Model output for "Is atmospheric phosphorus pollution altering global alpine Lake stoichiometry?"

Model output for: "Anthropogenic activities have significantly altered atmospheric chemistry and changed theglobal mobility of key macronutrients. Here we show that contemporary global patterns in nitrogen (N) andphosphorus (P) emissions drive large hemispheric variation in precipitation chemistry. These global patternsof nutrient emission and deposition (N:P) are in turn closely reflected in the water chemistry of naturallyoligotrophic lakes (r2=0.81, p<0.0001). Observed increases in anthropogenic N deposition play a role innutrient concentrations (r2 = 0.20, p<0.05); however, atmospheric deposition of P appears to be majorcontributor to this pattern (r2 = 0.65, p<0.0001). Atmospheric simulations indicate a global increase in Pdeposition by 1.4 times the preindustrial rate largely due to increased dust and biomass burning emissions.Although changes in the mass flux of global P deposition are smaller than for N, the impacts on primaryproductivitymay be greater because, on average, one unit of increased P deposition has 16 times the influenceof one unit of N deposition. These stoichiometric considerations, combined with the evidence presented here,suggest that increases in P deposition may be a major driver of alpine Lake trophic status, particularly in theSouthern Hemisphere. These results underscore the need for the broader scientific community to consider theimpact of atmospheric phosphorus deposition on the water quality of naturally oligotrophic lakes."