merci: c. millot, i. taupier-letage
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/1.jpg)
1NIOZ is part of the Netherlands Organisation for Scientific Research (NWO)
Koninklijk Nederlands Instituut voor ZeeonderzoekRoyal Netherlands Institute for Sea Research
Merci: C. Millot, I. Taupier-Letage
Hans van Haren (on behalf of ANTARES collaboration)
Subsidence in the deep Mediterranean
![Page 2: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/2.jpg)
2
Acoustic Doppler current profiler (ADCP)level 3 MILOM, at 169 m above bottom50 vertical bins of 2.5 m (between 2310 and 2435 m)
ANTARES neutrino telescope in W-Med
Courtesy: C. Curtil
down looking
*
![Page 3: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/3.jpg)
3
ANTARES ADCP Overview: sep 2005 - apr 2007
Current amplitude
Verticalcurrent
Relatve Echo amplitude:particles
“bad” data
storeys
![Page 4: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/4.jpg)
4
Baseline and Echo intensity data
Current amplitude
(Error)Verticalcurrent
Baseline+Echo
Amplitude
0.01 m/s ~1000 m/day
Large downward currents (W)!
![Page 5: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/5.jpg)
5
Some processes in the W-Med causing negative vertical currents
- deep-water formation (dw)- meso-scale eddies (ME)
- meso-scale currents (NC)
ME
PA
A Alps P Pyrenees
*
![Page 6: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/6.jpg)
6
Courtesy: X. Durrieu de Madron and collaborators
Gulf of Lions
Evidence of DW: negative currents in winter only
![Page 7: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/7.jpg)
7
Other mechanisms following DW: meso-scale
eddies?
*
Chl-a day 69
susp sed day 88
![Page 8: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/8.jpg)
8
Rapid downward motions and eddies: Algerian Basin (no
DW)
39°N
37°N
39°N
37°N
38°N
38°N
7°E 8°E 9°E 7°E 8°E 9°E
van Haren, H., C. Millot, and I. Taupier-Letage, GRL 2006.
ANTARES: bioluminescent “particles”
+10--20 mm/s(5- -10 dB)
1900-2400 m
600300
![Page 9: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/9.jpg)
9
Near-bottom intrusion of dense shelf water forms well defined thermo-haline, turbidity, and fluorescence bottom anomalies
Chl-a Fluorescence (µg l-1)
“New” water stratification; TN ~ 1 hour
Courtesy: X. D. de Madron ea
TN ~ 5-8 h
More effects of DW: deep stratification
![Page 10: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/10.jpg)
10
Some peculiar Antares observations 2008
CurrentMagnitude10-3 m s-1
VerticalCurrent
10-3 m s-1
Relative Echo Amplitude
dB
First half year, similar to spring 2006
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
![Page 11: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/11.jpg)
11
Some peculiar Antares observations 2008
High frequency internal waves
CurrentMagnitude10-3 m s-1
VerticalCurrent10-3 m s-1
Relative Echo Amplitude
dB
First 3 weeks 2009
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
![Page 12: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/12.jpg)
12
Some peculiar Antares observations 2008
High frequency internal waves (~1 hour) “strong” stratification
CurrentMagnitude10-3 m s-1
VerticalCurrent10-3 m s-1
Relative Echo Amplitude
dB
Last 5 days 2008
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
2250
2300
2350
-Z (
m)
![Page 13: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/13.jpg)
13
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
![Page 14: Merci: C. Millot, I. Taupier-Letage](https://reader036.vdocuments.mx/reader036/viewer/2022062422/56813c23550346895da59bae/html5/thumbnails/14.jpg)
14
Some peculiar Antares observations 2008