1. Graduate Student, Water and Environment Research Center, Univ. of Alaska Fairbanks, P.O. Box 755860, AK 99775-5860. E-mail: ftha@uaf.edu
2. Associate Professor, Water and Environment Research Center, Univ. of Alaska Fairbanks, P.O. Box 755860, AK 99775-5860 (corresponding author). E-mail: ffdlb@uaf.edu
3. Associate Professor, Water and Environment Research Center, Univ. of Alaska Fairbanks, P.O. Box 755860, AK 99775-5860. E-mail: ffsos@uaf.edu
4. Director, Institute of Northern Engineering, Univ. of Alaska Fairbanks, P.O. Box 7555860, AK 99775-5860. E-mail: ffdmw@uaf.edu