The impacts of 3D radiative transfer effects on cloud radiative property simulations and retrievals
| dc.contributor.author | Cui, Yunwei | |
| dc.contributor.author | Gao, Meng | |
| dc.contributor.author | Hottovy, Scott | |
| dc.contributor.author | Rajapakshe, Chamara | |
| dc.contributor.author | Zhang, Zhibo | |
| dc.date.accessioned | 2018-09-10T19:28:03Z | |
| dc.date.available | 2018-09-10T19:28:03Z | |
| dc.date.issued | 2013-02-14 | |
| dc.description.abstract | This paper presents a new method for representing the important effects of horizontal radiation transport through cloud sides in two-stream radiation schemes. Ordinarily, the radiative transfer equations are discretized separately for the clear and cloudy regions within each model level, but here terms are introduced that represent the exchange of radiation laterally between regions and the resulting coupled equations are solved for each layer. This approach may be taken with both the direct incoming shortwave radiation, which is governed by Beer’s law, and the diffuse shortwave and longwave radiation, governed by the two-stream equations. The rate of lateral exchange is determined by the area of cloud “edge.” The validity of the method is demonstrated by comparing with rigorous 3D radiative transfer calculations in the literature for two cloud types in which the 3D effect is strong, specifically cumulus and aircraft contrails. The 3D effect on shortwave cloud radiative forcing varies between around −25% and around +100%, depending on solar zenith angle. Even with an otherwise very simplistic representation of the cloud, the new scheme exhibits good agreement with the rigorous calculations in the shortwave, opening the way for efficient yet accurate representation of this important effect in climate models. | en_US |
| dc.description.sponsorship | This work is supported by the grant CyberTraining: DSE: Cross-Training of Researchers in Computing, Applied Mathematics and Atmospheric Sciences using Advanced Cyberinfrastructure Resources from the National Science Foundation (grant no. OAC–1730250). This grant also supported co-author Chamara Rajapakshe as graduate assistant. The hardware in the UMBC High Performance Computing Facility (HPCF) is supported by the U.S. National Science Foundation through the MRI program (grant nos. CNS– 0821258, CNS–1228778 , and OAC–1726023) and the SCREMS program (grant no. DMS– 0821311), with additional substantial support from the University of Maryland, Baltimore County (UMBC). See hpcf.umbc.edu for more information on HPCF and the projects using its resources. | en_US |
| dc.description.uri | https://userpages.umbc.edu/~gobbert/papers/CT2018Team5.pdf | en_US |
| dc.format.extent | 22 pages | en_US |
| dc.genre | Technical Report | en_US |
| dc.identifier | doi:10.13016/M2WS8HQ28 | |
| dc.identifier.citation | Robin J. Hogan and Jonathan K. P. Shonk, Incorporating the Effects of 3D Radiative Transfer in the Presence of Clouds into Two-Stream Multilayer Radiation Schemes, Journal of the Atmospheric Sciences 2013, Volume 70 | en_US |
| dc.identifier.uri | https://doi.org/10.1175/JAS-D-12-041.1 | |
| dc.identifier.uri | http://hdl.handle.net/11603/11271 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | American Meteorological Society (ACM) | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.relation.ispartof | UMBC Student Collection | |
| dc.relation.ispartofseries | HPCF Technical Report;HPCF-2018-15 | |
| dc.rights | This item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author. | |
| dc.subject | UMBC High Performance Computing Facility (HPCF) | en_US |
| dc.subject | MODIS cloud | en_US |
| dc.subject | cloud effective radius (CER) | en_US |
| dc.subject | cloud optical thickness (COT) | en_US |
| dc.subject | liquid water path (LWP) | en_US |
| dc.title | The impacts of 3D radiative transfer effects on cloud radiative property simulations and retrievals | en_US |
| dc.type | Text | en_US |