DEM-weighted Interpolation of Reanalysis-derived PWV for Millimeter-wave Astronomy at NSRT
文献类型：期刊论文
| 作者 | Li, Ming-Shuai1,3,4; Wang, Na1,3,4; Cui, Lang1,3,4; Zheng, Xing-Wu2; Li, Jian4,5; Zhang, Hua4; Li, Peng4; Duan, Xue-Feng4,5; Li, Xiao-Fei4 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2026-01-30 |
| 卷号 | 26期号:1页码:015016 |
| 关键词 | atmospheric effects methods: data analysis methods: statistical site testing |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/ae1ec8 |
| 产权排序 | 1 |
| 英文摘要 | Accurate estimation of precipitable water vapor (PWV) is critical for evaluating the feasibility of millimeter- and submillimeter-wave astronomical observations. We assess ERA5 and MERRA-2 reanalysis datasets at the Nanshan 26 m Radio Telescope (NSRT) and propose a Digital Elevation Model (DEM)-weighted Inverse Distance Weighting (IDW) interpolation method that accounts for both horizontal distance and elevation difference. Compared with nearest-neighbor and bilinear interpolation, the DEM-weighted approach substantially improves PWV estimation, with MERRA-2 achieving over 26% lower RMSE than its bilinear interpolation. Seasonal evaluation identifies MERRA-2 with DEM-weighted interpolation (M2-DEM) as the most accurate, with slightly higher summer bias than ERA5 DEM-weighted IDW (E5-DEM). A 30 yr PWV climatology (1995-2024) shows a pronounced annual cycle, stable interannual variability, and no significant long-term trend. Winter minima (typically below 3 mm) define the primary high-frequency observing window, while summer maxima arise from elevated temperatures and monsoonal moisture transport. Comparisons with QTT, GBT, and Effelsberg, along with atmospheric transmission modeling, confirm NSRT's favorable K- and Q-band transparency and partial 3 mm accessibility under optimal conditions. These results establish M2-DEM as the preferred dataset-method combination for site-specific PWV evaluation and provide a strong basis for expanding NSRT's high-frequency astronomical capabilities. |
| WOS关键词 | PRECIPITABLE WATER-VAPOR ; GPS MEASUREMENTS ; TIBETAN PLATEAU ; PERFORMANCE ; METEOROLOGY ; SURFACE |
| 资助项目 | Xinjiang Key Laboratory of Radio Astrophysics[2023D04064] ; CAS Light of West China Program[2021-XBQNXZ-030] ; CAS Light of West China Program[2021-XBQNXZ-005] ; National Key R&D Program of China[2024YFA1611503] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001632247000001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Xinjiang Key Laboratory of Radio Astrophysics ; CAS Light of West China Program ; National Key R&D Program of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8350]  |
| 专题 | 射电天文研究室_利用南山26米射电望远镜观测数据的文章 |
| 通讯作者 | Li, Ming-Shuai |
| 作者单位 | 1.Xinjiang Key Lab Radio Astrophys, Urumqi 830011, Peoples R China 2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron & Technol, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 5.Xinjiang Key Lab Microwave Technol, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ming-Shuai,Wang, Na,Cui, Lang,et al. DEM-weighted Interpolation of Reanalysis-derived PWV for Millimeter-wave Astronomy at NSRT[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2026,26(1):015016. |
| APA | Li, Ming-Shuai.,Wang, Na.,Cui, Lang.,Zheng, Xing-Wu.,Li, Jian.,...&Li, Xiao-Fei.(2026).DEM-weighted Interpolation of Reanalysis-derived PWV for Millimeter-wave Astronomy at NSRT.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,26(1),015016. |
| MLA | Li, Ming-Shuai,et al."DEM-weighted Interpolation of Reanalysis-derived PWV for Millimeter-wave Astronomy at NSRT".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 26.1(2026):015016. |
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