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IPY-OSC Francisco Fernandoy-46
APECS is an international and interdisciplinary organization for undergraduate and graduate students, postdoctoral researchers, early faculty members, educators and others with interests in Polar Regions and the wider cryosphere. Our aims are to stimulate interdisciplinary and international research collaborations, and develop effective future leaders in polar research, education and outreach. We seek to achieve these aims by:
  • Facilitating international and interdisciplinary networking to share ideas and experiences and to develop new research directions and collaborations;
  • Providing opportunities for professional career development; and
  • Promoting education and outreach as an integral component of polar research and to stimulate future generations of polar researchers.

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KitaeKim2010aAuthor(s):
Kitae Kim*, Wonyong Choi*, Michael R. Hoffmann**, Ho-Il Yoon***, Byong-Kwon Park***

*School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea **W. M. Keck Laboratories, California Institute of Technology, Pasadena, CA, USA ***Korea Polar Research Institute, Incheon, Korea

Originally Presented at:
IPY Oslo Science Conference, Oslo, Norway 8-12 June 2010

Abstract:
The availability of iron has been thought as a main limiting factor for the phytoplankton productivity and related with the uptake of atmospheric CO2 and algal blooms in fresh and sea waters. In this work, the formation of bio-available iron (Fe(II)aq) from the dissolution of iron oxide particles was investigated in ice phase under both UV and visible light irradiation. The photoreductive dissolution of iron oxides proceeded slowly in aqueous solution (pH 3.5) but was significantly accelerated in polycrystalline ice with subsequently releasing more bioavailable ferrous iron upon thawing. The enhanced photogeneration of Fe(II)aq in ice was confirmed regardless of the type of iron oxides [hematite, maghemite (?-Fe2O3), goethite (?-FeOOH)] and the kind of electron donors. The ice-enhanced dissolution of iron oxides was also observed under visible light irradiation although the dissolution rate was much slower compared with the case of UV radiation. The iron oxide particles and organic electron donors (if any) in ice are concentrated and aggregated in the liquid-like grain boundary region (freeze concentration effect) where protons are also highly concentrated (lower pH). The enhanced photodissolution of iron oxides should occur in this confined boundary region. We hypothesized that electron hopping through the interconnected grain boundaries of iron oxide particles facilitates the separation of photoinduced charge pairs. The outdoor experiments carried out under ambient solar radiation of Ny-Alesund (Svalbard, 78.55 N) also showed that the generation of dissolved Fe(II)aq via photoreductive dissolution is enhanced when iron oxides are trapped in ice. Our results imply that the ice(snow)-covered surfaces and ice-cloud particles containing iron-rich mineral dusts in the polar and cold environments provide a source of bioavailable iron when they thaw.

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Featured Member

Sarah_IMG_5411_cropped

Arctic Research Consortium of the United States

Sarah Crowley currently works as an education project manager for the Arctic Research Consortium of the United States in Fairbanks, AK. She manages PolarTREC, a teacher-researcher experience program via a grant from the National Science Foundation. With partners such as UA-Fairbanks, Alaska Geographic and the National Park Service, Sarah develops and implements teacher trainings on climate change and polar science for online platforms and in-­field experiences. Most recently she has worked tirelessly with partners such as APECS to build Polar Educators International; a professional network for those who educate in, for, and about the polar regions.

Through her years teaching environmental education, Sarah developed a passion for polar science and facilitating meaningful nature/science education experiences for her students and other teachers. Her undergraduate work earned her a BA in Geography in 2004, with a minor in Global Studies. In 2010 she received her M.Ed. in Curriculum and Instruction for Science Education and a Graduate Certificate in Education, Environment, and Community from the University of Washington-Seattle.

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