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Funding statement
This study was supported in part by NSF
Grants 0823380, 0333257, and 0817064, as well as NSF LTER
and US Forest Service support to sites with long-term
precipitation chemistry records (Andrews, Coweeta, Fernow,
Hubbard Brook, Kane, and Marcell Experimental Forests,
Kellogg Biological Station). We also acknowledge funding to
the National Atmospheric Deposition Program, as well as
support for the EMEP (European precipitation monitoring
program).
Remove constraint Funding statement: This study was supported in part by NSF
Grants 0823380, 0333257, and 0817064, as well as NSF LTER
and US Forest Service support to sites with long-term
precipitation chemistry records (Andrews, Coweeta, Fernow,
Hubbard Brook, Kane, and Marcell Experimental Forests,
Kellogg Biological Station). We also acknowledge funding to
the National Atmospheric Deposition Program, as well as
support for the EMEP (European precipitation monitoring
program).