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We present an oxidation mechanism of intermediate sizefor isoprene (2-methyl-1,3-butadiene) suitable for simulations in regionaland global atmospheric chemistry models, which we call MIM2. It is a reduction of the correspondingdetailed mechanism in the Master Chemical Mechanism (MCM v3.1) and intendedas the second version of the well-established Mainz Isoprene Mechanism (MIM).Our aim is to improve the representation of troposphericchemistry in regional and global models under all NOx regimes. We evaluateMIM2 and re-evaluate MIM through comparisons with MCM v3.1.We find that MIM and MIM2 compute similar O3, OH and isoprene mixing ratios.Unlike MIM, MIM2 produces small relative biases for NOx andorganic nitrogen-containing species due to a good representation of the alkyl and peroxy acyl nitrates(RONO2 and RC(O)OONO2). Moreover, MIM2 computes only small relativebiases with respect to hydrogen peroxide (H2O2),methyl peroxide (CH3OOH), methanol (CH3OH),formaldehyde (HCHO), peroxy acetyl nitrate (PAN), and formic and acetic acids(HCOOH and CH3C(O)OH), being always below ≈6% inall NOx scenarios studied. Most of the isoprene oxidation products are representedexplicitly, including methyl vinyl ketone (MVK), methacrolein (MACR), hydroxyacetone and methyl glyoxal.MIM2 is mass-conserving with respect to carbon, including CO2 as well.Therefore, it is suitable for studies assessing carbon monoxide (CO) from biogenic sources,as well as for studies focused on the carbon cycle.Compared to MIM, MIM2 considers new species like acetaldehyde (CH3CHO),propene (CH2=CHCH3) and glyoxal (CHOCHO) with global chemical production rates for the year 2005 of 7.3, 9.5 and 33.8 Tg/yr, respectively.Our new mechanism is expected to substantially improve the resultsof atmospheric chemistry models by representing many moreintermediates, that are transported and deposited, which allows us totest model results with many more new measurements.MIM2 allows regional and global models to easily incorporate new experimental resultson the chemistry of organic species

Mainz Isoprene Mechanism 2 (MIM2): an isoprene oxidation mechanism for regional and global atmospheric modelling