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Quantification of blue carbon pathways contributing to negative feedback on climate change following glacier retreat in West Antarctic fjords
Global Change Biology ( IF 11.6 ) Pub Date : 2021-10-17 , DOI: 10.1111/gcb.15898
Nadescha Zwerschke 1, 2 , Chester J Sands 1 , Alejandro Roman-Gonzalez 3 , David K A Barnes 1 , Alice Guzzi 4, 5 , Stuart Jenkins 6 , Carlos Muñoz-Ramírez 7 , James Scourse 3
Affiliation  

Global warming is causing significant losses of marine ice around the polar regions. In Antarctica, the retreat of tidewater glaciers is opening up novel, low-energy habitats (fjords) that have the potential to provide a negative feedback loop to climate change. These fjords are being colonized by organisms on and within the sediment and act as a sink for particulate matter. So far, blue carbon potential in Antarctic habitats has mainly been estimated using epifaunal megazoobenthos (although some studies have also considered macrozoobenthos). We investigated two further pathways of carbon storage and potential sequestration by measuring the concentration of carbon of infaunal macrozoobenthos and total organic carbon (TOC) deposited in the sediment. We took samples along a temporal gradient since time of last glacier ice cover (1–1000 years) at three fjords along the West Antarctic Peninsula. We tested the hypothesis that seabed carbon standing stock would be mainly driven by time since last glacier covered. However, results showed this to be much more complex. Infauna were highly variable over this temporal gradient and showed similar total mass of carbon standing stock per m2 as literature estimates of Antarctic epifauna. TOC mass in the sediment, however, was an order of magnitude greater than stocks of infaunal and epifaunal carbon and increased with time since last ice cover. Thus, blue carbon stocks and recent gains around Antarctica are likely much higher than previously estimated as is their negative feedback on climate change.

中文翻译:

南极西部峡湾冰川退缩后导致气候变化负反馈的蓝碳途径的量化

全球变暖正在导致极地地区周围的海冰大量流失。在南极洲,潮水冰川的退缩正在开辟新的低能量栖息地(峡湾),这些栖息地有可能为气候变化提供负反馈循环。这些峡湾被沉积物上和沉积物中的生物定殖,并充当颗粒物的汇。到目前为止,南极栖息地的蓝碳潜力主要是使用大型动物底栖动物估计的(尽管一些研究也考虑了大型底栖动物)。我们通过测量底栖动物大型底栖动物的碳浓度和沉积物中沉积的总有机碳 (TOC) 研究了另外两种碳储存和潜在封存途径。我们在西南极半岛沿线的三个峡湾沿时间梯度采集了自上次冰川冰盖(1-1000 年)以来的样本。我们检验了海底碳存量主要受自上次冰川覆盖以来的时间驱动的假设。然而,结果表明这要复杂得多。Infauna 在此时间梯度上变化很大,并且显示出相似的每 m 碳立存总质量2作为南极表皮动物的文献估计。然而,沉积物中的 TOC 质量比动物和动物碳储量大一个数量级,并且自上次冰盖以来随着时间的推移而增加。因此,南极洲周围的蓝色碳储量和近期收益可能远高于先前的估计,它们对气候变化的负面反馈也是如此。
更新日期:2021-12-03
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