In October 2024, the internal-wave resolving (IWR) array mooring team set out on another voyage to recover field instruments, including a high vertical-resolution mooring system and bottom mounted, current-and-pressure-equipped inverted echo sounders (CPIESs), as part of the NOPP-GIW program to better predict internal waves in the ocean. Manifested as density disturbances in the ocean interior, these internal waves are generated by surface wind and tidal flows interacting with bottom ridges. Their generation, propagation and dissipation have critical implications for coastal dynamics and water-mass mixing in the Earth’s climate system. The … Read More
Spring SQUID deployments across ocean basins
EM-APEX profiling floats measuring temperature, salinity, horizontal currents, and turbulence are continuing to be deployed into the global Sampling QUantitative Internal-wave Distributions (SQUID) array. This spring, 7 floats were launched from the R/V Marcus G. Langseth in the South Atlantic on GO-SHIP repeat hydrography line A13.5, and another was launched from the R/V Kilo Moana on a short cruise to the Kauai Channel—a key location of past internal wave study in the Hawaii Ocean Mixing Experiment. SQUID floats are characterizing the internal wave energy levels in a range of ocean … Read More
Internal tide energy fluxes from real-time HYCOM simulations
The IWR HYCOM Team uses real-time realistically forced global ocean HYCOM simulations with Data Assimilation (DA) to compute semidiurnal-band monthly-mean energy fluxes for modes 1-3 in the vicinity of the IWR array (white dots) at the US Westcoast. The HYCOM simulation has a horizontal resolution of 4 km, is forced with 3-hourly wind and tides, and assimilates observations to enhance accuracy. The fluxes are computed for every month since March 2023 and display significant time variability. The southward propagating internal tides originate from the Mendocino Escarpment, while the eastward propagating … Read More
AGU highlighted NOPP-GIW GRL paper
We are excited to share the Research Spotlight highlighting our GRL paper, “Phase-Accurate Internal Tides in a Global Ocean Forecast Model: Potential Applications for Nadir and Wide-Swath Altimetry” has been published on Eos.org. Here’s the direct link to the article: https://eos.org/research-spotlights/step-aside-internal-tides-supercomputer-modeling-improves-satellite-altimetry-precision
New paper alert! Yadidya et al 2024
New paper led by Yadidya, the U-Michigan based NOPP-GIW IWR Modelling team postdoc! Tidal flow over topographic features on the seafloor generates vertical displacements along the interfaces of ocean layers that have different densities. These vertical displacements at tidal frequencies are known as internal tides. Internal tide displacements are largest well below the sea surface, but also display a sea surface height (SSH) signature that is large enough to be measured by satellite altimeters. Removing internal tide signals from satellite altimeter SSH allows for a more accurate accounting of non-tidal … Read More
January 2024 Annual Meeting Success!
We had a great annual NOPP meeting at the Marine Research Center of USM in Gulfport (1/24-1/25) to discuss the project results from the 6 teams involved. The meeting featured both poster and oral presentations by students, postdocs, and PIs. In addition we had invited additional speakers from outside the project to provide a broader perspective: Jacqueline McSweeney from Stony Brook University: New Observations of Internal Waves in the New York Bight Julian Simeonov from NRL: Sediment mobilization by internal waves/tides on the California shelf Ian Stokes from Scripps Insitution … Read More
NOPP GIW presenters at OSM 2024
The 2024 Ocean Sciences Meeting will be held in New Orleans this year! The full schedule can be viewed here. Check our the various NOPP GIW (and related) presentations below: Monday Posters: DO14A-2473 Improving the representation of internal waves in data assimilative ocean model simulations: Keshav Raja, Alexandra Bozec, Eric Chassignet, Maarten C Buijsman Tuesday Talks: Session: PS23A – Internal Waves and Their Interactions with (Sub)mesoscale Circulation and Seafloor Tuesday Posters: PS24A-2061 Submesoscale and Tidal Impacts on Bottom Boundary Layer in the Brazil Basin Yonglin Huang, Annalisa Bracco, Jonathan Gula, Kurt L … Read More