Improvement of Odin/SMR water vapour and temperature measurements and validation of the obtained data sets
Artikel i vetenskaplig tidskrift, 2021

Its long photochemical lifetime makes H2O 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 H2O 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 singlesideband 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° latitudes. A validation study has been carried out, revealing an overall better accordance with the compared instruments. In particular, relative differences in H2O mixing ratio are always in the ±20% range between 40 and 70 km and diverge at higher altitudes, while temperature absolute differences are within ±5K between 40-80 km and also diverge at higher altitudes.

Författare

Francesco Grieco

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Kristell Perot

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Donal Murtagh

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Patrick Eriksson

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Bengt Rydberg

Molflow AB

M. Kiefer

Karlsruher Institut für Technologie (KIT)

M. Garcia-Comas

Instituto de Astrofisica de Andalucía (IAA)

A. Lambert

Jet Propulsion Laboratory, California Institute of Technology

K.A. Walker

University of Toronto

Atmospheric Measurement Techniques

1867-1381 (ISSN) 1867-8548 (eISSN)

Vol. 14 8 5823-5857

Svenska åtaganden gentemot satelliten Odin

Rymdstyrelsen (72/17), 2018-01-01 -- 2018-12-31.

Ämneskategorier

Meteorologi och atmosfärforskning

Naturgeografi

Klimatforskning

DOI

10.5194/amt-14-5823-2021

Mer information

Senast uppdaterat

2021-09-16