🪸 Presets

Stable reef

El Niño

Gradual warming

Recovery

Climate

Baseline SST: 27.0 °C Warming trend: 0.00 °C/yr Recovery rate: 1.0× Acidification: 0.0

Stats

Current SST—

Threshold (MMM+1)—

DHW—

Bleached—

Mortality—

Health index—

Degree Heating Weeks (DHW) sum the heat stress above the bleaching threshold (the maximum monthly mean SST + 1 °C) over a rolling 12-week window. DHW ≥ 4 → significant bleaching; DHW ≥ 8 → widespread mortality. Corals expel their zooxanthellae (symbiotic algae) under heat, turning pale then white. They recover if the water cools before tissue dies.