Wednesday, June 1, 2011

NOx and O3 and mangrove

Biosphere-atmosphere exchange of NOx in the tropical mangrove forest
D. Ganguly,1 M. Dey,1 S. Sen,2 and T. K. Jana1
Received 8 September 2008; revised 20 July 2009; accepted 3 September 2009; published 2
December 2009.
Abstract
[1] Biosphere-atmosphere exchange of NOx at the Sundarban mangrove forest along
the northeast coast of the Bay of Bengal, India, showed uptake rates of -0.84 to
-1.63 ng N m-2
s-1 during the day and both uptake and emission rates of -0.36 to
5.19 ng N m-2
s-1
during the night from September to February. However, during the
period from March to August , NOx emission ranged between 0.34 and 2.13 ng N m-2
s-1
and 0.88 and 3.26 ng N m-2
s-1
in dayt ime and night t ime, respect ively. During the
postmonsoon period, NOx uptake could be att ributed to mangrove stomatal act ivity during
the day. Mangroves absorbed nit rogen from both the soil and the atmosphere. Seasonal
and diurnal variability of NOx and O3 is part ly due to plant growth in the postmonsoon
period. In addit ion to the NOx-O3 photochemical cycle, stomatal uptake of NOx could
also be an important process for keeping a low-ozone state at the land-ocean boundary of
the northeast coast of the Bay of Bengal.
Citation: Ganguly, D., M. Dey, S. Sen, and T. K. Jana (2009), Biosphere-atmosphere ex tropical mangrove forest, J. Geophys. Res., 114, G04014, doi:10.1029/2008JG000852

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