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| THE CONTRIBUTION OF EXPLOSIVE VOLCANISM TO GLOBAL ATMOSPHERIC SULFUR-DIOXIDE CONCENTRATIONS |
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| Author(s): BLUTH GJS, SCHNETZLER CC, KRUEGER AJ, WALTER LS |
| Source: NATURE Volume: 366 Issue: 6453 Pages: 327-329 Published: NOV 25 1993 |
| Times Cited: 117 References: 18 |
| Abstract: SULPHUR dioxide from volcanic eruptions may have a significant effect on the Earth's climate and atmospheric chemistry, and it is therefore important to quantify outgassing rates for all types of volcanic activity. Non-explosive volcanoes (for example, Mount Etna) outgas at relatively constant rates, providing an annual flux of about 9 million tons (Mt) SO2 (ref. 1). By contrast, the outgassing from volcanoes prone to explosive eruptions (such as Mount Pinatubo) is sporadic and much more difficult to quantify. The total annual volcanic SO2 flux is therefore poorly constrained, with ground-based estimates1-8 ranging from 1.5 to 50 Mt-up to one-quarter of the estimated current anthropogenic contribution. The Total Ozone Mapping Spectrometer aboard the NASA satellite Nimbus 7 recorded SO2 emissions from explosive eruptions from November 1978 to May 1993. We use these data to show that the annual flux from explosive volcanism is of the order of 4 Mt SO2, less than half of the non-explosive output. Thus it seems that the total volcanic emission of SO2 to the Earth's atmosphere is about 13 Mt yr-1, which is only 5-10% of the current anthropogenic flux. |
| Document Type: Article |
| Language: English |
| Reprint Address: BLUTH, GJS (reprint author), NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, CODE 921, GREENBELT, MD 20771 USA |
Addresses:
1. UNIV MARYLAND, DEPT GEOG, COLL PK, MD 20742 USA
2. NASA, GODDARD SPACE FLIGHT CTR, EARTH SCI DIRECTORATE, GREENBELT, MD 20771 USA |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: MJ705 |
| ISSN: 0028-0836 |
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