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What are the challenges simulating historical ocean deoxygenation?

Global warming is causing a decrease in the amount of dissolved oxygen (o2) in the ocean, which is a major issue for marine ecosystem and sea life. However, we face challenges in accurately predicting these changes in o2 levels using our current models. In this presentation, I will talk about the uncertainties and missing pieces in our ocean biogeochemistry simulations. Specifically, I will look at the latest models that simulates how the o2 and temperature have changed over the past 50 years. I will closely look at o2 and heat in the top 700 meters of the ocean, using models from the Coupled Model Intercomparison Project Phase 6 (CMIP6). I will compare changes in o2 levels and ocean heat content (OHC) to show how the ocean’s physical and biogeochemical response to climate change differ. These comparisons use forced ocean-only models (from the Ocean Model Intercomparison Project phases 1 and 2, or OMIP1 and OMIP2 ) and coupled climate models (from CMIP6 ’s historical simulations). The models show different trends in o2 and OHC over the past five decades. A closer look at the OMIP1 and OMIP2 models suggests that different atmospheric forcing such as surface wind could explain why these models simulate different changes. Furthermore, comparing OMIP models with CMIP6 historical models reveals that differences in the background mean state of the models, due to how they were initially set up and spun-up, lead to significant differences in how they simulate o2 levels will change due to climate change. Finally, I will discuss how future studies could improve our understanding of ocean deoxygenation and biogeochemistry changes by using coordinated simulation efforts. This could help us figure out what controls changes in o2 levels and other related aspects of the ocean biogeochemical cycles.

• Speaker: Yohei Takano, British Antarctic Survey
• Wednesday 03 April 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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What are the challenges simulating historical ocean deoxygenation?

Global warming is causing a decrease in the amount of dissolved oxygen (o2) in the ocean, which is a major issue for marine ecosystem and sea life. However, we face challenges in accurately predicting these changes in o2 levels using our current models. In this presentation, I will talk about the uncertainties and missing pieces in our ocean biogeochemistry simulations. Specifically, I will look at the latest models that simulates how the o2 and temperature have changed over the past 50 years. I will closely look at o2 and heat in the top 700 meters of the ocean, using models from the Coupled Model Intercomparison Project Phase 6 (CMIP6). I will compare changes in o2 levels and ocean heat content (OHC) to show how the ocean’s physical and biogeochemical response to climate change differ. These comparisons use forced ocean-only models (from the Ocean Model Intercomparison Project phases 1 and 2, or OMIP1 and OMIP2 ) and coupled climate models (from CMIP6 ’s historical simulations). The models show different trends in o2 and OHC over the past five decades. A closer look at the OMIP1 and OMIP2 models suggests that different atmospheric forcing such as surface wind could explain why these models simulate different changes. Furthermore, comparing OMIP models with CMIP6 historical models reveals that differences in the background mean state of the models, due to how they were initially set up and spun-up, lead to significant differences in how they simulate o2 levels will change due to climate change. Finally, I will discuss how future studies could improve our understanding of ocean deoxygenation and biogeochemistry changes by using coordinated simulation efforts. This could help us figure out what controls changes in o2 levels and other related aspects of the ocean biogeochemical cycles.

• Speaker: Yohei Takano, British Antarctic Survey
• Wednesday 03 April 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Effective use of genomic identification could revolutionize the control of the illegal timber trade. Melanie Zacharias, Postdoctoral researcher in forest genetics, Université Laval Licensed as Creative Commons – attribution, no derivatives.

From sacrificial bark to fire-germinating gumnuts to stealthy buds the eucalyptus has evolved an arsenal of protective measures. Gregory Moore, Senior Research Associate, School of Ecosystem and Forest Sciences, The University of Melbourne Licensed as Creative Commons – attribution, no derivatives.

We’ve brought some species back from the brink – but more and more are being threatened. Here’s why Frédérik Saltré, Research Fellow in Ecology for the ARC Centre of Excellence for Australian Biodiversity and Heritage, Flinders University Corey J. A. Bradshaw, Matthew Flinders Professor of Global Ecology and Models Theme Leader for the ARC Centre of Excellence for Australian Biodiversity and Heritage, Flinders University Licensed as Creative Commons – attribution, no derivatives.

The ‘20°C effect’ could give us new insights into how temperature controls ecosystems and influences evolution – as well as how species might adapt to climate change. Mark John Costello, Professor, Faculty of Biosciences and Aquaculture, Nord University Ross Corkrey, Adjunct Senior Researcher in Biostatistics, University of Tasmania Licensed as Creative Commons – attribution, no derivatives.

Recent research shows how reducing overfishing is both an ecological imperative and a critical means to addressing climate change. Rashid Sumaila, Director & Professor, Fisheries Economics Research Unit, University of British Columbia Licensed as Creative Commons – attribution, no derivatives.

England’s new ‘biodiversity net gain’ policy is ambitious, but researchers have identified flaws and loopholes. Natalie Duffus, PhD Candidate, Conservation Policy, University of Oxford Sophus zu Ermgassen, Postdoctoral Researcher, University of Oxford Licensed as Creative Commons – attribution, no derivatives.

Title to be confirmed

Abstract not available

• Speaker: Hidetaka Kobayashi, University of Toyama
• Wednesday 24 April 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Hidetaka Kobayashi, University of Toyama
• Wednesday 24 April 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Hidetaka Kobayashi, University of Toyama
• Wednesday 24 April 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Carlos Moffat, University of Delaware
• Wednesday 15 May 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Abstract not available

• Speaker: Carlos Moffat, University of Delaware
• Wednesday 15 May 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Carlos Moffat, University of Delaware
• Wednesday 15 May 2024, 14:00-15:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Abstract not available

• Speaker: Juliana Marson, University of Manitoba
• Wednesday 01 May 2024, 15:00-16:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Juliana Marson, University of Manitoba
• Wednesday 01 May 2024, 15:00-16:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Title to be confirmed

Abstract not available

• Speaker: Juliana Marson, University of Manitoba
• Wednesday 01 May 2024, 15:00-16:00
• Venue: BAS Seminar Room 1; zoom.
• Series: British Antarctic Survey - Polar Oceans seminar series; organiser: Dr Birgit Rogalla.

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Australia has already lost so many wonderful mammal species. Do we want the southern greater glider to suffer the same fate? David Lindenmayer, Professor, The Fenner School of Environment and Society, Australian National University Kita Ashman, Adjunct research associate, Charles Sturt University Licensed as Creative Commons – attribution, no derivatives.

Integrating local and Indigenous knowledge into conservation can help to support diverse diets without compromising biodiversity goals. Terry Sunderland, Professor in the Faculty of Forestry, University of British Columbia Licensed as Creative Commons – attribution, no derivatives.

Survey respondents overwhelmingly prioritised saving a human life – even if that person had been repeatedly told to evacuate and even if, as a consequence, a snail or shrub species became extinct. John Woinarski, Professor of Conservation Biology, Charles Darwin University Kerstin Zander, Professor of Environmental Economics, Charles Darwin University Stephen Garnett, Professor of Conservation and Sustainable Livelihoods, Charles Darwin University Licensed as Creative Commons – attribution, no derivatives.