High-resolution dynamical downscaling of re-analysis data over the Kerguelen Islands using the WRF model

Ricardo Fonseca, Javier Martin-Torres

Research output: Contribution to journalArticle

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Abstract

We have used the Weather Research and Forecasting (WRF) model to simulate the climate of the Kerguelen Islands (49° S, 69° E) and investigate its inter-annual variability. Here, we have dynamically downscaled 30 years of the Climate Forecast System Reanalysis (CFSR) over these islands at 3-km horizontal resolution. The model output is found to agree well with the station and radiosonde data at the Port-aux-Français station, the only location in the islands for which observational data is available. An analysis of the seasonal mean WRF data showed a general increase in precipitation and decrease in temperature with elevation. The largest seasonal rainfall amounts occur at the highest elevations of the Cook Ice Cap in winter where the summer mean temperature is around 0 °C. Five modes of variability are considered: conventional and Modoki El Niño-Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), Subtropical IOD (SIOD) and Southern Annular Mode (SAM). It is concluded that a key mechanism by which these modes impact the local climate is through interaction with the diurnal cycle in particular in the summer season when it has a larger magnitude. One of the most affected regions is the area just to the east of the Cook Ice Cap extending into the lower elevations between the Gallieni and Courbet Peninsulas. The WRF simulation shows that despite the small annual variability, the atmospheric flow in the Kerguelen Islands is rather complex which may also be the case for the other islands located in the Southern Hemisphere at similar latitudes.

Original languageEnglish
Pages (from-to)1259-1277
Number of pages19
JournalTheoretical and Applied Climatology
Volume135
Issue number3-4
DOIs
Publication statusPublished - Feb 15 2019
Externally publishedYes

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downscaling
weather
ice cap
climate
Southern Oscillation
summer
radiosonde
Southern Hemisphere
temperature
data analysis
rainfall
winter
simulation
station
Indian Ocean Dipole

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

High-resolution dynamical downscaling of re-analysis data over the Kerguelen Islands using the WRF model. / Fonseca, Ricardo; Martin-Torres, Javier.

In: Theoretical and Applied Climatology, Vol. 135, No. 3-4, 15.02.2019, p. 1259-1277.

Research output: Contribution to journalArticle

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