Gliders for OSMOSISGliders for OSMOSIS
Gillian Damerell, / /18/4/13
What is OSMOSIS?
• Ocean Surface Mixing, g,Ocean Sub‐mesoscale Interaction Study
b l l• Porcupine Abyssal Plain (PAP) site, 48° 41′ N, 16 ° 11′W.16 11 W.
• approx 500km southwest of Ireland
• moorings, Seasoar survey, Seagliders
What is OSMOSIS?
• 1‐year occupation –1 year occupation continuous observations
• gliders in butterfly g ypattern around moorings
• glider turnaround gapprox. every 4 months
Glider butterfly patterns
NW NE NW NE
533 566
C C
SESW SESWSE SESW
Average time 6 days per circuit
Glider turnaround
576 dives
502
510
533656 dives
533
566
579484 dives
655 dives
The gliders PAR sensorg
ECO puck Oxygen
optode
• iRobot SeaglidersCT sail
p
• temperature, salinity, pressure, dive‐averaged currents, dissolved oxygen, chlorophyll fluorescence, CDOM fl i l b kCDOM fluorescence, optical backscatter, photosynthetically available radiation (PAR)
SG566 ‐ Tashtego
SG566 θ‐S
SG533 ‐ Canopus
Issues
• biofouling
• broken temperature sensor• broken temperature sensor
• glider flight
SG533 ‐ Canopus
SG533 ‐ Canopus
Issues• biofouling
• broken temperature sensorbroken temperature sensor
• glider flight Jan to April
Sep to Jan
Ongoing Workg g
• calibration – including optode temperature for Canopus.
49.2
48 8
49
78
9 14151617181920
48.6
48.8
1
234
6
78
12ude
48 2
48.4
10
11
12
21
latitu
48
48.25
21
22
-17 -16 -15 -14 -13 -12 -11 -10 -947.8
longitude
SG533 ‐ Canopus
Ongoing Workg g
• calibration – including optode temperature for Canopus.
• water masses & hydrography.
• cycle in meddies?
SG566 θ‐S
SG566 ‐ Tashtego
Ongoing Workg g
• calibration – including optode temperature for Canopus.
• water masses & hydrography.
• cycle in meddies?
• average properties along sections – and changes over time.
SG566
Line A
Line C
SG566 – line A
SG566 ‐ Tashtego
SG566 – line A
SG566 – line C
Ongoing Workg g
• calibration – including optode temperature for Canopus.
• water masses & hydrography.
• cycle in meddies?
• average properties along sections – and changes over time.
• joint study with Daley Calvert at the Met Office using 1D model to study deepening/shoaling of mixed layer –comparison with observationscomparison with observations.
• seasonal cycle.
Ongoing Workg g• calibration – including optode temperature for Canopus. • water masses & hydrography.y g p y• cycle in meddies?• average properties along sections – and changes over time.
• joint study with Daley Calvert at the Met Office using 1D d l t t d d i / h li f i d lmodel to study deepening/shoaling of mixed layer –
comparison with observations.• seasonal cycleseasonal cycle.• Vertical velocities – internal waves.• links between physics and biogeochemistry with Annalinks between physics and biogeochemistry with Anna Rumyantseva at NOCS.