Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling
Abstract Four representative two‐stream canopy radiative transfer models were examined and intercompared using the same configuration. Based on the comparison results, two modifications were introduced to the widely used Dickinson‐Sellers model and then incorporated into the Community Land Model (CL...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2017-03-01
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| Series: | Journal of Advances in Modeling Earth Systems |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/2016MS000773 |
| _version_ | 1797736036724375552 |
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| author | Hua Yuan Yongjiu Dai Robert E. Dickinson Bernard Pinty Wei Shangguan Shupeng Zhang Lili Wang Siguang Zhu |
| author_facet | Hua Yuan Yongjiu Dai Robert E. Dickinson Bernard Pinty Wei Shangguan Shupeng Zhang Lili Wang Siguang Zhu |
| author_sort | Hua Yuan |
| collection | DOAJ |
| description | Abstract Four representative two‐stream canopy radiative transfer models were examined and intercompared using the same configuration. Based on the comparison results, two modifications were introduced to the widely used Dickinson‐Sellers model and then incorporated into the Community Land Model (CLM4.5). The modified model was tested against Monte‐Carlo simulations and produced significant improvements in the simulated canopy transmittance and albedo values. In direct comparison with MODIS albedo data, the modified model shows good performance over most snow/ice‐free vegetated areas, especially for regions that are covered by dense canopy. The modified model shows seasonally dependent behavior mainly in the near‐infrared band. Thus, the improvements are not present in all seasons. Large biases are still noticeable in sparsely vegetated areas, in particular for the snow/ice covered regions, that is possibly related to the model, the land surface input data, or even the observations themselves. Further studies focusing on the impact of the seasonal changes in leaf optical properties, the parameterizations for snow/ice covered regions and the case of sparsely vegetated areas, are recommended. |
| first_indexed | 2024-03-12T13:07:45Z |
| format | Article |
| id | doaj.art-dd766596464d45198c206f8025ae19e8 |
| institution | Directory Open Access Journal |
| issn | 1942-2466 |
| language | English |
| last_indexed | 2024-03-12T13:07:45Z |
| publishDate | 2017-03-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Journal of Advances in Modeling Earth Systems |
| spelling | doaj.art-dd766596464d45198c206f8025ae19e82023-08-28T13:36:50ZengAmerican Geophysical Union (AGU)Journal of Advances in Modeling Earth Systems1942-24662017-03-019111312910.1002/2016MS000773Reexamination and further development of two‐stream canopy radiative transfer models for global land modelingHua Yuan0Yongjiu Dai1Robert E. Dickinson2Bernard Pinty3Wei Shangguan4Shupeng Zhang5Lili Wang6Siguang Zhu7School of Atmospheric SciencesSun Yat‐sen UniversityGuangzhou Guangdong ChinaSchool of Atmospheric SciencesSun Yat‐sen UniversityGuangzhou Guangdong ChinaDepartment of Geological SciencesUniversity of Texas at AustinAustin Texas USAEuropean Commission, Joint Research Centre, Directorate for Sustainable Resources, Knowledge for Sustainable Development and Food SecurityIspra, Varese ItalySchool of Atmospheric SciencesSun Yat‐sen UniversityGuangzhou Guangdong ChinaSchool of Atmospheric SciencesSun Yat‐sen UniversityGuangzhou Guangdong ChinaCollege of Global Change and Earth System ScienceBeijing Normal UniversityBeijing ChinaCollege of Global Change and Earth System ScienceBeijing Normal UniversityBeijing ChinaAbstract Four representative two‐stream canopy radiative transfer models were examined and intercompared using the same configuration. Based on the comparison results, two modifications were introduced to the widely used Dickinson‐Sellers model and then incorporated into the Community Land Model (CLM4.5). The modified model was tested against Monte‐Carlo simulations and produced significant improvements in the simulated canopy transmittance and albedo values. In direct comparison with MODIS albedo data, the modified model shows good performance over most snow/ice‐free vegetated areas, especially for regions that are covered by dense canopy. The modified model shows seasonally dependent behavior mainly in the near‐infrared band. Thus, the improvements are not present in all seasons. Large biases are still noticeable in sparsely vegetated areas, in particular for the snow/ice covered regions, that is possibly related to the model, the land surface input data, or even the observations themselves. Further studies focusing on the impact of the seasonal changes in leaf optical properties, the parameterizations for snow/ice covered regions and the case of sparsely vegetated areas, are recommended.https://doi.org/10.1002/2016MS000773vegetation canopy radiative transfertwo‐stream approximationthe Community Land Model |
| spellingShingle | Hua Yuan Yongjiu Dai Robert E. Dickinson Bernard Pinty Wei Shangguan Shupeng Zhang Lili Wang Siguang Zhu Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling Journal of Advances in Modeling Earth Systems vegetation canopy radiative transfer two‐stream approximation the Community Land Model |
| title | Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling |
| title_full | Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling |
| title_fullStr | Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling |
| title_full_unstemmed | Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling |
| title_short | Reexamination and further development of two‐stream canopy radiative transfer models for global land modeling |
| title_sort | reexamination and further development of two stream canopy radiative transfer models for global land modeling |
| topic | vegetation canopy radiative transfer two‐stream approximation the Community Land Model |
| url | https://doi.org/10.1002/2016MS000773 |
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