Origin, distributions, and environmental significance of ubiquitous humic-like fluorophores in Antarctic lakes and streams

Water Research
Morimaru KidaNobuhide Fujitake

Abstract

This study characterized dissolved organic matter (DOM) obtained from 47 lakes and 2 streams on ice-free areas at Lützow-Holm Bay and Amundsen Bay in East Antarctica (n = 74), where few biogeochemical studies have been historically conducted. Samples were analyzed for basic water chemistry and by resin fractionation, UV-vis spectroscopy, and excitation emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). Salinity of the samples ranged very broadly from fresh to hypersaline as a result of evaporative concentration. There was a clear positive correlation between log-salinity and the spectral slopes of DOM (S275-295), an indicator of photodegradation. Thus, we interpreted the correlation as a progression of photodegradation by prolonged water retention time. Of the identified seven PARAFAC components, three ubiquitous humic-like components decreased as photodegradation progressed, while a photorefractory UVC humic-like component increased its relative abundance. A non-humic component, traditionally defined as Peak N, did not show a trend depending on photodegradation, and its level was high in nutrient-rich lakes, presumably due to high in-situ production. We found robust correlations between the rela...Continue Reading

Citations

Jun 15, 2021·Journal of Environmental Management·Hengfeng ZhangMawuli Dzakpasu
Jul 10, 2021·Environmental Science & Technology·Morimaru KidaThorsten Dittmar
Oct 13, 2020·Environmental Science & Technology·Wei XuHua-Zhang Zhao
Aug 22, 2021·The Science of the Total Environment·Morimaru KidaNobuhide Fujitake

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