کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8884872 | 1626595 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Greenhouse gases and submarine groundwater discharge in a Sydney Harbour embayment (Australia)
ترجمه فارسی عنوان
تخلیه گازهای گلخانه ای و تخلیه آب زیرزمینی در یک بندر سیدنی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
We investigated whether submarine groundwater discharge (SGD) traced by radon (222Rn, a natural groundwater tracer) may drive carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in surface waters in Chowder Bay, a marine embayment in Sydney Harbour, Australia. A radon mass balance revealed significant groundwater discharge rates into the bay (8.7 ± 5.8 cm dâ1). The average CO2, CH4, and N2O concentrations in the subterranean estuary were 3.5, 7.2, and 2.8 times higher than the average surface water concentrations, indicating the possibility of coastal groundwater as a source of greenhouse gases to the bay. SGD-derived fluxes of greenhouse gases were 5.02 ± 2.28 mmol mâ2 dâ1, 5.63 ± 2.55 μmol mâ2 dâ1, and 1.72 ± 0.78 μmol mâ2 dâ1 for CO2, CH4 and N2O, respectively. The average CO2 evasion rate from surface water was 2.29 ± 0.46 mmol mâ2 dâ1 while CH4 and N2O evasion rates were 12.89 ± 3.05 and 1.23 ± 0.25 μmol mâ2 dâ1 respectively. Therefore, groundwater-derived greenhouse gas fluxes accounted for >100% CO2 and N2O and â¼43% of CH4 surface water evasion, indicating SGD is likely an important source of greenhouse gases to surface waters. However, this may be due to observations being performed near the SGD source, which may overestimate its contribution to the wider Sydney Harbour. Over a 20-year time frame, the combined emissions of CH4 and N2O from surface waters to the atmosphere accounted for 25% of the total CO2-equivalent emissions. Although this study gives preliminary insight into SGD and greenhouse gas dynamics in Sydney Harbour, more spatial and temporal resolution sampling is required to fully constrain these processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 207, 31 July 2018, Pages 499-509
Journal: Estuarine, Coastal and Shelf Science - Volume 207, 31 July 2018, Pages 499-509
نویسندگان
Mahmood Sadat-Noori, Douglas R. Tait, Damien T. Maher, Ceylena Holloway, Isaac R. Santos,