Boreal Forest OH Reactivity Measurements

The OH reactivity will be measured using a newly developed technique
called the Comparative Reactivity Method .In this method, pyrrole, not normally
present in air, is passed through a glass reactor  and its concentration is monitored with a PTR-MS.
OH radicals are then introduced in the glass reactor at a constant rate to
react with X, first in the presence of zero air and then in the presence of
ambient air containing VOCs and other OH reactive species. Comparing the amount
of X exiting the reactor with and without the ambient air allows the air OH
reactivity to be determined.

Measurement of the ambient air VOCs and other OH reactive species will
performed using the following instrumentation:1) PTR-MS (from University
of Helsinki) 2) Chemiluminescence detector for NOx (from Universityof
 Helsinki) 

More detailed project description

Dr Vinayak Sinha
Max Planck Institute for Chemistry
J J Becher Weg 27, POBox 3060, 55128 Mainz, Germany
+49-6131-305417
+49-6131-305436
vsinha<at>mpch-mainz.mpg.de 

Dr Taina RuuskanenDivision of the Atmospheric Sciences, UH

Dr. Sinha explaining the instrumentation to Finnish colleagues

The sample inlets for the campaign in the 8 m height in the mast of the SMEAR II

 An owerview of Dr. Sinha's instrumentation

The OH Reactivity Glass Reactor