This dataset contains wind, temperature, pressure, humidity and ozone mixing ratio, given as the 20-minute mean of 10 Hz (ozone and wind) or 0.25 Hz (pressure, humidity and temperature) raw data. Ozone flux values calculated from the raw 10 Hz wind and ozone data are presented as mass fluxes and as molar fluxes. Deposition velocity is calculated from the molar flux. Data relevant to the data selection are also included, such as ozone variability, instrument sensitivity, wind stationarity and wind speed and direction. The Penlee Point Atmospheric Observatory (PPAO) site is best suited to observing fluxes over water. The north-west sector contains the sloping headland on which the observatory is built, making flux observations in this sector of limited value. The footprint area (where the measured flux is occurring) varies with wind conditions, but generally 90% of flux contribution occurs within 2-3 km of the observatory. The building itself sits 30-60m from the coast, depending on tide. Measurements were taken from 2018/04/10 - 2018/05/21 using a Gill WindMaster Pro sonic anemometer, a Gill MetPak Pro, and a high frequency chemiluminescence ozone detector from Eco Physics. A 2B 205 ozone monitor was used as a reference for the high frequency ozone instrument. Data collection was managed by David Loades (University of York), Thomas Bell (Plymouth Marine Laboratory) and Mingxi Yang (Plymouth Marine Laboratory). Data are missing where fluxes couldn't be calculated, most commonly due to heavy rain disrupting the anemometer or power outages. These data were collected for the Natural Environment Research Council (NERC) project Iodide in the ocean:distribution and impact on iodine flux and ozone loss.

The Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) project provides information on the connection between the composition and the distribution of biomass burning outflow, ozone production and loss within the outflow, and the resulting perturbation to oxidant chemistry in the troposphere. The BORTAS team sampled biomass burning outflow over the North Atlantic in summer 2011 the using Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 aircraft. The data were then used to describe the observed chemistry within plumes and to quantify the impact of boreal fires on the North Atlantic region using a nested 3-D chemistry transport model. This dataset contains atmospheric aircraft and model data. Science Objectives of BORTAS: -Sample biomass burning outflow from boreal North America over the western boundary of the North Atlantic during summer 2011 using the FAAM BAe146 aircraft; -Describe observed chemistry within plumes by using the measurements to constrain the Master Chemical Mechanism (MCM), with particular attention to the NOy and organic chemistry; -Derive a reduced chemical mechanism suitable for a global Chemical Transport Model (CTM) that accurately describes chemistry within the plumes; -Quantify the impact of boreal forest fires on oxidant chemistry over the temperate and subtropical Atlantic using a nested 3-D chemistry transport model, driven by a subset of MCM chemistry and by assimilated field measurements; and -Detect, validate and quantify the impact of boreal biomass burning on global tropospheric composition using data from space-borne sensors. The FAAM airborne sampling element of the BORTAS project took place in July and August 2011.