80 Scientists Sound Alarm
Blind spots at Antarctic coasts threaten accuracy of global sea-level rise predictions, leaving a 1-meter uncertainty gap.
A new review published in the journal Reviews of Geophysics has highlighted the limitations of current sea level projections due to blind spots at Antarctic coasts. The review, contributed to by 80 scientists from 16 countries, emphasizes the need for improved observations at a pan-Antarctic scale to make reliable predictions about the future of the Antarctic ice sheet and global sea-level rise.
The Antarctic coastal zone is a complex system where ice from the ice sheet extends over the seabed, initially resting on it and farther out floating as ice shelves. However, key coastal conditions remain poorly mapped, with persistent gaps in direct observations of coastal bed topography and sub-ice-shelf cavities. These gaps are crucial for making reliable predictions about the future of the Antarctic ice sheet and the consequences for the climate and global sea-level rise.
The review was coordinated through the Scientific Committee on Antarctic Research (SCAR) RINGS Action Group, which is endorsed by the Council of Managers of National Antarctic Programs (COMNAP). The RINGS Action Group provides logistics knowledge for efficient survey planning and better coordinates support provided by national Antarctic programs. The review synthesized the current understanding of how ice, ocean, atmosphere and solid earth interact in Antarctica's coastal zone by combining existing observations, models and theory.
Satellite observations provide powerful measurements of ice motion and surface change, but cannot observe the bedrock under ice from space. Ice sheet models are highly sensitive to conditions at the coast, and even advanced models can produce misleading results when data are missing or poorly constrained. Incomplete data continue to limit estimates of Antarctic ice loss and future sea-level rise.
## Why it matters The limitations of current sea level projections have significant implications for our understanding of the impacts of climate change. The Antarctic ice sheet is a major contributor to global sea-level rise, and accurate predictions of its future behavior are essential for planning and mitigation efforts. The review highlights the need for improved observations and modeling to reduce the uncertainty associated with sea level projections and to provide more reliable predictions for the future.
The international community is working together to address the knowledge gaps and limitations highlighted in the review. The Scientific Committee on Antarctic Research (SCAR) and the Council of Managers of National Antarctic Programs (COMNAP) are playing key roles in coordinating research efforts and providing logistics support for survey planning and data collection. By working together, scientists and policymakers can reduce the uncertainty associated with sea level projections and provide more reliable predictions for the future.
