Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island
Abstract Isotopic and hydrochemical data from lakes provide direct information on catchment response to changing rainfall, evaporation, nutrient cycling, and the health of ecosystems. These techniques have not been widely applied to lakes in the Southern Hemisphere high latitudes, including Southern...
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ftdoajarticles:oai:doaj.org/article:3d2505df6fb344b688f3803731640801 2023-05-15T17:09:56+02:00 Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island Karina T. Meredith Krystyna M. Saunders Liza K. McDonough Melodie McGeoch 2022-12-01T00:00:00Z https://doi.org/10.1038/s41598-022-25115-3 https://doaj.org/article/3d2505df6fb344b688f3803731640801 EN eng Nature Portfolio https://doi.org/10.1038/s41598-022-25115-3 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-25115-3 2045-2322 https://doaj.org/article/3d2505df6fb344b688f3803731640801 Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022) Medicine R Science Q article 2022 ftdoajarticles https://doi.org/10.1038/s41598-022-25115-3 2022-12-30T20:11:12Z Abstract Isotopic and hydrochemical data from lakes provide direct information on catchment response to changing rainfall, evaporation, nutrient cycling, and the health of ecosystems. These techniques have not been widely applied to lakes in the Southern Hemisphere high latitudes, including Southern Ocean Islands (SOIs) experiencing rapid, significant shifts in climate. Historical work has highlighted the localised nature of geochemical drivers in controlling the hydrochemical evolution of lakes, such as geology, sea spray contribution, vegetation, geographical location, and ice cover extent. The role of groundwater in lake hydrology and hydrochemistry has not been identified until now, and its omission will have major implications for interpreting soil–water–air processes affecting lakes. Here we present the first comprehensive, island-wide hydrochemical and isotopic survey of lakes on a SOI. Forty lakes were examined across Macquarie Island, using comparable methods to identify key environmental processes and their geochemical drivers. Methods include stable carbon (δ13CDOC: dissolved organic carbon and δ13CDIC: dissolved inorganic carbon), oxygen (δ18O), hydrogen (δ2H) and strontium isotopic ratios (87Sr/86Sr) in water. These provide essential baseline data for hydrological, biological, and geochemical lake processes. Lakes on the western side of the island are influenced by sea spray aerosols. In general, it was found that lakes at higher elevations are dilute and those located in lower elevation catchments have experienced more water–rock interactions. The hydrochemical and isotopic tracers suggest that lakes in lower elevations contain more terrestrial sourced ions that may be contributed from groundwater. Increasing temperatures and changing rainfall patterns predicted for the region will lead to shifts in nutrient cycles, and impact the island’s unique ecosystems. Future research will focus on long-term monitoring to understand seasonal, annual, and long-term variability to test fundamental hypotheses ... Article in Journal/Newspaper Macquarie Island Southern Ocean Directory of Open Access Journals: DOAJ Articles Soi ENVELOPE(30.704,30.704,66.481,66.481) Southern Ocean 1 73 |
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Directory of Open Access Journals: DOAJ Articles |
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Medicine R Science Q |
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Medicine R Science Q Karina T. Meredith Krystyna M. Saunders Liza K. McDonough Melodie McGeoch Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
topic_facet |
Medicine R Science Q |
description |
Abstract Isotopic and hydrochemical data from lakes provide direct information on catchment response to changing rainfall, evaporation, nutrient cycling, and the health of ecosystems. These techniques have not been widely applied to lakes in the Southern Hemisphere high latitudes, including Southern Ocean Islands (SOIs) experiencing rapid, significant shifts in climate. Historical work has highlighted the localised nature of geochemical drivers in controlling the hydrochemical evolution of lakes, such as geology, sea spray contribution, vegetation, geographical location, and ice cover extent. The role of groundwater in lake hydrology and hydrochemistry has not been identified until now, and its omission will have major implications for interpreting soil–water–air processes affecting lakes. Here we present the first comprehensive, island-wide hydrochemical and isotopic survey of lakes on a SOI. Forty lakes were examined across Macquarie Island, using comparable methods to identify key environmental processes and their geochemical drivers. Methods include stable carbon (δ13CDOC: dissolved organic carbon and δ13CDIC: dissolved inorganic carbon), oxygen (δ18O), hydrogen (δ2H) and strontium isotopic ratios (87Sr/86Sr) in water. These provide essential baseline data for hydrological, biological, and geochemical lake processes. Lakes on the western side of the island are influenced by sea spray aerosols. In general, it was found that lakes at higher elevations are dilute and those located in lower elevation catchments have experienced more water–rock interactions. The hydrochemical and isotopic tracers suggest that lakes in lower elevations contain more terrestrial sourced ions that may be contributed from groundwater. Increasing temperatures and changing rainfall patterns predicted for the region will lead to shifts in nutrient cycles, and impact the island’s unique ecosystems. Future research will focus on long-term monitoring to understand seasonal, annual, and long-term variability to test fundamental hypotheses ... |
format |
Article in Journal/Newspaper |
author |
Karina T. Meredith Krystyna M. Saunders Liza K. McDonough Melodie McGeoch |
author_facet |
Karina T. Meredith Krystyna M. Saunders Liza K. McDonough Melodie McGeoch |
author_sort |
Karina T. Meredith |
title |
Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
title_short |
Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
title_full |
Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
title_fullStr |
Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
title_full_unstemmed |
Hydrochemical and isotopic baselines for understanding hydrological processes across Macquarie Island |
title_sort |
hydrochemical and isotopic baselines for understanding hydrological processes across macquarie island |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
https://doi.org/10.1038/s41598-022-25115-3 https://doaj.org/article/3d2505df6fb344b688f3803731640801 |
long_lat |
ENVELOPE(30.704,30.704,66.481,66.481) |
geographic |
Soi Southern Ocean |
geographic_facet |
Soi Southern Ocean |
genre |
Macquarie Island Southern Ocean |
genre_facet |
Macquarie Island Southern Ocean |
op_source |
Scientific Reports, Vol 12, Iss 1, Pp 1-12 (2022) |
op_relation |
https://doi.org/10.1038/s41598-022-25115-3 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-25115-3 2045-2322 https://doaj.org/article/3d2505df6fb344b688f3803731640801 |
op_doi |
https://doi.org/10.1038/s41598-022-25115-3 |
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