Metrological challenges for measurements of key climatological observables. Part 4: atmospheric relative humidity
| Autor: | Olaf Hellmuth, Rainer Feistel, J W Lovell-Smith, J. R. Cooper, Allan H. Harvey, Martti Heinonen, S A Bell |
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| Rok vydání: | 2015 |
| Předmět: |
Earth's energy budget
010504 meteorology & atmospheric sciences Meteorology definitions Greenhouse relative humidity 01 natural sciences Article 010309 optics Units of measurement Latent heat 0103 physical sciences Thermal SDG 13 - Climate Action Relative humidity meteorology climate 0105 earth and related environmental sciences General Engineering Humidity Metrology metrology Environmental science IAPWS BIPM |
| Zdroj: | Lovell-Smith, J W, Feistel, R, Harvey, A H, Hellmuth, O, Bell, S A, Heinonen, M & Cooper, J R 2016, ' Metrological challenges for measurements of key climatological observables. Part 4: Atmospheric relative humidity ', Metrologia, vol. 53, no. 1, pp. R40-R59 . https://doi.org/10.1088/0026-1394/53/1/R40 |
| ISSN: | 1681-7575 0026-1394 |
| DOI: | 10.1088/0026-1394/53/1/r40 |
| Popis: | Water in its three ambient phases plays the central thermodynamic role in the terrestrial climate system. Clouds control Earth's radiation balance, atmospheric water vapour is the strongest 'greenhouse' gas, and non-equilibrium relative humidity at the air-sea interface drives evaporation and latent heat export from the ocean. In this paper, we examine the climatologically relevant atmospheric relative humidity, noting fundamental deficiencies in the definition of this key observable. The metrological history of this quantity is reviewed, problems with its current definition and measurement practice are analysed, and options for future improvements are discussed in conjunction with the recent seawater standard TEOS-10. It is concluded that the International Bureau of Weights and Measures (BIPM), in cooperation with the International Association for the Properties of Water and Steam (IAPWS), along with other international organizations and institutions, can make significant contributions by developing and recommending state-of-the-art solutions, such as are suggested here, for what are long-standing metrological problems. |
| Databáze: | OpenAIRE |
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