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SUMMARY:Special Colloquium/open talk: Biological and physical influences o
 n Marine Snowfall at the Atlantic Equator
DTSTART:20260611T080000Z
DTEND:20260611T100000Z
DTSTAMP:20260605T230100Z
UID:indico-event-1077@events.geomar.de
CONTACT:office-fb2@geomar.de\;- 4445
DESCRIPTION:Speakers: Rainer Kiko (Plankton biogeochemistry and dynamics)\
 n\nAbstract:\nHigh primary productivity in the equatorial Atlantic Ocean i
 s one of the key features of tropical ocean biogeochemistry and fuels a su
 bstantial flux of particulate matter towards the abyssal ocean. Since 2012
  we use shipboard\, moored and float-based high-resolution size-resolved p
 article imaging in combination with physical and biogeochemical measuremen
 t approaches to assess the impacts of physical forcing on primary producti
 vity\, food web dynamics and particle export across and along the Atlantic
  equator. We could show how seasonal upwelling and frontal dynamics\, but 
 also the positioning of the Equatorial Undercurrent in relation to the nit
 racline are related to upper ocean primary productivity and particle expor
 t. Advection of particulate matter from the South American coastal area to
 wards the central Atlantic during a time of low upwelling activity in Apri
 l/May 2022 seems to be an important aspect of equatorial particle dynamics
  as well. Contrary to earlier sediment trap observations\, our work also i
 ndicates that particle flux does not decrease monotonously with depth (Mar
 tin-curve assumption)\, but increases at the daytime depth of Zooplankton 
 Diel Vertical Migrations at mesopelagic depth\, likely related to Zooplank
 ton fecal pellet release and mortality. Our observations also enable us to
  better understand how epi- and mesopelagic dynamics lead to the modulatio
 n of the marine equatorial snowfall even at bathypelagic depth\, along and
  across the equator and throughout the year.\n\nhttps://events.geomar.de/e
 vent/1077/
LOCATION:5-1.213 - PAZIFIK / PACIFIC- Rechte Seite - Großer\, unterteilba
 rer Konferenzraum (GEOMAR - Standort Ostufer  / GEOMAR - East Shore)
URL:https://events.geomar.de/event/1077/
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