1. REMOTE SENSING OF TROPOSPHERIC COMPOSITION Daniel J. Jacob

2. WHY OBSERVE TROPOSPHERIC COMPOSITION FROM SPACE? Monitoring and forecasting of air quality: ozone, aerosols Long-range transport of pollution Monitoring of sources: pollution and greenhouse gases solar backscatter thermal emission solar occultation lidar FOUR OBSERVATION METHODS: Global/continuous measurement capability important for range of issues: Radiative climate forcing

3. TROPOSPHERIC COMPOSITION FROM SPACE: platforms, instruments, species SensorTOMSGOMEMOPITTMISRMODISAIRSSCIA- MACHY TESMLSOMIOCO Platform (launch) multi (1979-) ERS-2 (1995) Terra Aqua (1999) ( 2002) Envisat (2002) Aura (2004)2008 ozoneX (tro- pics) XXXX COXXXXX CO 2 XXX CH 4 X NO 2 XXX HNO 3 X HCHOXX BrOXXX aerosolXX

4. K. Folkert Boersma (Harvard) TROPOSPHERIC NO 2 FROM OMI: MAPPING OF NITROGEN OXIDE EMISSIONS October 2004

5. K. Folkert Boersma (Harvard) TROPOSPHERIC NO 2 FROM OMI: ZOOM ON U.S. AND MEXICO MILAGRO campaign, March 2006

6. FORMALDEHYDE FROM OMI: MAPPING OF REACTIVE HYDROCARBON SOURCES Shows vegetation to be dominant; anthropogenic source hardly detectable Thomas Kurosu (Harvard/SAO) and Dylan B. Millet (Harvard)

7. Continuous mapping of tropospheric columns of O 3, aerosols, CO, CH 2 O, NO 2, SO 2 Continental-scale for GEO, full sunlit disk for L1 km-scale resolution LOOKING TOWARD THE FUTURE: GEOSTATIONARY AND L1 MISSIONS GEO L1