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The Great Barrier Reef: A source of CO_2 to the atmosphere

机译:大堡礁:大气中CO_2的来源

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The Great Barrier Reef (GBR) is the largest contiguous coral reef system in the world. Carbonate chemistry studies and flux quantification within the GBR have largely focused on reef calcification and dissolution, with relatively little work on shelf-scale CO2 dynamics. In this manuscript, we describe the shelf-scale seasonal variability in inorganic carbon and air-sea CO2 fluxes over the main seasons (wet summer, early dry and late dry seasons) in the GBR.Our large-scale dataset reveals that despite spatial-temporal variations, the GBR as a whole is a net source of CO2 to the atmosphere, with calculated air-sea fluxes varying between -6.19 and 12.17 mmol m(-2) d(-1) (average +/- standard error: 1.44 +/- 0.15 mmol m(-2) d(-1)), with the strongest release of CO2 occurring during the wet season. The release of CO2 to the atmosphere is likely controlled by mixing of Coral Sea surface water, typically oversaturated in CO2, with the warm shelf waters of the GBR. This leads to oversaturation of the GBR system relative to the atmosphere and a consequent net CO2 release.
机译:大堡礁(GBR)是世界上最大的毗连珊瑚礁系统。 GBR中的碳酸盐化学研究和通量量化主要集中在礁石的钙化和溶解上,而关于架子规模的CO2动力学的工作则相对较少。在本手稿中,我们描述了GBR主要季节(夏季潮湿,早期干旱和晚期干燥季节)中无机碳和气-海CO2通量的货架规模季节性变化。我们的大规模数据集显示,尽管空间随时间变化,GBR总体上是大气中二氧化碳的净来源,计算出的海气通量在-6.19和12.17 mmol m(-2)d(-1)之间变化(平均+/-标准误差:1.44 +/- 0.15 mmol m(-2)d(-1)),最强的CO2释放发生在雨季。通过将通常在CO2中过饱和的珊瑚海地表水与GBR的温暖架子水混合,可以控制向大气中释放CO2。这导致GBR系统相对于大气过饱和,并因此导致净CO2释放。

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