Asian dust transport during the last century recorded in Lake Suigetsu sediments

Kana Nagashima, Yoshiaki Suzuki, Tomohisa Irino, Takeshi Nakagawa, Ryuji Tada, Yukari Hara, Kazuyoshi Yamada, Yasunori Kurosaki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2835-2842
Number of pages8
JournalGeophysical Research Letters
Volume43
Issue number6
DOIs
Publication statusPublished - Mar 28 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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