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| Titel |
The use of satellite-based remote sensing to quantify the contribution of volcanoes to the global SO2 budget |
| VerfasserIn |
Helen Thomas, I. Matthew Watson, Simon Carn |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036030
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| Zusammenfassung |
| Volcanic degassing is a major contributor to the global sulphur dioxide (SO2) budget,
characterised by permanent quiescent emissions in the lower troposphere punctuated with
sporadic and spatially variable explosive eruptions into the upper troposphere and lower
stratosphere (UTLS). The Moderate Resolution Imaging Spectroradiometer (MODIS),
the Atmospheric Infrared Sounder (AIRS) and the Ozone Monitoring Instrument
(OMI) on the A-Train suite of satellites, have the combined ability to measure both
passive and explosive volcanic emissions of SO2. Near-coincident thermal infrared
(TIR; MODIS and AIRS) and ultraviolet (UV; OMI) observations with different
vertical sensitivity allow SO2 emissions in the UTLS to be delineated from lower
tropospheric degassing, with ramifications for climate impacts. This study compares
MODIS and AIRS TIR and OMI UV retrievals of SO2 for a number of recent, large
volcanic eruptions on a case-by-case basis in order to compare the performance of
each of the sensors for different eruptive scenarios (latitude, plume altitude, season
etc.). Using this approach, we attempt to quantify rates of SO2 loading, residence
times, and the overall performance of each of the sensors in a range of settings in
order to produce a global estimate of volcanic SO2 emissions to the atmosphere. |
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