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Surface Currents from HF Radar in the Beaufort Sea. A Presentation to the Alaska Marine Science Symposium January 25, 2006 Dave Musgrave, Hank Statscewich, Rachel Potter (UAF) Pete Lilleboe, Belinda Lipa (CODAR Ocean Sensors).

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Surface currents from hf radar in the beaufort sea

Surface Currents from HF Radar in the Beaufort Sea

A Presentation to the Alaska Marine Science Symposium

January 25, 2006

Dave Musgrave, Hank Statscewich, Rachel Potter (UAF)

Pete Lilleboe, Belinda Lipa (CODAR Ocean Sensors)


Sponsored by minerals management service and noaa through national ocean partnership program
Sponsored by Minerals Management Service and NOAA through National Ocean Partnership Program

Thanks to British Petroleum Alaska

and

Alaska Clean Seas


Study the temporal and spatial variability of surface currents during ice-free and mixed ice/open water conditions using HF radar

Beaufort Sea 101: Under open water conditions:

Winds from east, westward currents

Winds from west, eastward currents

Under mixed ice/open water conditions:

How well does HF radar work for surface currents?

Can HF radar be used to detect ice floes?

New technology: switchable frequencies (12 and 25 Mhz)


Hf radar in the beaufort sea
HF radar in the Beaufort Sea currents during ice-free and mixed ice/open water conditions using HF radar


Beaufort Sea HF Radar Project Data Recovery Rate: currents during ice-free and mixed ice/open water conditions using HF radar

Solid Dashes represent when radial files are made, gaps occur when the system was down.

Retrofit with Dual Frequency Rx Antennas

APMs with Bruce

SITE

VISITS:

Install WEST

Install ENDI

Trouble-

shoot

Repeat APMs, Remove 12 MHz Tx “Trap”

Retrofit with Repaired 12 MHZ Tx “Trap”

Sent switch.pl code

WEST

Operational = 79%

25

12

testing

25

12 MHz

12 MHz

ENDI

Operational = 91%

12

25

12 MHz

25

12 MHz

25 MHz

12 MHz


12 MHz currents during ice-free and mixed ice/open water conditions using HF radar

24 MHz


CODAR: currents during ice-free and mixed ice/open water conditions using HF radar

Mean U = - 17 cm/s

Mean V = 3 cm/s

STD = 23.3 cm/s

Wind:

Mean U = - 654 cm/s

Mean V = 184 cm/s

STD = 682 cm/s


At a 2 hour lag Wind and Currents currents during ice-free and mixed ice/open water conditions using HF radar

Correlation Amplitude = 0.8

Rotation Angle = 18 degrees CW (from wind to current)


Conclusions
Conclusions currents during ice-free and mixed ice/open water conditions using HF radar

  • Easterly Winds give Westward Currents

    • (most of the time)

    • current field not uniform

  • Occasional on-offshore transport

  • Sea ice detection? need SAR


THANK YOU currents during ice-free and mixed ice/open water conditions using HF radar


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