Observation of HD¹⁸O, CH₃OH and vibrationally-excited N₂O from Odin/SMR measurements

Abstract

The sub-millimetre radiometer (SMR) instrument aboard the Odin satellite launched in February 2001 is dedicated to the observation of trace gas profiles in the stratosphere and in the mesosphere, in particular water vapour and its isotopic species HDO, H 2 17 O and H 2 18 O. By averaging more than 400 000 Odin/SMR spectra over the period from November 2002 to March 2003, weak lines have been detected in the atmosphere. These weak lines have been attributed to water isotopic species HD 18 O, to a vibrationally-excited N 2 O, and to CH 3 OH.

Sub-millimeter observations of the terrestrial atmosphere during an Earth flyby of the MIRO sounder on the Rosetta spacecraft

“…2 O at 547.67 GHz (Zelinger et al, 2006). In comparison, the lines observed by MIRO are weaker and, being very close to the strong 557 H 2 O transition, their expected contribution to the total spectral radiances is very small, as shown in Fig.…”

Stable Water Isotopologues in the Stratosphere Retrieved from Odin/SMR Measurements

“…The measurements of normal and deuterated water from the ACE-FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) were used to map global climatological behavior of HDO along with the HDO/H 2 O ratio in the upper troposphere-lower stratosphere, but for this dataset measurements were made in the tropics only during February, April, August and October [19]. Recently, a particularly rich source of SWIs, with vertical coverage reaching the mesosphere, has been retrieved from the measurements by SMR (Sub-Millimetre Radiometer) aboard the Odin satellite since 2001 [20]. Odin/SMR SWIs data have much longer time span than, e.g., MIPAS, and higher than, e.g., ACE-FTS, which retrieves HDO from 6.5 to 37.5 km in altitude [21].…”

Dispersion of Light and Heavy Pollutants in Urban Scale Models: CO2 Laser Photoacoustic Studies

“…1 Selective, sensitive, and nondestructive laser-based analytical methods have been steadily more employed to monitor trace amounts of gases present in the atmosphere. [2][3][4][5] Elevated concentration levels of both primary and secondary atmospheric pollutants mainly occur in the lower parts of the troposphere, the region where relevant physical-chemical processes are also directly influenced by the presence of earth's surface. This part of the troposphere is known as the atmospheric boundary layer.…”