July 7, 2022 — A new study led by Woods Hole Oceanographic Institution shows a significant increase in frequency of warm saltwater intrusions from the deep ocean to the continental shelf along the Middle Atlantic Bight, which extends from the Gulf of Maine to Cape Hatteras, North Carolina. Using data collected from NOAA’s National Marine Fisheries Service Ecosystem Monitoring program, as well as data collected from the fishing industry, the study’s results show that ocean exchange processes have greatly changed over the past 20 years in this region.
I think the reason the paper is so important is because it quantifies an ocean process changing, potentially as a direct result of ocean warming and more stratification,” said Glen Gawarkiewicz, WHOI senior scientist and paper corresponding author. “These findings could also have major shelf ecosystem implications. Given the increased frequency of mid-depth salty intrusions along the Mid-Atlantic Bight, it will be necessary to properly resolve this process in numerical simulations in order to account for salt budgets for the continental shelf and slope”
“This is a tremendous opportunity for dialogue with the fishing community, helping them recognize these mid depth intrusions once they log a profile. Then, they can use it to decide where to fish and focus the bulk of their work,” Gawarkiewicz said. “Future work is necessary to determine how the increasing frequencies of this important process may be affecting continental shelf heat and salt balances as well as broader impacts to the continental shelf ecosystem. This study is valuable in quantifying processes that may be hastening that ecosystem realignment, especially when addressing things like food insecurity.”
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