Precipitation in Norway
Sponsored Links
This presentation is the property of its rightful owner.
1 / 23

Precipitation in Norway Idar Barstad PowerPoint PPT Presentation


  • 61 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Precipitation in Norway Idar Barstad

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Precipitation in Norway

Idar Barstad

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


Motivation:

Orographic precipitation and climate change

Results from a small-scaled field campaign


Nesttun, 14th September 2005


Return period /-amount for Bergen (daily data)

x

Return value (mm/day)

2 months later

1

100

1000

Return period (years)


14th Nov 2005

NERSC/NASA


Pressure patterns leading up to extreme precipitation

Cluster #

-2 days

Extreme day

2

-2 days

Extreme day

3

(Barstad and Sorteberg, 2012, in prep.)


ARPEGE (HADCM3)

ARPEGE (GFDL)

Mean precipitation Norway – whole year

Sorteberg & Kvamstø, 2008


The study

Increasing demand of products from numerical models of high resolution

Q: Can models deliver what we ask for?


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

9-3-1 km domain

~500 m peaks

10 km

Contours every 50 m


Total precip

3 km frontal

3 km convective

Vertically int.

water vapor

rose


Total precip at 1-km grid


2

9

18

10

8

1

mod/obs


Precip at high percentiles

(10min accumulation)

OBS

mod


Time-step prec

OBS

1 km

3 km

(0.2 mm per tip)


Radiosonde info


Shallow convection


Extreme precip cases (q99)


Time-step prec

OBS

1 km

3 km


WRF and shallow convection

C Vincent (2010)


Zoom in on the convection

It doesn’t seem to be as

well defined and organized

as suggested by the model


Thank you!

Email: [email protected]


Extreme precipitation – w Norway

A1B scenario – downscaling

using 12 GCM models

Caroletti and Barstad (2009)


  • Login