COMPASS Wednesday

GET STARTED
1
Request Info
2
Visit
3
Apply
GET STARTED
1
Request Info
2
Visit
3
Apply
COMPASS Wednesday
COMPASS WEDNESDAY

Combined OCE MPO ATM Seminar Series

FALL 2019
Wednesdays at 3:00 pm, Seminar Room SLAB 103

Aug 21: NO SEMINAR (room not available)

Aug 28: Dr. Harry DeFerrari
Professor Emeritus, Department of Ocean Sciences, RSMAS

Sixty Years of Ocean Acoustics Research and Academics at the University of Miami

Throughout the cold war and for decades after, a top priority of the US Navy has been Anti-Submarine Warfare – ASW. The Sound Surveillance System – SOSUS, used for the underwater acoustic tracking of Soviet submarines over the world's deep ocean basins, and US submarine silencing programs were two vast classified undertakings with a cost of a significant fraction of the country's GNP. Both programs required continuing evolution in the understanding of underwater acoustics, especially sound transmission though a randomly fluctuating ocean. To that end, ONR sponsored research and academic programs at several universities and research labs around the country. Research was both basic and applied, and the academic programs produced MS and PhD degrees in ocean acoustics. One of these research program at the University of Miami, called project MIMI, led to the major discovery of phase coherent sound transmission and a direct observable relation between oceanographic and acoustic variations. It can be argued that these results set the course of research in underwater acoustics for the basic research community for the next fifty years. In this presentation, the ocean acoustics research and academic programs of RSMAS are reviewed, from the early days of project MIMI to the present. More than 60 graduate degrees have been awarded with research focus on ocean acoustics. While SOSUS has become obsolete, the basic research program lives on. The understanding of ocean acoustics continues to evolve. Concerns about the effects of manmade sounds on marine mammals and the geo-acoustic interaction of sound with the ocean bottom in shallow oceans are new drivers. The digital revolution has enabled new compact experimental instrumentation making possible experiments in most all of the world's oceans. Numerical methods and computational methods have advanced propagation modelling leading to new understanding.

Sep 04: Dr. Milan Curcic
Department of Ocean Sciences, RSMAS

Revised Estimates of Ocean Surface Drag in Strong Winds

We revisit the momentum budget approach to estimating the air-sea drag coefficient in hurricane-force winds. To bridge the gap between extremely young windsea in the laboratory and the well-developed sea state in the field, we measure the drag coefficient in strong winds with and without mechanically generated background waves. We identify an error in the analysis of previously published drag estimates, and present the corrected data. Drag estimates from new experiments, using momentum budget and eddy-covariance methods in wind-only conditions, agree with field measurements in low-to-moderate winds, and previous laboratory measurements in hurricane-force winds. We find drag coefficient saturation at 2.6∙10–3 and U10 ≈ 25 ms–1, in agreement with previous laboratory results. However, introducing a background wave field increases the drag coefficient beyond the previously established level of saturation, suggesting that the wind-only laboratory studies may be underestimating the drag coefficient. The drag saturation is correlated with the limit in the wave development. Our results suggest that the drag coefficient estimates in the laboratory are largely dependent on the level of wave development.

Sep 11: AVAILABLE

Sep 18: Dr. Josefina Olascoaga
Department of Ocean Sciences, RSMAS

Sep 25: AVAILABLE

Oct 02: AVAILABLE

Oct 09: AVAILABLE

Oct 16: AVAILABLE

Oct 23: Joshua Wadler
Department of Ocean Sciences, RSMAS
(one-hour MPO student seminar)

Oct 30: Dr. Christine Wiedinmyer
Invited Speaker of the Department of Atmospheric Sciences
CIRES, University of Colorado Boulder

Nov 06: Breanna Zavadoff
Department of Atmospheric Sciences, RSMAS
(one-hour MPO student seminar)

Nov 13: Samantha Kramer
Department of Atmospheric Sciences, RSMAS
(one-hour ATM student seminar)

Nov 20: Kay McMonigal
Department of Ocean Sciences, RSMAS
(one-hour MPO student seminar)

Nov 27: NO SEMINAR (Thanksgiving Recess)

 

Future Semester Preview:

Jan 29: NO SEMINAR (room not available)