids, 2-methylthreitol and 2-methylerythritol) in the ice core, which show historical trends with good correlation to each other since 1660s. They show positive correlations with sugar compounds (e.g., mannitol, fructose, glucose, inositol and sucrose), and anti-correlations with α-dicarbonyls (glyoxal and methylglyoxal) and fatty acids (e.g.,...
|
|
