Abstract
<p>Within the project VALIASI (VALidation of IASI level 2 products) the validation of the IASI operational atmospheric trace gas products (total column amounts of H<sub>2</sub>O, O<sub>3</sub>, CH<sub>4</sub>, N<sub>2</sub>O, CO<sub>2</sub> and CO as well H<sub>2</sub>O and O<sub>3</sub> profiles) will be carried out. Ground-based FTS (Fourier Transform Spectrometer) trace gas measurements made in the framework of NDACC (Network for the Detection of Atmospheric Composition Change) serve as the validation reference. In this work, we will present the validation methodology developed for this project and show the first intercomparison results obtained for the Izaña Atmospheric Observatory between 2008 and 2012. As example, we will focus on two of the most important greenhouse gases, CH<sub>4</sub> and N<sub>2</sub>O.</p>
Highlights
Reliable Earth observation data sets are needed for understanding the processes driving climate change and for supporting decisions on climate change mitigation strategies
VALIASI will document the quality of the whole IASI-A time series (2007-2012) for three different NDACC FTS sites, covering different geographical and atmospheric conditions: Izaña Atmospheric Observatory (IZO, Spain) at the subtropics, Karlsruhe (Germany) at the mid-latitudes, and Kiruna (Sweden) at the Arctic
As observed in Figure 3.d and 3.e, the IASI CH4 and N2O total column (TC) annual cycle are in good agreement with the annual cycle of the FTS CH4 and N2O Volume Mixing Ratio (VMR) in the tropopause region
Summary
Reliable Earth observation data sets are needed for understanding the processes driving climate change and for supporting decisions on climate change mitigation strategies. Atmospheric remote sounding from space is an essential component of this observational strategy, since it allows for a global coverage In this context, the sensor IASI (Infrared Atmospheric Sounding Interferometer) is a key instrument for EUMETSAT’s contribution to climate monitoring, since it offers a unique combination of high quality (very good signal to noise ratio and a high spectral resolution), excellent horizontal resolution (nadir pixel size of 12 km2), global coverage and longterm data availability. The sensor IASI (Infrared Atmospheric Sounding Interferometer) is a key instrument for EUMETSAT’s contribution to climate monitoring, since it offers a unique combination of high quality (very good signal to noise ratio and a high spectral resolution), excellent horizontal resolution (nadir pixel size of 12 km2), global coverage and longterm data availability It operates from the meteorological polar satellite.
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