COLD · Valores extremos
Extreme cold
GEV sobre t2m invertida de ERA5 + reducción de escala por gradiente altitudinal · v1.1.1 · 2026-07
Rusia / Mongolia / China — del extremo siberiano a la estepa más templada
La temperatura mínima extrema a 100 años, a partir de 30 años de reanálisis climático ERA5, con reducción de escala a 90 m.
Qué incluye
Surfaces + Returns — puntuación de 0 a 1 derivada de la Tmin a 100 años, más la Tmin mínima anual por período de retorno (rp5/10/25/50/100, °C). Línea de costa a resolución completa (GSHHG-f): las islas barrera ya reciben puntuación.
Cada versión: puntuación de 0 a 1 · banda de 5 clases · incertidumbre por píxel · máscara de cobertura de entradas · elemento STAC · documento de metodología.
Entradas
Temperatura mínima mensual de ERA5, 1991–2020, DEM
Historial de versiones
Qué cambió entre versiones: las mismas notas que se publican con los datos. De más reciente a más antigua.
Surfaces
v1.1.1
2026-07
actual
- Full-resolution coastline (GSHHG-f). All four layers are re-clipped against the canonical GSHHG-f shoreline (~100 m native), so barrier islands and narrow coastal strips that previously read as NoData now carry a score. Any query over real land returns a result.
- Model unchanged. Susceptibility, classification, uncertainty, and coverage values are identical to v1.1 (differences are coastline-only); this vintage is a land-mask refresh, not a model revision.
- Product footprint is 84°N–70°S; Antarctica (below −70°) excluded by standard.
v1.1
2026-04
- Compact uint16 encoding. The surfaces were re-encoded from float32 to compact integer COGs with a documented scale (physical = raw × scale, nodata 65535) — smaller and self-describing, with no loss of precision at the delivered resolution. Method and values are unchanged from v1.0.
v1.0
2026-04
- Initial release. Susceptibility derived from a Generalized Extreme Value (GEV) fit to 30 years of ERA5 monthly minimum temperature (mn2t, 1991–2020). The 100-year return-period Tmin is inverted (a colder extreme is a higher hazard) and ranked to a 0–1 percentile scale, with a five-class map (Very Low tropical → Very High polar / deep-continental), plus per-pixel uncertainty and coverage.
- Elevation-lapse downscale to 90 m. The coarse ERA5 field is corrected with a standard −6.5 °C/km lapse rate against the DEM, resolving the colder extremes of higher terrain that the native grid averages away.
Returns
v1.0
2026-07
actual
- Initial release. Per-return-period annual-minimum daily temperature (Tmin) from a per-cell generalized extreme value (GEV) fit to 30 years of ERA5 (1991–2020) annual-minimum 2 m temperature (mn2t), at the 5-, 10-, 25-, 50-, and 100-year return periods. Because these are minima, a longer return period is a colder value — rp100 is the coldest 1-in-100-year night.
- Physical °C on one shared scale + offset. Values are daily-min air temperature in °C; because cold return levels are strongly negative (below −60 °C in Siberia and Greenland), the uint16 encoding carries both a SCALE and an OFFSET, shared across all five return periods, so raw * scale + offset yields °C with no clipping of the negative tail.
- Elevation-lapse downscale. The 0.25° return levels are brought to 90 m by adjusting to the terrain height with an environmental lapse rate.
- GSHHG-f canonical land mask (~100 m native): every real coast returns a value; ocean and Antarctica are NoData.
- Same fit as Extreme Cold Surfaces. The 100-year Tmin here is exactly the field the Extreme Cold Surfaces line normalizes (inverted, colder → higher) into its 0–1 susceptibility score.
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