DIC and DOC 13C tracer data from Shark River Slough and Harney River (FCE), Everglades, South Florida in November 2011

As part of the larger NSF WSC funded project, an SF6 tracer study was conducted in November of 2010 by working groups form ENP, FIU and Univ. of Hawaii. This work included the release of the tracer (SF6), which was sampled in a lagrangian approach as the tracer “patch” moved from the fresh water portion of the system to the mangrove ecotone along the Shark and Harney Rivers. The goal of this study was to measure carbon export through the system. Annie Palya used our new CRDS system to measure the isotopic composition (d13C) of the DOM & DIC (analyzed at RSMAS) during this study, as carbon isotopes may help to resolve different sources of carbon. This analytical approach is relatively new, and will be important for understanding the C-dynamics within the FCE.

本研究作为美国国家科学基金会（NSF）资助的WSC大型项目的一部分，由ENP、FIU及夏威夷大学（Univ. of Hawaii）的工作组于2010年11月开展了六氟化硫（SF6）示踪试验。本次试验包含示踪剂（SF6）的释放环节，当示踪“斑块”从系统的淡水区段沿沙克河与哈尼河向红树林生态交错带移动时，研究采用拉格朗日方法（Lagrangian）对其进行采样。本研究的核心目标为量化该系统内的碳输出量。安妮·帕利亚（Annie Palya）在本次试验期间，使用我们研发的新型腔环衰荡光谱（CRDS）系统，对溶解有机物（DOM）与溶解无机碳（DIC）的碳13同位素比值（δ¹³C）开展了测量，相关分析工作在罗森斯蒂尔海洋与大气科学学院（RSMAS）完成。之所以采用该分析路径，是因为碳同位素可用于区分不同的碳来源。该分析方法相对新颖，对于解析FCE生态系统内的碳动态具有重要价值。