Preprints
https://doi.org/10.5194/cpd-9-1841-2013
https://doi.org/10.5194/cpd-9-1841-2013
05 Apr 2013
 | 05 Apr 2013
Status: this preprint was under review for the journal CP but the revision was not accepted.

Dust and associated trace element fluxes in a firn core from the coastal East Antarctica and its linkages with the Southern Hemisphere climate variability over the last ~ 50 yr

C. M. Laluraj, M. Thamban, and K. Satheesan

Abstract. High-resolution records of dust and trace element fluxes were studied in a firn core from the coastal Dronning Maud Land (cDML) in East Antarctica to identify the influence of climate variability on accumulation of these components over the past ~ 50 yr. A doubling of dust deposition was observed since 1985, coinciding with a shift in the Southern Annular Mode (SAM) index to positive values and associated increase in the wind speed. Back-trajectories showed that an increase in dust deposition is associated with the air parcels originating from north-west of the site, possibly indicating its origin from the Patagonian region. Our results suggest that while multiple processes could have influenced the increased dust formation, shift in SAM had a dominant influence on its transport. It is observed that since the 1985s the strength of easterlies increased significantly over the cDML region, which could sink air and dust material to the region that were brought by the westerlies through mass compensation. The correlation between the dust flux and δ18O records further suggest that enhanced dust flux in the firn core occurred during periods of colder atmospheric temperature, which reduced the moisture content and increased dust fall. Interestingly, the timing and amplitude of the insoluble dust peaks matched remarkably well with the fluxes of Ba, Cr, Cu, and Zn confirming that dust was the main carrier/source of atmospheric trace elements to East Antarctica during the recent past.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
C. M. Laluraj, M. Thamban, and K. Satheesan
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
C. M. Laluraj, M. Thamban, and K. Satheesan
C. M. Laluraj, M. Thamban, and K. Satheesan

Viewed

Total article views: 1,946 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
1,056 765 125 1,946 100 119
  • HTML: 1,056
  • PDF: 765
  • XML: 125
  • Total: 1,946
  • BibTeX: 100
  • EndNote: 119
Views and downloads (calculated since 05 Apr 2013)
Cumulative views and downloads (calculated since 05 Apr 2013)

Cited

Latest update: 28 May 2024