| 论文编号: | |
| 论文题目: | Dissolved carbon and CDOM in lake ice and underlying waters along a salinity gradient in shallow lakes of Northeast China |
| 英文论文题目: | Dissolved carbon and CDOM in lake ice and underlying waters along a salinity gradient in shallow lakes of Northeast China |
| 第一作者: | 宋开山 |
| 英文第一作者: | Kai S.Song |
| 联系作者: | 宋开山 |
| 英文联系作者: | Kai S.Song |
| 外单位作者单位: | |
| 英文外单位作者单位: | |
| 发表年度: | 2019 |
| 卷: | 571 |
| 期: | |
| 页码: | 545-558 |
| 摘要: | The variations of DOC and DIC concentrations in lake ice and underlying waters were examined in 40 shallow lakes across the Songnen Plain, Northeast China. The lakes, frozen annually during winter, included freshwater and brackish systems (EC？>？1000？μS？cm？1; range: 171–12607？μS？cm？1in underlying water). Results showed that lake ice contained lower DOC (7.2？mg？L？1) and DIC (6.7？mg？L？1) concentration compared to the underlying waters (58.2 and 142.4？mg？L？1, respectively). Large differences in DOC and DIC concentrations of underlying waters were also observed between freshwater (mean？±？SD: 22.3？±？11.5？mg？L？1, 50.7？±？20.6？mg？L？1) and brackish lakes (83.3？±？138.0？mg？L？1, 247.0？±？410.5？mg？L？1). A mass balance model was developed to describe the relative distribution ofsolutesand chemical attributes between ice and the underlying waters. Results showed that water depth and ice thickness were the keyfactors regulatingthe spatial distribution of solutes in the frozen lakes. Chromophoric dissolved organic matter (CDOM)absorption coefficientat 320？nm, aCDOM(320) and specific UV absorbance (SUVA254) were used to characterize CDOM composition and quality. Compared to the underlying waters, CDOM present in ice largely included low aromaticityorganic substances, an outcome perhaps facilitated byice formationandphoto-degradation. In ice and underlying freshwaters, CDOM predominantly included organic C fractions of high aromaticity, while low aromaticity organic substances were observed for brackish lakes. Results of this study suggest that, ifwater salinityincreases due to climate change andanthropogenic activities, significant changes can occur in the dissolved carbon and fate of CDOM in these shallow lakes. |
| 英文摘要: | The variations of DOC and DIC concentrations in lake ice and underlying waters were examined in 40 shallow lakes across the Songnen Plain, Northeast China. The lakes, frozen annually during winter, included freshwater and brackish systems (EC？>？1000？μS？cm？1; range: 171–12607？μS？cm？1in underlying water). Results showed that lake ice contained lower DOC (7.2？mg？L？1) and DIC (6.7？mg？L？1) concentration compared to the underlying waters (58.2 and 142.4？mg？L？1, respectively). Large differences in DOC and DIC concentrations of underlying waters were also observed between freshwater (mean？±？SD: 22.3？±？11.5？mg？L？1, 50.7？±？20.6？mg？L？1) and brackish lakes (83.3？±？138.0？mg？L？1, 247.0？±？410.5？mg？L？1). A mass balance model was developed to describe the relative distribution ofsolutesand chemical attributes between ice and the underlying waters. Results showed that water depth and ice thickness were the keyfactors regulatingthe spatial distribution of solutes in the frozen lakes. Chromophoric dissolved organic matter (CDOM)absorption coefficientat 320？nm, aCDOM(320) and specific UV absorbance (SUVA254) were used to characterize CDOM composition and quality. Compared to the underlying waters, CDOM present in ice largely included low aromaticityorganic substances, an outcome perhaps facilitated byice formationandphoto-degradation. In ice and underlying freshwaters, CDOM predominantly included organic C fractions of high aromaticity, while low aromaticity organic substances were observed for brackish lakes. Results of this study suggest that, ifwater salinityincreases due to climate change andanthropogenic activities, significant changes can occur in the dissolved carbon and fate of CDOM in these shallow lakes. |
| 刊物名称: | Journal of Hydrology |
| 英文刊物名称: | Journal of Hydrology |
| 论文全文: | |
| 英文论文全文: | |
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| 英文第一作者所在部门: | |
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| 论文类别: | |
| 英文论文类别: | K. S. Song, Z. D. Wen, P. A. Jacinthe, Y. Zhao and J. Du |
| 参与作者: | K. S. Song, Z. D. Wen, P. A. Jacinthe, Y. Zhao and J. Du |
| 英文参与作者: |
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Dissolved carbon and CDOM in lake ice and underlying waters along a salinity gradient in shallow lak
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