East Amazon forest understory temperatures reached a record high in 2023-2024.

ABSTRACT: The Amazon forest was struck by an El Niño event with record heat and drought during the second semester 2023, and again in 2024. However, it remains unclear whether this extreme event impacted the forest understory because long-term in situ measurements are rare. Here, we present a time series of understory air temperatures over the 2014-2024 period based on a compilation of 114 ground-based measurements in the Eastern Amazon. We found that understory temperatures increased by up to 1.6 °C in 2023-2024 relative to the 2014-2022 reference period. Understory temperatures increased by 0.04 ± 0.03 °C/yr over 2014-2024, but this increasing trend was mostly driven by the 2023-2024 extreme event. For instance, hourly distributions were significantly warmer than the reference period, reaching + 2

SUBMITTER: Hes G 

PROVIDER: S-EPMC12689650 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature