Is there a Summertime Middle East Ozone Maximum in the Upper Troposphere? Matthew Cooper, Randall Martin, Bastien Sauvage, OSIRIS Team, ACE Team GEOS-Chem.

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Presentation transcript:

Is there a Summertime Middle East Ozone Maximum in the Upper Troposphere? Matthew Cooper, Randall Martin, Bastien Sauvage, OSIRIS Team, ACE Team GEOS-Chem User’s Meeting 8 April 2009

GEOS-Chem predicts high ozone over Middle East (Li et al [GRL 2001]) Observed by TES in middle troposphere (Liu et al [JGR 2008]) Not apparent in GOME (Liu et al [GRL 2006]) ozone mixing ratio (ppbv) Conflicting Information Regarding Ozone Over Middle East GEOS-Chem Ozone JJA, km

OSIRIS (JJA , km) – No Middle East Max MOZAIC & Sondes (JJA , km) O3 mixing ratio (ppbv) OSIRIS: Limb scattering instrument on Odin satellite Correlation with MOZAIC 0.5 Mean bias 15%

ACE (JJA , km) – No Middle East Maximum ACE Solar occultation instrument on SCISAT-1 Correlation 0.7 Mean bias 10% Most profiles do not reach km MOZAIC & Sondes (JJA , km) O3 mixing ratio (ppbv)

Local Lightning Rescaling Original Version, JJA Local Lightning Rescaling, JJA NO x emissions (10 9 molec N/cm 2 /s) Scale lightning emissions to observed flash rates Reduces emissions in Asia [Sauvage et al, ACP 2007]

Region influenced by Asian pollution, monsoon Local Lightning Rescaling reduces NOx emissions over Asia, reduces ozone over Middle East Rescaling Lightning Reduces Middle East Ozone Max ΔO3 (ppbv) Without – With Local Lightning Rescaling, JJA 10-12km

GEOS-Chem GEOS-Chem Rescaled Lightning MOZAIC & SHADOZ Rescaling Lightning Improves Agreement With Observations [Sauvage et al, ACP 2007] Dubai JJA Pressure (hPa) Height (km) Ozone (ppbv)

Concluding Remarks Elevated ozone in original GEOS- Chem between km is not observed by MOZAIC, OSIRIS or ACE Local Lightning Rescaling reduces ozone over Middle East