By P Gosselin
4 new research in prestigious journals present Antarctic ice shelf as secure as ever.
Hat-tip: EIKE Klimaschau
Andreasen et al (2023) finds web acquire
A examine by Julia R. Andreasen and colleagues appeared on the modifications in ice cabinets, Antarctic-wide, utilizing MODIS (Average Decision Imaging Spectroradiometer) satellite tv for pc information from 2009 to 2019.
Picture: Andreasen et al (2023)
They discovered that over the interval 2009-2019, total Antarctic ice shelf space grew by 5305 km2.
18 ice cabinets retreated considerably and 16 bigger cabinets grew by way of space. “Our observations present that Antarctic ice cabinets gained 661 Gt of ice mass over the previous decade,” the scientists summarized.
Banwell et al (2023) meltwater quantity dropped
One other new paper by Banwell et al revealed within the journal Geophysical Analysis Letters appeared on the length and quantity of floor ice melting on Antarctica’s ice cabinets from 1980 to 2021, utilizing microwave satellite tv for pc information the snow mannequin SNOWPACK.
Outcome: They discovered that the best meltwater volumes had been produced on the Peninsula, reaching a peak within the 1992/1993 and 1994/1995, and that SNOWPACK calculated “a small, however vital, lowering development in each annual soften days and meltwater manufacturing quantity over the 41 years.”
Frazer et al (2023)
One other examine revealed in Nature authored by Frazer et al (2023) discovered that though West Antarctica – notably from Pine Island and Thwaites glaciers – has seen dramatic ice losses in latest a long time, projections of their future charge are confounded by restricted observations.
Additionally, wanting on the interval 2003 and 2015, they discovered charges of glacier retreat and acceleration to be intensive alongside the Bellingshausen Sea shoreline, however slowed alongside the Amundsen Sea.
The authors conclude: Our outcomes present direct observations that the tempo, magnitude and extent of ice destabilization round West Antarctica range by location, with the Amundsen Sea response most delicate to interdecadal atmosphere-ocean variability.
Baico et al (2023) 35 meters thinner hundreds of years in the past
Lastly, in yet one more new revealed paper by Baico et al (2023), the authors checked out subglacial bedrock cores present that the West Antarctic Ice Sheet (WAIS) between Thwaites and Pope glaciers and located it “was at the very least 35 m thinner than current previously a number of thousand years after which subsequently thickened.”
Furthermore: “A previous episode of ice sheet thinning that occurred in an identical, though not equivalent, local weather was not irreversible. We suggest that the previous thinning–thickening cycle was on account of a glacioisostatic rebound suggestions, much like that invoked as a attainable stabilizing mechanism for present grounding line retreat, during which isostatic uplift brought on by Early Holocene thinning led to relative sea stage fall favoring grounding line advance.”
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