Anthropogenic Fingerprint Detectable in Upper Tropospheric Ozone Trends Retrieved from Satellite.

ABSTRACT: Tropospheric ozone (O₃) is a strong greenhouse gas, particularly in the upper troposphere (UT). Limited observations point to a continuous increase in UT O₃ in recent decades, but the attribution of UT O₃ changes is complicated by large internal climate variability. We show that the anthropogenic signal ("fingerprint") in the patterns of UT O₃ increases is distinguishable from the background noise of internal variability. The time-invariant fingerprint of human-caused UT O₃ changes is derived from a 16-member initial-condition ensemble performed with a chemistry-climate model (CESM2-WACCM6). The fingerprint is largest between 30°S and 40°N, especially near 30°N. In contrast, the noise pattern in UT O₃ is mainly associated wi

SUBMITTER: Yu X 

PROVIDER: S-EPMC11325641 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature