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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 Antarktisforschung Grant: DFG HE 2740/19 2 Cape et al. (2015) Data from www.unavco.org

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Page 1: A model‐based study of foehneffect impacts on the near ...amrc.ssec.wisc.edu › meetings › meeting2018 › presentations › Day2 … · Case study5 March 2008 7 AnomalyTheta

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 

2

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

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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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Page 6: A model‐based study of foehneffect impacts on the near ...amrc.ssec.wisc.edu › meetings › meeting2018 › presentations › Day2 … · Case study5 March 2008 7 AnomalyTheta

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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

Page 10: A model‐based study of foehneffect impacts on the near ...amrc.ssec.wisc.edu › meetings › meeting2018 › presentations › Day2 … · Case study5 March 2008 7 AnomalyTheta

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