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A model‐based study of foehn effect impacts on the near‐surface climate over the Larsen ice shelf at the
Antarctic Peninsula
Günther Heinemann, Rolf Zentek, Laura Knopp
Environmental Meteorology, University of Trier, Germany
SPP 1158
AntarktisforschungGrant:DFG HE 2740/19
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Cape et al. (2015)
Data from www.unavco.org
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• Foehn event onset• Increase in temperature of 1 °C/h• Decrease in rel. humidity of 5 %/h• Wind speed > 5 m/s from westerly
direction (>=225° and <= 45°)
• Foehn event • Minimum of 6 hours from onset on with
westerly wind speed >=5 m/s
Cape et al. (2015)
Foehn (black)/no foehn (grey) 2010‐2015 (FSLK2014)
FLSK
FONP
MAM
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AWS: Foehn (black)/no foehn (grey) 2010‐2014/15
FLSK
FONP
MAM JJA SON
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Station Foyn Point (FONP)
Atmospheric modelling: CCLMCOSMO-CLM or CCLM (non-hydrostatic):http://www.clm-community.eu
CCLM nested runs (ERA‐Interim ‐> 15km (C15) ‐> 5km (C05) C15: 2002 – 2016C05: winter 2002 – 2016Hourly data
Case study 5 March 2008
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Anomaly Theta 2mff 10m
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RH2m Precip
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Latent heat flux (–E0)
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Pot. temp and spec. hum.
vert. wind
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wind
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FONP FONP
JJAAWS 2010‐2014/15 grid point C05 2002‐2015
FLSKFLSK
20 events
50 events
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FONP
grid point C05 2002‐2015grid point C15 2002‐2015
FONP
JJA
SCAR SCAR
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SCAR grid point C15 2002‐2015
MAMDJF
JJA SON
7 July 2015
C05 Tsurf
MODIS IR
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Foehn anomalies
T2m
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RH2m ff 10mAnomalies
Summary and outlook
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Foehn events in the AP region AWS 2010‐2015 and C15/05 simulations 2002‐2015
Foehn criteria: changes in wind, temperature and humidityonly foehn events exceeding 6h ‐> change foehn criteria ?(studies of King et al. 2017, Turton et al. 2018)
longest events last more than 2 daysfoehn events cause melting frequently for spring and autumn. In winter, a few cases of melting occur as well.
Implications for during climate change