1 / 15

M. Schwikowski 1 , H.W. Gäggeler 1,2 , U. Schotterer 2 1 Paul Scherrer Institute, Switzerland

A 500 year palaeo record of sulphate and m ineral d ust from an A lpine ice core (Colle Gnifetti, Swiss Alps ). M. Schwikowski 1 , H.W. Gäggeler 1,2 , U. Schotterer 2 1 Paul Scherrer Institute, Switzerland 2 Department of Chemistry and Biochemistry, University of Berne, Switzerland.

erling
Download Presentation

M. Schwikowski 1 , H.W. Gäggeler 1,2 , U. Schotterer 2 1 Paul Scherrer Institute, Switzerland

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A 500 year palaeo record of sulphate and mineral dust from an Alpine ice core (Colle Gnifetti, Swiss Alps) M. Schwikowski1, H.W. Gäggeler 1,2, U. Schotterer2 1 Paul Scherrer Institute, Switzerland 2 Department of Chemistry and Biochemistry, University of Berne, Switzerland

  2. Motivation • Reconstruction of local and regional climate and atmospheric parameters • Documentation of the effects of anthropogenic emissions

  3. The ice core • Drilling site: Colle Gnifetti glacier saddle at 4450 m asl in the Monte Rosa area • Length: 124 m (bedrock) • Accumulation rate: 0.3 m water equiv. y-1 • Cold glacier: firn temperatures << 0°C

  4. Location

  5. Time period accessible by this ice core Dating error: ± 2 years Dating error: ± 20 years

  6. Mineral dust tracer Ca2+1977 Saharan dust event

  7. Mineral dust recordExtrem events: Saharan dust 2529 samples (5 per year) 1937 1901 1977

  8. Mineral dust record: long term trendIncreased Ca2+ from1450 to 1620 (LIA?) 5-year averages Little Ice Age in NH: cold, dry, increased atmospheric circulation

  9. Sea salt record (Strength of Westerlies) No trend 5-year averages

  10. nssSulphate recordAnthropogenic emissions, Saharan dust

  11. nssSulphate trendincreased concentrations from 1870-1970 5-year averages

  12. Trend in nssSO42-/Ca2+ ratioChange in mineral dust source or SO2 emissions?

  13. Source contribution to SO42- (eq L-1)

  14. Oldest ice

  15. Conclusion • No change in frequency of major Saharan dust transports • From 1450 to 1620 A.D. increased input of mineral dust and lower nssSO42-/Ca2+ ratios (probably related to LIA) • No change in strength of Westerlies • Change in area of mineral dust source (and probably in pre-industrial SO2 emissions)

More Related