Abstract
Ice cores provide a wealth of information about past climate and atmospheric circulation however a good understanding of the precipitation patterns, potential source regions and transport pathways is essential in their interpretation. Here we investigate the precipitation pathways for a transect of five new ice cores drilled in the southern Antarctic Peninsula and Ellsworth Land. We utilize in situ observations from automatic weather stations to confirm that the European Centre for Medium-Range Weather Forecasts ERA-Interim reanalysis data adequately captures annual and sub-annual variability, with evidence of a slight cold bias in the 2 m temperatures. Back trajectory analysis, from the British Atmospheric Data Centre trajectory service, reveals that warm and snowy years are associated with air masses that originate (5 days before reaching the site) from the Amundsen-Bellingshausen Sea, while cold and dry years are associated with air masses from the Antarctic continent. There is a clear seasonal migration in the trajectories at each site, reflecting the east to west migration of the Amundsen Sea Low, known to have a strong influence on climate in this region.
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References
Abram NJ, Thomas ER, McConnell JR, Mulvaney R et al (2010) Ice core evidence for a 20th century decline of sea ice in the Bellingshausen Sea, Antarctica. J Geophys Res 115
Baines PG, Fraedrich K (1989) Topographic effects on the mean tropospheric flow patterns around Antarctica. J Atmos Sci 46:3401–3415
Bracegirdle TJ, Marshall GJ (2012) The reliability of Antarctic tropospheric pressure and temperature in the latest global reanalyses. J Clim 25:7138–7146
Bromwich DH, Fogt RL (2004) Strong trends in the skill of the ERA-40 and NCEP-NCAR reanalyses in the high and midlatitudes of the Southern Hemisphere, 1958–2001. J Clim 17:4603–4619
Bromwich DH, Fogt RL, Hodges KI, Walsh JE (2007) A tropospheric assessment of the ERA-40, NCEP, and JRA-25 global reanalyses in the polar regions. J Geophys Res 112:D10111
Bromwich DH, Nicolas JP, Monaghan AJ, Lazzara MA et al (2013) Central West Antarctica among the most rapidly warming regions on Earth. Nat Geosci 6:139–145
Dee DP, Uppala SM, Simmons AJ, Berrisford P et al (2011) The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Quart J Roy Meteor Soc 137:553–597
Ding Q, Steig EJ, Battisti DS, Kuttel M (2011) Winter warming in West Antarctica caused by central tropical Pacific warming’. Nat Geosci 4:398–403
Fernandoy F, Meyer H, Tonelli M (2012) Stable water isotopes of precipitation and firn cores from the northern Antarctic Peninsula region as a proxy for climate reconstruction. Cryosphere 6:313–330
Fogt RL, Bromwich DH, Hines K (2011) Understanding the SAM influence on the South Pacific ENSO teleconnection. Clim Dyn 36:1555–1576
Fogt RL, Wovrosh AJ, Langen RA, Simmonds I (2012) The characteristic variability and connection to the underlying synoptic activity of the Amundsen-Bellingshausen Seas Low. J Geophys Res 117:D07111
Genthon C, Kaspari S, Mayewski P (2005) Interannual variability of the surface mass balance of West Antarctica from ITASE cores and ERA40 reanalyses, 1958–2000. Clim Dyn 24:759–770
Hosking JS, Orr A, Marshall GJ, Turner J, Phillips T (2013) The influence of the Amundsen-Bellingshausen Seas low on the climate of West Antarctica and its representation in coupled climate model simulations. J Clim 26:6633–6648
Lachlan-Cope T, Connolley W (2006) Teleconnections between the tropical Pacific and the Amundsen-Bellinghausens Sea: role of the El Niño/Southern Oscillation’. J Geophys Res 111:D23101
Lenaerts JTM, van den Broeke MR, van de Berg WJ et al (2012) A new, high-resolution surface mass balance map of Antarctica (1979–2010) based on regional atmospheric climate modeling. J Geophys Res 39:L04501
Medley B, Joughin I, Das SB, Steig EJ, Conway H et al (2013) Airborne-radar and ice-core observations of annual snow accumulation over Thwaites Glacier, West Antarctica confirm the spatiotemporal variability of global and regional atmospheric models. Geophys Res Lett 40(14):3649–3654
Miles GM, Marshall GJ, McConnell JR, Aristarain AJ (2008) Recent accumulation variability and change on the Antarctic Peninsula from the ERA40 reanalysis, I. IJ Climatol 28:1409–1422
Mulvaney R, Abram NJ, Hindmarsh RCA, Arrowsmith C, Fleet L, Triest J, Sime LC, Alemany O, Foord S (2012) Recent Antarctic Peninsula warming relative to Holocene climate and ice-shelf history. Nature 489:141–144
Nicolas J, Bromwich DH (2011) Precipitation changes in high Southern latitudes from global reanalyses: a Cautionary Tale. S. Geophysics 32:475–494
Scarchilli C, Frezzotti M, Ruti P (2011) Snow precipitation at four ice core sites in East Antarctica: provenance, seasonality and blocking factors. Clim Dyn 37:2107–2125
Schwerdtfeger W, Prohaska F (1956) The semi-annual pressure oscillation, its cause and effects. J Meteorol 13:217–218
Sinclair KE, Bertler NAN, Trompetter WJ, Baisden WT (2013) Seasonality of airmass pathways to coastal Antarctica: ramifications for interpreting high-resolution ice core records. J Clim 26:2065–2076
Steig EJ, Ding Q, White JWC, Kuttel M et al (2013) Recent climate and ice-sheet changes in West Antarctica compared with the past 2,000 years. Nature Geosci 6:372–375
Thomas ER, Bracegirdle TJ (2009) Improving ice core interpretation using in situ and reanalysis data. J Geophys Res 114:D20116. doi:10.1029/2009JD012263
Thomas ER, Marshall GJ, McConnell JR (2008) A doubling in accumulation in the western Antarctic Peninsula since 1850. Geophys Res Lett 35:L01706. doi:10.01029/02007GL032529
Thomas ER, Bracegirdle TJ, Turner J, Wolff EW (2013) A 308 year record of climate variability in West Antarctica. Geophys Res Lett 40:GL057782
Turner J, Comiso JC, Marshall GJ, Lachlan-Cope TA et al (2009) Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent. Geophys Res Lett 36:L08502
Turner J, Phillips T, Hosking JS, Marshall GJ, Orr A (2012) The Amundsen Sea low. IJ Climatol 33:1818–1829
Acknowledgments
This work was funded by the British Antarctic Survey core programme and part funded by the Natural Environment Research Council (Grant NE/J020710/1). We would like to thank ECMWF for the reanalysis data, BADC for their trajectory service, the Rothera Met team (S. Colwell and others) for deploying the AWS and D. Bromwich and an anonymous reviewer for their valued suggestions.
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Thomas, E.R., Bracegirdle, T.J. Precipitation pathways for five new ice core sites in Ellsworth Land, West Antarctica. Clim Dyn 44, 2067–2078 (2015). https://doi.org/10.1007/s00382-014-2213-6
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DOI: https://doi.org/10.1007/s00382-014-2213-6