Chlorine Activation on Cirrus Clouds in the tropical UTLS
TL;DRAbstract
Chlorine monoxide (ClO) is one of the main ozone killers in the polar stratosphere in late winter/early spring, where it is formed from hydrogen chloride (HCl) and chlorine nitrate (ClONO2) on nitric acid trihydrate (NAT) and ice particles inside polar stratospheric clouds. It has been suggested that ClO might play a similar though less important role for ozone loss at lower altitudes (Keim et al., 1996; Logan, 1999; Solomon et al., 1997), with chlorine activation allegedly proceeding on ice particles inside cirrus clouds and to some extent also on background aerosol. In high and mid-latitudes, ClO activation on ice clouds and background aerosol near the tropopause has indeed been observed (Borrmann et al., 1997; Borrmann et al., 1996; Thornton et al., 2003). The question remains, whether this process also takes place in the tropics.
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Chlorine monoxide (ClO) is one of the main ozone killers in the polar stratosphere in late winter/early spring, where it is formed from hydrogen chloride (HCl) and chlorine nitrate (ClONO2) on nitric acid trihydrate (NAT) and ice particles inside polar stratospheric clouds. It has been suggested that ClO might play a similar though less important role for ozone loss at lower altitudes (Keim et al., 1996; Logan, 1999; Solomon et al., 1997), with chlorine activation allegedly proceeding on ice particles inside cirrus clouds and to some extent also on background aerosol. In high and mid-latitudes, ClO activation on ice clouds and background aerosol near the tropopause has indeed been observed (Borrmann et al., 1997; Borrmann et al., 1996; Thornton et al., 2003). The question remains, whether this process also takes place in the tropics.
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