Dissolved gases as tracers of water-mass formation and transformation

Improved analytical methods are allowing the use of inert gases as tracers of
surface processes occurring during water mass formation. The noble gases (I
measure neon, argon, krypton, and xenon) and nitrogen have a wide range of
physical properties (solubilities and temperature dependency of their
solubilities). These different physical properties cause the gases to react
quite differently to the rapid cooling and high wind speeds associated with
deep-water formation in the North Atlantic and Southern Ocean. This talk uses
simple models to demonstrate the properties of these gases, how they can be used
to constrain processes that cause gas disequilibria, and the applications to
understanding oxygen and carbon dioxide distributions in the ocean including the
carbon solubility pump. I will also touch very briefly on several other
applications for high quality dissolved gas measurements: determining diapycnal
mixing rates in the thermocline, denitrification rates from N2/Ar, and
biological productivity rates from O2/Ar.

Datum

10.03.2010

Uhrzeit

13:30 Uhr

Ort

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

ReferentIn

Roberta Hamme, chool of Earth and Ocean Sciences, University of Victoria, Canada

Chair


Zur Übersicht