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SUMMARY:What are the challenges simulating historical ocean deoxygenation?
  - Yohei Takano\, British Antarctic Survey
DTSTART:20240403T130000Z
DTEND:20240403T140000Z
UID:TALK212389@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Global warming is causing a decrease in the amount of dissolve
 d oxygen (o2) in the ocean\, \nwhich is a major issue for marine ecosystem
  and sea life. However\, we face challenges in \naccurately predicting the
 se changes in o2 levels using our current models. In this presentation\, \
 nI will talk about the uncertainties and missing pieces in our ocean bioge
 ochemistry simulations. \nSpecifically\, I will look at the latest models 
 that simulates how the o2 and temperature have changed \nover the past 50 
 years. I will closely look at o2 and heat in the top 700 meters of the oce
 an\, \nusing models from the Coupled Model Intercomparison Project Phase 6
  (CMIP6). I will compare changes \nin o2 levels and ocean heat content (OH
 C) to show how the ocean's physical and biogeochemical response \nto clima
 te change differ. These comparisons use forced ocean-only models (from the
  Ocean Model Intercomparison \nProject phases 1 and 2\, or OMIP1 and OMIP2
 ) and coupled climate models (from CMIP6's historical simulations). \nThe 
 models show different trends in o2 and OHC over the past five decades.  A 
 closer look at the OMIP1 and OMIP2 \nmodels suggests that different atmosp
 heric forcing such as surface wind could explain why these models \nsimula
 te different changes. Furthermore\, comparing OMIP models with CMIP6 histo
 rical models reveals \nthat differences in the background mean state of th
 e models\, due to how they were initially set up and spun-up\, \nlead to s
 ignificant differences in how they simulate o2 levels will change due to c
 limate change. Finally\, \nI will discuss how future studies could improve
  our understanding of ocean deoxygenation and biogeochemistry \nchanges by
  using coordinated simulation efforts. This could help us figure out what 
 controls changes in o2 levels \nand other related aspects of the ocean bio
 geochemical cycles.
LOCATION:BAS Seminar Room 1\; zoom
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