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During the Mt Kelud February 2014 eruption the ash cloud was detectableon 13–14 February in the infrared with the reverse absorption techniqueby, for example, the Advanced Very High Resolution Radiometer(AVHRR/3). The Infrared Atmospheric Sounding Interferometer (IASI)observed the ash cloud also on 15 February when AVHRR did not detect anyash signal. The differences between ash detection with AVHRR/3 and IASIare discussed along with the reasons for the differences, supported by radiative transfer modelling. The effect of concurrent ice clouds onthe ash detection and the ash signal in the IASI measurements isdemonstrated. Specifically, a radiative transfermodel is used to simulate IASI spectra with ash-only, with ice cloudonly and with both ash and ice clouds. It is shown that modelled IASIspectra with ash and ice clouds reproduce themeasured IASI spectra better than ash-only- or ice-only-modelled spectra. Theash and ice modelled spectra that best reproduce the IASI spectracontain about a factor of 12 less ash than the ash-only spectra thatcome closest to reproducing the measured spectra

Ash and ice clouds during the Mt Kelud February 2014 eruption as interpreted from IASI and AVHRR/3 observations