Heat waves may trigger unexpected surge in aerosol and ozone precursor emissions from sedges in urban landscapes.

ABSTRACT: Biogenic isoprene emissions from herbaceous plants are generally lower than those from trees. However, our study finds widespread isoprene emission in herbaceous sedge plants, with a stronger temperature response surpassing current tree-derived models. We measured and compared isoprene emissions from sedges grown in different climatic zones, all showing an exponential temperature response with a Q10 range of 7.2 to 12, significantly higher than the Q10 of about 3 for other common isoprene emitters. The distinct temperature sensitivity of sedges makes them a hidden isoprene source, significant during heat waves but not easily detected in mild weather. For instance, isoprene emissions from Carex praegracilis can increase by 320% with a peak emission of over 100 nmol m^-2 s

SUBMITTER: Wang H 

PROVIDER: S-EPMC11551377 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature