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Assessing the oxidation capacity in polar spring

Assessing the oxidation capacity in polar spring. Jingqiu Mao, Daniel Jacob, Jenny Fisher, Bob Yantosca, Philippe Le Sager, Claire Carouge Harvard University

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Assessing the oxidation capacity in polar spring

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  1. Assessing the oxidation capacity in polar spring 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 1st ~ April 20th NO,O3: Andy Weinheimer(NCAR) NO2, PAN: Ron Cohen(UC Berkeley) OH & HO2: Bill Brune(Penn State) H2O2 & MHP: Paul Wennberg(Caltech) HCHO: Alan Fried(NCAR) Box modeling: Jennifer Olson (Langley) BrO: Greg Huey(Georgia Tech) ARCTAS

  3. Observation Vs. GEOSCHEM (median) 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

  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. OH HO2 (Courtesy of J. Olson) (Huey) Gamma(HO2)

  5. HOx reservoirs-H2O2 Black: Observation Green: Geoschem without HO2 uptake Red: Geoschem with HO2 uptake and the reaction 0.5HO2->H2O2 Blue: Geoschem with HO2 uptake and the reaction 0.5HO2->products. HO2 HO2(g)0.5H2O2??? ??? H2O2 • HO2+HSO4-SO5- + H2O (Cooper and Abbatt,1996) • HO2+H2SO4HO2-H2SO4 complex (Miller, 2001)

  6. HOx reservoirs-2.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! HCHO HCHO distribution In BL

  7. HOx sources distribution in polar spring • H2O2 becomes the major HOx 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. • O1D+H2O and HCHO both dominates the HOx sources in the lower troposphere.

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