Selected Presentation from the INSTAAR Monday Noon Seminar Series. Institute of Arctic and Alpine Research, University of Colorado at Boulder. http://instaar.colorado.edu http://instaar.colorado.edu/other/seminar_mon_presentations This seminar presentation has been posted to the internet to foster communication with the science community and the public. Most of the INSTAAR presentations were originally given in PowerPoint format; they were converted to Adobe PDF for posting. You may need to install the free Adobe Acrobat Reader to view these files. These presentations are "works in progress". They are not peer reviewed. They should not be referenced for any kind of publication. Contact the author for proper references and additional information before any use, even for unpublished works such as your own presentations. LICENSING AGREEMENT. Free use of these presentations is limited to a nonprofit educational or private non-commercial context and requires that you contact the author, give credit to the author, and display the copyright notice. All rights to reproduce these presentations are retained by the copyright owner. Images remain the property of the copyright holder. By accessing these presentations, you are consenting to our licensing agreement. 03 Feb. 2003 Detlev Helmig, INSTAAR and Program in Atmospheric and Oceanic Sciences (PAOS) Email: [email protected]"New insights into snow-photochemical processes and snow-atmosphere gas exchange (if you ever wonder what may happen in your freezer if the light stays on)." Seminar given at INSTAAR, University of Colorado. Copyright 2003 Detlev Helmig. All Rights Reserved. Helmig presentation (2.2 Mb PDF).
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Selected Presentation from the INSTAAR Monday Noon Seminar ...instaar.colorado.edu/other/seminar_mon_presentations/helmig_2003.… · Helmig presentation (2.2 Mb PDF). Abstract Snowpack
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Selected Presentation from the INSTAAR Monday Noon Seminar Series.
Institute of Arctic and Alpine Research, University of Colorado at Boulder.http://instaar.colorado.edu
This seminar presentation has been posted to the internet to foster communication with the science community and thepublic.
Most of the INSTAAR presentations were originally given in PowerPoint format; they were converted to Adobe PDF forposting. You may need to install the free Adobe Acrobat Reader to view these files.
These presentations are "works in progress". They are not peer reviewed. They should not be referenced for any kind ofpublication. Contact the author for proper references and additional information before any use, even for unpublishedworks such as your own presentations.
LICENSING AGREEMENT.Free use of these presentations is limited to a nonprofit educational or private non-commercial context and requires thatyou contact the author, give credit to the author, and display the copyright notice. All rights to reproduce thesepresentations are retained by the copyright owner. Images remain the property of the copyright holder. By accessingthese presentations, you are consenting to our licensing agreement.
03 Feb. 2003 Detlev Helmig, INSTAAR and Program in Atmospheric and Oceanic Sciences (PAOS)Email: [email protected]"New insights into snow-photochemical processes and snow-atmosphere gas exchange (if you ever wonder whatmay happen in your freezer if the light stays on)."Seminar given at INSTAAR, University of Colorado. Copyright 2003 Detlev Helmig. All Rights Reserved.Helmig presentation (2.2 Mb PDF).
Selected Presentation from the INSTAAR Monday Noon Seminar Series.
Institute of Arctic and Alpine Research, University of Colorado at Boulder.http://instaar.colorado.edu
03 Feb. 2003 Detlev Helmig, INSTAAR and Program in Atmospheric and Oceanic Sciences (PAOS) Email:[email protected]"New insights into snow-photochemical processes and snow-atmosphere gas exchange (if you ever wonder whatmay happen in your freezer if the light stays on)."Seminar given at INSTAAR, University of Colorado. Copyright 2003 Detlev Helmig. All Rights Reserved.Helmig presentation (2.2 Mb PDF).
Abstract
Snowpack has been considered a rather inert substrate that undergoes little chemical interaction with the atmosphere. The conservation of gases in interstitial air and ice cores has been used to decipher records of past atmosphericcomposition and climate. Over the past decade an increasing number of previously unknown snow-photochemicalreactions have been discovered. These processes have been shown to affect the surface-atmosphere exchange of manytrace gases and may have implications on the interpretation of ice core records.
Inert ???
No next day hangover
Deficient in active properties; especially lacking a usual or
anticipated chemical or biological action
Having no or little activity to react
Having no effect
Detlev Helmig
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"New Insights into Snow-Photochemical Processes and Snow-Atmosphere Gas Exchange“
(if you ever wondered what may happen in your freezer in case the light stays on)
Carina in the freezer
Ice Core Measurements
CO2
Methane
Nitrous Oxide (N2O)
CO
Hydrogen Peroxide (H2O2)
Formaldehyde (H2CO)
Methyl Bromide (CH3Br)
Chlorofluorocarbons (CFC)
Methanesulfonate (MSA)
Oxygen
Nitrogen
Argon
Anions: Cl-, NO3-, SO4
2-,
Cations: Ca2+, K+, Mg2+, Na+, NH4+
Others: Fe, S, Al, Si, Ti, Mg
18O in H2O14C in CO14C in CO215N in N236Cl10Be
Primary Aerosol
Electrical Conductivity (balance of acids and bases)