| Summary: | The particulate element data in this dataset were determined from samples collected by in-situ pumps from the upper water column during three research cruises in May (D350, D351) and July-August (D354) 2010. All three research cruises were part of a project to study seasonal iron limitation in the high latitude North Atlantic (HLNA), notably in the Irminger Basin and the Iceland Basin. Research cruises D350 and D351 coincided with the April/May 2010 eruption of the Eyjafjallajökull volcano in southern Iceland, which led to significant deposition of volcanic ash over the study region and perturbation of local iron biogeochemistry, and the influence of this volcanic material is evident in several of the springtime samples in this dataset. Data from the summertime research cruise (D354) also suggest more localized influence from volcanic ash that may have been resuspended from deposits in southern Iceland by wind events and transported over the Iceland Basin. The data are presented here in three worksheets. The first (“1. Total element amounts”) gives total ng amounts measured in each sample following a leach and digest treatment and accounting for material lost to the rinse when material was rinsed from the SAPS filters. Also included is the total mass of material (mg) rinsed from each filter (to calculate ng/mg elemental content of the material) and the volume of seawater filtered through each in situ pump (to calculate concentrations in ng/L). The worksheet also displays for each element the percentage that was refractory in nature for each sample (i.e. accessed by a strong acid digestion). The second worksheet (“2. Leach and digest values”) lists separately the filter blank corrected amounts of each element in the acetic acid leach and the strong acid digest, with uncertainties propagated from filter blank corrections and uncertainties in filter mass measurements. The third worksheet (“3. Rinse loss percentages”) summarizes losses of each element lost from the particulate material as it was rinsed off the large ...
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