Allyson Tessin, University of Leeds, Austin, Tx, United States, Anthony Chappaz, Central Michigan University, Institute for Great Lakes Research - Dept. of Earth and Atmospheric Sciences - Dept. of Chemistry and Biochemistry, Mount Pleasant, MI, United States, Ingrid L Hendy, University of Michigan Ann Arbor, Earth and Environmental Sciences, Ann Arbor, MI, United States and Nathan D Sheldon, Univ of MI-Earth and Environmental Sciences, Ann Arbor, MI, United States