Geochemistry of Natural Waters and Sediments, Cycling of Nutrients, Aerosol Chemistry
We explore unique phosphorus cycling processes in the Antarctic by collecting samples of dissolved and particulate materials from the waters and ice of the Ross and Amundsen Seas.
We are using synchrotron based techniques at Argonne National Labs to characterize the elemental associations, mineralogy and oxidation state of iron in urban and rural aerosols as well as in various sources such as biomass burning and vehicle exhaust. Recently we have also started to examine phosphorus chemistry in aerosols using the same techniques.
In our ongoing explorations of phosphorus cycling, the Ingall lab group has collected samples on numerous research cruises in waters near Vancouver Canada, Brazil, Cape Verde Islands, Hawaii, North Carolina, Georgia, Peru, Louisiana and Bermuda. Among our many discoveries we have found that dissolved organic phosphorus in the ocean is enriched in unusual compounds called phosphonates (Clark, Ingall and Benner, Nature 1988). We have also recently shown that marine polyphosphates are key players in geologic phosphorus sequestration (Diaz, Ingall and others, Science 2008).