Interannual Variability in the Source Location of North African Dust Transported to the Amazon
Interannual Variability in the Source Location of North African Dust Transported to the Amazon
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DOI：
10.1029/2021gl097344
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发表时间：
2022-05
影响因子：
5.2
通讯作者：
A. Barkley;A. Pourmand;Jack Longman;A. Sharifi;J. Prospero;K. Panechou;Natalie Bakker;N. Drake;D. Guinoiseau;C. Gaston
中科院分区：
文献类型：
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作者：
A. Barkley;A. Pourmand;Jack Longman;A. Sharifi;J. Prospero;K. Panechou;Natalie Bakker;N. Drake;D. Guinoiseau;C. Gaston
每年冬季和春季，非洲的沙尘被输送到南美洲（SA）。假设表明，西非或北非中部（例如，Bodélé凹陷）是输送尘埃的主要来源，但这些概念在很大程度上尚未得到地球化学数据的检验。使用2年的同位素测量（锶和钕）收集在SA的非洲尘埃集成到一个统计模型，我们确定了强大的年际变化的尘埃源区。2016年冬季，北非中部地区提供了44%的远距离输送沙尘，而2014年冬季，西部地区占沙尘的53%。我们建议的变化是由于利比亚高的强度和降水在几内亚湾和大西洋之间的2年的差异。我们的研究结果可以改善灰尘营养沉积的限制，并预测气候变化如何影响输送到亚马逊的灰尘的来源和数量。
African dust is transported to South America (SA) every winter and spring. Hypotheses suggest that either Western or Central North Africa (e.g., Bodélé Depression) is the main source of transported dust, yet these notions remain largely untested with geochemical data. Using 2 years of isotopic measurements (strontium and neodymium) of African dust collected in SA integrated into a statistical model, we identified strong interannual variability in dust source region. Central North Africa supplied 44% of long‐range transported dust in winter 2016 while the Western region accounted for 53% of dust in winter 2014. We propose the variability is due to differences in the strength of the Libyan High and precipitation over the Gulf of Guinea and Atlantic Ocean between the 2 years. Our findings can improve constraints of dust nutrient deposition and predictions of how changes in climate impact the source and magnitude of dust transported to the Amazon.