- The grounding line, where the glaciers become floating ice shelves, is receding as much as 600 feet per year, bolstering fears of a worst-case Antarctic meltdown scenario, with global sea level rising 10 feet by 2100.
- Eight of the frozen continent’s 65 major ice streams had retreated by more than 410 feet per year—five times the average rate of retreat since the end of the last ice age. The grounding line of some of the glaciers emptying into the Amundsen Sea had retreated by up to 600 feet per year.
Manoochehr Shirzaei and Roland Bürgmann. Global climate change and local land subsidence exacerbate inundation risk to the San Francisco Bay Area. Science Advances 07 Mar 2018: Vol. 4, no. 3, eaap9234 DOI: 10.1126/sciadv.aap9234
Abstract: The current global projections of future sea level rise are the basis for developing inundation hazard maps. However, contributions from spatially variable coastal subsidence have generally not been considered in these projections. We use synthetic aperture radar interferometric measurements and global navigation satellite system data to show subsidence rates of less than 2 mm/year along most of the coastal areas along San Francisco Bay. However, rates exceed 10 mm/year in some areas underlain by compacting artificial landfill and Holocene mud deposits. The maps estimating 100-year inundation hazards solely based on the projection of sea level rise from various emission scenarios underestimate the area at risk of flooding by 3.7 to 90.9%, compared with revised maps that account for the contribution of local land subsidence. Given ongoing land subsidence, we project that an area of 125 to 429 km2 will be vulnerable to inundation, as opposed to 51 to 413 km2 considering sea level rise alone.