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

2. 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

4. 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

6. Wind Speeds obtained from buoys 46042 and 46028

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

11. 9-15 APR 2007

14. Is one better than the other?

15. Not Statistically Significant
95%

17. 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

18. 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.