Welcome to the Harvard Atmospheric
Chemistry Modeling Group!
goal is to understand the chemical composition of the atmosphere, its
perturbation by human activity, and the implications for climate change
and life on Earth. We
address this goal through global modeling of atmospheric chemistry and
climate, aircraft measurement campaigns, satellite data retrievals, and
analyses of atmospheric observations.
Jacob, Jennifer A. Logan, Loretta
J. Mickley, Elsie
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by Eloïse Ann Marais
et al., Atmos.
Chem. Phys. 5,
average OMI-derived (left) and MEGAN isoprene emissions
(middle) and the difference between the two estimates (right).
We show that satellite-based observatons of formaldehyde (HCHO), a
high-yield product of isoprene, can be used to estimate isoprene
emissions in Africa - a region with limited ground-based observations.
In our approach we (1) filter for biomass burning and
anthropogenic HCHO sources; (2) remove dusty scenes in north Africa
that impact the air mass factor estimate to convert slant columns to
vertical columns; (3) account for smearing of the HCHO signal in
central Africa where OH levels are low and isoprene emissions are high;
and (4) use GEOS-Chem to obtain a NOx-dependent HCHO yield to
estimate isoprene emissions. On comparing our top-down isoprene
emissions we find that total emissions from the
state-of-the-science emission inventory MEGAN are similar to our
estimate, but with large spatial discrepancies (see figure
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Brenda Mathieu (email@example.com)
Pierce Hall, 29
Cambridge MA 02138-2901, USA
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