ATom: Alternative Modeled Reactivities, Ozone and Methane, ATom-1 Air Parcels, 2016

Overview

Description

This dataset provides five modeled reactivity data streams for ozone (O3) production and loss, methane (CH4) loss, and photolysis rates (J-values) for O3 and nitrogen dioxide (NO2) for 31,429 ATom-1 flight line air parcels based on five alternative ATom-1 Modeling Data Streams (MDS). The ATom-1 MDS is constructed from the 10-second merged ATom-1 observations with interpolation and fill values for a total of 31,429 unique air parcels and contains initialization values for key species plus temperature and water vapor. The five alternative MDSs were created by changing a selected key species or a class of compounds to either an alternative data stream, as for (1) CO and (2) NOx, or by adjusting values for (3) peroxy acetyl nitrate (PAN), (4) organic nitrates, and (5) other alkanes, for measurement uncertainty. The O3 and CH4 reactivities for the five alternative MDSs were modeled by the UCI global 3D atmospheric chemistry model. The modeled alternative reactivities were derived for five different days (24 hrs) in August (08/01, 08/06, 08/11, 08/16, 08/21) to sample different weather and cloud patterns over the month. Average reactivities and J-values of the five daily values and standard deviations are reported for each parcel. The data from each of the five UCI model runs are for 2016. The use of alternative data streams facilitates the evaluation of measurement uncertainties and the importance of key species on calculated reactivities. Results from the alternative data streams can also be used to set detection threshold level (LLOD) for an instrument.

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