Recent trends in the chemistry of major northern rivers signal widespread Arctic change
Recent trends in the chemistry of major northern rivers signal widespread Arctic change
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DOI：
10.1038/s41561-023-01247-7
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发表时间：
2023-08
影响因子：
18.3
通讯作者：
S. Tank;J. McClelland;R. Spencer;A. Shiklomanov;A. Suslova;F. Moatar;R. Amon;L. Cooper;Greg Elias;V. Gordeev;C. Guay;T. Gurtovaya;L. Kosmenko;E. Mutter;B. Peterson;B. Peucker‐Ehrenbrink;P. Raymond;P. Schuster;L. Scott;R. Staples;R. Striegl;M. Tretiakov;A. Zhulidov;N. Zimov;S. Zimov;R. Holmes
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文献类型：
--
作者：
S. Tank;J. McClelland;R. Spencer;A. Shiklomanov;A. Suslova;F. Moatar;R. Amon;L. Cooper;Greg Elias;V. Gordeev;C. Guay;T. Gurtovaya;L. Kosmenko;E. Mutter;B. Peterson;B. Peucker‐Ehrenbrink;P. Raymond;P. Schuster;L. Scott;R. Staples;R. Striegl;M. Tretiakov;A. Zhulidov;N. Zimov;S. Zimov;R. Holmes
河流整合了整个流域发生的过程，因此是广阔空间范围内变化的哨兵。河流化学还调节整个地球陆地-海洋连续体的生态系统功能，从微观(例如，本地食物网)到宏观(例如，全球碳循环)实施控制。在迅速变暖的北极，一系列的过程--从永久冻土融化到生物吸收和转化--可能合理地改变河水化学。在这里，我们使用主要河流的数据，这些河流总共排出了北冰洋三分之二的分水岭，以评估从2003年到2019年泛北冰洋盆地内生物地球化学功能的广泛变化。在这段时间内，碱度和相关离子向海洋的通量显著增加，而硝酸盐和其他无机营养物质通量却下降。溶解有机碳通量没有总体趋势。这种响应的差异表明陆地上的多个过程的扰动，对沿海海洋的生物地球化学循环产生了影响。我们预计，这些发现将有助于完善北极沿海生态系统当前和未来功能的概念和数字模型，并推动对整个河流综合北极领域规模依赖变化的研究。
Rivers integrate processes occurring throughout their watersheds and are therefore sentinels of change across broad spatial scales. River chemistry also regulates ecosystem function across Earth’s land–ocean continuum, exerting control from the micro- (for example, local food web) to the macro- (for example, global carbon cycle) scale. In the rapidly warming Arctic, a wide range of processes—from permafrost thaw to biological uptake and transformation—might reasonably alter river water chemistry. Here we use data from major rivers that collectively drain two-thirds of the Arctic Ocean watershed to assess widespread change in biogeochemical function within the pan-Arctic basin from 2003 to 2019. While the oceanward flux of alkalinity and associated ions increased markedly over this time frame, nitrate and other inorganic nutrient fluxes declined. Fluxes of dissolved organic carbon showed no overall trend. This divergence in response indicates the perturbation of multiple processes on land, with implications for biogeochemical cycling in the coastal ocean. We anticipate that these findings will facilitate refinement of conceptual and numerical models of current and future functioning of Arctic coastal ecosystems and spur research on scale-dependent change across the river-integrated Arctic domain.