Continuous 25-years aerosol records at coastal Antarctica: 1. Inter-annual variability of ionic compounds and links to climate indices.

The aerosol climatology at the coastal Antarctic Neumayer Station (NM) was investigated based on continuous, 25 years long observations of biogenic sulfur components (methanesulfonate and non sea salt sulfate), sea salt and nitrate. Whilst significant long-term trends could only be detected for nitr...

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Bibliographic Details
Published in:Tellus B: Chemical and Physical Meteorology
Main Authors: Weller, Rolf, Wagenbach, D., Legrand, M., Elsässer, C., Tian-Kunze, X., König-Langlo, Gert
Format: Article in Journal/Newspaper
Language:unknown
Published: Wiley-Blackwell 2011
Subjects:
Antarctic
Neumayer
Neumayer Station
Dumont d’Urville
Antarc*
Antarctica
Sea ice
Online Access:https://epic.awi.de/id/eprint/22669/
https://epic.awi.de/id/eprint/22669/1/Wel2010b.pdf
https://doi.org/10.1111/j.1600-0889.2011.00542.x
https://hdl.handle.net/10013/epic.38264
https://hdl.handle.net/10013/epic.38264.d001
Description
Summary:The aerosol climatology at the coastal Antarctic Neumayer Station (NM) was investigated based on continuous, 25 years long observations of biogenic sulfur components (methanesulfonate and non sea salt sulfate), sea salt and nitrate. Whilst significant long-term trends could only be detected for nitrate (-3.6±2.5% per year between 1983 and 1993 and +4.0±3.2% per year from 1993-2007), non-harmonic periodicities between 2 and 5 years were typical for all species. Dedicated time series analyses revealed that relations to sea ice extent and various circulation indices are weak at best or not significant. In particular, no consistent link between sea ice extent and sea salt loadings was evident suggesting only a rather local relevance of the NM sea salt record. Nevertheless, a higher Southern Annular Mode index tended to entail a lower biogenic sulfur signal. In examining the spatial uniformity of the NM findings we contrasted them to respective 17 years records from the coastal Dumont d’Urville Station (DDU). We found similar long term trends for nitrate, indicating an Antarctic-wide but not identifiable atmospheric signal, though any significant impact of solar activity or pollution could be ruled out. No inter-site variability on the multi annual scale was evident for the other ionic compounds.

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