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• W2738562419 endingPage "1987" @default.
• W2738562419 startingPage "1969" @default.
• W2738562419 abstract "Abstract The seasonal pattern of the carbon isotope content (δ 13 C) of atmospheric CO 2 depends on local and nonlocal land‐atmosphere exchange and atmospheric transport. Previous studies suggested that the δ 13 C of the net land‐atmosphere CO 2 flux ( δ source ) varies seasonally as stomatal conductance of plants responds to vapor pressure deficit of air (VPD). We studied the variation of δ source at seven sites across the United States representing forests, grasslands, and an urban center. Using a two‐part mixing model, we calculated the seasonal δ source for each site after removing background influence and, when possible, removing δ 13 C variation of nonlocal sources. Compared to previous analyses, we found a reduced seasonal (March–September) variation in δ source at the forest sites (0.5‰ variation). We did not find a consistent seasonal relationship between VPD and δ source across forest (or other) sites, providing evidence that stomatal response to VPD was not the cause of the global, coherent seasonal pattern in δ source . In contrast to the forest sites, grassland and urban sites had a larger seasonal variation in δ source (5‰) dominated by seasonal transitions in C 3 /C 4 grass productivity and in fossil fuel emissions, respectively. Our findings were sensitive to the location used to account for atmospheric background variation within the mixing model method that determined δ source . Special consideration should be given to background location depending on whether the intent is to understand site level dynamics or regional scale impacts of land‐atmosphere exchange. The seasonal amplitude in δ 13 C of land‐atmosphere CO 2 exchange ( δ source ) varied across land cover types and was not driven by seasonal changes in vapor pressure deficit. The largest seasonal amplitudes of δ source were at grassland and urban sites, driven by changes in C 3 /C 4 grass productivity and fossil fuel emissions, respectively. Mixing model approaches may incorrectly calculate δ source when background atmospheric observations are remote and/or prone to anthropogenic influence." @default.
• W2738562419 created "2017-07-31" @default.
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• W2738562419 date "2017-08-01" @default.
• W2738562419 modified "2023-09-27" @default.
• W2738562419 title "Does vapor pressure deficit drive the seasonality of δ ¹³ C of the net land‐atmosphere CO ₂ exchange across the United States?" @default.
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• W2738562419 doi "https://doi.org/10.1002/2017jg003795" @default.
• W2738562419 hasPublicationYear "2017" @default.
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