Post on 05-Feb-2016
description
Workshop = Work in Progress
If only I could get organized
Data Overload
Loving it
No title
July/August 2003 ADCP Survey Volume Flux Summary
-0.70 Sv
-0.76 Sv
-0.63 Sv
-0.68 Sv
+4.3 Sv
-4.8 Sv
Greenland
0.70.07 Sv
1 Sv=106 m3/sor 5 Amazon R.or 200 Columbia R.
USCGC Healy ADCP Systems
Healy in snowy Seattle dry-dock
a bilge rat in the back?
well of the 75-kHz phased array?
system command and control
Ellesmere Island, Aug.-4, 3am:Start first ADCP survey
Greenland, Aug.-4, 6am:Finish first ADCP survey
Data Processing Challenge: Ice
ADCP Processing: Sorting and Screening Single Ping Data
water trackrelative to ship(true East, unsorted)
water trackrelative to ship(true North, unsorted)
water trackrelative to bottom(true North, sorted)
water trackrelative to bottom(true East, sorted)
Ensemble average
~ 1 hour
ADCP Calibration-1:Comparing ADCP to GPS-derived Ship’s Velocity Components
Looks good… but can’t really tell
North
East
Histogram Integrated Histogram
ADCP Calibration-2:ADCP-DGPS Velocity Vector Difference ( 2-min avg.)
Robeson ChannelADCP VelocityAug.-7-11, 2003
Measured
Detided =Measured-Tides
EllesmereIsland
108-m
108-m
•3-D detiding•2 constituents•Münchow (2000)•Local fit to data
•2-D detiding•8 constituents•Padman & Erofeeva (2004)•Global model + data assimilation
Two tidal removal techniques applied to Kennedy Channel
across-channel
along-channel
July/August 2003 ADCP Survey Volume Flux Summary
-0.70 Sv
-0.76 Sv
-0.63 Sv
-0.68 Sv
+4.3 Sv
-4.8 Sv
Greenland
0.70.07 Sv
1 Sv=106 m3/sor 5 Amazon R.or 200 Columbia R.
Greenland
EllesmereIsland
WindsAug. 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.
108-m
108-m
108-m
108-m
(a)
(d)
(c)
(b) 108-m
108-m 108-m
108-m
(a)
(c)(d)
(b)Robeson Channel Kennedy Channel, N
Smith Sound Kennedy Channel, S
July/August 2003 ADCP Survey Volume Flux Summary
-0.70 Sv
-0.76 Sv
-0.63 Sv
-0.68 Sv
+4.3 Sv
-4.8 Sv
Greenland
0.70.07 Sv
1 Sv=106 m3/sor 5 Amazon R.or 200 Columbia R.
108-m
303-m
Along-shore ADCP currentsJuly-27 through July-30, 2003:
Volume flux ~ -2.7 Sv
Is this theBaffin Island Current?
7/26, 03:00 to 7/29, 00:00 7/29, 00:00 to 7/30 09:00
108-m 108-m
Volume flux ~ -4.8 Sv
7/26, 03:00 to 7/29, 00:00
108-m
Along-shore ADCP currentsJuly-30 through July-31, 2003:
Volume flux ~ +4.3 Sv
Is this theWest Greenland Current?
First Mooring Result 2006
Ellesmere Island, Aug.-16, 2006: CT/CTD string recovery
Sadler (1976):Water, heat, and salt transports throughNares Strait, Ellesmere Island
0.1 m/s Greenland
EllesmereIsland 0 10 20
Distance (km)
100-m
300-m
500-m
700-m
5-week under-ice current measurements 1972
XX? ?? ADCP
CT/CTD
All recovered instruments have clean 3-year records
Low-pass-filtered depth-averaged CurrentsAugust 2003 through August 2006
km-03, Canada
km-24
km-30
km-34, Greenland
3 years
3-year record mean
2-day snapshot
Canada, km-03 Greenland, km-34
2004/05
2003/04
2005/06
Three-year along-channel currents from 2 ADCP mooringsD
epth
(m
)
Time (days) Time (days)
Time (Days)
Near surface
Near bottom
Three years of low-pass filtered current vectors
Time (Days)
km-03 km-30
Robeson Channel 82° 00’N -0.70 Sv coastally trapped
Kennedy Channel, N 81° 15’N -0.76 Sv broad channel flow
Kennedy Channel, S 80° 30’N -0.63 Sv broad channel flow
Smith Sound 78° 30’N -0.68 Sv coastally trapped
Thule Section 76° 30’N Lauren
Cape York 74° 30’N +4.3 Sv eddy train?
Baffin Island 72° 30’N -4.8 Sv ring?
Baffin Island, coastal 72° 30’N -2.7 Sv
Volume Transports from ADCP SurveysJuly/Aug. 2003
Baffin BayNares Strait
LabradorSea
Temperature
Latitude
Salinity
Surface Properties along 25-day USCGC Healy Ship Track
in 2003