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Tables were constructed at three spectral resolutions (2, 5, and 10 cm−1) with quadrature values (point and weight) and numbers optimized using simulated sky radiances at ground level, which had accuracies of ≤ 0.5% for sub-bands of 10cm−1. Although high-resolution WV-CKD requires numerous quadrature points, the number of executions of the radiative transfer model is reduced to approximately 1/46 of the number used in the line-by-line approach by our WV-CKD with a resolution of 2 cm−1. Furthermore, we confirmed through several simulations that WV-CKD could be used to compute radiances with various vertical profiles. The accuracy of convolved direct solar irradiance and diffuse radiance at a full width at half maximum (FWHM) of 10 nm, computed with the WV-CKD, is \u003c 0.3%. In contrast, the accuracy of convolved normalized radiance, which is the ratio of diffuse radiance to direct solar irradiance, at an FWHM of 10 nm computed with the WV-CKD is \u003c 0.11%. This accuracy is lower than the observational uncertainty of a ground-based angular-scanning radiometer (approximately 0.5%). Finally, we applied the SKYMAP and DSRAD algorithms (Momoi et al. in Atmos Meas Tech 13:2635–2658, 2020. https://doi.org/10.5194/amt-13-2635-2020) to SKYNET observations (Chiba, Japan) and compared the results with microwave radiometer values. The precipitable water vapor (PWV) derived with the WV-CKD showed better agreement (correlation coefficient γ = 0.995, slope = 1.002) with observations than PWV derived with the previous CKD table (correlation coefficient γ = 0.984, slope = 0.926) by Momoi et al. (Momoi et al., Atmos Meas Tech 13:2635–2658, 2020). Through application of the WV-CKD to actual data analysis, we found that an accurate CKD table is essential for estimating PWV from sky-radiometer observations.", "subitem_description_type": "Abstract"}]}, "item_3_publisher_32": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "Springer Nature"}]}, "item_3_relation_11": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_type_id": {"subitem_relation_type_id_text": "https://doi.org/10.1186/s40645-022-00467-6", "subitem_relation_type_select": "DOI"}}]}, "item_3_relation_13": {"attribute_name": "情報源", "attribute_value_mlt": [{"subitem_relation_name": [{"subitem_relation_name_text": "Publisher\u0027s Version/PDF (OpenAccess)"}], "subitem_relation_type_id": {"subitem_relation_type_id_text": "https://doi.org/10.1186/s40645-022-00467-6", "subitem_relation_type_select": "DOI"}}, {"subitem_relation_name": [{"subitem_relation_name_text": "Springer Nature"}], "subitem_relation_type_id": {"subitem_relation_type_id_text": "https://www.springernature.com/jp", "subitem_relation_type_select": "URI"}}]}, "item_access_right": {"attribute_name": "アクセス権", "attribute_value_mlt": [{"subitem_access_right": "metadata only access", "subitem_access_right_uri": "http://purl.org/coar/access_right/c_14cb"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Momoi, Masahiro"}], "nameIdentifiers": [{"nameIdentifier": "3880", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Irie, Hitoshi"}], "nameIdentifiers": [{"nameIdentifier": "3881", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Sekiguchi, Miho"}], "nameIdentifiers": [{"nameIdentifier": "2460", "nameIdentifierScheme": "WEKO"}, {"nameIdentifier": "00377079", "nameIdentifierScheme": "e-Rad", "nameIdentifierURI": "https://kaken.nii.ac.jp/ja/search/?qm=00377079"}]}, {"creatorNames": [{"creatorName": "Nakajima, Teruyuki"}], "nameIdentifiers": [{"nameIdentifier": "3882", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Takenaka, Hideaki"}], "nameIdentifiers": [{"nameIdentifier": "3883", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Miura, Kazuhiko"}], "nameIdentifiers": [{"nameIdentifier": "3884", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Aoki, Kazuma"}], "nameIdentifiers": [{"nameIdentifier": "3885", "nameIdentifierScheme": "WEKO"}]}]}, "item_keyword": {"attribute_name": "キーワード", "attribute_value_mlt": [{"subitem_subject": "Atmospheric gas absorption", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Correlated k-distribution", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Radiative transfer", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations"}]}, "item_type_id": "3", "owner": "15", "path": ["363", "636"], "permalink_uri": "https://oacis.repo.nii.ac.jp/records/2452", "pubdate": {"attribute_name": "公開日", "attribute_value": "2022-05-17"}, "publish_date": "2022-05-17", "publish_status": "0", "recid": "2452", "relation": {}, "relation_version_is_last": true, "title": ["Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations"], "weko_shared_id": -1}
Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations
https://oacis.repo.nii.ac.jp/records/2452
https://oacis.repo.nii.ac.jp/records/24525cb4f73d-eedd-4c09-9216-b140540a58c5
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-05-17 | |||||
タイトル | ||||||
タイトル | Rapid, accurate computation of narrow-band sky radiance in the 940 nm gas absorption region using the correlated k-distribution method for sun-photometer observations | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | Atmospheric gas absorption, Correlated k-distribution, Radiative transfer | |||||
資源タイプ | ||||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
著者 |
Momoi, Masahiro
× Momoi, Masahiro× Irie, Hitoshi× Sekiguchi, Miho× Nakajima, Teruyuki× Takenaka, Hideaki× Miura, Kazuhiko× Aoki, Kazuma |
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書誌情報 |
Progress in Earth and Planetary Science 巻 9, 号 10, 発行日 2022-01-28 |
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抄録 | ||||||
内容記述 | We developed lookup tables for the correlated k-distribution (CKD) method in the 940 nm water vapor absorption region (WV-CKD), with the aim of rapid and accurate computation of narrow-band radiation around 940 nm (10,000–10,900 cm−1) for ground-based angular-scanning radiometer data analysis. Tables were constructed at three spectral resolutions (2, 5, and 10 cm−1) with quadrature values (point and weight) and numbers optimized using simulated sky radiances at ground level, which had accuracies of ≤ 0.5% for sub-bands of 10cm−1. Although high-resolution WV-CKD requires numerous quadrature points, the number of executions of the radiative transfer model is reduced to approximately 1/46 of the number used in the line-by-line approach by our WV-CKD with a resolution of 2 cm−1. Furthermore, we confirmed through several simulations that WV-CKD could be used to compute radiances with various vertical profiles. The accuracy of convolved direct solar irradiance and diffuse radiance at a full width at half maximum (FWHM) of 10 nm, computed with the WV-CKD, is < 0.3%. In contrast, the accuracy of convolved normalized radiance, which is the ratio of diffuse radiance to direct solar irradiance, at an FWHM of 10 nm computed with the WV-CKD is < 0.11%. This accuracy is lower than the observational uncertainty of a ground-based angular-scanning radiometer (approximately 0.5%). Finally, we applied the SKYMAP and DSRAD algorithms (Momoi et al. in Atmos Meas Tech 13:2635–2658, 2020. https://doi.org/10.5194/amt-13-2635-2020) to SKYNET observations (Chiba, Japan) and compared the results with microwave radiometer values. The precipitable water vapor (PWV) derived with the WV-CKD showed better agreement (correlation coefficient γ = 0.995, slope = 1.002) with observations than PWV derived with the previous CKD table (correlation coefficient γ = 0.984, slope = 0.926) by Momoi et al. (Momoi et al., Atmos Meas Tech 13:2635–2658, 2020). Through application of the WV-CKD to actual data analysis, we found that an accurate CKD table is essential for estimating PWV from sky-radiometer observations. | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1186/s40645-022-00467-6 | |||||
情報源 | ||||||
関連識別子 | https://doi.org/10.1186/s40645-022-00467-6 | |||||
関連名称 | Publisher's Version/PDF (OpenAccess) | |||||
情報源 | ||||||
関連識別子 | https://www.springernature.com/jp | |||||
関連名称 | Springer Nature | |||||
出版者 | ||||||
出版者 | Springer Nature |