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Jingqiu Mao, Daniel Jacob, Jenny Fisher, Bob Yantosca, Philippe Le Sager, Claire Carouge Harvard University Bill Brune(Penn State),Ron Cohen(UC Berkeley),

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Presentation on theme: "Jingqiu Mao, Daniel Jacob, Jenny Fisher, Bob Yantosca, Philippe Le Sager, Claire Carouge Harvard University Bill Brune(Penn State),Ron Cohen(UC Berkeley),"— Presentation transcript:

1 Jingqiu Mao, Daniel Jacob, Jenny Fisher, Bob Yantosca, Philippe Le Sager, Claire Carouge Harvard University Bill Brune(Penn State),Ron Cohen(UC Berkeley), Alan Fried(NCAR), Paul Wennberg(Caltech), Jennifer Olson(NASA Langley), Andy Weinheimer(NCAR), Greg Huey (Gatech)

2 Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) Phase I: April 1 st ~ April 20 th ARCTAS NO,O 3 : Andy Weinheimer(NCAR) NO2, PAN: Ron Cohen(UC Berkeley) OH & HO 2 : Bill Brune(Penn State) H 2 O 2 & MHP: Paul Wennberg(Caltech) HCHO: Alan Fried(NCAR) Box modeling: Jennifer Olson (Langley) BrO: Greg Huey(Georgia Tech)

3 GEOSCHEM (v8-01-01): 1. GEOS-5 reprocessed met field 2.With OMI daily O3 column 3.New Flambe emission (updated in March 2009) 4. 1yr spinup Observation Vs. GEOSCHEM (median)

4 1.BrO +HO2->OH? ~5 ppt only changes OH. HO2 is highly buffered. 2. NOx? 1 molecule BrO = 3 molecule NO, 10ppt NO is not enough. 3. HO2(g)->HO2(aq)??? Uptake coefficient favors cold temperature. Could be even higher than this if any Cu (or Fe) ions in aerosol phase. Gamma(HO2) OH HO 2 (Huey) (Courtesy of J. Olson)

5 Black: Observation Green: Geoschem without HO 2 uptake Red: Geoschem with HO 2 uptake and the reaction 0.5HO 2 ->H 2 O 2 Blue: Geoschem with HO 2 uptake and the reaction 0.5HO 2 ->products. 1.HO 2 +HSO 4 -  SO 5 - + H 2 O (Cooper and Abbatt,1996) 2.HO 2 +H 2 SO 4  HO 2 -H 2 SO 4 complex (Miller, 2001) HO 2 H2O2H2O2 HO 2 (g)  0.5H 2 O 2 ??? ??? HO x reservoirs-H 2 O 2

6 HO x reservoirs-2.HCHO HCHO distribution In BL HCHO HCHO during TOPSE(Wang et al., 2003), similar to ARCTAS. HCHO needs further investigation and the numbers could change a little with the final corrections. The lifetime of HCHO is just a few hours. Need big source!

7 HO x sources distribution in polar spring H 2 O 2 becomes the major HO x sources in UT of the arctic region, which never happens in mid-lat or tropics. This is mainly due to the low water vapor and high SZA in the polar region, which limit the oxidation power of other sources. O 1 D+H 2 O and HCHO both dominates the HO x sources in the lower troposphere.

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