Synoptic conditions and atmospheric moisture pathways associated with virga and precipitation over coastal Adélie Land in Antarctica
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Published:2020-05-27
Issue:5
Volume:14
Page:1685-1702
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Jullien Nicolas, Vignon ÉtienneORCID, Sprenger Michael, Aemisegger Franziska, Berne Alexis
Abstract
Abstract. Precipitation falling over the coastal regions of Antarctica often experiences low-level sublimation within the dry katabatic layer. The amount of water that reaches the ground surface is thereby considerably reduced. This paper investigates the synoptic conditions and the atmospheric transport pathways of moisture that lead to either virga – when precipitation is completely sublimated – or actual surface precipitation events over coastal Adélie Land, East Antarctica. For this purpose, the study combines ground-based lidar and radar measurements at Dumont d'Urville station (DDU), Lagrangian back trajectories, Eulerian diagnostics of extratropical cyclones and fronts, and moisture source estimations. It is found that precipitating systems at DDU are associated with warm fronts of cyclones that are located to the west of Adélie Land. Virga – corresponding to 36 % of the hours with precipitation above DDU – and surface precipitation cases are associated with the same precipitating system but they correspond to different phases of the event. Virga cases more often precede surface precipitation. They sometimes follow surface precipitation in the warm sector of the cyclone's frontal system, when the associated cyclone has moved to the east of Adélie Land and the precipitation intensity has weakened. On their way to DDU, the air parcels that ultimately precipitate above the station experience a large-scale lifting across the warm front. The lifting generally occurs earlier in time and farther from the station for virga than for precipitation. It is further shown that the water contained in the snow falling above DDU during pre-precipitation virga has an oceanic origin farther away (about 30∘ more to the west) from Adélie Land than the one contained in the snow that precipitates down to the ground surface.
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference57 articles.
1. Aemisegger, F. and Papritz, L.: A Climatology of Strong Large-Scale Ocean
Evaporation Events. Part I: Identification, Global Distribution, and
Associated Climate Conditions, J. Climate, 31, 7287–7312,
https://doi.org/10.1175/JCLI-D-17-0591.1, 2018. a 2. Aemisegger, F., Pfahl, S., Sodemann, H., Lehner, I., Seneviratne, S. I., and Wernli, H.: Deuterium excess as a proxy for continental moisture recycling and plant transpiration, Atmos. Chem. Phys., 14, 4029–4054, https://doi.org/10.5194/acp-14-4029-2014, 2014. a 3. Agosta, C., Amory, C., Kittel, C., Orsi, A., Favier, V., Gallée, H., van den Broeke, M. R., Lenaerts, J. T. M., van Wessem, J. M., van de Berg, W. J., and Fettweis, X.: Estimation of the Antarctic surface mass balance using the regional climate model MAR (1979–2015) and identification of dominant processes, The Cryosphere, 13, 281–296, https://doi.org/10.5194/tc-13-281-2019, 2019. a, b 4. Auton, A.: Red Blue Colormap, MATLAB Central File Exchange, available at: https://www.mathworks.com/matlabcentral/fileexchange/25536-red-blue-colormap,
last access: 1 April 2020. a, b 5. Bailey, A., Singh, H. K. A., and Nusbaumer, J.: Evaluating a Moist Isentropic
Framework for Poleward Moisture Transport: Implications for Water Isotopes
Over Antarctica, Geophys. Res. Lett., 46, 7819–7827,
https://doi.org/10.1029/2019GL082965, 2019. a
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