Open AccessRelationship between aerosol number concentrations and convergence fields in winter monsoon seasons
Author(s) -
Kikuchi Katsuhiro,
Matsuoka Seiki,
Uyeda Hiroshi,
Kikuchi Osamu,
Lee DongIn
Publication year - 2003
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2001jd001271
Subject(s) - aerosol , snow , environmental science , atmospheric sciences , bay , wind speed , monsoon , climatology , sea spray , geology , meteorology , oceanography , geography
Observations of snow clouds and the number concentrations of aerosol particles were conducted during two winter seasons, at Rebun Island in 1991 and at Ishikari Bay in 1992 on the west coast of Hokkaido, Japan. A significant increase of 1 to 2 orders of magnitude in the number concentration of relatively large aerosol particles was recorded in several 10‐min intervals during the observation period. However, there was only a poor direct correlation between the number concentrations of large particles greater than 0.5 μm in diameter and wind speed. In contrast, the increase in number concentration was correlated with a convergence field calculated by the velocity azimuth display method using a Doppler radar. These results imply that the large and giant aerosol particles, including sea‐salt nuclei which were generated by wind stress near the sea surface under winter monsoon periods, which is known as a typical pressure pattern of “west‐high and east‐low” (as shown in Figure 2), were transported and were then gathered under the convergence field of unstable/convective meteorological systems with developing cumulus cloud cells.