ellesmere island coast in kennedy channel, aug.-12, 2009
DESCRIPTION
Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009. Velocity: Long-Range Sonars. Sonars send and receives acoustic waves Measured Doppler shift proportional to velocity 75 kHz transducers. Rigid Backbone allowed to Pitch and Roll, but NOT Change Heading. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009](https://reader035.vdocument.in/reader035/viewer/2022081520/568166c3550346895ddacfa2/html5/thumbnails/1.jpg)
1 of 27Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009
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Magnetic Compass unusuable:
Kennedy Channel ~2800 nTFram Strait ~ 5800 nT
magnetic field strength
Velocity:Long-Range
Sonars• Sonars send and receives acoustic waves• Measured Doppler shift proportional to
velocity• 75 kHz transducers
Rigid Backbone allowed toPitch and Roll, but NOTChange Heading
![Page 3: Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009](https://reader035.vdocument.in/reader035/viewer/2022081520/568166c3550346895ddacfa2/html5/thumbnails/3.jpg)
Low-Pass Filtered Current Vectors at Center of Channel
![Page 4: Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009](https://reader035.vdocument.in/reader035/viewer/2022081520/568166c3550346895ddacfa2/html5/thumbnails/4.jpg)
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High-resolution Power-spectra of Depth-averaged Flow at KS10
All frequencies
Diurnal band
Semi-diurnal band
![Page 5: Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009](https://reader035.vdocument.in/reader035/viewer/2022081520/568166c3550346895ddacfa2/html5/thumbnails/5.jpg)
Mean Along-Channel Velocity(cm/s)
Along-Channel Freshwater Flux(mSv per km per meter rel. to 34.8)
Along-Channel velocity fluctuations(cm/s)
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2004/05
2003/04
2005/06
Three-year along-channel currents from ADCP mooring (KS02)De
pth
(m)
![Page 7: Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009](https://reader035.vdocument.in/reader035/viewer/2022081520/568166c3550346895ddacfa2/html5/thumbnails/7.jpg)
Winter(Landfast Ice)
Summer(Mobile Ice)
Spectral Density(cm/s)^2 per cpd
10 Days
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Spectral DensityVolume Flux
Spectral DensityAlong-Channel Sealevel Difference
Cumulative Varianceby frequency
Cumulative Varianceby time scale (1/frequency)
Chosen Cut-Off
Selection of Time Scale:
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Good Filter:
Bad Filter:
Filter Design
Lanczos Raised Cosine
Running Average
Cut-Off: ~20 Days
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Residual root mean square:0.19 Sv
Correlation: r2=0.71Regression: a= -0.84 SvRegression b=8.54 Sv/m
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2-D Power-Spectrum(dispersion curves?)
http://www.mps.mpg.de/projects/seismo/NA4/SW/power_spectrum.html
From: Max-Planch InstituteSolar Systems Research
[Tim
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[Space Scale]