Three of Krigsvold’s Antarctic briefings have been updated. The changes add recent evidence without discarding the observations that came before it.
Two ends of the sea-ice year
Warming and Circulation now pairs February’s relatively near-average minimum with September’s third-lowest maximum. The two figures describe different parts of the seasonal cycle, not competing verdicts on the same measurement. The new section links NASA’s October 12 account and NSIDC’s dated analysis of the early spring retreat.
Different species, different pressures
Polar Ecosystems incorporates the April IUCN assessments and the October Zavodovski research. The revision distinguishes climate-related habitat and food changes from disease, and an adopted conservation category from a proposed reassessment. The island’s contrasting penguin trajectories show why ecosystem change cannot be reduced to one population moving in one direction.
Measurements need more than instruments
Research and Response adds the NSIDC case: monthly sea-ice commentary resumed after a funding-related pause, while maps and charts had continued. Its restart announcement and programme-status page identify what returned and what remained suspended. The example makes a distinction central to Krigsvold’s infrastructure position: collecting data and making it useful require different, connected work.
The permanent briefings contain the supporting sources and limits. This note records the October 13, 2026 update; it is not a live conditions report.