#kk-cryosphere

Models find few links between sea ice loss and weakened jet stream

An observationally calibrated ice sheet–shelf model suggests that global warming of 3 °C will trigger rapid Antarctic ice loss, contributing about 0.5 cm per year of sea-level rise by 2100.

Why is sea level rise so hard? Data, modeling and projection challenges still exist even while we make incremental progress.

A warming atmosphere is causing a branch of the ocean’s powerful Gulf Stream to weaken, some scientists fear.

Recent assessments from the Intergovernmental Panel on Climate Change (IPCC) imply that global mean sea level is unlikely to rise more than about 1.1 m within this century but will increase further beyond 2100. Even within the most intensive future anthropogenic greenhouse gas emission scenarios, higher levels are assessed to be unlikely. However, some studies conclude that considerably greater sea level rise could be realized, and a number of experts assign a substantially higher likelihood of such a future. To understand this discrepancy, it would be useful to have scenario-independent metrics that can be compared between different approaches. The concept of a transient climate sensitivity has proven to be useful to compare the global mean temperature response of climate models to specific radiative forcing scenarios. Here, we introduce a similar metric for sea level response. By analyzing the mean rate of change in sea level (not sea level itself), we identify a nearly linear relationship with global mean surface temperature (and therefore accumulated carbon dioxide emissions) both in model projections and in observations on a century scale. This motivates us to define the “transient sea level sensitivity” as the increase in the sea level rate associated with a given warming in units of meters per century per kelvin. We find that future projections estimated on climate model responses fall below extrapolation based on recent observational records. This comparison suggests that the likely upper level of sea level projections in recent IPCC reports would be too low.

The Last Ice tells the story of the Inuit communities fighting to protect the disappearing Arctic.

Isen på Grønland reflekterer rekord-lidt sollys på grund af forurening og alger, der trives i det varmere klima. Og det sætter gang i en ond spiral.

Over the past decade Ireland has endured some extreme weather conditions from summer heatwaves to cold spells of snow and ice chaos. There's an argument that these events are influenced by what's happening with the Greenland Ice Sheet (2018)