[DSRP Evidence](https://dsrpevidence.org/)

# A global atmospheric methane record from a tropical ice core

Lamantia et al., 2026, Nature — Climatology

Patterns: [Distinctions](https://dsrpevidence.org/pattern/distinctions), [Systems](https://dsrpevidence.org/pattern/systems), [Perspectives](https://dsrpevidence.org/pattern/perspectives)

## In short

The same global methane signal reads differently depending on where on Earth it is sampled (Pvp); reconciling a tropical vantage point with the polar record required recognizing tropical wetlands as a distinct (D) , previously underweighted part (S) of the global source budget.

## What they found (results)

A 2,000-year ice core from Nevado Huascarán (Peru) yielded the first tropical atmospheric methane record, running higher than but broadly tracking polar ice-core records, with isotopic signatures pointing to tropical wetlands (Amazon, Asia) as the dominant pre-industrial source that polar-only records had underestimated.

These researchers were not testing DSRP. The finding is theirs; the correspondence to DSRP is drawn by this site.

[Source](https://doi.org/10.1038/s41586-026-10938-1)