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Vertical profiles of aerosol extinction coefficients were measured by amicro-pulse lidar at Naqu (31.5° N, 92.1° E; 4508 m a.m.s.l.),a meteorological station located on the central part of theTibetan Plateau during summer 2011. Observations show a persistent maximumin aerosol extinction coefficients in the upper troposphere–lowerstratosphere (UTLS). These aerosol layers were generally located at analtitude of 18–19 km a.m.s.l., 1–2 km higher than the tropopause, withbroad layer depth ranging approximately 3–4 km and scattering ratio of 4–9.Daily averaged aerosol optical depths (AODs) of the enhanced aerosol layersin UTLS over the Tibetan Plateau varied from 0.007 to 0.030, in agreementwith globally averaged levels of 0.018 ± 0.009 at 532 nm from previousobservations, but the percentage contributions of the enhanced aerosollayers to the total AOD over the Tibetan Plateau are higher than thoseobserved elsewhere. The aerosol layers in UTLS wore off gradually with thereducing intensity of the Asian monsoon over the Tibetan Plateau at the endof August. The eruption of Nabro volcano on 13 June 2011 is considered animportant factor to explain the enhancement of tropopause aerosols observedthis summer over the Tibetan Plateau

Lidar-observed enhancement of aerosols in the upper troposphere and lower stratosphere over the Tibetan Plateau induced by the Nabro volcano eruption