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Article: Characterization of Remote Sensing Albedo Over Sloped Surfaces Based on DART Simulations and In Situ Observations

TitleCharacterization of Remote Sensing Albedo Over Sloped Surfaces Based on DART Simulations and In Situ Observations
Authors
Keywordsalbedo
DART
ground measurement
remote sensing
rugged sloped surface
terrain
Issue Date2018
Citation
Journal of Geophysical Research: Atmospheres, 2018, v. 123, n. 16, p. 8599-8622 How to Cite?
AbstractIn situ albedo measurement over sloped surfaces is pivotal to a wide range of remote sensing applications, such as the estimation and evaluation of surface energy budget at regional and global scales. However, existing albedo measurements over rugged terrain are limited and controversial and remain a major challenge. In this paper, two commonly measured broadband albedos, which depend on incoming/outgoing geometric conditions, were characterized over sloped surfaces and illustrated. These albedos are the horizontal/horizontal sloped surface albedo (HHSA) and inclined/inclined sloped surface albedo (IISA). The 3-D Discrete Anisotropic Radiative Transfer (DART) model simulations over varying slopes were utilized to quantify differences in the albedos. In particular, the effects of the slope, aspect, the solar zenith angle, and the proportion of diffuse skylight were investigated. The results show that absolute (relative) biases between HHSA and IISA are significant, reaching up to 0.026 (61.8%), 0.134 (62.4%), and 0.114 (62.3%) in the visible, near-infrared, and shortwave broadbands, respectively. In addition, the diurnal cycle differences between HHSA and IISA were also compared using DART simulations and in situ observations over four typical slopes. Comparisons reveal that topographic parameters (e.g., slope and aspect) and atmospheric conditions (e.g., diffuse skylight and atmospheric visibility) are the primary factors, while the optical and structural parameters have a smaller effect.
Persistent Identifierhttp://hdl.handle.net/10722/327202
ISSN
2023 Impact Factor: 3.8
2023 SCImago Journal Rankings: 1.710
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, Shengbiao-
dc.contributor.authorWen, Jianguang-
dc.contributor.authorYou, Dongqin-
dc.contributor.authorHao, Dalei-
dc.contributor.authorLin, Xingwen-
dc.contributor.authorXiao, Qing-
dc.contributor.authorLiu, Qinhuo-
dc.contributor.authorGastellu-Etchegorry, Jean Philippe-
dc.date.accessioned2023-03-31T05:29:41Z-
dc.date.available2023-03-31T05:29:41Z-
dc.date.issued2018-
dc.identifier.citationJournal of Geophysical Research: Atmospheres, 2018, v. 123, n. 16, p. 8599-8622-
dc.identifier.issn2169-897X-
dc.identifier.urihttp://hdl.handle.net/10722/327202-
dc.description.abstractIn situ albedo measurement over sloped surfaces is pivotal to a wide range of remote sensing applications, such as the estimation and evaluation of surface energy budget at regional and global scales. However, existing albedo measurements over rugged terrain are limited and controversial and remain a major challenge. In this paper, two commonly measured broadband albedos, which depend on incoming/outgoing geometric conditions, were characterized over sloped surfaces and illustrated. These albedos are the horizontal/horizontal sloped surface albedo (HHSA) and inclined/inclined sloped surface albedo (IISA). The 3-D Discrete Anisotropic Radiative Transfer (DART) model simulations over varying slopes were utilized to quantify differences in the albedos. In particular, the effects of the slope, aspect, the solar zenith angle, and the proportion of diffuse skylight were investigated. The results show that absolute (relative) biases between HHSA and IISA are significant, reaching up to 0.026 (61.8%), 0.134 (62.4%), and 0.114 (62.3%) in the visible, near-infrared, and shortwave broadbands, respectively. In addition, the diurnal cycle differences between HHSA and IISA were also compared using DART simulations and in situ observations over four typical slopes. Comparisons reveal that topographic parameters (e.g., slope and aspect) and atmospheric conditions (e.g., diffuse skylight and atmospheric visibility) are the primary factors, while the optical and structural parameters have a smaller effect.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research: Atmospheres-
dc.subjectalbedo-
dc.subjectDART-
dc.subjectground measurement-
dc.subjectremote sensing-
dc.subjectrugged sloped surface-
dc.subjectterrain-
dc.titleCharacterization of Remote Sensing Albedo Over Sloped Surfaces Based on DART Simulations and In Situ Observations-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1029/2018JD028283-
dc.identifier.scopuseid_2-s2.0-85052796252-
dc.identifier.volume123-
dc.identifier.issue16-
dc.identifier.spage8599-
dc.identifier.epage8622-
dc.identifier.eissn2169-8996-
dc.identifier.isiWOS:000445331900013-

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