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SUMMARY:The compounding impacts of Sea-Ice Deficits: A Global Perspective 
 - Petra Heil\, Australian Antarctic Division / University of Tasmania
DTSTART:20250107T110000Z
DTEND:20250107T120000Z
UID:TALK225403@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Sea ice plays a crucial role in the global Earth system\, inc
 luding regulation of temperatures\, ocean-atmosphere exchange and ocean ci
 rculation. In the recent decades we have witnessed significant declines in
  Arctic and Antarctic sea ice including its thickness\, albeit with stark
  hemispheric differences. These changes have far-reaching consequences for
  marine ecosystems\, atmospheric circulation patterns\, and global climate
 . I will discuss insights on Antarctic sea ice with focus on multifaceted 
 impacts of sea-ice deficits\, examining how these changes are interconnect
 ed. The complexity of sea-ice processes across scales and global pathways 
 result in compounding effects of changing sea ice across the planet. Polar
  amplification intensifies the feedback loop between sea ice and the atmos
 phere\, influencing atmospheric circulation patterns\, with initial eviden
 ce to lead to more frequent and intense extreme weather events. This warmi
 ng is also associated with the marine polar albedo feedback loop\, prefere
 ntially concentrating ocean warming to the polar latitudes. The erosion of
  the Southern Ocean sea ice\, partially driven by increased energy in the 
 lower atmosphere\, has been detrimental to the seasonal duration of sea ic
 e including near coastal sea ice\, and compounding in glacial melt and ice
 -shelf instability. A cascading effect of reduced sea-ice formation direct
 ly modifies the ocean signature impacting water-mass formation\, ocean cir
 culation as well as oceanic heat transport and nutrient distribution with 
 global reach. Reduced and thinner sea ice also presents a habitat loss thr
 eatening marine biodiversity. The wider scientific community has provided 
 a wealth of knowledge on sea ice and its role in the Earth system. However
 \, the improved understanding highlights the complexity of polar processes
  and identifies further knowledge gaps\, as well as how scientific informa
 tion is used to better assess the risks associated with sea-ice decline an
 d to identify (near-) immediate tangible mitigation strategies. To conclud
 e I will provide an outlook to upcoming international and cross-disciplina
 ry initiatives\; considerations around methods and inclusivity\; and the 
 need to co-design these with view on societal pressures to ensure maximum 
 impact and information uptake in policy decisions.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/93901016357
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