BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Rethinking Antarctic Polynya Productivity: The Impact of Ice-Adjac
 ency Effects on NPP Estimates along Icy Coasts - Hilde Oliver\, Woods Hole
  Oceanographic Institution
DTSTART:20250702T130000Z
DTEND:20250702T140000Z
UID:TALK233455@talks.cam.ac.uk
CONTACT:Dr Yohei Takano
DESCRIPTION:Ocean color-based estimates of Antarctic net primary productiv
 ity (NPP) have indicated low nearshore productivity in ice-adjacent waters
 \, contrasting with coupled physical-biogeochemical models. To understand 
 this discrepancy\, we assessed satellite records of polynya NPP by compari
 ng field data with two satellite imagery datasets derived using different 
 processing schemes. Our results indicate historical underestimation of chl
 orophyll a (Chl) for imagery obtained using default atmospheric correction
  processing within approximately 100 km of ice-covered coastlines due to a
 djacency effects. Using radiative transfer modeling\, we find that biases 
 in ocean color polynya observations due to adjacency effects correspond to
  the high albedo of ice and snow. When applying an atmospheric correction 
 processing scheme more robust to adjacency contamination\, estimates of NP
 P more than doubled in 65 % of polynyas\, especially smaller eastern Antar
 ctic polynyas. Adjacency effects should therefore be managed when analyzin
 g spatial and temporal trends in Antarctic coastal primary productivity.
LOCATION:BAS Seminar Room 1
END:VEVENT
END:VCALENDAR