• A personal note on IGBP and the social sciences


    Humans are an integral component of the Earth system as conceptualised by IGBP. João Morais recalls key milestones in IGBP’s engagement with the social sciences and offers some words of advice for Future Earth.
  • IGBP and Earth observation:
    a co-evolution


    The iconic images of Earth beamed back by the earliest spacecraft helped to galvanise interest in our planet’s environment. The subsequent evolution and development of satellites for Earth observation has been intricately linked with that of IGBP and other global-change research programmes, write Jack Kaye and Cat Downy .

Uncertainties in gas-phase atmospheric iodine chemistry

Atmospheric Environment (2012)

Sommariva R, Bloss W J and von Glasow R

DOI: 10.1016/j.atmosenv.2012.04.032

Vol 57, pp 219-232

Abstract

We present a comprehensive chemical mechanism for gas-phase iodine, to be used for modelling tropospheric chemistry. The mechanism has been compiled from evaluated data and individual literature studies, where available; a number of key processes have not been studied experimentally or theoretically and in these cases estimations have been made. The uncertainty associated with these assumptions is evaluated. We analyze the mechanism using a box-model under a variety of boundary layer scenarios – representative of environments where iodine species have been observed – to study the response of the chemical system to changes in the kinetic parameters of selected reactions. We focus in particular on key species such as IO, OIO, INO3 and I2Oy and the impact of iodine chemistry on ozone formation and HOx levels. The results indicate that the chemical system is most sensitive to reactions leading to comparatively stable iodine compounds, which should be a focus of future laboratory studies.

Share this page
Tell a friend (opens in new window)
Follow us

Please note!

IGBP closed at the end of 2015. This website is no longer updated.

No events available

  • Global Change Magazine No. 84


    This final issue of the magazine takes stock of IGBP’s scientific and institutional accomplishments as well as its contributions to policy and capacity building. It features interviews of several past...

  • Global Change Magazine No. 83


    This issue features a special section on carbon. You can read about peak greenhouse-gas emissions in China, the mitigation of black carbon emissions and the effect of the 2010-2011 La Niña event on gl...
RECOMMENDED