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Subsidence in the deep Mediterranean. Hans van Haren (on behalf of ANTARES collaboration). Merci: C. Millot, I. Taupier-Letage. down looking. ANTARES neutrino telescope in W-Med.

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merci c millot i taupier letage
Subsidence in the deep Mediterranean
  • Hans van Haren (on behalf of ANTARES collaboration)

Merci: C. Millot, I. Taupier-Letage

NIOZ is part of the Netherlands Organisation for Scientific Research (NWO)

antares neutrino telescope in w med
down lookingANTARES neutrino telescope in W-Med

Acoustic Doppler current profiler (ADCP)level 3 MILOM, at 169 m above bottom50 vertical bins of 2.5 m (between 2310 and 2435 m)

*

Courtesy: C. Curtil

antares adcp overview sep 2005 apr 2007
ANTARES ADCP Overview: sep 2005 - apr 2007

storeys

Current

amplitude

“bad” data

Vertical

current

Relatve Echo

amplitude:

particles

baseline and echo intensity data
Large downward currents (W)!Baseline and Echo intensity data

Current

amplitude

Baseline+

Echo

Amplitude

(Error)

Vertical

current

0.01 m/s ~

1000 m/day

some processes in the w med causing negative vertical currents
Some processes in the W-Med causing negative vertical currents

- deep-water formation (dw)

- meso-scale eddies (ME)

- meso-scale currents (NC)

*

A

P

ME

A Alps P Pyrenees

slide6
Evidence of DW: negative currents in winter only

Courtesy: X. Durrieu de Madron and collaborators

Gulf of Lions

rapid downward motions and eddies algerian basin no dw
39°N

39°N

38°N

38°N

37°N

37°N

7°E

7°E

8°E

8°E

9°E

9°E

Rapid downward motions and eddies: Algerian Basin (no DW)

300

600

+10-

-20 mm/s

(5- -10 dB)

1900-

2400 m

ANTARES:

bioluminescent “particles”

van Haren, H., C. Millot, and I. Taupier-Letage, GRL 2006.

slide9
Chl-a Fluorescence (µg l-1)

More effects of DW: deep stratification

TN ~ 5-8 h

Near-bottom intrusion of dense shelf water forms well defined thermo-haline, turbidity, and fluorescence bottom anomalies

“New” water stratification; TN ~ 1 hour

Courtesy: X. D. de Madron ea

some peculiar antares observations 2008
Some peculiar Antares observations 2008

First half year, similar to spring 2006

Current

Magnitude

10-3 m s-1

2.5 m bins

Relative Echo

Amplitude

dB

Vertical

Current

10-3 m s-1

some peculiar antares observations 20081
Some peculiar Antares observations 2008

First 3 weeks 2009

Current

Magnitude

10-3 m s-1

Relative Echo

Amplitude

dB

Vertical

Current

10-3 m s-1

Low and High frequency internal waves

some peculiar antares observations 20082
Some peculiar Antares observations 2008

Last 5 days 2008

Current

Magnitude

10-3 m s-1

Relative Echo

Amplitude

dB

Vertical

Current

10-3 m s-1

High frequency internal waves (~1 hour)

 “strong” stratification

conclusions
Conclusions
  • Spring 2006 large amounts particles in deep:
  • (bioluminescent) optics confirmed acoustically
  • Regular strong vertical downward currents (1000 m/day)
  • Associated with meso-scale motions
  • No direct evidence for local DW
  • Deep stratification, following DW?,
    • certainly high-frequency wave motions!

The end

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