The Dust Deposition Process and Biogeochemical Impacts in the Northern South China Sea
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ORIGINAL ARTICLE
The Dust Deposition Process and Biogeochemical Impacts in the Northern South China Sea Shuhuan Du 1,2
&
G. M. Ariful Islam 1,2,3 & Rong Xiang 1,2 & Xiaoli Yang 4
Received: 21 July 2019 / Revised: 22 November 2019 / Accepted: 31 December 2019 # Korean Meteorological Society and Springer Nature B.V. 2020
Abstract Modern dust plays essential roles in marine sediments, providing nutrient and crucial elements for primary productivity and aquatic ecosystems. However, present marine atmospheric dust observational evidence concerning the biogeochemical response to dust deposition process is spared for a long time. Here a total of 147 aerosols samples were collected near the northern South China Sea (SCS) coast between 13 February, 2016, and 12 February, 2017, have been investigated for the grain size distribution, depositional flux, ten-day back trajectories, clusters analysis, combining with primary productivity (Chlorophyll-a concentration) to indicate the present-day dust deposition process and biogeochemical impacts in the northern SCS on the first time. Our results illustrate the deposition flux and grain size distribution change in different season, grain size distribution in winter are coarser particles than that in the summer, while the maximum and minimum dry deposition flux are 12 December, 2016, (60.4 mg m−2 d−1) and 26 August, 2016, (5 mg m−2 d−1), respective. In addition, the back trajectories and three clusters analyze results indicating 53% of air masses originating locally near the coastal areas of China from the marine boundary layer (0–0.5 km) in the summer monsoon, while 48% dust from the northeast wind is prevailing during the winter monsoon over a relatively higher level (0–1.5 km). Furthermore, an apparent Chl-a blooming after aeolian dust input with a period of 1–2 days in the SCS. Therefore, atmospheric dust contains readily bioavailable iron and enhance the biogeochemical impact in the oligotrophic SCS. Keywords Atmospheric dust . Grain size contribution . Deposition flux . Chlorophyll-a concentration . Biogeochemical impacts
1 Introduction Modern aerosol can affect the climate directly by modifying cloud formations and precipitation processes, while the dust Responsible Editor: Soon-Il An. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13143-019-00171-4) contains supplementary material, which is available to authorized users. * Shuhuan Du [email protected] 1
CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
2
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
4
School of Resource Environment and Earth Sciences, Yunnan University, Kunming 650500, China
deposited on the oceans become a significant component of marine sediments, and provide important elements for p
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