Comparison of Wind Speed and Wind Stress to Ocean Ambient Sound

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Presentation transcript:

Comparison of Wind Speed and Wind Stress to Ocean Ambient Sound LT Paul Cocker

High-Frequency Acoustic Recording Package (HARP) Up to 200kHz sampling rate 1.92 TB of data per instrument deployment 55 days of continuous sampling at 200kHz About 1 year of continuous sampling at 30kHz

HARP Deployment 2 25 JAN to 04 June 2007 5 minutes of sampling at 200kHz; 10 minutes off Data stored in 75 second segments Data down-sampled to 20kHz One week (9-15) of each month selected for analysis

Wind Speeds obtained from buoys 46042 and 46028

Wind Stress τ = ρcpU2 ρ = air density cp = drag coefficient U = wind speed Wind stress is the vertical transfer of horizontal momentum

9-15 APR 2007

Is one better than the other?

Not Statistically Significant 95%

Conclusions Wind Stress may be a better indicator of the changes in ambient noise, but sample size was too small For mid-range frequencies, the relationship between ambient noise and wind stress is linear above .05 N/m2

Future Work Increase sample size by shifting from weeks to days Characterize the relationship between ocean ambient noise and wind stress over a broader range of frequencies. Hydrophone sensitivity needs to be better quantified.