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A tropical West Pacific OH minimum and implications for stratospheric composition

Most of the short-lived biogenic and anthropogenic chemical species that are emitted into the atmosphere break down efficiently by reaction with OH and do not reach the stratosphere. Here we show the existence of a pronounced minimum in the tropospheric column of ozone over the West Pacific, the main source region for stratospheric air, and suggest a corresponding minimum of the tropospheric column of OH.

Effects of stratospheric ozone recovery on photochemistry and ozone air quality in the troposphere

In this study, the authors examine the implications of stratospheric ozone recovery for the tropospheric chemistry and ozone air quality with a global chemical transport model (GEOS-Chem).

Further evidence of important environmental information content in red-to-green ratios as depicted in paintings by great masters

In this paper, the authors examine sunsets painted by famous artists as proxy information for the aerosol optical depth after major volcanic eruptions.

Characterization of submicron aerosols during a month of serious pollution in Beijing, 2013

In January 2013, Beijing experienced several serious haze events. To achieve a better understanding of the characteristics, sources and processes of aerosols during this month, an Aerodyne high-resolution time-of-flight aerosol mass spectrometer was deployed at an urban site between 1 January and 1 February 2013 to obtain the size-resolved chemical composition of non-refractory submicron particles.

Uncertainty analysis of projections of ozone-depleting substances: mixing ratios, EESC, ODPs, and GWPs

Here the authors present a comprehensive uncertainty analysis of future mixing ratios of ozone-depleting substances (ODPs), levels of equivalent effective stratospheric chlorine (EESC), ozone depletion potentials, and global warming potentials (GWPs).

EESC, ODPs, and GWPs">Read more

Incidence of rough and irregular atmospheric ice particles from Small Ice Detector 3 measurements

2D light-scattering patterns were obtained in situ for the first time using the Small Ice Detector 3 probe during several flights in a variety of mid-latitude mixed-phase and cirrus clouds.

Microphysical properties and high ice water content in continental and oceanic mesoscale convective systems and potential implications for commercial aircraft at flight altitude

Two complementary case studies are conducted to analyse convective system properties in the region where strong cloud-top lidar backscatter anomalies are observed as reported by Platt et al. (2011).

Arctic stratospheric dehydration – Part 1: Unprecedented observation of vertical redistribution of water

This paper presents high-resolution measurements of water vapour, aerosols and clouds in the Arctic stratosphere in January and February 2010 carried out by in situ instrumentation on balloon sondes and high-altitude aircraft combined with satellite observations.

Quantifying aerosol mixing state with entropy and diversity measures

This paper presents the first quantitative metric for aerosol population mixing state, defined as the distribution of per-particle chemical species composition.

Heterogeneous formation of polar stratospheric clouds – Part 2: Nucleation of ice on synoptic scales

This paper provides compelling evidence for the importance of heterogeneous nucleation, likely on solid particles of meteoritic origin, and of small-scale temperature fluctuations, for the formation of ice particles in the Arctic stratosphere.

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