Climate change in the Antarctic over the past 50+ years has caused contraction of ice and snow cover, longer melt seasons and intensified glacier melting. These changes affect erosion and sediment redistribution processes that are vital to our understanding of terrestrial and freshwater ecosystems and sediment input to oceans. This 79 day study of the Orwell Glacier meltwater stream on Signy Island (5 December 2019–21 February 2020) used 5 min recordings of turbidity, stream discharge (Q) and air temperature (AT), supplemented by 454 water samples from which suspended sediment concentration (SSC) was gravimetrically determined, to calculate daily suspended sediment loads (SSLs). Qmean was 47.8 ± 3.5 l s-1, SSCmean was 71.0 ± 15.9 mg l-1 and daily SSLmean was 75 ± 8 kg day-1 with a suspended sediment yield of 43.6 t km-2 yr-1. A multiple regression model predicted SSLs reliably (multiple r = 0.95, r2 = 0.91, n = 79) and, when run with ATmean + 1°C (expected on Signy Island by 2060) and ATmean + 2°C (expected by 2100) scenarios, the model predicted 7% and 13% increases in SSLs, respectively. The SSLs estimated in this study are low when compared with others from around the world.

中文翻译：

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南极洲西尼岛奥威尔冰川前冰川流的季节性水文和悬浮泥沙输送动力学及其未来建模

过去 50 多年南极气候变化导致冰雪覆盖收缩、融化季节延长和冰川融化加剧。这些变化影响侵蚀和沉积物再分配过程，这对于我们了解陆地和淡水生态系统以及输入海洋的沉积物至关重要。这项对西尼岛奥威尔冰川融水流的为期 79 天的研究（2019 年 12 月 5 日至 2020 年 2 月 21 日）使用了 5 分钟的浊度、河流流量 (Q) 和气温 (AT) 记录，并辅以 454 个水样，其中悬浮沉积物通过重量法测定浓度（SSC），以计算每日悬浮沉积物负荷（SSLs）。问意思是为 47.8 ± 3.5 ls-1, SSC意思是为 71.0 ± 15.9 毫克/升-1和每日 SSL意思是为 75 ± 8 公斤/天-1悬浮产沙量 43.6 t·km-2年-1. 多元回归模型可靠地预测 SSL（多个r= 0.95,r2= 0.91,n= 79)，并且当使用 AT 运行时意思是+ 1°C（预计到 2060 年在 Signy Island）和 AT意思是+ 2°C（预计到 2100 年）情景下，该模型预测 SSL 分别增加 7% 和 13%。与世界各地的其他人相比，本研究中估计的 SSL 较低。