Workshop = Work in Progress If only I could get organized Data Overload Loving it No title.

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Presentation transcript:

Workshop = Work in Progress If only I could get organized Data Overload Loving it No title

July/August 2003 ADCP Survey Volume Flux Summary Sv Sv Sv Sv +4.3 Sv -4.8 Sv Greenland 0.7  0.07 Sv 1 Sv=10 6 m 3 /s or 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 track relative to ship (true East, unsorted) water track relative to ship (true North, unsorted) water track relative to bottom (true North, sorted) water track relative 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 HistogramIntegrated Histogram ADCP Calibration-2: ADCP-DGPS Velocity Vector Difference ( 2-min avg.)

Robeson Channel ADCP Velocity Aug.-7-11, 2003 Measured Detided = Measured-Tides Ellesmere Island 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 Sv Sv Sv Sv +4.3 Sv -4.8 Sv Greenland 0.7  0.07 Sv 1 Sv=10 6 m 3 /s or 5 Amazon R. or 200 Columbia R.

Greenland Ellesmere Island 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.

108-m

(a) (d) (c) (b) 108-m

(a) (c)(d) (b) Robeson ChannelKennedy Channel, N Smith SoundKennedy Channel, S

July/August 2003 ADCP Survey Volume Flux Summary Sv Sv Sv Sv +4.3 Sv -4.8 Sv Greenland 0.7  0.07 Sv 1 Sv=10 6 m 3 /s or 5 Amazon R. or 200 Columbia R.

108-m 303-m Along-shore ADCP currents July-27 through July-30, 2003: Volume flux ~ -2.7 Sv Is this the Baffin Island Current?

7/26, 03:00 to 7/29, 00:007/29, 00:00 to 7/30 09: m

Volume flux ~ -4.8 Sv 7/26, 03:00 to 7/29, 00: m

Along-shore ADCP currents July-30 through July-31, 2003: Volume flux ~ +4.3 Sv Is this the West Greenland Current?

First Mooring Result 2006 Ellesmere Island, Aug.-16, 2006: CT/CTD string recovery

Sadler (1976):Water, heat, and salt transports through Nares Strait, Ellesmere Island 0.1 m/s Greenland Ellesmere Island 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 Currents August 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-03Greenland, km / / /06 Three-year along-channel currents from 2 ADCP moorings Depth (m) Time (days)

Time (Days) Near surface Near bottom Three years of low-pass filtered current vectors Time (Days) km-03km-30

Robeson Channel82° 00’N-0.70 Svcoastally trapped Kennedy Channel, N81° 15’N-0.76 Svbroad channel flow Kennedy Channel, S80° 30’N-0.63 Svbroad channel flow Smith Sound78° 30’N-0.68 Svcoastally trapped Thule Section76° 30’NLauren Cape York74° 30’N+4.3 Sveddy train? Baffin Island72° 30’N-4.8 Svring? Baffin Island, coastal72° 30’N-2.7 Sv Volume Transports from ADCP Surveys July/Aug. 2003

Baffin Bay Nares Strait Labrador Sea Temperature Latitude Salinity Surface Properties along 25-day USCGC Healy Ship Track in 2003