This assessment, by the United Nations Environment Programme (UNEP) Environmental
Effects Assessment Panel (EEAP), one of three Panels informing the Parties to the Montreal …

Volcanic eruptions impact climate, subtly and profoundly. The size of an eruption is only
loosely correlated with the severity of its climate effects, which can include changes in …

The latter months of 2020 and 2021 were marked by two of the largest Antarctic ozone holes
on record. That such large ozone holes occurred despite ongoing ozone recovery raises …

Abstract The January 2022 eruption of Hunga Tonga‐Hunga Ha'apai (HT‐HH) caused the
largest enhancement in stratospheric aerosol loading in decades and produced an …

We have analyzed near-global stratospheric data (and mesospheric data as well for H 2 O)
in terms of absolute abundances, variability, and trends for O 3, H 2 O, HCl, N 2 O, and HNO …

We developed a technique to classify the composition of enhanced aerosol layers as either
smoke or sulfuric acid aerosol using extinction spectra from the Stratospheric Aerosol and …

The 1257 CE eruption of Mount Samalas (Indonesia) is the source of the largest
stratospheric injection of volcanic gases in the Common Era. Sulfur dioxide emissions …

Polar stratospheric clouds (PSCs) are a driver for ozone depletion in the lower polar
stratosphere. They provide surface for heterogeneous reactions activating chlorine and …

The deposited dust provides a large surface for heterogeneous ozone uptake reactions in
urban regions. Prior studies have barely considered the effect of the photothermal …

Aerosol backscatter coefficients were calculated using multiwavelength aerosol extinction
products from the SAGE II and III/ISS instruments (SAGE: Stratospheric Aerosol and Gas …