This Project Grant award from the National Science Foundation (NSF) Geosciences program (CFDA 47.050) provides $107,673 to the Regents of the University of Minnesota to study the role of dissolved organic nitrogen (DON) in sustaining biological productivity in the oligotrophic subtropical North Pacific Ocean. The award will fund a one-month research expedition from San Diego, CA to Honolulu, HI to collect observations on DON concentration, composition, and utilization by marine microbes. The project aims to quantify the contribution of allochthonous, or laterally transported, DON to meeting the nitrogen demand of net community production in the nutrient-limited subtropical gyre. The research findings will be used to improve global ocean biogeochemistry models and assess the global significance of DON as an organic nutrient source for subtropical ocean ecosystems. No sub-awards are planned under this grant.
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