Recent changes to Arctic river discharge.
Recent changes to Arctic river discharge.
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DOI：
10.1038/s41467-021-27228-1
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发表时间：
2021-11-25
影响因子：
16.6
通讯作者：
Ishitsuka Y
中科院分区：
文献类型：
--
作者：
Feng D;Gleason CJ;Lin P;Yang X;Pan M;Ishitsuka Y
北极河流流经全球约15%的陆地表面，对当地社区和经济、淡水和海洋生态系统以及全球气候产生重大影响。然而，公众对泛北极河流的了解不足，特别是对小型河流和欧亚大陆的了解不足，这阻碍了人们对北极应对气候变化的了解。在这里，我们计算了1984-2018年486，493条泛北极河流的日流量，将155，710张卫星图像中的918万条河流流量估计值同化到水文模型模拟中。我们揭示了更大的和更异质的总水出口（3-17%以上）和水出口加速（1.2-3.3倍以上）比以前报道的，流域，生态区，河流秩序，人类调节和永久冻土制度之间的重大差异。我们还发现，在春季的淡水和夏季流滞流显着的变化。最终，我们的研究结果代表了最新的，公开的，更准确的日常了解北极河流独特的水文建模和遥感的最新进展。作者将联合收割机卫星数据与水文模型相结合，调查了近50万条河流的泛北极河流流量大小、趋势和季节性的近期变化。这些河流向全球海洋输出的水量可能比1984-2018年之前认为的多3-17%。
Arctic rivers drain ~15% of the global land surface and significantly influence local communities and economies, freshwater and marine ecosystems, and global climate. However, trusted and public knowledge of pan-Arctic rivers is inadequate, especially for small rivers and across Eurasia, inhibiting understanding of the Arctic response to climate change. Here, we calculate daily streamflow in 486,493 pan-Arctic river reaches from 1984-2018 by assimilating 9.18 million river discharge estimates made from 155,710 satellite images into hydrologic model simulations. We reveal larger and more heterogenous total water export (3-17% greater) and water export acceleration (factor of 1.2-3.3 larger) than previously reported, with substantial differences across basins, ecoregions, stream orders, human regulation, and permafrost regimes. We also find significant changes in the spring freshet and summer stream intermittency. Ultimately, our results represent an updated, publicly available, and more accurate daily understanding of Arctic rivers uniquely enabled by recent advances in hydrologic modeling and remote sensing. The authors combine satellite data with hydrologic models to investigate recent changes in pan-Arctic river discharge magnitude, trends, and seasonality for nearly half a million rivers. They reveal that these rivers likely exported 3-17% more water to the global ocean than previously thought from 1984-2018.
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DOI：
10.1073/pnas.1317606111
发表时间：
2014-04-01
影响因子：
11.1
作者：
Gleason, Colin J.;Smith, Laurence C.
通讯作者：
Smith, Laurence C.
影响因子：
5.4
作者：
Ishitsuka, Yuta;Gleason, Colin J.;Pavelsky, Tamlin M.
通讯作者：
Pavelsky, Tamlin M.
影响因子：
5.2
作者：
Allen, George H.;David, Cedric H.;Famiglietti, James S.
通讯作者：
Famiglietti, James S.
影响因子：
13.5
作者：
Gorelick, Noel;Hancher, Matt;Moore, Rebecca
通讯作者：
Moore, Rebecca
影响因子：
4.4
作者：
Adam, Jennifer C.;Haddeland, Ingjerd;Lettenmaier, Dennis P.
通讯作者：
Lettenmaier, Dennis P.