REAL-TIME, INSITU MEASUREMENTS OF ATMOSPHERIC OPTICAL-ABSORPTION IN THE VISIBLE VIA PHOTOACOUSTIC-SPECTROSCOPY .4. VISIBILITY DEGRADATION AND AEROSOL OPTICAL-PROPERTIES IN LOS-ANGELES

被引：28

作者：

ADAMS, KM ^{[1
]}

DAVIS, LI ^{[1
]}

JAPAR, SM ^{[1
]}

FINLEY, DR ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT ATMOSPHER OCEAN & SPACE RES,ANN ARBOR,MI 48109

来源：

ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS | 1990年 / 24卷 / 03期

关键词：

Atmospheric carbon; atmospheric optics; black carbon; elemental carbon; light absorption; optical absorption; particulate carbon; photoacoustic; spectrophone; visibility;

D O I：

10.1016/0960-1686(90)90015-F

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Aerosol light absorption (babs) has been measured in real-time in Los Angeles with a validated photoacoustic technique, and its impact on visibility degradation has been examined. These measurements were collected during ten days in the summer of 1987 for the Southern California Air Quality Study (SCAQS). Aerosol babs (λ = 514.5 nm) varied from an hourly average value of 7 × 10-6 m-1 in the 3-4 and 4-5 a.m. periods of 13 July to 9 × 10-5 m-1 in the 7-8 a.m. period of both 28 August and 3 September. This babs, which is due solely to elemental carbon (EC) showed a distinct diurnal pattern with low values at night, increasing around sunrise to higher values through mid-afternoon. Comparison of these data with aerosol light scattering data clearly illustrates that the contribution of aerosol light absorption to visibility degradation increases in importance under less polluted conditions. Other urban and rural studies show similar results. © 1990.

引用

页码：605 / 610

页数：6