Small Scale phenomena in Mediterranean and Adriatic seas: Meteorological Tsunamis

EV2 Lafon AmauryEV2 Macheboeuf Loïc

Contents

1. Meteorological tsunamis2. Materials and Methods

2.1 Sea level to sea height2.2 Detetecting event3.3 Summary

3. Analysis3.1 Sea level analysis3.2 Sea height analysis

4. General events5. General synoptics

5.1 Spain5.2 Sicily

6. Specific eventsConclusion

What are the atmospheric processes hold responsible for meteorological tsunamis in the western part of the Mediterranean Sea?

Meteotsunamis

An atmospheric disturbance with quick

pressure jumps

a harbor, a bay or an inlet with

the high Q-factor

A set of two resonances

(external and internal

resonances)

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

• Pre-processing (overlapping and missing data, unrealistic peaks, de-tided, linearly interpolated and 4-hour period Keiser-Bessel window filtered)

• Sea height

• Area of study: Mediterranean Seas.• 4 areas established upon geographical

considerations

A B

C

D

1. Meteorological tsunamis2. Materials and Methods

2.1 Sea level to sea height2.2 Detetecting event3.3 Summary

3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

Criteria of selection:• Maximum height of event• Duration of event• At least 3 station have to record the event

1. Meteorological tsunamis2. Materials and Methods

2.1 Sea level to sea height2.2 Detetecting event3.3 Summary

3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

84 tide gauge

stations

• Sea level downloaded from IOC sea level monitoring website.

72 tide gauge

stations used

• Multimodal correlation

36 possib

le events chose

n

• multisite aggregation

33 events analyze

d

• Synoptic condition downloaded from ECMWF ERA-interim website

• MSLP, 850hPa temperature, 500hPa wind and Richard number

1. Meteorological tsunamis2. Materials and Methods

2.1 Sea level to sea height2.2 Detetecting event3.3 Summary

3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

• Most of event in the Mediterranean Sea occurred during summer time.

• One phenomenon is to be observed: Extreme peaks moves downtime as we go eastward.

1 2 3 4 5 6 7 8 9 10 11 120

2

4

6

8

10

12

area Aarea Barea Carea Dall stations

month

N°

1. Meteorological tsunamis2. Materials and Methods3. Analysis

3.1 Sea level analysis3.2 Sea height analysis

4. General events5. General synoptics6. Specific eventsConclusion

N° of event Name of stations date Height recorded Station recording the maximum height Maximum height

4

Catania

27/03/2014

0,1492

Ortona 0,2347

Messina 0,1513

Crotone 0,0567

Otranto 0,2297

Bari 0,1487

Vieste 0,1387

Ortona 0,2347

Taranto 0,1023

5

Porto empedocle

11/04/2012

0,3548

Porto empedocle 0,3548 Lampedusa 0,3364

Palermo 0,1361

Napoli 0,2713

Centuri 2 0,0157

13

Solenzra2

20/11/2013

0,2126

Ginostra (Isola di Stromboli) 0,6765

Ajaccio 2 0,0968

Centuri 2 0,484

nice 0,1121

Ginostra (Isola di Stromboli) 0,6765

Palermo 0,2083

Lampedusa 0,1156

Porto empedocle 0,2948

17

Solenzra2

04/07/2014

0,307

Anzio 0,3638

Ajaccio 2 0,1152

Ile rousse 2 0,2068

Centuri 2 0,3021

Genova 0,1312

La Spezia 0,2162

Livorno 0,0127

Anzio 0,3638

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

2 high-risk regions highlighted

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics

5.1 Spain5.2 Sicily

6. Specific eventsConclusion

Mean Synoptic Conditions

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics

5.1 Spain5.2 Sicily

6. Specific eventsConclusion

Mean Anomalies

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics

5.1 Spain5.2 Sicily

6. Specific eventsConclusion

Mean Synoptic Conditions

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics

5.1 Spain5.2 Sicily

6. Specific eventsConclusion

Mean Anomalies

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General synoptics6. Specific eventsConclusion

1. Meteorological tsunamis2. Materials and Methods3. Analysis4. General events5. General

synoptics6. Specific eventsConclusion

• Extreme peaks move downtime as we move to the East.• Some differences between areas: change of MSLP,

depending of seasons.• Same atmospheric processes that can lead to

meteorological tsunamis govern all the strongest events and most of other high-frequency sea level oscillations in the western part of the Mediterranean Sea: Atmospheric Gravity Waves