Weather types around the Kerguelen Islands (south of the Indian Ocean) (2024)

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Data creators : Benjamin Pohl [1] [2], Victoire Buffet [3] [1], Vincent Favier [3]
Data collector : Benjamin Pohl [1] [2], Vincent Favier [3], Victoire Buffet [3] [1]
[1] : Laboratoire Biogéosciences (UMR 6282) (Université de Bourgogne)
[2] : Observatoire des Sciences de l'Univers - Terre, Homme, Environnement, Temps, Astronomie (UAR 3245) (Université de Bourgogne)
[3] : Institut des Géosciences de l’Environnement (UMR 5001)
Description :
Daily weather regimes are defined around the Kerguelen Islands (Southern Ocean) on the basis of daily
500-hPa geopotential height anomalies derived from the ERA5 ensemble reanalysis over the period 1979-2018. Ten regimes are retained as significant. Their occurrences are highly consistent across reanalysis ensemble members. Regimes show weak seasonality and nonsignificant long-term trends in their occurrences. Their sequences are usually short (1–3 days), with extreme persistence values above 10 days. Seasonal regime frequency is mostly driven by the phase of the southern annular mode over Antarctica, midlatitude dynamics over the Southern Ocean such as the Pacific–South American mode, and, to a lesser extent, tropical variability, with significant but weaker relationships with El Niño–Southern Oscillation. At the local scale over the Kerguelen Islands, regimes have a strong influence on measured atmospheric and oceanic variables, including minimum and maximum air temperature, mostly driven by horizontal advections, seawater temperature recorded 5 m below the surface, wind speed, and sea level pressure. Relationships are weaker for precipitation amounts. Regimes also modify regional contrasts between observational sites in Kerguelen, highlighting strong exposure contrasts. The regimes allow us to improve our understanding of weather and climate variability and interactions in this region.
Discipline :
meteorology & atmospheric sciences (sciences of the universe)

General metadata

Data acquisition date : from 2021 ongoing
Data acquisition methods :
Update periodicity : as needed
Language : English (eng)
Formats : application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Audience : Research

Coverages

Spatial coverage :

Time coverage :

  • Depuis 1979: 1979-01-01 and after
Publications :
  • Pohl B, T Saucède, V Favier, J Pergaud, D Verfaillie, J-P Féral, Y Krasniqi & Y Richard (2021) Recent climate variability around the Kerguelen Islands (Southern Ocean) seen through weather regimes. Journal of Applied Meteorology and Climatology, 60, 711-731. (doi:10.1175/JAMC-D-20-0255.1)

Data

1 file

ker_wt.xlsx

Published : 14/06/2024 11:57 Size : 211.41 kB

Description : Weather types (numbered 1 to 10) around the Kerguelen Islands, based on ERA5 reanlaysis

Record created 14 Jun 2024 by Benjamin Pohl.
Local identifier: FR-13002091000019-2024-06-14.

dat@Biogéosciences

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Terms of use
Université de Bourgogne, Université de Franche-Comté, UTBM, AgroSup Dijon, ENSMM, BSB, Arts des Metiers