Concentrations of DIN and DON. Spatiotemporal variations in concentrations (color scales) of DIN (left panels) and DON (right panels) in the sea surface microlayer (SML, top panels) and in underlying water (ULW, bottom panels) from October 2012 to October 2013. Highest concentrations measured (up to 38 µm L^–1) exceed the scale bar. DOI: https://doi.org/10.1525/elementa.255.f9