References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-10-3759-2010

Hydroxyl radicals in the tropical troposphere over the Suriname rainforest: airborne measurements

Martinez

¹ Harder

¹ Kubistin

¹ Rudolf

¹ Bozem

¹ Eerdekens

¹ ³ Fischer

¹ Klüpfel

¹ Gurk

¹ Königstedt

¹ Parchatka

¹ Schiller

C. L.

² Stickler

¹ ⁴ Williams

¹ Lelieveld

Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany

Department of Chemistry, York University, Toronto, Canada

now at: Department of Biology, University of Antwerp, Belgium

now at: Institute for Atmospheric and Climate Science, ETH Zürich, Switzerland

22 04 2010

10 8 3759 3773

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/10/3759/2010/acp-10-3759-2010.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/3759/2010/acp-10-3759-2010.pdf

Direct measurements of OH and HO2 over a tropical rainforest were made for the first time during the GABRIEL campaign in October 2005, deploying the custom-built HORUS instrument (HydrOxyl Radical measurement Unit based on fluorescence Spectroscopy), adapted to fly in a Learjet wingpod. Biogenic hydrocarbon emissions were expected to strongly reduce the OH and HO2 mixing ratios as the air is transported from the ocean over the forest. However, surprisingly high mixing ratios of both OH and HO2 were encountered in the boundary layer over the rainforest. The HORUS instrumentation and calibration methods are described in detail and the measurement results obtained are discussed. The extensive dataset collected during GABRIEL, including measurements of many other trace gases and photolysis frequencies, has been used to quantify the main sources and sinks of OH. Comparison of these measurement-derived formation and loss rates of OH indicates strong previously overlooked recycling of OH in the boundary layer over the tropical rainforest, occurring in chorus with isoprene emission.

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