Hanyang University ERICA, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do 15588, South Korea.
KOPRI Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, South Korea.
Water Res. 2020 Dec 15;187:116442. doi: 10.1016/j.watres.2020.116442. Epub 2020 Sep 21.
In this study, we newly investigated surface water samples collected in two contrasting Korean estuary systems (i.e., closed Geum and open Seomjin estuaries) along a salinity gradient in winter (December) in 2016. The main objectives were to determine the source of particulate organic carbon (POC) in winter and to assess the environmental factors inducing seasonal differences in POC characteristics. Concentrations and dual carbon isotopes (δC and ΔC) of POC were analyzed together with concentrations and stable carbon isotopes (δC) of dissolved inorganic carbon (DIC) and compared with those obtained in summer (August) in 2016. Our study provided a new insight that for both estuarine systems, the seasonal contrast in POC characteristics was associated with stronger wind-induced estuarine sediment resuspensions in winter than in summer providing a greater contribution of aged POC to the total POC pool in winter.
在这项研究中，我们新调查了 2016 年冬季（12 月）沿盐度梯度在两个对比鲜明的韩国河口系统（即封闭的 Geum 和开放的 Seomjin 河口）采集的地表水样本。主要目的是确定冬季颗粒有机碳（POC）的来源，并评估导致 POC 特征季节性差异的环境因素。我们分析了 POC 的浓度和双碳同位素（δC 和ΔC）以及溶解无机碳（DIC）的浓度和稳定碳同位素（δC），并与 2016 年 8 月夏季获得的数据进行了比较。我们的研究提供了一个新的见解，即对于这两个河口系统，冬季 POC 特征的季节性差异与冬季比夏季更强的风引起的河口沉积物再悬浮有关，这使得冬季老化的 POC 对总 POC 库的贡献更大。
