Asian dust transport during the last century recorded in Lake Suigetsu sediments
Asian dust transport during the last century recorded in Lake Suigetsu sediments
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DOI：
10.1002/2015gl067589
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发表时间：
2016-03
影响因子：
5.2
通讯作者：
K. Nagashima;Yoshiaki Suzuki;T. Irino;T. Nakagawa;R. Tada;Y. Hara;Kazuyoshi Yamada;Y. Kurosaki
中科院分区：
文献类型：
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作者：
K. Nagashima;Yoshiaki Suzuki;T. Irino;T. Nakagawa;R. Tada;Y. Hara;Kazuyoshi Yamada;Y. Kurosaki
亚洲沙尘对自然环境有重大影响。它在多个时间尺度上的变异性调节着海洋生物地球化学和气候。结果表明，上个世纪日本中部水手湖沉积物中记录的风尘沉积通量的时间变化在1952-1974年间呈现出持续减少的趋势和十年尺度的减少。前一种下降趋势可以用20世纪蒙古变暖导致源区沙尘暴频数减少来解释，这表明未来亚洲沙尘输送将随着蒙古进一步变暖而减少。风尘年代际减少的原因是日本中部低纬西风较弱，反映了同期阿留申低压较弱。年代际尺度的西风变化可能导致主要尘埃输送路径的南北移动，从而通过改变微量营养元素的铁供应来影响亚北极北太平洋的生物地球化学。
Asian dust has a significant impact on the natural environment. Its variability on multiple timescales modulates the ocean biogeochemistry and climate. We demonstrate that temporal changes in the deposition flux of Aeolian dust recorded in sediments from Lake Suigetsu, central Japan, during the last century exhibit a continuous decreasing trend and a decadal‐scale decrease in 1952–1974. The former decreasing trend can be explained by a decrease in the dust storm frequency at source regions due to the warming of Mongolia in the twentieth century, suggesting future decrease of Asian dust transport with further warming in Mongolia. Decadal‐scale decrease of Aeolian dust is explained by weaker westerlies in lower latitudes in central Japan, reflecting a weaker Aleutian Low during the corresponding period. Decadal‐scale westerly change probably causes north–south shifts of the dominant dust transport path, which affects subarctic northern Pacific Ocean biogeochemistry by changing the micronutrient iron supply.