Details:

Journal Title:
Journal of Geophysical Research: Atmospheres
Personal Author:
Wang, Yi ; Wang, Jun ; Wang, Yuxuan ; Li, Wei
Wang, Yi ; Wang, Jun ; Wang, Yuxuan ; Li, Wei Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
This study uses PM2.5 species concentrations from Interagency Monitoring of Protected Visual Environments and Standardized Precipitation Evapotranspiration Index (SPEI) during 1988–2018 over the continental US to investigate the association of spatial‐temporal variations of surface PM2.5 species with droughts. Ubiquitous decreasing trends in seasonal mean reconstructed PM2.5 are detected in all seasons except for the summer over the northwestern US. The increasing trend in the reconstructed PM2.5 in summer over northwestern US is primary due to the positive trend in total carbonaceous aerosols (TCAs), which more than offsets the negative trends in sulfate and nitrate aerosols. This also causes the contribution of TCA to the reconstructed PM2.5 to show an increasing trend in summer over the same region. The positive trend in TCA in summer over northwestern US is stronger under the drought than the wet conditions, hence resulting in a stronger positive trend in the contribution of TCA to the reconstructed PM2.5 in the drought conditions. Drought enhances TCA over northwestern US through its impact on wildfire, and the temporal change of TCA mainly follows the non‐linear variation of SPEI. Although droughts are found to have statistically significant impacts on the trends in sulfate, nitrate, and dust in other regions and seasons, the small contributions of these species to the reconstructed PM2.5 make their trend variations not sufficient to affect trends in the reconstructed PM2.5.
Keywords:
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Atmospheric Science Earth And Planetary Sciences (miscellaneous) Geophysics Space And Planetary Science
Source:
Journal of Geophysical Research: Atmospheres, 127(24)
DOI:
https://doi.org/10.1029/2022jd037677
ISSN:
2169-897X;2169-8996;
Format:
PDF
Publisher:
American Geophysical Union (AGU)
Document Type:
Journal Article
Funding:
Grant no. NA19OAR4310177
Rights Information:
Other
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:7bd1affe7d8afe44eb7aac2d6ef302a0c1709af3def2d2a88ccf5eec63bebb9d
Download URL:
https://repository.library.noaa.gov/view/noaa/60575/noaa_60575_DS1.pdf
File Type:

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