THE EFFECT OF CONTINENTAL AIR-MASS ON THE MODIFICATION OF INDIVIDUAL SEA-SALT PARTICLES COLLECTED OVER THE COAST AND THE OPEN SEA

被引：13

作者：

MIURA, K

KUMAKURA, T

SEKIKAWA, T

机构：

[1] Department of Physics, Science University of Tokyo, 1-3, Kagurazaka, Shinjuku-ku, Tokyo

来源：

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN | 1991年 / 69卷 / 04期

关键词：

D O I：

10.2151/jmsj1965.69.4_429

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Measurement of aerosol particles was performed over the North Pacific Ocean and the North Atlantic Ocean during two expeditions of the R/V Hakuho-Maru to investigate the modification of individual sea-salt particles. The analyzed results of individual particles with a scanning electron microscope and an energy dispersive X-ray spectrometer are as follows: (1) The Cl/Na mass ratios of square-shaped particles are nearly equal to the value of seawater (1.8), regardless of the particle size. (2) The Cl/Na ratios decrease with increasing the mass fraction of non sea-salt (excess) S in association with the change in shape on the collecting surface from square to circular or irregular. (3) From the relative mass ratios of Na, S and Cl, it is evident that the modified sea-salt particles contain not only Na2SO4 but also other compounds, for example NaNO3, as suggested by previous researchers. (4) The degree of modification over the sea is not dependent on the distance from the shore but on the transport time period, implying that the modification of sea-salt particles collected over the open seas is affected by the transport of the continental air mass. (5) It is found that the modification of the sea-salt particles is closely related to the concentration level of Aitken particles. There is no modification where the concentration of Aitken particles is less than about 400/cm3.

引用

页码：429 / 438

页数：10

共 28 条

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