Extreme high temperature events in the South Orkney islands: the role atmospheric rivers and localised Föhn winds ...
<!--!introduction!--> We present the first comparison of extreme near-surface high temperatures in the South Orkney Islands using synoptic meteorological observations from the Signy and Orcadas stations. Based on the station records above the top 5 th percentile thresholds, the key features of...
| Main Authors: | , , , , , , |
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| Format: | Conference Object |
| Language: | unknown |
| Published: |
GFZ German Research Centre for Geosciences
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.57757/iugg23-2964 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018893 |
| Summary: | <!--!introduction!--> We present the first comparison of extreme near-surface high temperatures in the South Orkney Islands using synoptic meteorological observations from the Signy and Orcadas stations. Based on the station records above the top 5 th percentile thresholds, the key features of the extremes are examined. We find that extreme warm events at both stations often involve the combined effect of synoptically driven atmospheric rivers (ARs) and localized Föhn winds. Their characteristics however differ distinctly between these two stations. The extreme warm events at Signy primarily involve ARs originated from the Andes and/or the Southern Atlantic Ocean, where the warm moist-rich airs are advected towards the islands rapidly by strong northerly winds. Extreme warm events at Orcadas nevertheless mainly involve ARs originated from the Pacific Ocean. To better understand the development of the typical extreme warm events, high resolution model simulations are performed using the nested MetUM ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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