Details:

Journal Title:
Journal of Geophysical Research: Atmospheres
Personal Author:
Clifton, O. E. ; Fiore, A. M. ; Munger, J. W. ; Wehr, R.
Clifton, O. E. ; Fiore, A. M. ; Munger, J. W. ; Wehr, R. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)
OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:
Spatiotemporal variability in ozone dry deposition is often overlooked despite its implications for interpreting and modeling tropospheric ozone concentrations accurately. Understanding the influences of stomatal versus nonstomatal deposition processes on ozone deposition velocity is important for attributing observed changes in the ozone depositional sink and associated damage to ecosystems. Here, we aim to identify the stomatal versus nonstomatal deposition processes driving observed variability in ozone deposition velocity over the northeastern United States during June–September. We use ozone eddy covariance measurements from Harvard Forest in Massachusetts, which span a decade, and from Kane Experimental Forest in Pennsylvania and Sand Flats State Forest in New York, which span one growing season each, along with observation-driven modeling. Using a cumulative precipitation indicator of soil wetness, we infer that high soil uptake during dry years and low soil uptake during wet years may contribute to the twofold interannual variability in ozone deposition velocity at Harvard Forest. We link stomatal deposition and humidity to variability in ozone deposition velocity on daily timescales. The humidity dependence may reflect higher uptake by leaf cuticles under humid conditions, noted in previous work. Previous work also suggests that uptake by leaf cuticles may be enhanced after rain, but we find that increases in ozone deposition velocity on rainy days are instead mostly associated with increases in stomatal conductance. Our analysis highlights a need for constraints on subseasonal variability in ozone dry deposition to soil and fast in-canopy chemistry during ecosystem stress.
Keywords:
[+]
Atmospheric Chemistry Ozone
Source:
JGR Atmospheres 124(10): 5612-5628
DOI:
https://doi.org/10.1029/2018JD029073
Document Type:
Journal Article
Funding:
Grant no. NA14OAR4310133
Place as Subject:
United States
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:1a66f173593ef65c091366e6cbd3730b0491159f613ee1c0d9491602df53d06c
Download URL:
https://repository.library.noaa.gov/view/noaa/45510/noaa_45510_DS1.pdf
File Type:

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