The ACES (Aerosol Coupling in the Earth System) project was an integrated research programme that aims to reduce uncertainties in our fundamental understanding of the formation of BSOA (Biogenic Secondary Organic Aerosol) and the subsequent impact on atmospheric composition, through coordinated chamber studies, field studies, process model development, and application of atmospheric models of chemistry and transport to assess coupling and feedbacks in the Earth system. This dataset contains measurements of concentration of different sized particles, measured from ground level up to 32 metres. Data were collected for the period 13 April to 23 July 2008 by the University of Manchester GRIMM optical particle counter based at the forest in-canopy site located at the FACE (Forests Absorbing CO2 Emissions) nursery at the Sabahmas Estate oil plantation in Malaysia. Measurements were made at fixed heights of ground level, 8 metres, 16 metres, and 32 metres. Measurements were also taken whilst the instrument was mounted on a winch which had a height range of 1 metre to 28 metres.

Oxidant and Particle Photochemical Processes above a South-East Asian tropical rain forest (OP3-Danum-08) is a 3-year Consortium Grant of the Natural Environment Research Council (NERC), beginning 1 October 2007. The objectives of the OP3 project are (i) to understand how emissions of reactive trace gases from a tropical rain forest mediate the production and processing of oxidants and particles in the troposphere, and (ii) to better understand the impact of these processes on local, regional and global scale atmospheric composition, chemistry and climate.

This dataset contains HCHO measurements. Oxidant and Particle Photochemical Processes above a South-East Asian tropical rain forest (OP3-Danum-08) is a 3-year Consortium Grant of the Natural Environment Research Council (NERC), beginning 1 October 2007. The objectives of the OP3 project are (i) to understand how emissions of reactive trace gases from a tropical rain forest mediate the production and processing of oxidants and particles in the troposphere, and (ii) to better understand the impact of these processes on local, regional and global scale atmospheric composition, chemistry and climate.

An international long-term collaboration to study the climatic and environmental feedback mechanisms involved in the African monsoon, and in some of its consequences on society and human health. The programme, which started in 2004, has developed a network of ground-based observation stations over Sub-Saharan West Africa to measure heat flux and, for some stations, CO2 and H2O vapour fluxes. Files also include concomitant meteorological measurements (wind, temperature, pressure, humidity, rainfall) and soil physics parameters (soil temperature and moisture). The UK branch of AMMA makes use of several instruments provided by the UK Universities Facility for Atmospheric Measurement (UFAM) which are centred on the Niamey meso-site. The Facility for Airbourne Atmospheric Measurements (FAAM) aircraft was used during the July-August 2006 campaign.

Southern Ocean Atmospheric Photochemistry Experiment 2 (SOAPEX-2) is primarily an experiment to study atmospheric cleansing by free radicals in extremely clean and slightly perturbed tropospheric air and focuses on a field campaign carried out at Cape Grim Baseline Air Pollution Station (BAPS), Tasmania in January-February 1999. The dataset contains concentrations of atmospheric constituents such as halocarbons, hydrocarbons, methane, nitric oxide, and carbon monoxide. This dataset is public.

The primary objective of the European eXport of Precursors and Ozone by long-Range Transport (EXPORT) project is to characterise and quantify the photochemical air pollution both forming over Europe and being exported eastwards from Europe. The data held at BADC was collected during a co-ordinated 3 aircraft flying campaign in August 2000 based at Oberpfaffenhofen in Southern Germany. Measurements were made of many photochemical parameters including ozone, its precursors, other oxidants and both gas phase and particulate tracers in the air over Europe and that being transported eastwards out of Europe. This dataset contains airborne atmospheric and chemistry measurements taken on board the Met Office C-130 Hercules aircraft flight A773 for the EXPORT project. The flight was over southern and eastern Germany. Transport of Pollution through a Warm Conveyor Belt From Oberpfaffenhofen the route was first to the far SW of Germany. However, in order to avoid the worst of the cloud (for the NOxy calibration) some retracing of our steps was required. Once at the south western waypoint, the plan was then to cross the front in a square wave pattern, travelling in a north eastern direction and increasing in altitude between runs. This was carried out successfully. We remained within the belt of cloud for much of the flight. The flight appears to have been rather successful. Certainly transport of CO, HCHO, NOx and NOy (including PAN), out of the boundary layer, was very clear. The highest CO mixing ratios (ca. 150 ppb) were found at around 10:40 during a run at FL100. PAN at this time was estimated to be nearly 1 ppb. The following runs at FL120 and FL140 also showed elevated CO etc but CO maxima decreased with altitude. Whether all of the transport was due to the conveyor or if some of it was due to convection remains to be seen. The mixing ratio of ozone throughout the cloudy region was fairly constant (around 50 - 60 ppb); indicating that there had been limited photochemical processing. Once clear of the northern edge of the cloud, the aircrew carried out a 50ft approach to an airfield in Leipzig. This allowed sampling of the boundary layer in the region and was quite a contrast to the rest of the flight. High SO2 readings (ca. 2 ppb) and high NOx readings (TECO NOx ca. 18 ppb) were observed but it should be noted that these were not concurrent: the maximum in NOx following that in SO2 by ca. 5 mins. During this time period the CN was off scale (the CO peaked at around 200 ppb and ozone was reduced to around 30ppb). The high concentrations of primary pollutants were unsurprising given the observation of large industrial chimneys etc in the area. There were a fair number of instrument problems. The lower jNO2 and jO1D radiometers were found to go to full-scale for short periods. The HORACE TAS and TAT were clearly erroneous for a period of around half-an-hour starting at around 9:45 GMT. The flow in the PSAP instrument could not be maintained and missing 'O' rings needed replacing at the beginning of the flight. The FWVS was also found to drop down to -70.5°C fairly regularly. Early problems with the CO instrument (blown fuse) were soon rectified. All other chemistry equipment appeared to work well, despite the very wet conditions. The Met Office midday analysis showed the surface cold front stretching from Northern France to the triple point at the Baltic Sea. The path across Germany was fairly closely matched by the flight plan.

This dataset contains volatile organic compound (VOC) mixing ratios recorded during two intensive field campaigns in Beijing (winter: 12/11/2016 - 10/12/2016; and summer: 15/05/2017 - 24/06/2017) as part of the Atmospheric Pollution & Human Health in a Chinese Megacity (APHH) programme. The species recorded include methanol, acetonitrile, acetaldehyde, acrolein, acetone, isoprene, methyl vinyl ketone and methacrolein, methyl ethyl ketone, benzene, toluene, C2-benzenes, C3-benzenes and monoterpenes. The data were recorded using a proton transfer reaction-time of flight-mass spectrometer (PTR-ToF-MS) from a sampling height of 100m.

Data from the flight 8 of 17 from the NASA/NOAA aircraft campaign based in Darwin, Australia in January and February 1987. Designed to investigate mechanisms of equatorial stratosphere-troposphere exchange. Measurements include trace gases and aerosol in cloud free and cloud dominated conditions. This dataset is public.

Data from observations made at the The Cape Verde Atmospheric Observatory (16.848N, 24.871W) which exists to advance understanding of climatically significant interactions between the atmosphere and ocean and to provide a regional focal point and long-term data. The observatory is based on Calhau Island of São Vicente, Cape Verde in the tropical Eastern North Atlantic Ocean, a region which is data poor but plays a key role in atmosphere-ocean interactions of climate-related and biogeochemical parameters including greenhouse gases. It is an open-ocean site that is representative of a region likely to be sensitive to future climate change, and is minimally influenced by local effects and intermittent continental pollution. The dataset contains mixing ratio measurements of OH and HO2 from University of Leeds.

Observation, Modelling And Management Of Urban Air Pollution (PUMA COnsortium - PUMACO) was a Natural Environment Research Council (NERC) Urban Regeneration and the Environment (URGENT) Air project (GST/02/1981 - Duration: 1/01/1998 - 30/09/2001) led by Prof. Roy M. Harrison, University of Birmingham. This dataset contains measurements from the Automatic Urban Network of nitrogen dioxide, sulphur dioxide, carbon monoxide, nitrogen oxide, ozone and PM 2.5.