共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
Tertia M.C. Hughes 《Dynamics of Atmospheres and Oceans》1997,25(4):273-275
10.
11.
12.
13.
J.S.A. Green 《Dynamics of Atmospheres and Oceans》1984,8(2):215
14.
15.
16.
17.
Prashant Kumar Paul S. Fennell Allan N. Hayhurst Rex E. Britter 《Boundary-Layer Meteorology》2009,131(1):3-18
Dispersion of particles, as evidenced by changes in their number distributions (PNDs) and concentrations (PNCs), in urban
street canyons, is still not well understood. This study compares measurements by a fast-response particle spectrometer (DMS500)
of the PNDs and the PNCs (5–1000 nm, sampled at 1 Hz) at street and rooftop levels in a Cambridge UK street canyon, and examines
mixing, physical and chemical conversion processes, and the competing influences of traffic volume and rooftop wind speed
on the PNDs and the PNCs in various size ranges. PNCs at street level were ≈6.5 times higher than at rooftop. Street-level
PNCs followed the traffic volume and decreased with increasing wind speed, showing a larger influence of wind speed on 30–300 nm
particles than on 5–30 nm particles. Conversely, rooftop PNCs in the 5–30 nm size range increased with wind speed, whereas
those for particles between 30 and 300 nm did not vary with wind speed. 相似文献
18.
19.