Improvement of Odin/SMR water vapour and temperature measurements and validation of the obtained data sets

• Main Authors: F. Grieco, K. Pérot, D. Murtagh, P. Eriksson, B. Rydberg, M. Kiefer, M. Garcia-Comas, A. Lambert, K. A. Walker
• Format: Article
• Language: English
• Published: Copernicus Publications 2021-08-01
• Series: Atmospheric Measurement Techniques
• Online Access: https://amt.copernicus.org/articles/14/5823/2021/amt-14-5823-2021.pdf

<p>Its long photochemical lifetime makes H<span class="inline-formula">₂</span>O a good tracer for mesospheric dynamics. Temperature observations are also critical to study middle atmospheric dynamics. In this study, we present the reprocessing of 18 years of mesospheric H<span class="inline-formula">₂</span>O and temperature measurements from the Sub-Millimetre Radiometer (SMR) aboard the Odin satellite, resulting in a part of the SMR version 3.0 level 2 data set. The previous version of the data set showed poor accordance with measurements from other instruments, which suggested that the retrieved concentrations and temperature were subject to instrumental artefacts. Different hypotheses have been explored, and the idea of an underestimation of the single-sideband leakage turned out to be the most reasonable one. The value of the lowest transmission achievable has therefore been raised to account for greater sideband leakage, and new retrievals have been performed with the new settings. The retrieved profiles extend between 40–100 km altitude and cover the whole globe to reach 85<span class="inline-formula">^∘</span> latitudes. A validation study has been carried out, revealing an overall better accordance with the compared instruments. In particular, relative differences in H<span class="inline-formula">₂</span>O mixing ratio are always in the <span class="inline-formula">±</span>20 % range between 40 and 70 km and diverge at higher altitudes, while temperature absolute differences are within <span class="inline-formula">±</span>5 K between 40–80 km and also diverge at higher altitudes.</p>