摘要
于1986年10—12月和1987年9—11月分别在西太平洋热带海域(5°N—6°S,21—3°N)作巨盐核观测,资料分析结果表明,10°N以北海域大气中巨盐核浓度大于赤道海域。海洋虽是巨盐核的源地,但其浓度却低于沿海和海岛。而高于内陆。无论是内陆,还是海洋和沿海,大气中的巨盐核浓度都与风向风速有关。在陆地和沿海,相对湿度对巨盐核浓度影响较大,而在海洋地区这种影响并不明显。
The concentrations of giant salt nuclei (≥2μm in diameters) were measured on board ship from October to December, 1986 and from September to November, 1987, over Tropical Western Pacific Area (5°N-6°S, 130-150°E and 21-3°N, 120-135°E respectively). The main results are as follows.1. The average number concentrations of sea salt particles increase with increasing in latitude. It is well known that the main contribution for producing sea salt particles is from larger wind speed. According to the statistics, the frequency of wind speeds larger than 6m/s in higher latitude is higher than that in low latitude, which is responsible for the feature of concentration distribution mentioned above.2. The average concentration of salt particles (146L-1) over 21-3°N sea area is larger than that over inland continent such as Beijing (119L-1), and Tunxi (50L-1), Anhui Province, but less than those over shore and island, such as Dalian (763L-1), Liaoning Province, Putuo (591L-1), Zhiejiang Province and Haiyang island (847L-1), Liaoning Province, China.3. Wave splash and bubble bursting on sea surface are the main mechanism of producing salt particles. When the wind speeds increase from 0-3ms-1 to over 8ms-1, the concentrations increase correspondingly from 95.7L-1 to 379.6L-1 in 3-21°N ocean area.Near the equator when the direction of wind is in 0-180° the concentration of sea salt is twice larger than that in 180-360°In the north of this ocean area, the concentration of sea salt is high when the direction of wind is in 0-90°.In contract with over ocean surface, the concentrations of salt particles over inland continent decrease with increasing in wind speed and the extent of change in concentrations is related to the wind direction.The concentrations of giant salt nuclei increase with increaing in humidity over inland continent, the extent of increase over island is small in comparison to that over inland continent, and the concentrations are not much related to humidity over this sea area.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第6期534-539,共6页
Oceanologia Et Limnologia Sinica
