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Rivers as Sources of Freshwater Ice-Nucleating Particles

Knackstedt, Kathryn Ann
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498766754881706

Abstract Details

2017, Master of Science (MS), Bowling Green State University, Biological Sciences.
Ice nucleating particles (INP) are a neglected, but integral component of the water cycle. Preliminary evidence is presented showing that rivers possess high numbers of warm temperature biological INP and that these may become airborne. Whereas recent efforts characterizing marine INPs are beginning to inform circulation models to predict weather patterns, the contribution of freshwater INPs to the water cycle has been largely overlooked. Evidence is presented showing that rivers possess high numbers of warm temperature (= -10 °C) INP whose abundance may be several orders of magnitude higher than marine sources. Focusing on the Maumee River, situated in a predominantly agricultural watershed and which serves as the largest tributary to Lake Erie, a seasonal analysis of surface water INP revealed a strong positive relationship between INP abundance and river discharge with INP abundance varying by three orders of magnitude between low river discharge in summer and early fall and high discharge in winter and spring. Assessing the potential of INP to become aerosolized, INP abundance was consistently higher in air sampled near engineered features promoting turbulence compared to controls located away from direct influence of the river. The analysis also indicates that the vast majority of the INP in river surface waters are subcellular and so not attributable to known INP classes. Apart from seasonally-resolved surveys of the Maumee River, a small focused study was conducted at the University of Michigan Biological Station (UMBS) Stream Research Facility. This served as a way to engineer different turbulent river features on a smaller scale to determine aerosolization of warm temperature INP. Combined with recent surveys of other major US rivers, there is growing consensus that the presence of abundant warm temperature INP is a common, if not ubiquitous feature of fresh water systems.
Robert McKay, Dr. (Advisor)
George Bullerjahn, Dr. (Committee Member)
Paul Morris, Dr. (Committee Member)
61 p.
Aquatic Sciences; Biology; Cellular Biology; Environmental Science; Hydrologic Sciences; Limnology; Microbiology
Ice-Nucleating Particles; Biology; Limnology; Freshwater; Microbiology; Aerosolization; Water Cycle

Recommended Citations

Citations

  • Knackstedt, K. A. (2017). Rivers as Sources of Freshwater Ice-Nucleating Particles [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498766754881706

    APA Style (7th edition)

  • Knackstedt, Kathryn. Rivers as Sources of Freshwater Ice-Nucleating Particles. 2017. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498766754881706.

    MLA Style (8th edition)

  • Knackstedt, Kathryn. "Rivers as Sources of Freshwater Ice-Nucleating Particles." Master's thesis, Bowling Green State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1498766754881706

    Chicago Manual of Style (17th edition)

bgsu1498766754881706
401
© 2017, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.