Partitioning dissolved organic carbon and total dissolved nitrogen across particle size fractions ranging from 0.1 to 0.7 m, Cape Bounty Arctic Watershed Observatory (CBAWO)

The molecular weight or size of organic molecules can affect their biological or chemical reactivity in natural systems. This research investigates how vegetation and the flow of streams and rivers can dictate the molecular weight of organic matter in water bodies in the High Arctic. Results from the 2019 field season will be used to design future experiments investigating the molecular weight of organic matter and its interactions with light, microbes and metals. Rivers and headwater catchments were sampled weekly to investigate spatial and temporal controls on the particle size of dissolved organic matter. Analysis of dissolved organic carbon and total dissolved nitrogen will be used to design future experimental work investigating relationships between DOM particle size, lability and associations with trace metals.

有机分子的分子量或分子尺寸，可影响其在自然系统中的生物与化学反应活性。本研究旨在探究高北极地区（High Arctic）水体中，植被与溪流、河流的径流如何调控有机质的分子量。2019年野外考察季所获数据，将用于设计后续实验，以研究有机质的分子量及其与光照、微生物和金属元素的相互作用。研究团队对河流与源头集水区（headwater catchments）进行每周采样，以解析溶解有机质（Dissolved Organic Matter, DOM）粒径的空间与时间控制因子。通过对溶解有机碳（Dissolved Organic Carbon, DOC）与总溶解氮（Total Dissolved Nitrogen, TDN）的分析，将为后续实验研究提供支撑，以探究DOM粒径、易降解性及其与痕量金属（trace metals）的结合关系。