Nitrogen export

Peterson BJ, Wollheim WM, MuUiolland PJ, Webster JR, Meyer JL, Tank JL, Marti E, Bowden WB, Valett HM, Hershey AE, McDowell WH, Dodds WK, Hamilton SK, Gregory SV, Morral DD (2001) Control of nitrogen export from watersheds by headwater streams. Science 292 86-90... [Pg.193]

Lewis DB, Grimm NB (2007) Hierarchical regulation of nitrogen export from urban catchments interactions of storms and landscapes. Ecol Appl 17 2347-2364... [Pg.194]

Buesseler KO, Bacon MP, Cochran JK, Livingston HD (1992b) Carbon and nitrogen export during the JGOFS North Atlantic Bloom Experiment estimated from " Th U disequilibria. Deep-Sea Res I 39 1115-1137... [Pg.488]

Basin this was found to be a good predictor of river nitrogen export to the North Atlantic Ocean. (Modified from Howarth et al., 1996.)... [Pg.42]

Table 10.3 Nitrogen exported (kg N ha y 1) to estuaries from different watershed N sources and the percentage of N exported from different sources (in parentheses).

Bouwman, A.F., van Drecht, G, Knoop, J.M., Beusen, A.H.W., and Meinardi, C.R. (2005) Exploring changes in river nitrogen export to the worlds oceans. Global Biogeochem. Cycles 19, doi 1029/2004GB002314. [Pg.551]

Figure 1.5c shows that preformed NO represents a very substantial fraction of the total NO in the thermocHne and deep ocean, and that it is responsible for about half of the surface to deep gradient in NO3. It also shows that much of the NOJ increase in the deep Atlantic along the path of NADW is actually caused by mixing of a high preformed NOj end-member from the Southern Ocean while the NOj increase from remineralization is relatively small (Fig. 1.5b). The highest concentrations of remineralized NO are found in the thermocline, as expected from the fact that about 90% of the organic nitrogen exported from the upper ocean is reminer-alized above 1000 m (e.g., Martin et al. (1987)).

$Figure 1.5c shows that preformed NO represents a very substantial fraction of the total NO in the thermocHne and deep ocean, and that it is responsible for about half of the surface to deep gradient in NO3. It also shows that much of the NOJ increase in the deep Atlantic along the path of NADW is actually caused by mixing of a high preformed NOj end-member from the Southern Ocean while the NOj increase from remineralization is relatively small (Fig. 1.5b). The highest concentrations of remineralized NO are found in the thermocline, as expected from the fact that about 90% of the organic nitrogen exported from the upper ocean is reminer-alized above 1000 m (e.g., Martin et al. (1987)).$

Spatial Patterns in Amount and Form of River Nitrogen Export 47 ... [Pg.469]

Sources of Nitrogen and Factors Controlling Nitrogen Export 479... [Pg.469]

Effects on Nitrogen Export of Long-Term Human Modification of Discharge 492... [Pg.469]

Howarth, R. W., Swaney, D., Boyer, E. W., Marine, R., Jaworski, N., and Goodale, C. (2006). The influence of climate on average nitrogen export from large watersheds in the Northeastern United States. Biogeochemistry doi 10.1007/sl0533-006-9010-1. [Pg.506]

Figure 36.9 Fluxes of nitrogen (kg per km of watershed area per year) from the landscape to coastal oceans in rivers for contrasting regions of the world in the temperate zone. The natural background flux is based on the intercept of plots of nitrogen export vs. NANI (such as shown in Figs. 36.2 and 36.4B). Data from Flowarth el al. (1996,2002) Bashkin et al. (2002).

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