Janni Yuval
@janniyuval.bsky.social
Climate scientist. Building hybrid climate models at Google research.
@rahmstorf.bsky.social - at the time of our previous paper that showed that the Hadley cell has weakened in recent decades (www.nature.com/articles/s41...) you asked me what implication does it have for precipitation. This is what we found.
Human-induced weakening of the Northern Hemisphere tropical circulation - Nature
Analysis of sea-level pressure measurements shows that, in agreement with the latest suite of climate models, the Hadley circulation has considerably weakened in the Northern Hemisphere over recent de...
www.nature.com
April 30, 2025 at 5:40 PM
@rahmstorf.bsky.social - at the time of our previous paper that showed that the Hadley cell has weakened in recent decades (www.nature.com/articles/s41...) you asked me what implication does it have for precipitation. This is what we found.
6/ Our work offers a more refined prediction for subtropical precipitation changes by better constraining Hadley Cell weakening.
April 30, 2025 at 5:24 PM
6/ Our work offers a more refined prediction for subtropical precipitation changes by better constraining Hadley Cell weakening.
5) We show that the constraint work where the Hadley cell is more active - over Asia, Africa, & the Pacific.
April 30, 2025 at 5:24 PM
5) We show that the constraint work where the Hadley cell is more active - over Asia, Africa, & the Pacific.
4/ How we applied it: 1. We linked observable sea-level pressure changes to Hadley Cell strength. 2. Then, we related this constrained Hadley Cell weakening to projected increases in subtropical precipitation using the moisture budget.
April 30, 2025 at 5:24 PM
4/ How we applied it: 1. We linked observable sea-level pressure changes to Hadley Cell strength. 2. Then, we related this constrained Hadley Cell weakening to projected increases in subtropical precipitation using the moisture budget.
3/ We used an 'emergent constraint' approach. This means we find relationships in climate models between an observable current climate feature (predictor) and a future climate projection (predictand). This helps refine future projections.
April 30, 2025 at 5:24 PM
3/ We used an 'emergent constraint' approach. This means we find relationships in climate models between an observable current climate feature (predictor) and a future climate projection (predictand). This helps refine future projections.
2/ Why is this important? Predicting future precipitation changes is tough, largely due to uncertainties in how atmospheric circulation will evolve. The Hadley Cell is a key player in tropical circulation, influencing rainfall patterns.
April 30, 2025 at 5:24 PM
2/ Why is this important? Predicting future precipitation changes is tough, largely due to uncertainties in how atmospheric circulation will evolve. The Hadley Cell is a key player in tropical circulation, influencing rainfall patterns.