ENSO, North Atlantic fuel hot-dry extremes on Tibetan Plateau

The Tibetan Plateau has warmed and become wetter since the 1950s, yet the region is now more vulnerable to hot‑dry extremes that combine high temperatures with drought. Scientists say that the rise in overall rainfall does not reduce the risk of these compound events, which threaten water supplies, agriculture and glacier stability.

The shift toward wetter conditions began in the early 1950s as the plateau’s average temperature climbed by roughly 0.4 °C per decade. Precipitation increased by about 2 % per decade, driven partly by changes in atmospheric circulation and the expansion of monsoon systems. However, the same warming has stretched the thermal limits of the plateau, pushing temperatures past thresholds that trigger intense heat waves even during wet periods.

Researchers attribute the growing frequency of hot‑dry events to the combined influence of the El Niño–Southern Oscillation (ENSO) and the North Atlantic Oscillation. When ENSO is in a strong El Niño phase, moisture is drawn away from the plateau, while the North Atlantic’s pressure patterns can suppress rainfall. The overlap of these drivers creates windows where temperatures soar and precipitation drops sharply, amplifying the risk of droughts despite an overall wetter trend.

The implications for the plateau’s communities and ecosystems are serious. Farmers who rely on glacial meltwater face unpredictable water availability, and the increased heat can accelerate glacier retreat, reducing long‑term water storage. Scientists warn that adaptation strategies must focus on water‑efficient agriculture and early warning systems for heat waves, rather than assuming that more rain automatically lowers drought risk.