Hydrographic conditions and fluorescence peaks of dissolved organic matter along a transect at the Brazil–Malvinas Confluence

This dataset comprises hydrographic conditions and fluorescence peak–resolved dissolved organic matter (DOM) properties measured along an oceanographic transect at the Brazil–Malvinas Confluence (Southwestern Atlantic Ocean) during a low-productivity period. The dataset includes geographic coordinates (longitude and latitude in decimal degrees), depth, seawater density, temperature, salinity, dissolved oxygen, bulk fluorescence, and optical indices of DOM (BIX, FI and HIX). In addition, fluorescence intensities of DOM peaks A, B, C, M and T (sensu Coble et al., 1996) are provided, reported in Raman-normalized units. These data allow the characterization of the hydrographic setting and the sources, composition and transformation state of dissolved organic matter under low-productivity conditions in a key oceanographic region influenced by the interaction between subtropical and subantarctic water masses. The dataset is suitable for studies addressing DOM optical properties, water mass structure, biogeochemical gradients and physical–biological coupling at the Brazil–Malvinas Confluence.本数据集涵盖巴西-马尔维纳斯汇流区（西南大西洋）低生产力时期沿海洋断面测量的水文条件，以及经荧光峰解析的溶解性有机质（dissolved organic matter, DOM）属性。数据集包含地理坐标（经度与纬度，单位为十进制度）、水深、海水密度、水温、盐度、溶解氧、总荧光强度，以及溶解性有机质的光学指标（生物源指数BIX、荧光指数FI与腐殖化指数HIX）。此外，还提供了参照Coble等（1996）定义的DOM A、B、C、M、T峰的荧光强度，单位为拉曼归一化单位。 这些数据可用于表征受亚热带与亚南极水团相互作用影响的关键海洋区域在低生产力条件下的水文环境，以及溶解性有机质的来源、组成与转化状态。本数据集适用于针对巴西-马尔维纳斯汇流区溶解性有机质光学特性、水团结构、生物地球化学梯度及物理-生物耦合过程的相关研究。