Precipitation in Norway
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Precipitation in Norway Idar Barstad Idar.Barstad @uni.no Uni Research – ( UniComputing / Bjerknes Centre for Climate Research). Motivation: Orographic precipitation and climate change Results from a small-scaled field campaign. Nesttun, 14th September 2005.

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Precipitation in Norway Idar Barstad

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Precipitation in norway idar barstad

Precipitation in Norway

Idar Barstad

[email protected] Research – (UniComputing / Bjerknes Centre for Climate Research)


Precipitation in norway idar barstad

Motivation:

Orographic precipitation and climate change

Results from a small-scaled field campaign


Nesttun 14th september 2005

Nesttun, 14th September 2005


Precipitation in norway idar barstad

Return period /-amount for Bergen (daily data)

x

Return value (mm/day)

2 months later

1

100

1000

Return period (years)


Precipitation in norway idar barstad

14th Nov 2005

NERSC/NASA


Pressure patterns leading up to extreme precipitation

Pressure patterns leading up to extreme precipitation

Cluster #

-2 days

Extreme day

2

-2 days

Extreme day

3

(Barstad and Sorteberg, 2012, in prep.)


Mean precipitation norway whole year

ARPEGE (HADCM3)

ARPEGE (GFDL)

Mean precipitation Norway – whole year

Sorteberg & Kvamstø, 2008


The study

The study

Increasing demand of products from numerical models of high resolution

Q: Can models deliver what we ask for?


Experimental set up

Experimental set-up

Collect precipitation using rain gauges (“tipping” buckets)

For 12 weeks 2006 across an island at the west coast of Norway

Run numerical model

- WRFV3.3, 9-3-1 km, MYJ, Thompson MP

- spectral nudging (>1000km), 45-15-5 sec time step

Material from a submitted paper (Barstad, 2012 ; QJRMS)


Domain

Domain

9-3-1 km domain

~500 m peaks

10 km

Contours every 50 m


Total precip

Total precip

3 km frontal

3 km convective

Vertically int.

water vapor

rose


Total precip at 1 km grid

Total precip at 1-km grid


Precipitation in norway idar barstad

2

9

18

10

8

1

mod/obs


Precip at high percentiles

Precip at high percentiles

(10min accumulation)

OBS

mod


Time step prec

Time-step prec

OBS

1 km

3 km

(0.2 mm per tip)


Radiosonde info

Radiosonde info


Shallow convection

Shallow convection


Extreme precip cases q99

Extreme precip cases (q99)


Time step prec1

Time-step prec

OBS

1 km

3 km


Wrf and shallow convection

WRF and shallow convection

C Vincent (2010)


Zoom in on the convection

Zoom in on the convection

It doesn’t seem to be as

well defined and organized

as suggested by the model


Precipitation in norway idar barstad

Thank you!

Email: [email protected]


Extreme precipitation w norway

Extreme precipitation – w Norway

A1B scenario – downscaling

using 12 GCM models

Caroletti and Barstad (2009)


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