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000904135 1001_ $$00000-0001-9419-5432$$aWagner, Robert$$b0$$eCorresponding author
000904135 245__ $$aHigh-resolution optical constants of crystalline ammonium nitrate for infrared remote sensing of the Asian Tropopause Aerosol Layer
000904135 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2021
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000904135 520__ $$aInfrared spectroscopic observations have shown that crystalline ammonium nitrate (AN) particles are an abundant constituent of the upper tropospheric aerosol layer which is formed during the Asian summer monsoon period, the so-called Asian Tropopause Aerosol Layer (ATAL). At upper tropospheric temperatures, the thermodynamically stable phase of AN is different from that at 298 K, meaning that presently available room-temperature optical constants of AN, that is, the real and imaginary parts of the complex refractive index, cannot be applied for the quantitative analysis of these infrared measurements. In this work, we have retrieved the first low-temperature data set of optical constants for crystalline AN in the 800–6000 cm−1 wavenumber range with a spectral resolution of 0.5 cm−1. The optical constants were iteratively derived from an infrared extinction spectrum of 1 µm sized AN particles suspended in a cloud chamber at 223 K. The uncertainties of the new data set were carefully assessed in a comprehensive sensitivity analysis. We show that our data accurately fit aircraft-borne infrared measurements of ammonium nitrate particles in the ATAL.
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000904135 7001_ $$0P:(DE-HGF)0$$aTesta, Baptiste$$b1
000904135 7001_ $$00000-0002-4174-9531$$aHöpfner, Michael$$b2
000904135 7001_ $$00000-0003-0136-2428$$aKiselev, Alexei$$b3
000904135 7001_ $$0P:(DE-HGF)0$$aMöhler, Ottmar$$b4
000904135 7001_ $$0P:(DE-HGF)0$$aSaathoff, Harald$$b5
000904135 7001_ $$0P:(DE-Juel1)129105$$aUngermann, Jörn$$b6$$ufzj
000904135 7001_ $$0P:(DE-HGF)0$$aLeisner, Thomas$$b7
000904135 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-14-1977-2021$$gVol. 14, no. 3, p. 1977 - 1991$$n3$$p1977 - 1991$$tAtmospheric measurement techniques$$v14$$x1867-1381$$y2021
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