Analysis of porewater and bottom water dissolved organic matter of hydrothermal sediments in the Guaymas Basin@en

Analysis of porewater and bottom water dissolved organic matter (DOM) of hydrothermal sediments (3 to 106 C) in the Guaymas Basin. Samples were taken by HOV Alvin during cruise Atlantis AT 42-05 in November 2018. Dataset contains quantitative and qualitative analysis of bulk water and solid-phase extracted (SPE) DOM. We determined DOC and TDN concentrations of bulk water and SPE-DOM along with absorbance and fluorescence measurements. Fluorescence of excitation-emission matrices (EEMs) was decomposed by parallel factor analysis (PARAFAC) and resolved in 7 components. SPE-DOM was analyzed on the molecular level by ultrahigh-resolution mass spectrometry (FT-ICR-MS) and individual molecular formulae were assigned.本数据集聚焦瓜伊马斯海盆内温度介于3至106摄氏度的热液沉积物孔隙水与底层水溶解态有机质（Dissolved Organic Matter, DOM）的特征分析。样本采集于2018年11月开展的亚特兰蒂斯号航次AT 42-05，由载人深潜器阿尔文（HOV Alvin）获取。数据集涵盖本体水与固相萃取（Solid-Phase Extraction, SPE）所得DOM的定量与定性分析：我们测定了本体水及SPE-DOM的溶解有机碳（Dissolved Organic Carbon, DOC）与总溶解氮（Total Dissolved Nitrogen, TDN）浓度，同时完成了吸光度与荧光特性检测。通过平行因子分析（Parallel Factor Analysis, PARAFAC）对激发发射矩阵光谱（Excitation-Emission Matrices, EEMs）的荧光信号进行分解，最终解析得到7种组分。此外，我们采用傅里叶变换离子回旋共振质谱（FT-ICR-MS）这一超高分辨质谱技术，在分子层面对SPE-DOM进行分析，并完成了单分子分子式的精准归属。