Abstract
The spatial and temporal variability of snow accumulation near Dome Argus, Antarctica, is assessed using new snow pit and stake measurement data together with existing snow pit, ice core and automatic weather station records. Snow accumulation rate shows large inter-annual variations, but stable multi-decadal levels over the last seven centuries. Spatial variations in snow accumulation within the space of 50 km of Dome Argus are relatively small, probably thanks to the smooth topography. A comparison of theses accumulation observations with ECMWF reanalyses (ERA-40 and ERA-Interim) suggests ECMWF reanalysis captures the seasonal variations, but underestimates the overall snow accumulation at Dome Argus by ~50 %. The moisture sources for precipitation over Dome Argus are examined by means of a Lagrangian moisture source diagnostic, based on the tracing of specific humidity changes along air parcel trajectories, for the period 2000–2004 using operational ECMWF analysis data. Dome Argus mainly receives moisture from the mid-latitude (46 ± 4°S) South Indian Ocean, with a seasonal latitudinal shift of about 6°. Compared to other central East Antarctic deep ice core sites such as Dome F, Dome C, Vostok, and EPICA Dronning Maud Land, Dome Argus has a more southerly moisture origin, probably due to topographic influences on the moisture transport paths. These results have important implications for the interpretation of future ice cores at Dome Argus.
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Acknowledgments
Thanks to the members of the 21st and 26th CHINARE for field support. Thanks to Michiel Martijn Helsen for providing 1° × 1° ERA-40 data. We would like to acknowledge two anonymous referees for their comments and suggestions to improve the paper. This work was funded by the Natural Science Foundation of China (40825017, 41171052, 41176165), the State Oceanic Administration (CHINARE2012-02-02) and Ministry of Education (20110091110025).
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Wang, Y., Sodemann, H., Hou, S. et al. Snow accumulation and its moisture origin over Dome Argus, Antarctica. Clim Dyn 40, 731–742 (2013). https://doi.org/10.1007/s00382-012-1398-9
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DOI: https://doi.org/10.1007/s00382-012-1398-9