On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation
Equipping sensors on the lunar surface would enable the capture of Earth’s outgoing longwave radiation (OLR) from nearly an entire hemisphere. However, the Earth’s nonsphericity would profoundly impact the observational solid angle, thereby influencing the disk-integrated Earth OLR estimation. This...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/ada4b4 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832095376647127040 |
|---|---|
| author | Hanlin Ye Huadong Guo Dong Liang Zhen Xu Yin Jin Guang Liu |
| author_facet | Hanlin Ye Huadong Guo Dong Liang Zhen Xu Yin Jin Guang Liu |
| author_sort | Hanlin Ye |
| collection | DOAJ |
| description | Equipping sensors on the lunar surface would enable the capture of Earth’s outgoing longwave radiation (OLR) from nearly an entire hemisphere. However, the Earth’s nonsphericity would profoundly impact the observational solid angle, thereby influencing the disk-integrated Earth OLR estimation. This study analyzes the impact of the Earth’s ellipsoidal shape on the OLR estimation by examining the effects of the observational solid angle. In particular, an expansion-series-based method is proposed for calculating the observational solid angle, avoiding complex numerical integration. Three critical issues are analyzed. (1) Comparing the observational solid angles calculated by using an Earth ellipsoidal model versus those obtained by adjusting the Earth’s radius. We find that adjusting the Earth’s radius can approximate the results based on an Earth ellipsoidal model, offering insights into parameterizing the observational solid angle. (2) Parameterizing the observational solid angle through series expansion, which is validated by comparing the associated results to those from numerical integrations. The observational solid angle is parameterized into two components: one is attributable to a variable Earth radius and another is related to the nadir point’s latitude and the Earth–Moon distance. (3) Guiding parameter selection for observational solid angle estimation. These findings enhance our understanding of disk-integrated Earth OLR estimates and provide a unique tool for establishing benchmarks for the Earth samples needed in the study of habitable planets, thereby contributing to sustainable development. |
| format | Article |
| id | doaj-art-0cfa77a59afe47abb466db4880c8eb7a |
| institution | Kabale University |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj-art-0cfa77a59afe47abb466db4880c8eb7a2025-02-05T18:04:57ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01169312310.3847/1538-3881/ada4b4On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave RadiationHanlin Ye0Huadong Guo1Dong Liang2Zhen Xu3Yin Jin4Guang Liu5International Center for Climate and Environment Science, Institute of Atmospheric Physics , Chinese Academy of Sciences, Beijing 100029, People’s Republic of ChinaInternational Research Center of Big Data for Sustainable Developement Goals, Beijing 100094, People’s Republic of China ; hdguo@radi.ac.cn; Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences , Beijing 100094, People’s Republic of ChinaInternational Research Center of Big Data for Sustainable Developement Goals, Beijing 100094, People’s Republic of China ; hdguo@radi.ac.cn; Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences , Beijing 100094, People’s Republic of ChinaDepartment of Electronic and Information Engineering, Shantou University , Shantou 515063, People’s Republic of ChinaInternational Research Center of Big Data for Sustainable Developement Goals, Beijing 100094, People’s Republic of China ; hdguo@radi.ac.cn; Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences , Beijing 100094, People’s Republic of ChinaInternational Research Center of Big Data for Sustainable Developement Goals, Beijing 100094, People’s Republic of China ; hdguo@radi.ac.cn; Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences , Beijing 100094, People’s Republic of ChinaEquipping sensors on the lunar surface would enable the capture of Earth’s outgoing longwave radiation (OLR) from nearly an entire hemisphere. However, the Earth’s nonsphericity would profoundly impact the observational solid angle, thereby influencing the disk-integrated Earth OLR estimation. This study analyzes the impact of the Earth’s ellipsoidal shape on the OLR estimation by examining the effects of the observational solid angle. In particular, an expansion-series-based method is proposed for calculating the observational solid angle, avoiding complex numerical integration. Three critical issues are analyzed. (1) Comparing the observational solid angles calculated by using an Earth ellipsoidal model versus those obtained by adjusting the Earth’s radius. We find that adjusting the Earth’s radius can approximate the results based on an Earth ellipsoidal model, offering insights into parameterizing the observational solid angle. (2) Parameterizing the observational solid angle through series expansion, which is validated by comparing the associated results to those from numerical integrations. The observational solid angle is parameterized into two components: one is attributable to a variable Earth radius and another is related to the nadir point’s latitude and the Earth–Moon distance. (3) Guiding parameter selection for observational solid angle estimation. These findings enhance our understanding of disk-integrated Earth OLR estimates and provide a unique tool for establishing benchmarks for the Earth samples needed in the study of habitable planets, thereby contributing to sustainable development.https://doi.org/10.3847/1538-3881/ada4b4Earth (planet)Earth atmosphereHabitable planetsRemote sensingExoplanet detection methods |
| spellingShingle | Hanlin Ye Huadong Guo Dong Liang Zhen Xu Yin Jin Guang Liu On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation The Astronomical Journal Earth (planet) Earth atmosphere Habitable planets Remote sensing Exoplanet detection methods |
| title | On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation |
| title_full | On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation |
| title_fullStr | On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation |
| title_full_unstemmed | On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation |
| title_short | On the Observational Solid Angle in Estimating the Moon-based Disk-integrated Earth Outgoing Longwave Radiation |
| title_sort | on the observational solid angle in estimating the moon based disk integrated earth outgoing longwave radiation |
| topic | Earth (planet) Earth atmosphere Habitable planets Remote sensing Exoplanet detection methods |
| url | https://doi.org/10.3847/1538-3881/ada4b4 |
| work_keys_str_mv | AT hanlinye ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation AT huadongguo ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation AT dongliang ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation AT zhenxu ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation AT yinjin ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation AT guangliu ontheobservationalsolidangleinestimatingthemoonbaseddiskintegratedearthoutgoinglongwaveradiation |