Temperature-dependent composition of summertime PM_2.5 in observations and model predictions across the Eastern U.S.

ABSTRACT: Throughout the U.S., summertime fine particulate matter (PM_2.5) exhibits a strong temperature (T) dependence. Reducing the PM_2.5 enhancement with T could reduce the public health burden of PM_2.5 now and in a warmer future. Atmospheric models are a critical tool for probing the processes and components driving observed behaviors. In this work, we describe how observed and modeled aerosol abundance and composition varies with T in the present-day Eastern U.S. with specific attention to the two major PM_2.5 components: sulfate (SO₄ ^2-) and organic carbon (OC). Observations in the Eastern U.S. show an average measured summertime PM_2.5-T sensitivity of 0.67 μg/m³/K, with CMAQ v5.4 regional model predictions c

SUBMITTER: Vannucci PF 

PROVIDER: S-EPMC11492923 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature