IASI Carbon Monoxide Global and Regional Trends over the period [2008 - 2022]

<p>Carbon monoxide (CO) is a key atmospheric pollutant that is closely monitored for its role in<br />tropospheric chemistry as a modulator of the oxidizing capacity of the atmosphere. It is mainly<br />emitted into the atmosphere during combustion processes linked to anthropogenic activities<br />(heating, industry, transport) and during biomass combustion (natural fires or burning of agricultural<br />waste).</p> <p>Since 2007, three IASI (Infrared Atmospheric Sounding interferometer) instruments have been<br />successively embarked on board of the polar-orbiting meteorological satellites Metop-A, -B and -C.<br />They provide a global and daily coverage of CO concentrations in the atmosphere, with two daily<br />overpasses (at 9:30 am and 9:30 pm local time). In February 2022, EUMETSAT reprocessed the whole<br />IASI CO dataset , providing a homogeneous record of CO, since the beginning of the mission.</p> <p>In this study, and for the first time, we use this 15-years of continuous and homogenized dataset to<br />analyze the evolution of daytime CO concentrations from January 2008 to December 2022. The<br />Theil-Sen method is applied on the deseasonalized dataset in order to compute the slope of the<br />trend. The p-value of Sen&#8217;s Slope is determined by using the Mann-Kendall test.</p> <p>Here, we analyze the evolution of CO concentrations on a global and regional scale, and show the<br />evolution of CO concentrations in each hemisphere and in specific regions of the world that are<br />sensitive to biomass fires (Central Africa, South America) and anthropogenic emissions (South and<br />East Asia, Europe and North America). The results are compared with the documented trends in<br />emission inventories.</p>