Spurious internal wave generation during data assimilation in eddy resolving ocean model simulations Keshav Raja, Research Faculty at FSU, and other NOPP GIW team members have a new paper in revision at Ocean Modelling! Data assimilation combines observations with ocean models to improve ocean state predictions beyond the capabilities of observations or models alone, but it can introduce problems like initialization shocks leading to spurious internal waves. These spurious waves disrupt the model energetics and must be controlled for accurate representation of high-frequency, small-scale ocean dynamics in assimilative model simulations. … Read More
NOPP GIW Internal Wave Resolving array mooring deployed
One of the big goals of the 2023 NOPP GIW field work was recovering and re-deploying the IWR mooring after a 200-day deployment as part of the SWOT Oceanographic Mission Cal/Val. anchordown We developed the Scripps Hybrid Real-Time Mooring (HRTM) system for SWOT Cal/Val. The system combines a sub-surface taut mooring (600 m – 4500 m) with a ocean-wave-powered Wirewalker profiler (0-500m) and a surface buoy. Data from the moored instruments are telemetered to shore in real-time. The HRTM provides continuous vertical and time mapping of the upper 500m, and … Read More
IWR Team out on the R/V Sally Ride
We are just shy of one week at sea aboard the R/V Sally Ride and with a combination of groups from SIO (MOD and Send labs) and the WHOI (CPIES Team led by me, Magadalena Andres). We are all working hard, side by side, as there is a lot happening on this cruise! This is my first cruise that includes both CPIES recoveries and CPIES deployments…usually it’s one or the other and I put myself in the mindset for that type of cruise. And unusually a cruise is related to … Read More
IWR team is ready to head back to the SWOT cal/val site!
The NOPP/SWOT container on the truck and headed to Alameda to meet the R/V Sally Ride! Preparations are underway for the next cruise leg of the NOPP IWR team mooring deployments (and recoveries). A total of 11 SWOT cal/val moorings and 3 PIES were deployed last February along the track of the SWOT satellite mission off of California. These moorings are one component of the fast repeat cal/val phase of the NASA-led SWOT mission. Four of these moorings, deployed and designed by the SIO teams, were full depth ocean moorings … Read More
100 days of SWOT / NOPP data!
Profiling performance for the NOPP / SWOT calval moorings has been ongoing and excellent at all moorings for 100 days! A total of ~18,000 round trips from the Wirewalkers have been collected from the 4 moorings. This equates to a 500 m upcast profile every 35 min at each mooring on average. There is a great deal of variability between the four moorings (each separated by ~30 km), even in the long-wavelength internal tide. Here is the Wirewalker profiler data from one of the moorings. It shows the awesome temporal … Read More
At sea with Jess and her cluster of CPIES
Playing chicken with the string of late-winter Pacific storms and racing the clock to deploy a ship-load of scientific gear within the SWOT Cal/Val site west of California, the crew and scientists on the MV Bold Horizon have had an intense cruise. Among them is Jessica Kozik – not only is Jess the only cruise participant from Woods Hole Oceanographic Institution (WHOI), but she also happens to be the only woman aboard. And she’s working with an instrument that is pretty new to her. Jess is here to deploy 3 … Read More
Detangling the complicated web of internal waves
Long term ocean observations can help us detangle the intricate web of internal wave across the globe Global ocean maps illustrate the low-mode internal wave field at the M2 tidal frequency (color-scale image) in relation to historical ocean repeat data collections: the WOCE/GO-SHIP transects (top center), the Scripps high-density XBT archive (bottom left), and the AOML high-density XBT archive (bottom right). The tidal internal waves, which are hypothesized to be a significant source of energy for the broadband internal wave field, are heterogenously distributed throughout the ocean basins. Representation of … Read More