An extensive analysis of low-level IR transmission measurements taken over a 15 km path during EOPACE with IRBLEM

被引：8

作者：

Forand, JL ^{[1
]}

Dion, D ^{[1
]}

Duffy, M ^{[1
]}

Gathman, S ^{[1
]}

Littfin, K ^{[1
]}

de Jong, A ^{[1
]}

de Leeuw, G ^{[1
]}

Davidson, K ^{[1
]}

机构：

[1] Def Res Estab, Val Belair, PQ G3J 1X5, Canada

来源：

PROPAGATION AND IMAGING THROUGH THE ATMOSPHERE II | 1998年 / 3433卷

关键词：

refraction; transmission; marine boundary layer; aerosol extinction; infrared; IRBLEM; EOPACE;

D O I：

10.1117/12.330207

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Results of over 300 far IR and mid IR transmission measurements taken during several EOPACE (EO Propagation Assessment in Coastal Environments) intensive operational periods (IOP's) over the low-level 15 km transmission path across San Diego bay are presented. A thorough comparison with calculations obtained using simultaneously measured bulk meteorological parameters with the IR Boundary Layer Model (IRBLEM), illustrate the effects that refractance, aerosol extinction and molecular extinction can have on the transmission. Discrepancies between the transmission measurements and the model's predictions are identified and investigated by varying various model parameters, and looking at available measured aerosol size distributions and refraction measurements over the path. Comparison with the measured transmissions are reasonably good and show that the total transmission depends critically on all three effects, with the molecular transmittance depending upon the water vapour density and the characteristics of the IR source and detector, the aerosol transmittance upon the visibility (aerosol concentration), and the refractive effects on the stability of the marine boundary layer or the virtual potential air-sea temperature difference.

引用

页码：90 / 101

页数：12