So this one goes in the category of shameless self-promotion (or shameless promoting of my co-authors). We have a new paper out in PLOS ONE about how we combined the USGS SPARROW model, modeled lake depth and volume, and field data from the National Lakes Assessment to improve predicitons of TN and TP.
There is no need for me to re-hash this here, you can check out my blog post on EPA’s It All Starts With Science Blog.
Milstead WB, Hollister JW, Moore RB, Walker HA (2013) Estimating Summer Nutrient Concentrations in Northeastern Lakes from SPARROW Load Predictions and Modeled Lake Depth and Volume. PLoS ONE 8(11): e81457. doi:10.1371/journal.pone.0081457