Dissolved Organic Carbon (DOC) and Dissolved Total Nitrogen (DTN) from Northeast U.S. Shelf Long Term Ecological Research (NES-LTER) Transect cruises, ongoing since 2022

Dissolved organic carbon and dissolved total nitrogen are measured from discrete bottle samples collected during CTD-rosette casts on Northeast U.S. Shelf Long-Term Ecological Research (NES-LTER) Transect cruises (ongoing since 2022). Sampling frequency is approximately seasonal. Sample collection is paired with particulate organic carbon at surface, subsurface chlorophyll max, and sometimes a third depth. Samples are filtered directly from the CTD rosette and acidified in the field, then analyzed using a Shimadzu TOC-LCPH total organic carbon analyzer coupled to a TNM-L analyzer for total nitrogen. Values are reported in micromoles per liter.

溶解有机碳与溶解总氮的测定样本来源于美国东北陆架长期生态研究（NES-LTER）断面巡航（2022年起持续开展）期间通过CTD-多瓶采水器投放（CTD-rosette casts）采集的离散瓶样。采样频率约为季节性。样本采集与表层、次表层叶绿素最大值处的颗粒有机碳配对，有时还会在第三个深度进行配对采集。样本直接从CTD多瓶采水器中过滤，现场酸化后，采用岛津TOC-LCPH总有机碳分析仪（耦合TNM-L分析仪测定总氮）进行分析。结果以微摩尔每升为单位报告。