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CATEGORIES:SMAST,Thesis/Dissertations
DESCRIPTION:Department of Estuarine and Ocean Sciences MS Thesis Defense "O
 ptical Characterization of Particle Size Distributions and Their Relations
 hip to Phytoplankton Pigment Composition in the Northern Gulf of Mexico" B
 y: В Kara Falvey Advisor Steven Lohrenz (UMass Dartmouth) Committee Member
 s Geoffrey Cowles (UMass Dartmouth), and Jefferson Turner (UMass Dartmouth
 ), Friday May 1, 2026 12:00 PM SMAST East 102-103 836 S. Rodney French Blv
 d, New Bedford and via Zoom Abstract: Optical characterization of particle
  size distributions, particle volumes, and particle number concentrations 
 was conducted and compared to phytoplankton size classes as inferred from 
 phytoplankton pigment composition in the region of the northern Gulf of Me
 xico (nGOM) influenced by the Mississippi and Atchafalaya River systems. U
 sing a Laser In-Situ Scattering and Transmissometer (LISST 100X), we acqui
 red vertical profiles of particle concentration and size from nearshore es
 tuarine regions to open ocean waters. Profiles of spectral beam attenuatio
 n using an underwater absorption and attenuation spectrometer (AC-9) were 
 acquired alongside the LISST measurements. These optical observations were
  compared to phytoplankton size classes as inferred from phytoplankton pig
 ment composition. Strong spatial gradients in particle volume and number c
 oncentration were observed in conjunction with variations in the magnitude
  of beam attenuation, with higher values in the estuary and inner shelf wa
 ters. The observed relationship between the spectral slope of the beam att
 enuation, Оі, corrected for colored dissolved organic matter (CDOM) absorp
 tion, and the slope of the LISST-derived particle size distribution, Оѕ, f
 ollowed general theoretical expectations, although there were notable devi
 ations, particularly at estuary and inner shelf stations. The near-surface
  particle number and volume concentrations were examined in relation to wa
 ter mass type as well as in relation to phytoplankton composition and size
  class as inferred from high-pressure liquid chromatography (HPLC) pigment
  analyses. Near-surface particle volume and number concentration were high
 est in estuary waters as compared to outer shelf waters. The median fracti
 on of total chlorophyll associated with the microphytoplankton size fracti
 on (20 вЂ“ 200 Ојm) was lower for mid-shelf stations compared to estuary a
 nd inner shelf stations. The median total volume fraction of larger partic
 les in the size range (20 вЂ“ 200 Ојm) for inner and mid-shelf stations wa
 s significantly lower than for estuary stations. Outer shelf stations demo
 nstrated relatively large variability in chlorophyll fractions associated 
 with the different size classes. Subsurface peaks were evident in vertical
  profiles of particle volume and number concentration and coincided with d
 istinct in phytoplankton pigment composition, providing insight about vert
 ical variations in community composition in relation to physical gradients
 . These findings provide novel information about particle characteristics 
 and their relationship to phytoplankton composition in the nGOM. Join Meet
 ing https://umassd.zoom.us/j/92975455209 Note: Meeting ID and passcode req
 uired, email contact to obtain. For additional information, please contact
  Callie Rumbut at c.rumbut@umassd.edu\nEvent page: /
 events/cms/optical-characterization-of-particle-size-distributions-and-the
 ir-relationship-to-phytoplankton-pigment-composition-in-the-northern-gulf-
 of-mexico-by-kara-falvey.php\nEvent link: https://umassd.zoom.us/j/9297545
 5209
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</script><p>Department of Estuarine and Oce
 an Sciences</p>\n<p>MS Thesis Defense</p>\n<p>"Optical Characterization of
  Particle Size Distributions and Their Relationship to Phytoplankton Pigme
 nt Composition in the Northern Gulf of Mexico"</p>\n<p>By: В Kara Falvey</
 p>\n<p>Advisor</p>\n<p>Steven Lohrenz (UMass Dartmouth)</p>\n<p>Committee 
 Members</p>\n<p>Geoffrey Cowles (UMass Dartmouth)\, and Jefferson Turner (
 UMass Dartmouth)\,</p>\n<p>Friday May 1\, 2026</p>\n<p>12:00 PM</p>\n<p>SM
 AST East 102-103</p>\n<p>836 S. Rodney French Blvd\, New Bedford</p>\n<p>a
 nd via Zoom</p>\n<p>Abstract:</p>\n<p>Optical characterization of particle
  size distributions\, particle volumes\, and particle number concentration
 s was conducted and compared to phytoplankton size classes as inferred fro
 m phytoplankton pigment composition in the region of the northern Gulf of 
 Mexico (nGOM) influenced by the Mississippi and Atchafalaya River systems.
  Using a Laser In-Situ Scattering and Transmissometer (LISST 100X)\, we ac
 quired vertical profiles of particle concentration and size from nearshore
  estuarine regions to open ocean waters. Profiles of spectral beam attenua
 tion using an underwater absorption and attenuation spectrometer (AC-9) we
 re acquired alongside the LISST measurements. These optical observations w
 ere compared to phytoplankton size classes as inferred from phytoplankton 
 pigment composition. Strong spatial gradients in particle volume and numbe
 r concentration were observed in conjunction with variations in the magnit
 ude of beam attenuation\, with higher values in the estuary and inner shel
 f waters. The observed relationship between the spectral slope of the beam
  attenuation\, Оі\, corrected for colored dissolved organic matter (CDOM) 
 absorption\, and the slope of the LISST-derived particle size distribution
 \, Оѕ\, followed general theoretical expectations\, although there were no
 table deviations\, particularly at estuary and inner shelf stations. The n
 ear-surface particle number and volume concentrations were examined in rel
 ation to water mass type as well as in relation to phytoplankton compositi
 on and size class as inferred from high-pressure liquid chromatography (HP
 LC) pigment analyses. Near-surface particle volume and number concentratio
 n were highest in estuary waters as compared to outer shelf waters. The me
 dian fraction of total chlorophyll associated with the microphytoplankton 
 size fraction (20 вЂ“ 200 Ојm) was lower for mid-shelf stations compared t
 o estuary and inner shelf stations. The median total volume fraction of la
 rger particles in the size range (20 вЂ“ 200 Ојm) for inner and mid-shelf 
 stations was significantly lower than for estuary stations. Outer shelf st
 ations demonstrated relatively large variability in chlorophyll fractions 
 associated with the different size classes. Subsurface peaks were evident 
 in vertical profiles of particle volume and number concentration and coinc
 ided with distinct in phytoplankton pigment composition\, providing insigh
 t about vertical variations in community composition in relation to physic
 al gradients. These findings provide novel information about particle char
 acteristics and their relationship to phytoplankton composition in the nGO
 M.</p>\n<p>Join Meeting</p>\n<p>https://umassd.zoom.us/j/92975455209</p>\n
 <p>Note: Meeting ID and passcode required\, email contact to obtain.</p>\n
 <p>For additional information\, please contact Callie Rumbut at c.rumbut@u
 massd.edu</p><p>Event page: <a href="/events/cms/opt
 ical-characterization-of-particle-size-distributions-and-their-relationshi
 p-to-phytoplankton-pigment-composition-in-the-northern-gulf-of-mexico-by-k
 ara-falvey.php">/events/cms/optical-characterization
 -of-particle-size-distributions-and-their-relationship-to-phytoplankton-pi
 gment-composition-in-the-northern-gulf-of-mexico-by-kara-falvey.php</a><br
 >Event link: </p></body></html>
DTSTAMP:20260419T053151
DTSTART;TZID=America/New_York:20260501T120000
DTEND;TZID=America/New_York:20260501T130000
LOCATION:SMAST 101-103
SUMMARY;LANGUAGE=en-us:"Optical Characterization of Particle Size Distribut
 ions and Their Relationship to Phytoplankton Pigment Composition in the No
 rthern Gulf of Mexico" by Kara Falvey
UID:4c470162a67fb0794142bc3d1c1b7e10@www.umassd.edu
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