# Presentation: 358189

## Moorings & altimetry
Argo floats launched with parking depths at 400 db and 1000 db to document point 2

- Contribution to monitoring the cold water route is constructed along 3 axes:
- 1- monitoring transport of the Malvinas Current
- 2- documenting water mass transformation in the Argentine Basin (& DP)
- 3- monitoring transport through Drake Passage

- Moorings & altimetry
- Argo floats launched with parking depths at 400 db and 1000 db to document point 2

## Malvinas Current

- Current meters moorings in the Malvinas Current below
- Jason ground track 026.
-  Isobaths [500 1000 1500 2000 3000 4000 5000],
- positions of SAF and BCF as in Saraceno et al 2004
- Blue dots moorings in 1993-1995
- Red dots : moorings in 2001-2003

- 15-year-long MC transport time series computed from  altimetric data and statistical information brought by the two current meters data sets *(in black)*, and from current meter measurements [2001-2003 data set *(in red)*; 1993-1995 data set *((in blue)*]. Correlation 0.8)
- Change in regime : annual cycle after 2000

## Regression of the windstress curl on the transport time series at 41°S 

**Regression of the windstress curl on the transport time series at 41°S **
- confidence intervals ----- 15% ___   5%
- on the 13-year-long time series [1992:2005]
- on the first part of the time series
- [1992:2000]
- on the second part of the time series [2001:2005]

## Regression of the windstress curl on the transport time series at 41°S 

**Regression of the windstress curl on the transport time series at 41°S **
- confidence intervals ----- 15% ___   5%
- on the 13-year-long time series [1992:2005]
- on the first part of the time series
- [1992:2000]
- on the second part of the time series [2001:2005]

## Circulation around Zapiola Rise

- f/h contours  over bathymetry
-  Velocities from ARGO floats ( pf3900111 et pf3900110)
-  order of 20 cm/s at  2000 db
-  anticyclonic circulation around ZR
- Transport estimate (Saunders and King )
-   flow over 100 Sv
- ZA acts as a blender
- Martin Saraceno

## Transport

-  transport time series (Low pass filtered)
- possible collapses of the anticyclone  -  impact on mixing.

## Moorings presently in the water

- 10 moorings in the water since Feb 2006:  M1 to M10.
- Location : below Jason track # 104: 9 Jason cross over points + 1 extra in Yaghan Basin for a better resolution of the stronger flow.
- M10 (CM + sediment traps) recovered and redeployed in Dec 2006.
- M1 to M10 to be recovered in April 2008  (coll. Korea , KORDI Jae Hak Lee)

## Mooring operations 2006-2010coll. LOCEAN/ KORDI/ AWI

- 2006-2008
- 10 moorings in the water since Feb 2006
- M10 (CM + sediment traps) recovered and redeployed in Dec 2006.
- M1 to M10 to be recovered in April 2008
- during Zero-Drake IPY Cruise - E. Farhbach
- 2008-2009
- 5 to 6 moorings to be redeployed in the Yaghan Basin in April 2008:
- Low frequency mode in SSH in Yaghan Basin
- M1 to M5 funded (coll. LOCEAN& Kordi)
- ? an extra mooring between M3 and M4 ?
- Recovery in September 2009
- All operations from R.V. Polarstern

## 12 floats launched from R.V. Puerto Deseado

**March 16, 2005:** 6 floats launched in Drake Passage
- 	3 with 400 db parking depth
- 	3 with 1000 db parking depth

**July 2 2005:** 6 floats launched off the coast of Argentina
- 3 with 400 db parking depth
- 3 with 1000 db parking depth

- 							Pseudo-trajectories
**April 2007:** 	2 floats died ( in the same area 36-30W and 38-42S after a life of 11 and 20 months)
- 			5 floats left the Argentine Basin (eastward towards South Africa)
- 			5 floats still in the Argentine Basin (eastern part) and functionning
- 12 floats to be deployed again in Drake Passage: from Polarstern in April 2008.

- dead

## Profiles and seasons.

- Positions of the profiles-  Color represents seasons.
- First winter (blue dots) over the Malvinas plateau and Patagonian slope.
- Second winter (blue cross) more to the East

- No float above
- Zapiola Rise

## Temperature and salinity as a function n : float 394

- Temperature and salinity as a function n : float 394

- 1st winter :
- ventilation over Malvinad Plateau: cooling and freshening until n = 27.6.

- Water (= 27.33) in contact with atmosphere (ventilation)

- 2nd winter:
- ventilation until 27.10 only. Float no more in the argentine basin. Left  since cycle 48.

- T

- S

- Low frequency variability
- Models with data assimilation Mercator, ECCO ..
- On-going or funded  - proposed? Or to be proposed?
- Moorings across WBB and SRP (Choke points)