CALIPSO and SAGE-II observations show a positive trend (+0.004 over the period 1996–2014) in UTLS aerosol optical depth during summer which causes a regional radiative forcing of around −0.1 W•m −2 over that 18 year period 12 .
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CALIPSO and SAGE-II observations show a positive trend (+0.004 over the period 1996–2014) in UTLS aerosol optical depth during summer which causes a regional radiative forcing of around −0.1 W•m −2 over that 18 year period 12 .