Workshop = Work in Progress

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Workshop Work in Progress
No title

• If only I could get organized
• Data Overload
• Loving it

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July/August 2003 ADCP Survey Volume Flux Summary
0.7?0.07 Sv
1 Sv106 m3/s or 5 Amazon R. or 200 Columbia R.
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USCGC Healy ADCP Systems
well of the 75-kHz phased array?
Healy in snowy Seattle dry-dock
a bilge rat in the back?
system command and control
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Data Processing Challenge Ice
Ellesmere Island, Aug.-4, 3am Start first ADCP
survey
Greenland, Aug.-4, 6am Finish first ADCP survey
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ADCP Processing Sorting and Screening Single
Ping Data
water track relative to ship (true North,
unsorted)
water track relative to bottom (true North,
sorted)
water track relative to bottom (true East, sorted)
water track relative to ship (true East, unsorted)
1 hour
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ADCP Calibration-1 Comparing ADCP to GPS-derived
Ships Velocity Components
Looks good but cant really tell
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ADCP Calibration-2 ADCP-DGPS Velocity Vector
Difference ( 2-min avg.)
North
East
Histogram
Integrated Histogram
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Robeson Channel ADCP Velocity Aug.-7-11, 2003
Measured
108-m
Ellesmere Island
Detided Measured-Tides
108-m
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Two tidal removal techniques applied to Kennedy
Channel
across- channel
along- channel

• 3-D detiding
• 2 constituents
• Münchow (2000)
• Local fit to data

• 2-D detiding
• 8 constituents
• Padman Erofeeva (2004)
• Global model data assimilation

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July/August 2003 ADCP Survey Volume Flux Summary
0.7?0.07 Sv
1 Sv106 m3/s or 5 Amazon R. or 200 Columbia R.
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Winds Aug. 2003
Along 2003 ship track in Nares Strait
Winds during our survey and mooring work in Nares
Strait were generally from the south and opposed
the generally southward flow.
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108-m
108-m
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108-m
108-m
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(c)
(a)
108-m
(b)
108-m
(d)
108-m
108-m
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(a)
(b)
Robeson Channel
Kennedy Channel, N
(c)
(d)
Smith Sound
Kennedy Channel, S
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July/August 2003 ADCP Survey Volume Flux Summary
0.7?0.07 Sv
1 Sv106 m3/s or 5 Amazon R. or 200 Columbia R.
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Along-shore ADCP currents July-27 through
July-30, 2003
108-m
Is this the Baffin Island Current?
303-m
Volume flux -2.7 Sv
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7/26, 0300 to 7/29, 0000
7/29, 0000 to 7/30 0900
108-m
108-m
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7/26, 0300 to 7/29, 0000
108-m
Volume flux -4.8 Sv
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Along-shore ADCP currents July-30 through
July-31, 2003
Is this the West Greenland Current?
Volume flux 4.3 Sv
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(No Transcript)
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First Mooring Result 2006
Ellesmere Island, Aug.-16, 2006 CT/CTD string
recovery
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5-week under-ice current measurements 1972
Distance (km)
Sadler (1976)Water, heat, and salt transports
through Nares Strait, Ellesmere Island
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?
?
?
ADCP
X
X
CT/CTD
All recovered instruments have clean 3-year
records
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Low-pass-filtered depth-averaged Currents August
2003 through August 2006
km-34, Greenland
km-30
km-24
km-03, Canada
3 years
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3-year record mean
2-day snapshot
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Three-year along-channel currents from 2 ADCP
moorings
Canada, km-03
Greenland, km-34
2005/06
Depth (m)
2004/05
2003/04
Time (days)
Time (days)
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Three years of low-pass filtered current vectors
km-03
km-30
Near surface
Near bottom
Time (Days)
Time (Days)
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Volume Transports from ADCP Surveys July/Aug. 2003
Robeson Channel 82 00N -0.70 Sv coastally trapped
Kennedy Channel, N 81 15N -0.76 Sv broad channel flow
Kennedy Channel, S 80 30N -0.63 Sv broad channel flow
Smith Sound 78 30N -0.68 Sv coastally trapped
Thule Section 76 30N Lauren
Cape York 74 30N 4.3 Sv eddy train?
Baffin Island 72 30N -4.8 Sv ring?
Baffin Island, coastal 72 30N -2.7 Sv
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Temperature
Latitude
Salinity