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SUMMARY:Polar Oceans Seminar Talk - Laura Taylor - Laura Taylor (British A
 ntarctic Survey and University of Cambridge)
DTSTART:20260121T140000Z
DTEND:20260121T150000Z
UID:TALK241663@talks.cam.ac.uk
CONTACT:Katherine Turner
DESCRIPTION:Giant Antarctic iceberg calving is projected to increase with 
 climate change\, affecting ocean circulation\, nutrient supply\, and carbo
 n cycling. These icebergs can stimulate primary production and influence S
 outhern Ocean carbon fluxes through physical and biogeochemical modificati
 on of the upper ocean\, yet the underlying biogeochemical mechanisms remai
 n poorly constrained. Here we investigate the coupled effects of meltwater
  input and nutrient dynamics around two of the largest known icebergs—A-
 76A and A-23A—using an approach that incorporates silicon isotopes to ex
 amine nutrient cycling. Around A-76A\, enhanced glacial meltwater input co
 incides with dynamic nutrient variability and strong silicon isotope fract
 ionation\, consistent with a diatom bloom. In contrast\, waters around A-2
 3A show minimal enhancement of glacial meltwater input and are nutrient-ri
 ch but show no silicon isotope fractionation\, indicating minimal biologic
 al uptake. These contrasting regimes reveal that iceberg influence on ocea
 n biogeochemistry is highly heterogeneous\, likely reflecting differences 
 in meltwater delivery and local circulation. Our findings demonstrate that
  silicon isotopes serve as sensitive tracers of biological response in ice
 berg-affected environments and highlight the need to consider iceberg dive
 rsity when assessing their cumulative role in future Southern Ocean produc
 tivity and carbon cycling.
LOCATION:BAS Seminar Room 1
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