Title
Developing an Aircraft-Based Angular Distribution Model of Solar Reflection from Wildfire Smoke to Aid Satellite-Based Radiative Flux Estimation.
Abstract
This study examines the angular distribution of scattered solar radiation associated with wildfire smoke aerosols observed over boreal forests in Canada during the ARCTAS (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites) campaign. First, it estimates smoke radiative parameters (550 nm optical depth of 3.9 and single scattering albedo of 0.90) using quasi-simultaneous multiangular and multispectral airborne measurements by the Cloud Absorption Radiometer (CAR). Next, the paper estimates the broadband top-of-atmosphere radiances that a satellite instrument such as the Clouds and the Earth's Radiant Energy System (CERES) could have observed, given the narrowband CAR measurements made from an aircraft circling about a kilometer above the smoke layer. This estimation includes both an atmospheric correction that accounts for the atmosphere above the aircraft and a narrowband-to-broadband conversion. The angular distribution of estimated radiances is found to be substantially different than the angular model used in the operational data processing of CERES observations over the same area. This is because the CERES model is a monthly average model that was constructed using observations taken under smoke-free conditions. Finally, a sensitivity analysis shows that the estimated angular distribution remains accurate for a fairly wide range of smoke and underlying surface parameters. Overall, results from this work suggest that airborne CAR measurements can bring some substantial improvements in the accuracy of satellite-based radiative flux estimates.
Year
DOI
Venue
2019
10.3390/rs11131509
REMOTE SENSING
Keywords
Field
DocType
wildfire,smoke,aerosol,Cloud Absorption Radiometer,angular distribution model
Satellite,Angular distribution,Smoke,Remote sensing,Radiative flux,Geology
Journal
Volume
Issue
Citations 
11
13
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
TamÁs Varnai172.05
Charles K. Gatebe2387.41
Ritesh Gautam300.34
Rajesh Poudyal421.10
Wenying Su501.35