Auxiliary Material for Paper 2007gb002963 Global N removal by freshwater aquatic systems using a spatially distributed, within-basin approach W. M. Wollheim Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire Durham, New Hampshire, USA. C. J. Vorosmarty Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire Durham, New Hampshire, USA. Earth Sciences Department, University of New Hampshire, Durham, New Hampshire, USA. A.F. Bouwman Netherlands Environmental Assessment Agency, Bilthoven, Netherlands. P. Green Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire Durham, New Hampshire, USA. J. Harrison Institute of Marine and Coastal Studies, Rutgers/NOAA CMER Program, Rutgers University, New Brunswick, New Jersey, USA. School of Earth and Environmental Sciences, Washington State University, Vancouver, Washington, USA. E. Linder Department of Mathematics and Statistics, University of New Hampshire, Durham New Hampshire, USA. B. J. Peterson Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts, USA. S. P. Seitzinger Institute of Marine and Coastal Studies, Rutgers/NOAA CMER Program, Rutgers University, New Brunswick, New Jersey, USA. J. P.M. Syvitski Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA. Complete citation: Wollheim, W. M., C. J. Vorosmarty, A. F. Bouwman, P. Green, J. Harrison, E. Linder, B. J. Peterson, S. P. Seitzinger, and J. P.M. Syvitski (2008), Global N removal by freshwater aquatic systems using a spatially distributed, within-basin approach, Global Biogeochem. Cycles, 22, GB2026, doi:10.1029/2007GB002963. Introduction This electronic supplement contains three figures that show (1) characteristics of the global system of rivers, (2) proportion of aquatic removal within basins due to lakes and reservoirs as a function of lake/reservoir surface area, and (3) proportion of total basin removal due to aquatic systems as a function of runoff; and two tables that show (1) the fate of N in five test basins and (2) a table of the statistical results of the relationship between observations and predictions. 1. 2007gb002963-fs01.eps Characteristics of the global system of rivers, combining small rivers located within each grid cell (orders 1-5) and large rivers of the STN-30 river network (orders S1-S6 equivalent to Orders 6 - 11), including (a) mean drainage area and lengths of each order and (b) total length and number globally, and mean width (+/- 1 standard deviation) of each order. Open symbols from Leopold et al. [1964]. 2. 2007gb002963-fs02.eps Proportion of total aquatic removal that is due to (a) lakes versus percent of basin covered by lakes and (b) reservoirs versus percent of basin covered by reservoirs. 3. 2007gb002963-fs03.eps Proportion of total basin removal that is due to aquatic systems versus mean basin runoff in the 402 largest basins . Each point is median within the runoff category (250 mm increments up to the last point which is for runoff > 1750 mm a-1). Error bars denote the 25th and 75th percentiles. Lines show the median for each runoff category in selected scenarios (Table 3). 4. 2007gb002963-ts01.txt Selected characteristics of basins included in Figure 6 and the modeled fate of total N inputs using the Base scenario. 5. 2007gb002963-ts02.txt Statistical results from the comparison of log observed versus log predicted values in Figure 5, including slope and intercept, their standard error and confidence intervals, and R2. U is the statistic for the general likelihood ratio test that simultaneously tests for whether the slope =1 and intercept = 0.