BEGIN:VCALENDAR VERSION:2.0 X-WR-CALNAME:EventsCalendar PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York LAST-MODIFIED:20240422T053451Z TZURL:https://www.tzurl.org/zoneinfo-outlook/America/New_York X-LIC-LOCATION:America/New_York BEGIN:DAYLIGHT TZNAME:EDT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 DTSTART:19700308T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU END:DAYLIGHT BEGIN:STANDARD TZNAME:EST TZOFFSETFROM:-0400 TZOFFSETTO:-0500 DTSTART:19701101T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT CATEGORIES:Lectures and Seminars,SMAST,SMAST Seminar Series DESCRIPTION:Seminar AnnouncementDepartment of Fisheries Oceanography "Physi cal and Biogeochemical Controls on Ocean Acidification in the U.S. Northea st: Insights from a Coupled Physical–Biogeochemical Model"Dr. Lu WangRes earch Assistant Professor, Fisheries Oceanography, UMass Dartmouth Wednesd ay, October 14, 20263:00 - 4:00 pmSMAST E 101-103 and via Zoom Abstract: T he Northeast Biogeochemistry and Ecosystem Model (NeBEM) was developed by coupling the Northeast Coastal Ocean Forecast System (NECOFS) with the Eur opean Regional Seas Ecosystem Model (ERSEM) to simulate the coupled physic al and biogeochemistry dynamics of the U.S. Northeast continental shelf. A pplied to 2017-2018, the model reproduced the seasonal variability of key physical, chemical, biological variables, providing a robust framework for investigating ocean acidification (OA) across environments ranging from e stuaries to the continental shelf. Process-oriented analyses revealed dist inct regional drivers of aragonite saturation state (Ωa). Variability in Ωa was primarily influenced by variability dissolved inorganic carbon (DI C) in the Middle Atlantic Bight (MAB), Georges Bank (GB) and Scotian Shelf (SS), whereas both DIC and total alkalinity (TA) contributed substantiall y in the Gulf of Maine (GOM). Strong tidal-mixing and river-shelf interact ion regions, including the western Scotian Shelf, Bay of Fundy, Nantucket Shoals, Long Island Sound, and estuaries connected to the northern GOM, we re identified as particularly vulnerable to OA. From January through April , the inner shelf, particularly near river mouths, experienced low Ωa val ues (\nEvent page: https://www.umassd.edu/events/cms/10-14-26-physical-and -biogeochemical-controls-on-ocean-acidification.php\nEvent link: https://u massd.zoom.us/j/93758230260 X-ALT-DESC;FMTTYPE=text/html:

Seminar Announcement
Departm ent of Fisheries Oceanography

"Physical and Biogeochemical Control s on Ocean Acidification in the U.S. Northeast: Insights from a Coupled Ph ysical–Biogeochemical Model"
Dr. Lu Wang
Research Assistant Profes sor\, Fisheries Oceanography\, UMass Dartmouth

Wednesday\, October 14\, 2026
3:00 - 4:00 pm
SMAST E 101-103 and via Zoom

Abstr act:

The Northeast Biogeochemistry and Ecosystem Model (NeBEM) was developed by coupling the Northeast Coastal Ocean Forecast System (NECOFS ) with the European Regional Seas Ecosystem Model (ERSEM) to simulate the coupled physical and biogeochemistry dynamics of the U.S. Northeast contin ental shelf. Applied to 2017-2018\, the model reproduced the seasonal vari ability of key physical\, chemical\, biological variables\, providing a ro bust framework for investigating ocean acidification (OA) across environme nts ranging from estuaries to the continental shelf.

Process-orien ted analyses revealed distinct regional drivers of aragonite saturation st ate (Ωa). Variability in Ωa was primarily influenced by variability diss olved inorganic carbon (DIC) in the Middle Atlantic Bight (MAB)\, Georges Bank (GB) and Scotian Shelf (SS)\, whereas both DIC and total alkalinity ( TA) contributed substantially in the Gulf of Maine (GOM).

Strong t idal-mixing and river-shelf interaction regions\, including the western Sc otian Shelf\, Bay of Fundy\, Nantucket Shoals\, Long Island Sound\, and es tuaries connected to the northern GOM\, were identified as particularly vu lnerable to OA. From January through April\, the inner shelf\, particularl y near river mouths\, experienced low Ωa values (<1.0)\, with the greates t spatial extent in March. This seasonal minimum was associated with eleva ted surface DIC levels resulting from atmospheric CO2 uptake and the trans port of DIC-rich water through the Northeast Channel. On the outer shelf\, slope-water intrusion supplied substantial DIC\, while warm-core rings an d eddies enhanced the onshore DIC transport.

The simulated normali zed TA-DIC (nTA:nDIC) relationship agreed well with observations\, support ing the model’s representation of the major biogeochemical processes aff ecting carbonate chemistry. Regional variations in the nTA:nDIC slope refl ected contrasting biogeochemical pathways: nitrification and denitrificati on were primary contributors to TA and DIC variability in the GOM and MAB\ , air-sea CO2 exchange dominated in offshore waters\, and multiple interac ting processes shaped carbonate chemistry in the SS and GB. These findings provide new insights into the regional variability of ocean acidification and its underlying processes across the U.S. Northeast shelf ecosystem.\n

Join Meeting
http s://umassd.zoom.us/j/93758230260
Note: Meeting ID and passcode requ ired\, email contact to obtain.

For additional information\, pleas e contact Callie Rumbut at c.rumbut@umassd.edu

Event page: https://www.umassd.edu/events/cms/10-14- 26-physical-and-biogeochemical-controls-on-ocean-acidification.php
Event link: https://umas sd.zoom.us/j/93758230260

DTSTAMP:20261005T214812 DTSTART;TZID=America/New_York:20261014T150000 DTEND;TZID=America/New_York:20261014T160000 LOCATION:SMAST East 101-103 SUMMARY;LANGUAGE=en-us:Physical and Biogeochemical Controls on Ocean Acidif ication in the U.S. Northeast: Insights from a Coupled Physical–Biogeoch emical Model UID:1ff22337bafd1a4f0426bb0e114d0d73@www.umassd.edu END:VEVENT END:VCALENDAR