1 of 27 Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009.

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Presentation transcript:

1 of 27 Ellesmere Island coast in Kennedy Channel, Aug.-12, 2009

Magnetic Compass unusuable: Kennedy Channel~2800 nT Fram 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 to Pitch and Roll, but NOT Change Heading

Low-Pass Filtered Current Vectors at Center of Channel

4 of 27 High-resolution Power-spectra of Depth-averaged Flow at KS10 All frequencies Diurnal band Semi-diurnal band

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)

6 of / / /06 Three-year along-channel currents from ADCP mooring (KS02) Depth (m)

Winter (Landfast Ice) Summer (Mobile Ice) Spectral Density (cm/s)^2 per cpd 10 Days

8 of 27 Spectral Density Volume Flux Spectral Density Along-Channel Sealevel Difference Cumulative Variance by frequency Cumulative Variance by time scale (1/frequency) Chosen Cut-Off Selection of Time Scale:

9 of 27 Good Filter: Bad Filter: Filter Design Lanczos Raised Cosine Running Average Cut-Off: ~20 Days

10 of 27 Residual root mean square: 0.19 Sv Correlation: r 2 =0.71 Regression: a= Sv Regression b=8.54 Sv/m

2-D Power-Spectrum (dispersion curves?) From: Max-Planch Institute Solar Systems Research [Time Scale] [Space Scale]