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13th EMS & 11th ECAM Model and scatterometer sea surface winds for storm surge applications in the Adriatic Sea Francesco De Biasio*, Stefano Zecchetto,

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Presentation on theme: "13th EMS & 11th ECAM Model and scatterometer sea surface winds for storm surge applications in the Adriatic Sea Francesco De Biasio*, Stefano Zecchetto,"— Presentation transcript:

1 13th EMS & 11th ECAM Model and scatterometer sea surface winds for storm surge applications in the Adriatic Sea Francesco De Biasio*, Stefano Zecchetto, Mario Marcello Miglietta Istituto di Scienze dell'Atmosfera e del Clima (ISAC) Consiglio Nazionale delle Ricerche (CNR) Corso Stati Uniti 4, 35127 Padova, Italy * email: f.debiasio@isac.cnr.it

2 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK2 Motivations for the study Some operational NWP models available in the Adriatic Sea EO surface wind data available in the Adriatic Sea Do NWP models and EO wind data look similar? A case study Local statistics Global statistics Presentation outline

3 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK3 This study was performed in the framework of the eSurge-Venice project, a project funded by the European Space Agency (ESA). It aims to: Compare the performances of the Atmospheric Global Circulation Models (GCM) and Limited Area Models (LAM) wind fields to be used as forcing into the storm surge models in the Adriatic Sea. 1 -Motivations Satellite-borne scatterometers surface winds are exploited as the reference fields to be used in the assessment of the quality of GCM and LAM wind forecasts in the Adriatic Sea NWP limits: initial conditions, parameterization schemes, … EO limits: data availability, revisitation time, distance to coast. Period: August 2008 – July 2011 http://www.esurge-venice.eu

4 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK4 GLOBAL MODELS: IFS – operational at ECMWF From 01/02/2006 to 26/01/2010:TL799 (25 km), from 26/01/2010 to present:TL1279 (16 km) Grid spacing used (after interpolation):12,0 km LOCAL AREA MODELS (THE FIRST TWO PROVIDED TO “MUNICIPAL STORM SURGE FORECASTING OFFICE IN VENICE”: ALADIN – operational at DHZ (Croatian Meteorological and Hydrological Service) initialized with ARPEGE (Meteo-France), two nested grids (only the first, larger domain is used here) Grid spacing: 8 km COSMO-LAMI – operational at ARPA Emilia-Romagna initialized with ECMWF, one grid Grid spacing: 7 km WRF – Weather Research and Forecasting Model initialized with ECMWF, one grid Grid spacing: 10 km 2 - Atmospheric numerical weather prediction models available in the Adriatic Sea (surface wind)

5 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK ALADIN DOMAIN COSMO-LAMI DOMAIN 1500 x 2000 km

6 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK6 3.1 - EO surface wind fields available in the Adriatic Sea SENSOR:SeaWinds on QuikSCATASCAT on MetOp TYPE:Ku-band scatterometerC-band scatterometer AVAILABILITY:August 2008-November 2009March 2009-July 2011 GRID SPACING:12.5km OWV12.5km OWV SWATH:One swath 1800 km wideTwo swaths 550 km wide AVERAGE HITS:~30/mo in the Adriatic Sea~20/mo in the Adriatic Sea Mean number of hits/month Actually 3 additional sensors are available in the area

7 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK7 3.2 – Main wind regimes in the Adriatic Sea Bora: a violent, cold, northeasterly winter wind on the Adriatic Sea Sirocco: a warm, moist, southeast wind blowing on the northern Mediterranean coast BOTH WINDS CAN CAUSE SEVERE STORM SURGE IN THE NORTHERN ADRIATIC SEA AND IN THE VENICE LAGOON Mediterranean Sea Adriatic Sea

8 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK 4.0 –Wind fields in the Adriatic Sea: Bora event November 17, 2008

9 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK9 4.1 –Wind fields in the Adriatic Sea: Bora event November 17, 2008 November 17, 2008 QUIKECMWFALADINLAMIWRF 18:0818:0018:0018:0018:00

10 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK10 4.2 –Wind fields in the Adriatic Sea: Bora event November 17, 2008 November 18, 2008 QUIKECMWFALADINLAMIWRF 03:5003:0003:0003:0003:00

11 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK11 4.3 –Wind fields in the Adriatic Sea: Bora event November 17, 2008

12 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK12 5.1 – SCAT/MODEL local statistics: wind speed bias wind speed bias The forecast range +12-+36 h is used for sake of comparison

13 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK13 5.2 – SCAT/MODEL local statistics: wind direction difference mean of wind direction difference

14 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK14 5.3 – SCAT/MODEL local statistics: wind speed correlation wind speed correlation corrcoef(WS SCAT,WS ECMWF )corrcoef(WS SCAT,WS ALADIN ) corrcoef(WS SCAT,WS LAMI )

15 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK15 5.4 – SCAT/MODEL local statistics: wind direction correlation wind direction correlation corrcoef(WD SCAT,WD ECMWF )corrcoef(WD SCAT,WD ALADIN ) corrcoef(WD SCAT,WD LAMI )

16 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK16 5.5 – SCAT/MODEL local statistics: wind speed centered RMSD wind speed centered Root Mean Square Difference cRMSD(WS SCAT,WS ECMWF )cRMSD(WS SCAT,WS ALADIN )cRMSD(WS SCAT,WS LAMI )

17 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK17 5.6 – SCAT/MODEL local statistics: wind direction difference std standard dev. of wind direction difference std_dev(WD SCAT -WD ECMWF )std_dev(WD SCAT -WD ALADIN )std_dev(WD SCAT -WD LAMI )

18 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK18 6.1 – SCAT/MODEL global statistics. Wind speed and direction distributions.

19 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK19 6.2 – SCAT/MODEL global statistics. TAYLOR diag. of wind speed

20 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK20 7 – Conclusions LAMs apparently perform similarly as ECMWF in the simulation of winds over the Adriatic sea The performance is better in open sea and worse near the coastlines ALADIN performs better in terms of correlation and standard deviation, LAMI has a lower bias (LAMI has a smaller domain extension which may affect the results) The errors in speed/direction are due to misplacing of wind patterns and inaccurate time evolution

21 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK EFFECTIVE RESOLUTION OF A LAM -> NEED OF HIGHER RESOLUTION

22 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK INTERPRETATION OF GLOBAL STATISTICS

23 13th EMS & 11th ECAM 9 - 13 September 2013 | Reading | UK23 Bla bla bla… Thank you for your attention

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