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SUMMARY:Simulating seaweed mCDR at regional scales
DTSTART:20260608T140000Z
DTEND:20260608T150000Z
DTSTAMP:20260615T181500Z
UID:indico-event-1110@events.geomar.de
DESCRIPTION:Speaker: Daniel Dauhajre\, UCSB (USA)\nOnline via \nhttps://g
 eomar.webex.com/geomar-en/j.php?MTID=m6f187b689fccd196c05d249d28f6d0d8\n 
 \nAbstract:The meaningful execution of marine carbon dioxide removal (mCDR
 ) via seaweed cultivation and purposeful biomass sinking requires massive 
 cultivated areas (~70\,000 - 1 million km^2).  These scales motivate the 
 development of modeling systems to quantify the viability of seaweed mCDR 
 in the safety of numerical simulation.  This talk presents the developmen
 t and initial application of online coupling a kelp growth model ([Mo]MAG)
  to the Regional Oceanic Modeling System (ROMS) and Biogeochemical Element
 al Cycling (BEC) model.  The three-way\, online coupling (ROMS-BEC-[Mo]MA
 G) simulates kelp growth in response to currents\, nutrients\, and light\,
  while simultaneously resolving kelp feedbacks on these properties: nutrie
 nt uptake\, exudation of dissolved organic matter\, production of particul
 ate organic matter\, canopy shading\, and flow damping via kelp drag.  An
  idealized simulation of an industrial scale\, suspended kelp farm reveals
  complex perturbations to upper-ocean productivity and carbon cycling\, bo
 th within the farm and ~1-40 km downstream.  The effects of kelp drag—f
 low attenuation and turbulence production—are identified as the primary 
 control on the downstream perturbations.  These perturbations include sig
 nificant impacts to the (downstream) air-sea CO2 flux.  Interestingly\, t
 he sign and spatial structure of the biogeochemical perturbations change a
 s a function of farm placement in the equilibrated ecosystem (for example\
 , inside or outside the phytoplankton bloom).  While model validation rem
 ains elusive due to a lack of measurements\, the non-local and variable im
 pacts of the kelp farm in the idealized experiment suggest difficulties fo
 r accurate measurement\, reporting\, and verification (MRV) of real-world 
 seaweed CDR. \n \n\nhttps://events.geomar.de/event/1110/
URL:https://events.geomar.de/event/1110/
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