Lyatt Jaeglé’s / research
Atmospheric Chemistry Modeling GROUP

Quantifying surface emissions of trace gases and particulates

Surface emissions of many tracer gases and particulates remain highly uncertain. We have been interested in using satellite observations from the Global Ozone Monitoring Experiment (GOME) to provide improved constraints on emissions of nitrogen oxides (Jaeglé et al., 2004 and Jaeglé et al. 2005). More recently, we have combined in situ measurements of sea salt aerosols from open ocean cruises and ground-based stations together with aerosol optical depth (AOD) observations from MODIS and AERONET, and the GEOS-Chem global chemical transport model to provide new constraints on

SSA emissions over the world’s oceans (Jaeglé et al., 2010).

This figure compares space-based observations of coarse mode aerosol optical depth from MODIS (top panel) to two different GEOS-Chem simulations: a standard simulation using the Gong (2003) sea-salt source function (middle panel) and a simulation using a new empirical sea-salt source function depending on both wind speed and sea surface temperature (bottom panel). The new source function greatly improves agreement with the satellite observations as well as cruise and ground-based observations, and  implies a stronger than expected radiative forcing and halogen source from sea-salt in the tropical atmosphere. They also imply a larger response of SSA emissions to climate change than previously believed. For more information, please see Jaeglé et al. (2011).


Lyatt Jaeglé, Professor


We gratefully acknowledge funding from:

> NASA Atmospheric Chemistry Modeling Program 2007-2010 (PI: Lyatt Jaeglé)

>NASA New Investigator Program in Earth Science, 2001-2004 (PI: Lyatt Jaeglé).


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