Journal article
Groundwater seepage as a driver of CO2 evasion in a coastal lake (Lake Ainsworth, NSW, Australia)
Environmental Earth Sciences, Vol.74(1), pp.779-792
2015
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Abstract
<p>In recent years, it has become apparent that carbon dioxide (CO2) emissions from inland water bodies and lakes are an important component of the global carbon cycle. Large-scale lake heterotrophy is thought to be a major driver of CO2 production and may mask other processes such as groundwater input. This study uses radon (222Rn, a natural groundwater tracer) to quantify groundwater discharge, and estimates CO2 outgassing to determine the contribution of groundwater-derived CO2 inputs into Lake Ainsworth (<a href="http://link.springer.com/search?dc.title=New+South+Wales&facet-content-type=ReferenceWorkEntry&sortOrder=relevance">New South Wales</a>, Australia). Lake Ainsworth was a source of CO2 to the atmosphere throughout the study period with outgassing rates ranging from 10.6 to 152.3 mmol m2 day−1. Annual groundwater fluxes were determined using a radon mass balance equated to about 55 ± 50 % of the total volume of water input (via direct precipitation and groundwater) into the lake. In spite of large uncertainties, groundwater seepage was a source of CO2supersaturation in Lake Ainsworth equivalent to 13 ± 25 % of total CO2 outgassing rates. Hence, groundwater discharge may need to be considered for carbon budgets of other lakes.</p>
Details
- Title
- Groundwater seepage as a driver of CO2 evasion in a coastal lake (Lake Ainsworth, NSW, Australia)
- Creators
- Anita Perkins - Southern Cross UniversityIsaac R Santos - Southern Cross UniversityMahmood Sadat-Noori - Southern Cross UniversityJackie R Gatland - Southern Cross UniversityDamien T Maher - Southern Cross University
- Publication Details
- Environmental Earth Sciences, Vol.74(1), pp.779-792
- Identifiers
- 3532; 991012820436902368
- Academic Unit
- National Marine Science Centre; Centre for Coastal Biogeochemistry; School of Environment, Science and Engineering; Faculty of Science and Engineering; Science
- Resource Type
- Journal article