Objectif
SHIVA aims to reduce uncertainties in present and future stratospheric halogen loading and ozone depletion resulting from climate feedbacks between emissions and transport of ozone depleting substances (ODS). Of particular relevance will be studies of short and very short-lived substances (VSLS) with climate-sensitive natural emissions. We will perform field studies of ODS production, emission and transport in understudied, but critical, regions of the tropics using ship, aircraft and ground-based instrumentation. We will parameterise potential climate sensitivities of emissions based on inter-dependencies derived from our own field studies, and surveys of ongoing work in this area. We will study the chemical transformation of ODS during transport from the surface to the tropical tropopause layer (TTL), and in the stratosphere, using a combination of aircraft and balloon observations together with process-oriented meso-scale modelling. These investigations will be corroborated by space-based remote sensing of marine phytoplankton biomass as a possible proxy for the ocean-atmosphere flux of ODS. From this a systematic emission inventory of VSLS ODS will be established to allow construction of future-climate scenarios. The impact of climate-sensitive feedbacks between transport and the delivery of ODS to the stratosphere, and their lifetime within it, will be studied using tracer observations and modelling. Further global modelling will assess the contribution of all ODS, including VSLS (which have hitherto normally been excluded from such models) to past, present and future ozone loss. Here, the sensitivity of natural ODS emissions to climate change parameters will be used in combination with standard IPCC climate model scenarios in order to drive measurement-calibrated chemical transport model (CTM) simulations for present and future stratospheric ozone; to better predict the rate, timing and climate-sensitivity of ozone-layer recovery.
Champ scientifique
Programme(s)
Thème(s)
Appel à propositions
FP7-ENV-2008-1
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Régime de financement
CP-FP - Small or medium-scale focused research projectCoordinateur
69117 Heidelberg
Allemagne
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Participants (13)
NR4 7TJ Norwich
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60323 Frankfurt Am Main
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27570 Bremerhaven
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1180 Bruxelles / Brussel
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CB2 1TN Cambridge
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24148 Kiel
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75794 Paris
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LS2 9JT Leeds
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2027 Kjeller
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28359 Bremen
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51147 Koln
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50603 Kuala Lumpur
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Participation terminée
24148 KIEL
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