Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023
Abstract Contrasting the extensive research on summer atmospheric rivers (ARs) in the Antarctic Peninsula (AP), winter AR impacts are less understood. This study examines a unique warming event from 1 to 3 July 2023, using in situ winter observations and ERA5 reanalysis. On 2 July, Frei station expe...
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| Format: | Article |
| Language: | English |
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Wiley
2024-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL108391 |
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| author | D. Bozkurt J. F. Carrasco R. R. Cordero F. Fernandoy A. Gómez‐Contreras B. Carrillo B. Guan |
| author_facet | D. Bozkurt J. F. Carrasco R. R. Cordero F. Fernandoy A. Gómez‐Contreras B. Carrillo B. Guan |
| author_sort | D. Bozkurt |
| collection | DOAJ |
| description | Abstract Contrasting the extensive research on summer atmospheric rivers (ARs) in the Antarctic Peninsula (AP), winter AR impacts are less understood. This study examines a unique warming event from 1 to 3 July 2023, using in situ winter observations and ERA5 reanalysis. On 2 July, Frei station experienced an extreme warm event with a temperature of 2.7°C and a significant rise in the freezing level, coinciding with winter rainfall. A pressure dipole pattern over the AP, with contrasting circulations over Bellingshausen and Weddell Seas, facilitated an AR, carrying warm, humid air initially from South America/Atlantic and then the southeast Pacific. This shift resulted in anomalous water stable isotope composition in precipitation. Trends suggest a strengthening winter pressure dipole, associated with increased AR frequency and higher temperatures in northern AP. These findings highlight the importance of winter observations in exploring AR impacts, bridging knowledge gaps about winter AR behaviors. |
| format | Article |
| id | doaj-art-9db1c8c7c4e049dab957e850ce5f4295 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9db1c8c7c4e049dab957e850ce5f42952025-08-20T02:04:21ZengWileyGeophysical Research Letters0094-82761944-80072024-07-015113n/an/a10.1029/2024GL108391Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023D. Bozkurt0J. F. Carrasco1R. R. Cordero2F. Fernandoy3A. Gómez‐Contreras4B. Carrillo5B. Guan6Departamento de Meteorología Universidad de Valparaíso Valparaíso ChileCentro de Investigación Gaia Antártica Universidad de Magallanes Punta Arenas ChileDepartamento de Física Universidad de Santiago de Chile Santiago ChileFacultad de Ingeniería Universidad Nacional Andrés Bello Viña del Mar ChileDepartamento de Geofísica Universidad de Chile Santiago ChileCentro de Investigación Gaia Antártica Universidad de Magallanes Punta Arenas ChileJoint Institute for Regional Earth System Science and Engineering University of California Los Angeles Los Angeles CA USAAbstract Contrasting the extensive research on summer atmospheric rivers (ARs) in the Antarctic Peninsula (AP), winter AR impacts are less understood. This study examines a unique warming event from 1 to 3 July 2023, using in situ winter observations and ERA5 reanalysis. On 2 July, Frei station experienced an extreme warm event with a temperature of 2.7°C and a significant rise in the freezing level, coinciding with winter rainfall. A pressure dipole pattern over the AP, with contrasting circulations over Bellingshausen and Weddell Seas, facilitated an AR, carrying warm, humid air initially from South America/Atlantic and then the southeast Pacific. This shift resulted in anomalous water stable isotope composition in precipitation. Trends suggest a strengthening winter pressure dipole, associated with increased AR frequency and higher temperatures in northern AP. These findings highlight the importance of winter observations in exploring AR impacts, bridging knowledge gaps about winter AR behaviors.https://doi.org/10.1029/2024GL108391atmospheric riverwarm eventsclimate extremesAntarcticarainfallmoisture transport |
| spellingShingle | D. Bozkurt J. F. Carrasco R. R. Cordero F. Fernandoy A. Gómez‐Contreras B. Carrillo B. Guan Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 Geophysical Research Letters atmospheric river warm events climate extremes Antarctica rainfall moisture transport |
| title | Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 |
| title_full | Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 |
| title_fullStr | Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 |
| title_full_unstemmed | Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 |
| title_short | Atmospheric River Brings Warmth and Rainfall to the Northern Antarctic Peninsula During the Mid‐Austral Winter of 2023 |
| title_sort | atmospheric river brings warmth and rainfall to the northern antarctic peninsula during the mid austral winter of 2023 |
| topic | atmospheric river warm events climate extremes Antarctica rainfall moisture transport |
| url | https://doi.org/10.1029/2024GL108391 |
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