COMPASS Wednesday

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COMPASS Wednesday

Combined OCE MPO ATM Seminar Series

Wednesdays at 3:00 pm, Seminar Room SLAB 103 / Virtual SLAB 103
(unless stated otherwise)



Dr. Sharanya Majumdar
Department of Atmospheric Sciences, Rosenstiel School

An Unpredictable Journey Into Hurricane Predictability Research
Recording Available at COMPASS ON DEMAND

In this talk, I will start out by discussing some chance occurrences that eventually led me into hurricane predictability research.  Following the principles set out in Lorenz's legendary papers from the 1960s, I will first introduce my early research career phase on "targeted observations", which combined fieldwork, satellite and aircraft observations, data assimilation, and ensemble forecasting.  In the second half of the talk, I will raise a series of research questions tackled by past and present group members on genesis, track, and intensity change, with an increasing emphasis on connecting predictability to physical processes on multiple scales.


Dr. Amy Clement
Department of Atmospheric Sciences, Rosenstiel School

From Slow Science to Usable Science:
The Challenge of Projecting Climate Hazards
Recording Available at COMPASS ON DEMAND

As climate scientists, we are increasingly being asked to weigh in on the question of 'what will climate change look like for me / my home / my community / my company, etc.?' What I will present is an in-progress story about how I have come to approach this question. I will focus on research from the last several decades of good old-fashioned climate dynamics, and what the challenges are that make this a difficult, thus 'slow' problem. The discussion of the scientific challenges will be informed by my experiences working with a range of applied researchers and decision makers working to adapt to a rapidly changing climate with increasingly costly and inequitable risks.

Feb 07: Dr. Alexander Soloviev
Nova Southeastern University, Dania Beach, Florida

Physical Oceanographic Aspects of Upwelling Events
on the Southeast Florida Shelf
Alexander Soloviev, Alfredo Quezada, Megan Miller, Bernhard Riegl, and Richard Dodge
Recording Available at COMPASS ON DEMAND

Coral reef benthic communities are acutely sensitive to changes in environmental parameters such as temperature and nutrient concentrations. Physical oceanographic processes that induce the coastal upwelling therefore act as drivers of community structure on tropical reefs. The cause and frequency of upwellings and how they impact coral communities on the Southeast Florida shelf, however, are not fully understood. The classical wind induced coastal upwelling is not typical for western boundary current regions like the Straits of Florida. We have nevertheless observed prominent upwelling events during hurricane conditions. For example, during Hurricane Wilma 2005 a 4°C drop of the bottom water temperature was registered at an 11 m isobath on the Broward County shelf. Upwelling events can also be caused by internal wave solitons breaking on the continental shelf; an example is the upwelling on Conch Reef that has been studied experimentally (Leichter et al. 1996) and modeled with computational fluid dynamics tools (Miller et al. 2023). Another potential upwelling mechanism is associated with the southward jet attached on the Southeast Florida shelf (Soloviev et al. 2017), which lifts the cold deeper water towards the coast due to the Coriolis effect. This process is being elucidated from a year-long series of glider transects on the shelf between Ft. Lauderdale and Jupiter, FL (Quezada et al. 2023). The upwelling events bringing cold and rich with nutrients water to the coral reef benthic communities may alter, suppress, or provide a natural buffer against climate impacts and could potentially enhance the efficacy of spatial management and reef conservation efforts (Zhu et al. 2022).

Feb 14: Daniel Melo Costa Santos
Guest of Tiago Bilo, CIMAS
Oceanographic Institute, University of Sao Paulo, Brazil

Abyssal Warming and Freshening Process Drives the
Contraction and Homogenization of the AABW in the Argentine Basin
Recording Available at COMPASS ON DEMAND

This study investigates changes in abyssal water properties, with a specific focus on the Antarctic Bottom Water (AABW), using data collected in the northwest Argentine Basin from 2009 to 2022, along 34.5°S, at a trans-basin mooring line known as the South Atlantic Meridional Overturning Circulation Basin-wide Array (SAMBA). The analysis centers at the three most frequently sampled locations: 48.5°W, 47.5°W, and 44.5°W, where pressure-equipped inverted echo sounders are installed and identified as Sites BB, C, and D, respectively. The results reveal an increase in the potential temperature and a simultaneous decrease in salinity at abyssal depths across all locations, except at Site BB. There, a positive change is observed near the bottom, followed by a negative change just above it. A decrease in the buoyancy frequency (N) is detected in the region commonly occupied by the AABW at Sites C and D, while at Site BB, the changes are positive along the profile. The temperature variations are predominantly influenced by vertical movements of isopycnals (heave) rather than changes along them (spiciness). As a result of these abyssal variations, the AABW contracted and freshened at Sites C and D, as its colder layer descended faster than its warmer layer, resulting in a downward expansion of the latter. At Site BB, the AABW also freshened, but with a smaller rate.




Mar 13: NO SEMINAR (Spring Recess)

Mar 20: Lev Looney
Department of Atmospheric Sciences, Rosenstiel School
(one-hour MPO student seminar)

Mar 27: Paul Wojtal
Department of Ocean Sciences, Rosenstiel School
(one-hour OCE student seminar)

Apr 03: Lillian Henderson
Department of Ocean Sciences, Rosenstiel School
(one-hour OCE student seminar)

Apr 08 (Monday, Auditorium): Dr. Augustinus Ribal
Guest of Brian Haus, Department of Ocean Sciences

Department of Mathematics, Hasanuddin University, Makassar, Indonesia

Apr 10: Leah Chomiak
Department of Ocean Sciences, Rosenstiel School
(one-hour MPO student seminar)

Apr 17: Chong Jia
Department of Ocean Sciences, Rosenstiel School
(one-hour MPO student seminar)

Apr 24: Ivenis Pita
Department of Atmospheric Sciences, Rosenstiel School
(one-hour MPO student seminar)

May 01: Dr. Milan Curcic
Department of Ocean Sciences, Rosenstiel School

Dispersion of Short Waves Riding on Longer Waves