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A modeling study of temporal and spatial pCO2 variability on the biologically active and temperature-dominated Scotian Shelf
Biogeosciences ( IF 3.9 ) Pub Date : 2021-02-25 , DOI: 10.5194/bg-2021-48
Krysten Rutherford , Katja Fennel , Dariia Atamanchuk , Douglas Wallace , Helmuth Thomas

Abstract. Continental shelves are thought to be affected disproportionately by climate change and are a large contributor to global air-sea carbon dioxide (CO2) fluxes. It is often reported that low-latitude shelves tend to act as net sources of CO2 whereas mid- and high-latitude shelves act as net sinks. Here, we combine a high-resolution regional model with surface water time-series and repeat transect observations from the Scotian Shelf, a mid-latitude region in the northwest North Atlantic, to determine what processes are driving the temporal and spatial variability of partial pressure of CO2 (pCO2). In contrast to the global trend, the Scotian Shelf acts as a net source. Surface pCO2 undergoes a strong seasonal cycle associated with both a strong biological drawdown of Dissolved Inorganic Carbon (DIC) in spring, and pronounced effects of temperature, which ranges from 0 °C in the winter to near 20 °C in the summer. Throughout the summer, events with low surface-water pCO2 occur nearshore associated with coastal upwelling. This effect of upwelling on pCO2 is also in contrast to the general assumption that upwelling increases surface pCO2 by delivering DIC-enriched water to the surface. Aside from these localized events, pCO2 is relatively uniform across the shelf. Our model agrees with regional observations, reproduces seasonal patterns of pCO2, and simulates annual outgassing of CO2 from the ocean of +1.9 ± 0.2 mol C m−2 yr−1 for the Scotian Shelf, net neutral CO2 flux of −0.09 ± 0.16 mol C m−2 yr−1 for the Gulf of Maine and uptake by the ocean of −0.88 ± 0.4 mol C m−2 yr−1 for the Grand Banks.

中文翻译:

生物活性和温度主导的斯科蒂货架上时空p CO 2变异性的模型研究

摘要。人们认为大陆架受到气候变化的影响最大,并且是全球气海二氧化碳(CO 2)通量的主要贡献者。经常有报道说,低纬度的架子倾向于充当CO 2的净来源,而中高纬度的架子则充当净汇。在这里,我们将高分辨率的区域模型与地表水时间序列结合起来,并从北大西洋西北部中纬度地区斯科特陆架重复进行横断面观测,以确定哪些过程驱动了分压的时空变化的CO 2p CO 2)。与全球趋势形成鲜明对照的是,斯科蒂尔书架是一个净来源。表面p CO 2经历了一个强烈的季节性周期,这与春季的溶解无机碳(DIC)的大量生物学下降以及温度的显着影响有关,温度的范围从冬天的0°C到夏天的接近20°C。在整个夏季,地表水p CO 2较低的事件发生在近岸,与沿海上升有关。向上膨胀对p CO 2的这种影响也与通常的假设相反,该一般假设是通过将富含DIC的水输送到表面来增加表面p CO 2的。除了这些局部事件外,p CO 2在整个架子上相对均匀。我们的模型与区域性观测结果吻合,再现了p CO 2的季节性模式,并模拟了斯科舍尔大陆架上+1.9±0.2 mol C m −2  yr -1的海洋年度CO 2脱气,净中性CO 2流量为−缅因湾为0.09±0.16 mol C m -2  yr -1,大堤岸为-0.88±0.4 mol C m -2  yr -1
更新日期:2021-02-25
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