Column water vapor determination in night period with a lunar photometer prototype
| Autor: | B. Damiri, F. Almansa, P. M. Romero, África Barreto, Emilio Cuevas |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Vapor de agua
Atmospheric Science Daytime 010504 meteorology & atmospheric sciences Column water vapor 0211 other engineering and technologies 02 engineering and technology 01 natural sciences law.invention Photometry (optics) Band-pass filter law Cimel photometer lcsh:TA170-171 Remote sensing 021101 geological & geomatics engineering 0105 earth and related environmental sciences business.industry lcsh:TA715-787 lcsh:Earthwork. Foundations Photometer Geodesy AERONET lcsh:Environmental engineering 13. Climate action Global Positioning System Radiosonde Environmental science business Fotómetro Cimel Water vapor |
| Zdroj: | Atmospheric Measurement Techniques, Vol 6, Iss 8, Pp 2159-2167 (2013) ARCIMIS. Archivo Climatológico y Meteorológico Institucional (AEMET) Agencia Estatal de Meteorología (AEMET) |
| ISSN: | 1867-8548 1867-1381 |
| Popis: | In this paper we present the preliminary results of atmospheric column-integrated precipitable water vapor (PWV) obtained with a new Lunar Cimel photometer (LC) at the high mountain Izaña Observatory in the period July–August 2011. We have compared quasi-simultaneous nocturnal PWV from LC with PWV from a Global Positioning System (GPS) receiver and nighttime radiosondes (RS92). LC data have been calibrated using the Lunar Langley method (LLM). We complemented this comparative study using quasi-simultaneous daytime PWV from Cimel AERONET (CA), GPS and RS92. Comparison of daytime PWV from CA shows differences between GPS and RS92 up to 0.18 cm. Two different filters, with and approximate bandwidth of 10 nm and central wavelengths at 938 nm (Filter#1) and 937 nm (Filter#2), were mounted onto the LC. Filter#1 is currently used in operational AERONET sun photometers. PWV obtained with LC-Filter#1 showed an overestimation above 0.18 and 0.25 cm compared to GPS and RS92, respectively, and root-mean-square errors (RMSEs) up to 0.27 cm and 0.24 cm, respectively. Filter#2, with a reduced out-of-band radiation, showed very low differences compared with the same references (≤ 0.05 cm) and RMSE values ≤ 0.08 cm in the case of GPS precise orbits. These results demonstrate the ability of the new lunar photometer to obtain accurate and continuous PWV measurements at night, and the remarkable influence of the filter's transmissivity response to PWV determination at nighttime. The use of enhanced bandpass filters in lunar photometry, which is affected by more important inaccuracies than sun photometry, is necessary to infer PWV with similar precision to AERONET. |
| Databáze: | OpenAIRE |
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