Global terrestrial biogeochemistry: Perturbations, interactions, and time scales

Braswell, B. H.

doi:10.2172/527485

Cited by 2 publications

(2 citation statements)

References 145 publications

(312 reference statements)

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“…The proportion Interestingly, some of the difference in deposition was driven by of total global N deposition received by forests, which store large uncertainties in the biological sources. For all models, the sum of amounts of carbon in wood, varied between 5.3% (GRANTOUR) the sources did not equal total global deposition (higher in some and 10% (ECHAM) with IMAGES (6.6%), MOGUNTIA (8.9%), cases and lower in others) suggesting that N mass was not and GCTM ( f-h See Table 4 footnotes f-h. from 0.52 to 0.61 Gt C yr-• (Table 4) [Braswell, 1996;Schirnel, 1996].…”

Section: Sources Of Nomentioning

confidence: 99%

“…This study is only the second study to explicitly consider the spatial distribution of nitrogen deposition on ecosystems [Townsend et al, 1996 However, there is much less year to year variability in the N deposition induced terrestrial carbon sink because we do not include interactions with climatic variability in our model. Recent terrestrial carbon sink is determined by interactions between the climate and the nitrogen cycle [Braswell, 1996;Schirnel, 1996].…”

Section: Relation Of This Study To Other Analysesmentioning

confidence: 99%

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Variations in the predicted spatial distribution of atmospheric nitrogen deposition and their impact on carbon uptake by terrestrial ecosystems

et al. 1997

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Abstract. Widespread mobilization of nitrogen into the atmosphere from industry, agriculture, and biomass burning and its subsequent deposition have the potential to alleviate nitrogen limitation of productivity in terrestrial ecosystems, and may contribute to enhanced terrestrial carbon uptake. To evaluate the importance of the spatial distribution of nitrogen deposition for carbon uptake and to better quantify its magnitude and uncertainty NOy-N deposition fields from five different three-dimensional chemical models, GCTM, GRANTOUR, IMAGES, MOGUNTIA, and ECHAM were used to drive NDEP, a perturbation model of terrestrial carbon uptake. Differences in atmospheric sources of NOx-N, transport, resolution, and representation of chemistry, contribute to the distinct spatial patterns of nitrogen deposition on the global land surface; these differences lead to distinct patterns of carbon uptake that vary between 0.7 and 1.3 Gt C yr 'l globally. Less than 10% of the nitrogen was deposited on forests which were most able to respond with increased carbon storage because of the wide C:N ratio of wood as well as its long lifetime. Addition of NHx-N to NOy-N deposition, increased global terrestrial carbon storage to between 1.5 and 2.0 Gt C yr '•, while the "missing terrestrial sink" is quite similar in magnitude. Thus global air pollution appears to be an important influence on the global carbon cycle. If N fertilization of the terrestrial biosphere accounts for the "missing" C sink or a substantial portion of it, we would expect significant reductions in its magnitude over the next century as terrestrial ecosystems become N saturated and O 3 pollution expands.

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Section: Sources Of Nomentioning

confidence: 99%

Section: Relation Of This Study To Other Analysesmentioning

confidence: 99%