TY - JOUR
T1 - Effects of Earth curvature on atmospheric correction for ocean color remote sensing
AU - He, Xianqiang
AU - Stamnes, Knut
AU - Bai, Yan
AU - Li, Wei
AU - Wang, Difeng
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/5
Y1 - 2018/5
N2 - In this study, a vector radiative transfer model for the coupled ocean-atmosphere system with consideration of the effects of Earth curvature (named PCOART-SA) was developed using the pseudo-spherical approximation. Both downward and reflected solar beam radiation were corrected accounting for Earth curvature effects. Validation showed that the PCOART-SA results agreed well with literature benchmarks and the CDISORT and AccuRT model results. Based on PCOART-SA, Earth curvature effects on Rayleigh-scattering radiance including polarization were investigated. The results showed that the influence of Earth curvature increased rapidly with solar zenith angle, with influences up to 1%, 3%, and 12% for solar zenith angles at 75°, 80°, and 85°, respectively, which should be considered for high accuracy atmospheric correction. We also found that the Rayleigh-scattering look-up table in SeaDAS after version 7.2 showed significant bias at high solar zenith angles, which needs further investigation. Finally, using the PCOART-SA model, we generated Rayleigh-scattering look-up tables for Aqua/MODIS with consideration of Earth curvature effects, which can be directly used in SeaDAS.
AB - In this study, a vector radiative transfer model for the coupled ocean-atmosphere system with consideration of the effects of Earth curvature (named PCOART-SA) was developed using the pseudo-spherical approximation. Both downward and reflected solar beam radiation were corrected accounting for Earth curvature effects. Validation showed that the PCOART-SA results agreed well with literature benchmarks and the CDISORT and AccuRT model results. Based on PCOART-SA, Earth curvature effects on Rayleigh-scattering radiance including polarization were investigated. The results showed that the influence of Earth curvature increased rapidly with solar zenith angle, with influences up to 1%, 3%, and 12% for solar zenith angles at 75°, 80°, and 85°, respectively, which should be considered for high accuracy atmospheric correction. We also found that the Rayleigh-scattering look-up table in SeaDAS after version 7.2 showed significant bias at high solar zenith angles, which needs further investigation. Finally, using the PCOART-SA model, we generated Rayleigh-scattering look-up tables for Aqua/MODIS with consideration of Earth curvature effects, which can be directly used in SeaDAS.
KW - Atmospheric correction
KW - High solar zenith angle
KW - Ocean color remote sensing
KW - Radiative transfer
KW - Rayleigh-scattering radiance
UR - http://www.scopus.com/inward/record.url?scp=85042635798&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85042635798&partnerID=8YFLogxK
U2 - 10.1016/j.rse.2018.02.042
DO - 10.1016/j.rse.2018.02.042
M3 - Article
AN - SCOPUS:85042635798
SN - 0034-4257
VL - 209
SP - 118
EP - 133
JO - Remote Sensing of Environment
JF - Remote Sensing of Environment
ER -