EGU2020-3352
https://doi.org/10.5194/egusphere-egu2020-3352
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Interactions between ocean heat transport and Arctic sea ice

David Docquier, Ramon Fuentes-Franco, Klaus Wyser, and Torben Koenigk
David Docquier et al.
  • Rossby Centre, Swedish Meteorological and Hydrological Institute, Norrköping, Sweden (david.docquier@smhi.se)

Arctic sea ice has been retreating at fast pace in the last decades, with potential impacts on the weather and climate at mid and high latitudes, as well as the biosphere and society. Sea-ice loss is driven by anthropogenic global warming, atmospheric circulation changes, climate feedbacks, and ocean heat transport. To date, no clear consensus regarding the detailed impact of ocean heat transport on Arctic sea ice exists. Previous observational and modeling studies show that the poleward Atlantic Ocean heat transport and Arctic sea-ice area and volume are generally anti-correlated, suggesting a decrease in sea-ice area and volume with larger ocean heat transport. In turn, the changing sea ice may also affect ocean heat transport, but this effect has been much less studied. Our study explores the two-way interactions between ocean heat transport and Arctic sea ice. We use the EC-Earth global climate model, coupling the atmosphere and ocean, and perform different sensitivity experiments to gain insights into these interactions. The mechanisms by which ocean heat transport and Arctic sea ice interact are analyzed, and compared to observations. This study provides a way to better constrain model projections of Arctic sea ice, based on the relationships between ocean heat transport and Arctic sea ice.

How to cite: Docquier, D., Fuentes-Franco, R., Wyser, K., and Koenigk, T.: Interactions between ocean heat transport and Arctic sea ice, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3352, https://doi.org/10.5194/egusphere-egu2020-3352, 2020

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Display material version 4 – uploaded on 02 May 2020
Paper accepted slide 4.
  • CC1: Comment on EGU2020-3352, Yue Wu, 08 May 2020

    Hi David, That's really nice work! As response I compared your work (both EGU and GitLab) with mine, yes you're right there's similarity in mixed layer depth in response to ocean warming, as well as SST.

    In your study, you set three domains for extra OHT input and three specific extent of temperature increase (in total 9 scenarios for Atlantic side), in order to look at how the ocean and sea ice respond to these forcing. So it's a model sensitivity study, but as well as an investigation on relationship between OHT and Arctic sea ice. Do I get your ideas correct? 

    I found your ATL2 + 1C (not shown in slides, which I suppose is SST + 1C middle left in Fig.7-9 at GitLab) is the closest to my results. Based on the ensemble experiment I use is a long time hindcast plus a short time forcast, I would guess in this case, the ocean is more experiencing a 1-2C increase in ocean with extra OHT mainly is in the Northern North Atlantic. 

    While I'm still curious about how you would have some ideas on this.

    (a) Which scenario do you think is the closest to real ocean?

    (b) Following (a), as well known, heat transport to Arctic is mainly come from Atlantic side from low latitude. I see your domains mainly sit close to Arctic strait, just wondering would it be a slightly different result if the domain is moved a bit southward, say North Atlantic but exclusive Northern North Atlantic? 

    These are my ideas but if there's anything I was wrong please correct me. 

     

    Very interesting work! learnt a lot! 

    Best, Yue 

  • AC1: Comment on EGU2020-3352, David Docquier, 08 May 2020

    Hi Yue,

    Thanks a lot for your feedback related to my work, really appreciated. Here are my replies to your questions.

    Yue: In your study, you set three domains for extra OHT input and three specific extent of temperature increase (in total 9 scenarios for Atlantic side), in order to look at how the ocean and sea ice respond to these forcing. So it's a model sensitivity study, but as well as an investigation on relationship between OHT and Arctic sea ice. Do I get your ideas correct? 

    Yes, you're right: these are sensitivity experiments that aim at looking at the impact of changes in OHT on Arctic sea ice. The way I found to enhance the OHT was to increase the SST in selected domains. In fact, I have 18 experiments in total because I also have 3 different domains in the North Pacific (see Slide 6).

    Yue: I found your ATL2 + 1C (not shown in slides, which I suppose is SST + 1C middle left in Fig.7-9 at GitLab) is the closest to my results. Based on the ensemble experiment I use is a long time hindcast plus a short time forcast, I would guess in this case, the ocean is more experiencing a 1-2C increase in ocean with extra OHT mainly is in the Northern North Atlantic. 

    Yes, ATL2+1K is the middle left panel of these 3 figures. As you say, this is probably the closest experiment to your results. But as you can see in Fig. 8, all ATL1 and ATL2 experiments show in fact a similar pattern, with MLD deepening north of Iceland and shallowing south of Svalbard. I haven't looked at the MLD of the PAC experiments, but I guess it would show some kind of similar pattern because there is also large sea-ice concentration reduction in the GIN and Barents Seas in these experiments.

    Yue: (a) Which scenario do you think is the closest to real ocean?

    I don't really understand your question, sorry.

    Yue: (b) Following (a), as well known, heat transport to Arctic is mainly come from Atlantic side from low latitude. I see your domains mainly sit close to Arctic strait, just wondering would it be a slightly different result if the domain is moved a bit southward, say North Atlantic but exclusive Northern North Atlantic? 

    That's a very good question and, unfortunately, I can't really answer because all my domains are connected to the Arctic as you mention. I wanted to increase the heat in a domain close to the Arctic straits. But I guess that increasing the OHT in a more southern part would also provide such sea-ice loss, but with lower magnitude. That's a good idea for experiment by the way, thanks ;).

    All the best and keep in touch,

    David

     

    • CC2: Reply to AC1, Yue Wu, 08 May 2020

      Thank you David for replying so much. 

      For question (a), I think you've answered me when we discussed ATL1&2 + 1C experiments. But it's good to have a look at what's going on in PAC experiments. 

      For question (b), it's me just have a flash curiosity but what you have done can tell the story very well. 


      Hope we would meet in person at occasions in the future. 

      Yue

Display material version 3 – uploaded on 29 Apr 2020, no comments
Correction Fig. slide 9 and improvement of Fig. slide 13.
Display material version 2 – uploaded on 28 Apr 2020, no comments
I have updated the figures and part of the text.
Display material version 1 – uploaded on 17 Apr 2020, no comments