ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-3409-2009 Process-based modelling of biogenic monoterpene emissions combining production and release from storage Schurgers G. 1 Arneth A. 1 2 Holzinger R. 3 Goldstein A. H. 4 Lund University, Department of Physical Geography and Ecosystems Analysis, Sölvegatan 12, 223 62 Lund, Sweden University of Helsinki, Department of Physical Sciences, Helsinki, Finland Utrecht University, Institute for Marine and Atmospheric Research, Utrecht, The Netherlands University of California at Berkeley, Department of Environmental Science, Policy and Management, Berkeley, CA, USA 27 05 2009 9 10 3409 3423 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/9/3409/2009/acp-9-3409-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/3409/2009/acp-9-3409-2009.pdf

Monoterpenes, primarily emitted by terrestrial vegetation, can influence atmospheric ozone chemistry, and can form precursors for secondary organic aerosol. The short-term emissions of monoterpenes have been well studied and understood, but their long-term variability, which is particularly important for atmospheric chemistry, has not. This understanding is crucial for the understanding of future changes. <br><br> In this study, two algorithms of terrestrial biogenic monoterpene emissions, the first one based on the short-term volatilization of monoterpenes, as commonly used for temperature-dependent emissions, and the second one based on long-term production of monoterpenes (linked to photosynthesis) combined with emissions from storage, were compared and evaluated with measurements from a Ponderosa pine plantation (Blodgett Forest, California). The measurements were used to parameterize the long-term storage of monoterpenes, which takes place in specific storage organs and which determines the temporal distribution of the emissions over the year. The difference in assumptions between the first (emission-based) method and the second (production-based) method, which causes a difference in upscaling from instantaneous to daily emissions, requires roughly a doubling of emission capacities to bridge the gap to production capacities. The sensitivities to changes in temperature and light were tested for the new methods, the temperature sensitivity was slightly higher than that of the short-term temperature dependent algorithm. <br><br> Applied on a global scale, the first algorithm resulted in annual total emissions of 29.6 Tg C a<sup>&minus;1</sup>, the second algorithm resulted in 31.8 Tg C a<sup>&minus;1</sup> when applying the correction factor 2 between emission capacities and production capacities. However, the exact magnitude of such a correction is spatially varying and hard to determine as a global average.

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