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SUMMARY:Macroalgae Cultivation for Ocean CDR: An Idealized Numerical Study
  - Si Chen\, DAMTP
DTSTART:20230206T130000Z
DTEND:20230206T140000Z
UID:TALK196054@talks.cam.ac.uk
CONTACT:Prof. John R. Taylor
DESCRIPTION:The cultivation of macroalgae in offshore waters has been prop
 osed as an ocean-based carbon dioxide removal strategy to mitigate the adv
 erse impacts of climate change. However\, many uncertainties about this st
 rategy remain\, including the possible impact on microalgal primary produc
 tion\, the influence on carbonate chemistry\, timescales involved in the a
 ir-sea CO2 flux\, and the efficiency of macroalgal carbon export to the de
 ep ocean. Here\, we couple a kelp growth model with a biogeochemical model
  and conduct idealized numerical experiments to address some of these ques
 tions.\n\nSpecifically\, we use an intermediate complexity ocean biogeoche
 mical model (LOBSTER) to simulate primary production and biogeochemical in
 teractions among nitrate (NO3)\, ammonium (NH4)\, phytoplankton (P)\, zoop
 lankton (Z)\, small detritus (D)\, large detritus (DD)\, and dissolved org
 anic matter (DOM)\, plus dissolved inorganic carbon (DIC) and alkalinity (
 ALK). The model is forced with an idealized seasonal cycle of temperature\
 , mixed layer depth\, salinity\, and photosynthetic available radiation da
 ta\, and the result is compared with the Mercator Global Ocean Biogeochemi
 stry Analysis and Forecast data.\n\nThe biogeochemical model is then coupl
 ed with a model of kelp growth which is a function of environmental variab
 les including the surrounding water temperature\, nutrient content\, and c
 urrent speed. The coupled model enables the identification of the impacts 
 of kelp on biogeochemical cycles\, natural primary production\, carbon exp
 ort\, and air-sea CO2 flux\, evaluating kelp as a potential carbon dioxide
  removal strategy. By varying kelp concentration and geographic locations\
 , for example\, we can answer questions as to how and where kelp can be de
 ployed to maximize kelp growth and carbon sequestration while minimizing h
 armful impacts.\n
LOCATION:MR5\, CMS
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