The first of 4 campaigns to investigate ‘renoxification’ on aerosols in the remote marine atmosphere as part of the ARNA (Atmospheric reactive nitrogen cycling over the ocean) project is underway.  An LOPAP (LOng Path AbsorPtion) instrument to measure nitrous acid (HONO) has been installed at the CVAO by colleagues at the University of Birmingham to run alongside the core kit.

The UK Facility for Airborne Atmospheric Measurements (FAAM) aircraft also paid the site a visit to contribute to the suite of measurements at this time and as part of the ACSIS project. Subsequent campaigns are scheduled for November 2019, February 2020 and May 2020.

Picture1 Picture2

A new GC-MS has been installed at the CVAO to measure short-lived halocarbons, dimethyl sulfide and isoprene. 

This new instrument uses StayClean technology (https://www.leco.com/support/index.php?option=com_content&view=article&id=486) in its source which we hope will cope better with the challenges of atmospheric sampling in high humidity, dusty marine environments.

 

Balloon over CVAO

Researchers from TROPOS have this week launched a large balloon above the site.  It will be used for some meteorological profiling up to 1000m and for some ice nucleation in cloud experiments. 

Dr Bill Bloss and Dr Leigh Crilley from the University of Birmingham have recently set up an instrument to measure HONO at the CVAO. The aim of the "HAMBL" project is to perform trail / proof of concept measurements to investigate the abundance of HONO in the tropical atlantic boundary layer, its contribution to the overall NOy budget, and in particular to assess evidence for additional sources of HONO, via heterogeneous reactions, in the marine atmosphere. Cape Verde provides an ideal test-bed for this experiment as an established "open ocean" side with complementary measurements already deployed on a long-term basis. The experiment will last three weeks.

20151001 163207

Martin Gallagher and Michael Flynn from the University of Manchester have recently deployed a bioaerosol spectrometer at the CVAO. They would like to try and produce a seasonal picture of the bio-fluorescent particle concentration at the site as a function of air mass, biomass burning indices and local sea-spray generated sources.