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- Title
Relationship Between Weather Regimes and Atmospheric Rivers in East Antarctica.
- Authors
Pohl, Benjamin; Favier, Vincent; Wille, Jonathan; Udy, Danielle G; Vance, Tessa R; Pergaud, Julien; Dutrievoz, Niels; Blanchet, Juliette; Kittel, Christoph; Amory, Charles; Krinner, Gerhard; Codron, Francis
- Abstract
Here, we define weather regimes in the East Antarctica—Southern Ocean sector based on daily anomalies of 700 hPa geopotential height derived from ERA5 reanalysis during 1979–2018. Most regimes and their preferred transitions depict synoptic‐scale disturbances propagating eastwards off the Antarctic coastline. While regime sequences are generally short, their interannual variability is strongly driven by the polarity of the Southern Annular Mode (SAM). Regime occurrences are then intersected with atmospheric rivers (ARs) detected over the same region and period. ARs are equiprobable throughout the year, but clearly concentrate during regimes associated with a strong atmospheric ridges/blockings on the eastern part of the domain, which act to channel meridional advection of heat and moisture from the lower latitudes towards Antarctica. Both regimes and ARs significantly shape climate variability in Antarctica. Regimes favorable to AR occurrences are associated with anomalously warm and humid conditions in coastal Antarctica and, to a lesser extent, the hinterland parts of the Antarctic plateau. These anomalies are strongly enhanced during AR events, with warmer anomalies and dramatically amplified snowfall amounts. Large‐scale conditions favoring AR development are finally explored. They show weak dependency to the SAM, but particularly strong atmospheric ridges/blockings over the Southern Ocean appear as the most favorable pattern, in which ARs can be embedded, and to which they contribute. Key Points: Atmospheric rivers (ARs) reaching East Antarctica show strong association with synoptic weather regimesARs enhance the positive temperature and snowfall anomalies associated with the regimesARs occur when the synoptic configuration is anomalously strong over the Southern Ocean
- Subjects
ATMOSPHERIC rivers; ATMOSPHERIC thermodynamics; WATER vapor transport; ANTARCTIC environmental conditions; ANTARCTIC oscillation
- Publication
Journal of Geophysical Research. Atmospheres, 2021, Vol 126, Issue 24, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2021JD035294