oceanographic conditions during the densest water...

Oceanographic conditions during the densest water formation in 2012

10/02/2012: satellite image Envisat ‐ ESA

Northern Adriatic Response to a Wintertime Bora Wind Event. C.M. Lee et al., 2005. Eos, Vol. 86, No. 16, 19 April 2005

Vlado Malačič, Branko CermeljMBSS-NIB (SLO)Massimo Celio, Dario Giaiotti ARPA-FVG (IT)Cinzia Comici OGS-BIO (IT)Fabio Raicich & Carolina CantoniISMAR (IT)

4/20/2012 1Effetti della bora, Trieste

SAR pictures – ISAC from: Envisat – ESA10-11 February 2012


SAR pictures – ISAC from: Envisat – ESA13-14 February 2012


Section. 1

Section 2

Distribution of CTD stations of: ARPA-FVG, OGS-BIO and MBS-NIBbetween 14-16 Feb. 2012


Section 1

4/20/2012 Effetti della bora, Trieste 5

Section 2


Horizontal distribution of T, S, σθ at 12 m

14-16 February 2012


Time series of measurements registered by buoy Vida


Section 1

A month later…. Distribution of stations

14-15 March 2012


Section 1


Horizontal distribution of T, S, σθ at 12 m14-15 March 2012


Density at the sea-floor

Branko Čermelj

14-16 Feb. 2012

14-15 March 2012

4/20/2012 Effetti della bora, Trieste

A. Vatova, March 1929: In front of the Bay of Koper at h = 22 m: σθ = 30.33 kg/m3

T = 3.95 0C, S = 38.15

NAW: σθ = 29.52 kg/m3

12

Istituto di Scienze Marine – U.O.S Trieste C. N. R.Istituto di Scienze Marine – U.O.S Trieste C. N. R.

Fabio Raicich & Carolina Cantoni

13.4 13.5 13.6 13.7 13.8long. E

45.5

45.6

45.7

45.8

lat.

N

Trieste

Monfalcone

KoperPiran

Rizana River

Isonzo

River

Timavo River

ISMAR – TS Marine stations

PALOMABAN

Time series of measurements registered by Paloma & MFB

Molo Fratelli Bandiera Station


Air TemperatureWind Speed and directionSW Temperature at:0.4 – 2 – 6 m = Bottom

PALOMA dynamic pylon (meda elastica)

OSMER meteorological st.Wind speed and directionSolar radiation, precipitations, Air T

ISMAR marine st.Air temperature, SW Temperature at: 2 – 15 – 24 m Bottom 25 m

T 2.0 m

Meteorological station

T 24.0 m

T 15.0 mMolo Fratelli Bandiera St.

PALOMA St.

Istituto di Scienze Marine – U.O.S Trieste C. N. R.Istituto di Scienze Marine – U.O.S Trieste C. N. R.

Fabio Raicich & Carolina Cantoni

27

26/1 31/1 5/2 10/2 15/2 20/2 25/2

SW TMolo F.lli

Bandiera st.

SW TPALOMA st.

Wind speed Molo F.lli

Bandiera st. (BAN)

ISMAR main Building (IST)

Average T decrease of5.8°C at BAN and of 5.6°C at PALOMA

Wind speed decrease

5.8°C5.8°C

5.6°C5.6°C

On 12/2/2012Temperatures lower than 4.5 °C were measured on the whole water column at PALOMA st.

thermal stratification at PALOMA st.T bottom < T surfAverage difference 1.4 °C


Fabio Raicich

Carolina Cantoni

10/2 12/2 14/2 16/2 18/2 20/2 22/2 24/2

Time since 10th Feb. 2012

Period (days)

Spectra of temperature

15Effetti della bora, Trieste4/20/2012

Paloma: Peculiar T at 15 m:

Inertial osc. ≈ 17 h

Heat budgetAir Temperature Wind speed Dew point temperature

°C m/s °C-4 15 -13

Sea Temperature°C5

Sensible heat flux. Daily flux of heat out of

the sea due to conduction from 1m2 of

sea surface

Daily kilograms of water evaporated from

1m2 of sea surface.

Latent heat flux. Daily flux of heat carried by

evaporation from 1m2 of sea suface

KJ Kg KJ21928 4.8 12071

Total heat flux. Daily flux of heat out of

the sea from 1m2 of sea surface

KJ33999

M. Celio4/20/2012 16Effetti della bora, Trieste

What we need?A lot of good will…

First phase (until the end of June-July 2012)Satellite images (data!)

SST – to see (confirm) the ‘topography control ‘ during the bora wind (topo control of T and v)

Radarsat/Seascat of the wind fieldWho will pay? Any institution that supports getting images for

research? We will acknowledge them…

Second phase (from the end of June-July to December 2012)Numerical modeling to capture the dynamics

Atmospheric models:ARPA (WRF ∆x = 2 km) ARSO (Aladin/SI ∆x = 4 km with data assimilation)

Coastal water modelsOGS non-hydrostatic model of the formation of the dense

bottom water via gravity (slope) currentsNIB-ARSO: wind-driven circulation during the strong bora

So far there has been a lot of good will and trust…Thanks!4/20/2012 17Effetti della bora, Trieste

oceanographic conditions during the densest water...

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