Characteristics of dry deposited mineral particles associated with weather conditions in the adjacent sea areas of East China during a cruise in spring 2011--颗粒学报PARTICUOLOGY

Niu, H., Hu, W., Pian, W., Hu, M., & Zhang, D. (2016). Characteristics of dry deposited mineral particles associated with weather conditions in the adjacent sea areas of East China during a cruise in spring 2011. Particuology, 28, 86-92. https://doi.org/10.1016/j.partic.2016.01.013

Characteristics of dry deposited mineral particles associated with weather conditions in the adjacent sea areas of East China during a cruise in spring 2011

Hongya Niu ^{a b}, Wei Hu ^{b c}, Wei Pian ^a, Min Hu ^b, Daizhou Zhang ^c *

a Key Laboratory of Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, China
b State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
c Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto 862-8502, Japan

10.1016/j.partic.2016.01.013

Volume 28, October 2016, Pages 86-92

Received 6 July 2015, Revised 20 January 2016, Accepted 29 January 2016, Available online 31 May 2016, Version of Record 4 August 2016.

E-mail: dzzhang@pu-kumamoto.ac.jp

Highlights

• Dry deposited mineral particles to the adjacent sea areas of East China were analyzed.

• Size distributions of the particles differed in modes with weather conditions.

• Fog favored sulfate formation on the particles but did not cause frequent sea salt adherence.

• There was a non-ignorant dependence of the particles in composition on weather.

Abstract

Dry deposited particles, larger than 1.3 μm, were collected under clear, cloudy, and foggy conditions during a cruise, traversing the Yellow Sea and the East China Sea from 23 March to 8 April 2011. In these areas, air masses are influenced by pollution outflows from the Asian continent. The size and elemental composition of dry deposited particles were investigated using a scanning electron microscope. Number–size distributions of these particles were approximately lognormal. Under clear conditions, the mode size was about 5.0 μm, with a mean diameter of 6.9 μm. Under cloudy and foggy conditions, the mean diameters were 5.7 and 6.0 μm, respectively, but the mode sizes were vague. Non-mixed mineral particles, sea salt, and mixed mineral–sea salt particles were the major particle types. Correspondingly, Al and Si were the most frequently detected elements. Frequencies of K-, Ca-, and S-containing particles were highest under foggy conditions, while the frequency of Na-containing particles was lowest. These results indicate that fog favored sulfate production on the particles and led to the deposited mineral particles more abundant in secondary salt, suggesting the importance to consider the dependence of the composition of deposited mineral particles on weather as well as particle size.

Graphical abstract

Keywords

Dry deposition; Mixture; Sea salt; Sulfate; Single particle analysis; Marine aerosols

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