دورية أكاديمية
The spectral signature of cloud spatial structure in shortwave irradiance
| العنوان: | The spectral signature of cloud spatial structure in shortwave irradiance |
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| المؤلفون: | Song, Shi, Schmidt, K. Sebastian, Pilewskie, Peter, King, Michael D., Heidinger, Andrew K., Walther, Andi, Iwabuchi, Hironobu, Wind, Gala, Coddington, Odele M. |
| بيانات النشر: | Copernicus Publications |
| سنة النشر: | 2016 |
| المجموعة: | Niedersächsisches Online-Archiv NOA (Gottfried Wilhelm Leibniz Bibliothek Hannover) |
| مصطلحات موضوعية: | article, Verlagsveröffentlichung |
| الوصف: | In this paper, we used cloud imagery from a NASA field experiment in conjunction with three-dimensional radiative transfer calculations to show that cloud spatial structure manifests itself as a spectral signature in shortwave irradiance fields – specifically in transmittance and net horizontal photon transport in the visible and near-ultraviolet wavelength range. We found a robust correlation between the magnitude of net horizontal photon transport (H) and its spectral dependence (slope), which is scale-invariant and holds for the entire pixel population of a domain. This was surprising at first given the large degree of spatial inhomogeneity. We prove that the underlying physical mechanism for this phenomenon is molecular scattering in conjunction with cloud spatial structure. On this basis, we developed a simple parameterization through a single parameter ε, which quantifies the characteristic spectral signature of spatial inhomogeneities. In the case we studied, neglecting net horizontal photon transport leads to a local transmittance bias of ±12–19 %, even at the relatively coarse spatial resolution of 20 km. Since three-dimensional effects depend on the spatial context of a given pixel in a nontrivial way, the spectral dimension of this problem may emerge as the starting point for future bias corrections. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | electronic |
| اللغة: | English |
| العلاقة: | Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.htmlTest -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847Test -- 1680-7324; https://doi.org/10.5194/acp-16-13791-2016Test; https://noa.gwlb.de/receive/cop_mods_00043066Test; https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042686/acp-16-13791-2016.pdfTest; https://acp.copernicus.org/articles/16/13791/2016/acp-16-13791-2016.pdfTest |
| DOI: | 10.5194/acp-16-13791-2016 |
| الإتاحة: | https://doi.org/10.5194/acp-16-13791-2016Test https://noa.gwlb.de/receive/cop_mods_00043066Test https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00042686/acp-16-13791-2016.pdfTest https://acp.copernicus.org/articles/16/13791/2016/acp-16-13791-2016.pdfTest |
| حقوق: | uneingeschränkt ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.779D3334 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/acp-16-13791-2016 |
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