期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 841, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156639
关键词
Ice cores; Antarctica; Organic matter; Bacteria; Marine aerosol; Katabatic wind
资金
- National Science Foundation Office of Polar Programs [1637708, 1543396]
- Second Tibetan Plateau Scientific Expedition and Research Program [2019QZKK0503]
- National Key Research and Development Program of China [2019YFC1509103]
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1637708, 1543396] Funding Source: National Science Foundation
This study analyzed ice cores from Taylor Valley, Antarctica to investigate the distribution of organic matter and bacteria. The results showed increasing concentrations of dissolved and particulate organic carbon from the glacier to the coast. Fluorescence analysis identified two components of organic matter in the ice cores. Bacterial abundance was found to be the main factor influencing the quantity and quality of organic matter. The study also found that marine aerosols had a greater impact on organic matter distribution than katabatic winds.
Glaciers can accumulate and release organic matter affecting the structure and function of associated terrestrial and aquatic ecosystems. We analyzed 18 ice cores collected from six locations in Taylor Valley (McMurdo Dry Valleys), Antarctica to determine the spatial abundance and quality of organic matter, and the spatial distribution of bacterial density and community structure from the terminus of the Taylor Glacier to the coast (McMurdo Sound). Our results showed that dissolved and particulate organic carbon (DOC and POC) concentrations in the ice core samples increased from the Taylor Glacier to McMurdo Sound, a pattern also shown by bacterial cell density. Fluorescence Excitation Emission Matrices Spectroscopy (EEMs) and multivariate parallel factor (PARAFAC) modeling identified one humiclike (C1) and one protein-like (C2) component in ice cores whose fluorescent intensities all increased from the Polar Plateau to the coast. The fluorescence index showed that the bioavailability of dissolved organic matter (DOM) also decreased from the Polar Plateau to the coast. Partial least squares path modeling analysis revealed that bacterial abundance was the main positive biotic factor influencing both the quantity and quality of organic matter. Marine aerosol influenced the spatial distribution of DOC more than katabatic winds in the ice cores. Certain bacterial taxa showed significant correlations with DOC and POC concentrations. Collectively, our results show the tight connectivity among organic matter spatial distribution, bacterial abundance and meteorology in the McMurdo Dry Valley ecosystem.
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