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.

本数据集的检测指标为溶解有机碳（dissolved organic carbon）与溶解总氮（dissolved total nitrogen），样品取自美国东北陆架长期生态研究（Northeast U.S. Shelf Long-Term Ecological Research, NES-LTER）断面航次（2022年起持续开展）中CTD采水器（CTD rosette）采集的离散瓶水样。采样频率大致按季节周期排布。采样过程会同步采集表层、次表层叶绿素最大值层，以及部分站位的第三深度的颗粒有机碳（particulate organic carbon）样品。水样直接从CTD采水器中过滤并在现场完成酸化处理，随后采用岛津（Shimadzu）TOC-LCPH总有机碳分析仪与TNM-L总氮分析仪联用系统开展检测。所有检测结果以微摩尔每升为单位报告。