development of the glider system in-situ observations mersea 3rd annual meeting london, 06.03.2006...
Post on 26-Dec-2015
213 Views
Preview:
TRANSCRIPT
Development of the glider system
In-Situ Observations
MERSEA 3rd annual meetingLondon, 06.03.2006
IFM-GEOMAR, Kiel, GermanyIMEDEA, Esporles, Spain
IFREMER, LPO, Coriolis, CERSAT, Brest, France,LOCEAN, Paris, France,
MERCATOR, Toulouse, FranceSIO, LaJolla, CA, USA
1) Gliders are driven by positive and negative buoyancy created by a change in volume. No propeller is required.
2) Wings convert vertical velocity into forward velocity.
3) Glide downward when denser than surrounding water and upward when buoyant, in a sawtooth pattern.
SprayScripps Institution of Oceanography
SeagliderAPL-University of
Washington
Slocum Webb Research
Corp.
Autonomous Underwater Gliding Vehicle (AUGVs): GLIDERS
change of buoyancy and control ofinternal mass distribution
forward movements
induced vertical velocity,and control of roll and pitch
Coriolis Data CenterIFREMERBrest, France
Numerical ModelsMercator, MFS, ...
Ground StationIFM-GEOMAR
Kiel, Germany
U ~ 20-40 cm/sW ~ 10-20cm/s
Autonomous Underwater Gliding Vehicle (AUGVs): GLIDERS
1km
~2-5 km between surfacings
North Atlantic Ocean
Mediterranean Sea
Development of the glider system:
Collection of Physical and Biogeochemical Data during the TOP phase
Data Flow and Quality Control
Data Assimilation
Next operations
Spray gliderScripps Institution of Oceanography
Slocum glider Webb Research Corporation
MERSEA gliders
WP3.5: assessment of available long-range glider technologies which meet MERSEA requirements
Mediterranean Sea
Operations with 2 Slocums
1) Development of user-fitted lithium batteriesfor better endurance (x3)Tests during a “virtual mooring“ mission.
~120 profiles (0-1000m, end of Sept. 2005)
2) Trials in coastal environment (0-200m)
Poster WP3.5
Virtual mooring off Mallorca
21.09.2005 02.10.2005To be continued...
Potential temperature
North Atlantic Ocean – TOP phase
Glider survey around PAP (MERSEA multidisciplinary mooring)
Press releases for MERSEAOuest-France Telegramme
Proven ~3-months endurance (> 2300 km horiz.)
Carried out ~450 dives to 1000mmeasurements of
- Salinity,- Temperature,- Fluorescence (Chl), - Currents averaged
over 0-1000m (green arrows).
Preparation at Ifremer (Brest)
Deployment from the Argonaute (SHOM) on the 05.12.2005 - still active!
+
All profiles in grey. Last profiles in color. [n=last profile]
North Atlantic Ocean
5 Dec. 2005 - now~450 profiles to 1000m
[5 profiles/day]
Vertical res. ~ 3 mHoriz res. ~ 3-5 km
n, n-1, n-2, n-3, n-4, n-5, n-6
Salinity Pot. temperature Chl Pot. Density
North Atlantic Ocean
Large scale: water mass characteristics and distribution, mixed layer evolutionMesoscale (~50 km): fronts, eddiesSmall scale (~3-5km): oscillations, filaments – “subgrid phenomena“
Physical constraints on numerical models
Potential temperature along the glider trajectory
~ 2300 km - 3 months
Mixed layer depth
North Atlantic Ocean
Large scale: water mass characteristics and distribution, mixed layer evolutionMesoscale (~50 km): fronts, eddiesSmall scale (~3-5km): oscillations, filaments – “subgrid phenomena“
Physical constraints on numerical models
+PAP
80 km
Potential temperature along the glider trajectory
U ~ 30cm/s
North Atlantic Ocean
Large scale: water mass characteristics and distribution, mixed layer evolutionMesoscale (~50 km): fronts, eddiesSmall scale (~3-5km): oscillations, filaments – “subgrid phenomena“
Physical constraints on numerical models
+
Potential temperature along the glider trajectory
PAP
North Atlantic Ocean
Large scale: water mass characteristics and distribution, mixed layer evolutionMesoscale (~50 km): fronts, eddiesSmall scale (~3-5km): oscillations, filaments – “subgrid phenomena“
Physical constraints on numerical models
Salinity along the glider trajectory
Large scale: biological acitivity (mainly mixed layer), vertical distribution/integralMesoscale (~50 km): local modulations Small scale (~3-5km): diurnal cycle, filaments
North Atlantic Ocean
Fluorescence (Chl) along the glider trajectory
Vertical integral = bio-activity in the mixed layer
validation elements for coupled physical-biogeochemical models
Glider Control from Land
Monitoring the health of the glider (Voltage, pump time, waypoints, comms...)
Remote steeringwith information from:
1) model analyses/forecasts 2) satellite imagery
“Glider Routing“ in development:use of a glider simulator in NRT to forecast glider trajectories
<< better steering >>
MERCATOR - SSH
AVHRR - SST
Coriolis ftp server
Data Access
http://www.ifm.uni-kiel.de/fb/fb1/po2/research/mersea/gliders/spray004_position.html
http://www.coriolis.eu.org/cdc/dataSelection/cdcDataSelections.asp
Mersea In-Situ Portaldata visualization
Coriolis data selection websitedata visualization and download
Quality Control and Metadata
QC procedures at Coriolis like for profiling floats. Profiles are considered as vertical.
- T and S outsiders based on historical data- Density inversions
are rejected
+ visual inspection
Metadata:Vehicle name, project, PIWaypoint (heading)Angle of ascent/descentTarget depthClimb depthTarget altitudeTime between surfacingCurrent correction
Dive #260 – “dirt“ in the conductivity cell
Assimilation of glider data
Temperature differences between MERCATOR North Atlantic 1/15°
and the in-situ observations
Before data assimilation
After data assimilation
glider
The model trajectory is modified by the data assimilation process,
to better fit the observations.
development required to better assimilate in-situ data
at the moment: correlation criteria for profiling floats
1 profile per 1°x1° per week>> in progress
Achievements and Plans
Demonstrated1) Steering possibility2) Long endurance3) Near real time physical and biogeochemical data 4) High density and resolution of the measurements5) Continuous measurements 6) Impact on operational numerical products
Next operations- Deployments in the Western Mediterranean
end of March
- Deployments in the North Atlantic1) Maintain surveys around PAP
recovery/redeployment
2) Similar survey around CIS June-Sept 2006
top related