1. EOS CHEM

2. EOS-CHEM Platform Orbit: Polar: 705 km, sun-synchronous, 98 o inclination, ascending 1:45 PM +/- 15 min. equator crossing time. Launch date - 4th quarter, 2002, Delta 7920. CHEM will follow PM in the same orbit by 15 minutes. Six Year Life Orbit: Polar: 705 km, sun-synchronous, 98 o inclination, ascending 1:45 PM +/- 15 min. equator crossing time. Launch date - 4th quarter, 2002, Delta 7920. CHEM will follow PM in the same orbit by 15 minutes. Six Year Life MLS OMI HIRDLS TES

3. EOS CHEM HIRDLSHIRDLS High Resolution Dynamics Limb Sounder – Limb emission, IR 6.12-17.76  km  vertical, 10 km cross track, high horizontal resolution scanner (500- 3,000 km wide, 6 positions) – Stratospheric radicals: O 3, NO 2 – Stratospheric Reservoirs: ClONO 2, HNO 3,N 2 O 5 – Tracers: CFC-11, CFC-12, CH 4, H 2 O, N 2 O – Temperature, Geopotential height – Aerosols Extinction Coef. (4 channels) – Upper tropospheric cirrus High Resolution Dynamics Limb Sounder – Limb emission, IR 6.12-17.76  km  vertical, 10 km cross track, high horizontal resolution scanner (500- 3,000 km wide, 6 positions) – Stratospheric radicals: O 3, NO 2 – Stratospheric Reservoirs: ClONO 2, HNO 3,N 2 O 5 – Tracers: CFC-11, CFC-12, CH 4, H 2 O, N 2 O – Temperature, Geopotential height – Aerosols Extinction Coef. (4 channels) – Upper tropospheric cirrus

4. EOS CHEM MLSMLS Microwave Limb Sounder – Limb emission, resolution 1.5-3 km vertical, 3-10 km cross track. – Stratospheric Radicals: O 3, OH, HO 2, ClO, HOCl, BrO. – Stratospheric Reservoirs: HCl, HNO 3. – Tracers: N 2 O, H 2 O, SO 2.CO, HCN – Upper tropospheric O 3, H 2 O, Cirrus ice, HCN, and CO. – Temperature and geopotential height. Microwave Limb Sounder – Limb emission, resolution 1.5-3 km vertical, 3-10 km cross track. – Stratospheric Radicals: O 3, OH, HO 2, ClO, HOCl, BrO. – Stratospheric Reservoirs: HCl, HNO 3. – Tracers: N 2 O, H 2 O, SO 2.CO, HCN – Upper tropospheric O 3, H 2 O, Cirrus ice, HCN, and CO. – Temperature and geopotential height.

5. EOS CHEM TESTES Tropospheric Emission Spectrometer – Nadir and limb Fourier transform emission spectrometer Limb mode, 2.3 km vertical resolution, coverage 0-34 km Nadir mode, 5.3x8.5 km – Tropospheric and stratospheric O 3, H 2 O, CH 4, CO, HNO 3, NO, NO 2 – Aerosols, Temperature – Spectral Coverage 3.2 - 15.4  m Tropospheric Emission Spectrometer – Nadir and limb Fourier transform emission spectrometer Limb mode, 2.3 km vertical resolution, coverage 0-34 km Nadir mode, 5.3x8.5 km – Tropospheric and stratospheric O 3, H 2 O, CH 4, CO, HNO 3, NO, NO 2 – Aerosols, Temperature – Spectral Coverage 3.2 - 15.4  m

6. EOS CHEM OMIOMI Ozone Monitoring Instrument – Nadir solar backscatter spectrometer, 13x24 km footprint – Radicals: Column O 3, NO 2, BrO, OClO, O 3 profile ~ 5 km resolution – Tracers: Column SO 2 – Aerosols (smoke, dust and sulfates) – Cloud top press., cloud coverage – UVB – Tropospheric ozone (when combined with MLS or HIRDLS) Ozone Monitoring Instrument – Nadir solar backscatter spectrometer, 13x24 km footprint – Radicals: Column O 3, NO 2, BrO, OClO, O 3 profile ~ 5 km resolution – Tracers: Column SO 2 – Aerosols (smoke, dust and sulfates) – Cloud top press., cloud coverage – UVB – Tropospheric ozone (when combined with MLS or HIRDLS)

7. CHEM Scan Pattern

8. EOS CHEM Science Questions Is the ozone layer changing as expected? Do we understand the transport of gases within the stratosphere and between the stratosphere and troposphere? What are the sources of tropospheric pollutants? What are the roles of upper tropospheric water vapor, aerosols and ozone in climate change? Science Questions Is the ozone layer changing as expected? Do we understand the transport of gases within the stratosphere and between the stratosphere and troposphere? What are the sources of tropospheric pollutants? What are the roles of upper tropospheric water vapor, aerosols and ozone in climate change?

9. EOS CHEM Science Strategy: Is the ozone layer changing as expected? Major ozone controlling gases will be measured within the same air mass. Key Radicals: O 3, OH, HO 2, ClO, BrO, NO 2 Key Reservoirs: HCl, ClONO 2, HNO 3 Key Source Gases: N 2 O, CH 4, CFC-11, CFC-12, H 2 O Color Code: MLS, HIRDLS, Both OMI will continue the column ozone record of TOMS and provide profiles of O 3 TES provide redundant measurements of O 3, H 2 O, HNO 3, NO 2, CH 4, CO Major ozone controlling gases will be measured within the same air mass. Key Radicals: O 3, OH, HO 2, ClO, BrO, NO 2 Key Reservoirs: HCl, ClONO 2, HNO 3 Key Source Gases: N 2 O, CH 4, CFC-11, CFC-12, H 2 O Color Code: MLS, HIRDLS, Both OMI will continue the column ozone record of TOMS and provide profiles of O 3 TES provide redundant measurements of O 3, H 2 O, HNO 3, NO 2, CH 4, CO

10. EOS CHEM Science Strategy: What are the sources of tropospheric pollutants? Measurement of gases that control tropospheric ozone TES: O 3, NO, NO 2, CO, CH 4, HNO 3 OMI: Column O 3, NO 2, BrO, Aerosols HIRDLS: O 3 transport from stratosphere to the troposphere MLS: UT CO, O 3 and H 2 O Residual Trop. Ozone OMI & MLS, HIRDLS Measurement of gases that control tropospheric ozone TES: O 3, NO, NO 2, CO, CH 4, HNO 3 OMI: Column O 3, NO 2, BrO, Aerosols HIRDLS: O 3 transport from stratosphere to the troposphere MLS: UT CO, O 3 and H 2 O Residual Trop. Ozone OMI & MLS, HIRDLS Global Nitrogen Dioxide Global Ozone Monitoring Experiment (GOME) on ERS-2. Total column NO 2 showing effects of urban areas in N. Hemisphere, biomass burning in Southern Hemisphere. Courtesy J. Burrows, Univ. of Bremen BiomassBurningBiomassBurning Urban Air Pollution Urban

11. EOS CHEM Science Strategy: What is the role of upper tropospheric water vapor, ozone and aerosols in climate change? UT/LS H 2 O, CO and O 3 from TES and MLS Cirrus ice from MLS LS/UT cloud, aerosol, O 3 and H 2 O from HIRDLS Tropospheric aerosols from OMI Temperatures from MLS, HIRDLS & TES Cirrus ice from MLS LS/UT cloud, aerosol, O 3 and H 2 O from HIRDLS Tropospheric aerosols from OMI Temperatures from MLS, HIRDLS & TES

12. EOS CHEM Science Strategy: Do we understand the transport of gases within the stratosphere, and between the stratosphere and troposphere? High resolution measurements of upper troposphere and lower stratospheric variability from HIRDLS – Trace gases: O 3, H 2 O, CFC’s, N 2 O, CH 4 – Temperature, geopotential height High resolution measurements of upper troposphere and lower stratospheric variability from HIRDLS – Trace gases: O 3, H 2 O, CFC’s, N 2 O, CH 4 – Temperature, geopotential height HIRDLS scan pattern overlaid on RDF simulation of N 2 O at 20 km.

13. EOS CHEM EOS CHEM Summary EOS CHEM will make important measurements of the chemistry and dynamics of the stratosphere. – All of the important radical, reservoir and source gases in the stratosphere – Most measurements will be within the same air mass. – High horizontal and vertical resolution data from HIRDLS – Continuation of the column ozone record from TOMS by OMI EOS CHEM will make new chemical measurements of the troposphere. – Ozone & nitrogen oxides from TES, OMI, MLS and HIRDLS EOS CHEM will make important climate measurements. – Upper troposphere ozone, water vapor, clouds and temperature from MLS, TES and HIRDLS – Aerosols and clouds from OMI – Measurements near coincident with EOS-PM EOS CHEM will make important measurements of the chemistry and dynamics of the stratosphere. – All of the important radical, reservoir and source gases in the stratosphere – Most measurements will be within the same air mass. – High horizontal and vertical resolution data from HIRDLS – Continuation of the column ozone record from TOMS by OMI EOS CHEM will make new chemical measurements of the troposphere. – Ozone & nitrogen oxides from TES, OMI, MLS and HIRDLS EOS CHEM will make important climate measurements. – Upper troposphere ozone, water vapor, clouds and temperature from MLS, TES and HIRDLS – Aerosols and clouds from OMI – Measurements near coincident with EOS-PM http://eos-chem.gsfc.nasa.gov/

14. EOS CHEM EOS CHEM Project NASA HQ NASA GSFC Project Managers P. Sabelhaus M. Luce S. Gallagher Project Managers P. Sabelhaus M. Luce S. Gallagher Project Scientists M. Schoeberl A. Douglass E. Hilsenrath Project Scientists M. Schoeberl A. Douglass E. Hilsenrath Program Scientist R. J. McNeal Program Scientist R. J. McNeal MLS JPL J. Waters MLS JPL J. Waters HIRDLS UCB-Oxford J. Gille, J. Barnett HIRDLS UCB-Oxford J. Gille, J. Barnett TES JPL R. Beer TES JPL R. Beer OMI KNMI/NIVR P. Levelt OMI KNMI/NIVR P. Levelt Instrument PI’s

15. EOS CHEM EOS CHEM Working Groups Science A. Douglass Science A. Douglass Mission Operations A. Kelly Mission Operations A. Kelly Data Systems S. Larson Data Systems S. Larson Algorithm P. Bhartia Algorithm P. Bhartia Education & Outreach E. Hilsenrath Education & Outreach E. Hilsenrath Validation L. Froidevaux Validation L. Froidevaux Aerosol S. Massie Aerosol S. Massie