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• W4383370921 abstract "In this study we introduce four Distributed Temperature Sensing (DTS) set-ups deployed at an irrigated alfalfa field site (La Cendrosa) as part of the LIAISE field campaign during 15-30 July 2021 in the north-east of Spain. &#160;The DTS technique relies on the temperature dependence of Raman backscattering of light in a fibre optic cable. DTS provides spatially distributed temperature data over time. The type of profile (horizontal vs vertical), spatial- and temporal resolution and distance covered depend on the measurement configuration. To observe land-atmosphere interactions, we installed four set-ups in the LIAISE campaign, each of which focus on a different aspect. We deployed a 1.6 mm diameter fibre covering a total distance of 600 m, which measured temperature at 5 s and 25.4 cm resolutions. In this continuous cable we included three DTS set-ups: 1) a surface layer profile between 1.6 - 40 m with a 25.4 cm vertical resolution, 2) a canopy profile averaged horizontally over 2.5 m with cables at 8 vertical levels between 0 - 1 m height inside of the rapidly-growing alfalfa and 3) a soil profile between -0.5 - 0 m with a vertical resolution of 1.25 cm; the enhanced spatial resolution was obtained by winding the cable onto a coil that was installed in the soil. An overview of these measurements is given, with an emphasis on factors limiting accuracy and on potential use in further research. A fourth set-up was a so-called &#8220;turbulence harp&#8221;, which used a thinner and faster optical cable (0.5 mm) over a horizontal path of 70 m, measuring at four heights between 0.40 m and 2.05 m. Measurements were made at 1 Hz and 12.7 cm resolutions and a turbulent temperature spectrum was resolved up to 0.15 Hz. From this set-up, turbulence intensity was expressed in terms of the structure parameter of temperature (CT2). We estimated CT2 both from the temperature time series along the DTS cables, as well as, and this is a novel approach, from the spatial temperature series over the DTS cable. The spatially determined structure parameter correlated with a sonic anemometer CT2 estimate, with a correlation coefficient of 0.88. This work outlines the potential for using DTS in land-atmosphere interaction campaigns and provides a first step towards using DTS in capturing turbulent information along a spatial temperature series.&#160;" @default.
• W4383370921 created "2023-07-07" @default.
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• W4383370921 date "2023-07-06" @default.
• W4383370921 modified "2023-10-17" @default.
• W4383370921 title "Spatial temperature measurements at the land-air interface using Distributed Temperature Sensing" @default.
• W4383370921 doi "https://doi.org/10.5194/ems2023-603" @default.
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