Gradients 3 KM1906 Organic and Inorganic Nutrients

"This dataset is from the Gradients 3 cruise (KM1906) conducted April 10- April 29, 2019 in the North Pacific Ocean. CTD/rosette profiles were taken down to 1000 meters and samples were collected from niskin bottles attached to the CTD." "All organic and inorganic nutrients are analyzed in unfiltered seawater that was sampled aboard into HDPE or polypropylene bottles and immediately frozen. Silicate, phosphate and nitrate+nitrite are determined colormetrically on a SEAL Analytical Autoanalyzer (AA3 with HR detectors), with the exception of nitrate+nitrite that is <0.5umol/L, which is analyzed by chemiluminescence. Total phosphorus (TP) and total nitrogen (TN) are determined by analysis of phosphate and nitrate, respectively, after oxidation by high-intensity ultraviolet light. Total organic phosphorus and total organic nitrogen are determined by subtracting background PO4 and NO3+NO2 from TP and TN, respectively. Total organic carbon is determined by combustion on a Shimadzu TOC-V analyzer."

This description was reproduced using the following sources:

https://simonscmap.com/catalog/datasets/KM1906_Gradients3

https://simonscmap.com/catalog/datasets/MGL1704_Gradients2_Nutrients