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Interannual variability in ozone removal by a temperate deciduous forest
Author(s) -
Clifton O. E.,
Fiore A. M.,
Munger J. W.,
Malyshev S.,
Horowitz L. W.,
Shevliakova E.,
Paulot F.,
Murray L. T.,
Griffin K. L.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl070923
Subject(s) - eddy covariance , atmospheric sciences , deciduous , environmental science , ozone , sink (geography) , temperate deciduous forest , tropospheric ozone , stomatal conductance , water vapor , canopy , climatology , troposphere , chemistry , meteorology , ecosystem , photosynthesis , ecology , geology , geography , biology , biochemistry , cartography
The ozone (O 3 ) dry depositional sink and its contribution to observed variability in tropospheric O 3 are both poorly understood. Distinguishing O 3 uptake through plant stomata versus other pathways is relevant for quantifying the O 3 influence on carbon and water cycles. We use a decade of O 3 , carbon, and energy eddy covariance (EC) fluxes at Harvard Forest to investigate interannual variability (IAV) in O 3 deposition velocities ( v d , O 3). In each month, monthly mean v d , O 3for the highest year is twice that for the lowest. Two independent stomatal conductance estimates, based on either water vapor EC or gross primary productivity, vary little from year to year relative to canopy conductance. We conclude that nonstomatal deposition controls the substantial observed IAV in summertime v d , O 3during the 1990s over this deciduous forest. The absence of obvious relationships between meteorology and v d , O 3implies a need for additional long‐term, high‐quality measurements and further investigation of nonstomatal mechanisms.