Odin/SMR limb observations of stratospheric trace gases: Validation of N2O
Journal article, 2005

The Sub-Millimetre Radiometer (Odin/SMR) on board the Odin satellite, launched on 20 February 2001, performs regular measurements of the global distribution of stratospheric nitrous oxide (N2O) using spectral observations of the J = 20→ 19 rotational transition centered at 502.296 GHz. We present a quality assessment for the retrieved N2O profiles (level 2 product) by comparison with independent balloonborne and aircraftborne validation measurements as well as by cross-comparing with preliminary results from other satellite instruments. An agreement with the airborne validation experiments within 28 ppbv in terms of the root mean square (RMS) deviation is found for all SMR data versions (v222, v223, and v1.2) under investigation. More precisely, the agreement is within 19 ppbv for N2O volume mixing ratios (VMR) lower than 200 ppbv and within 10% for mixing ratios larger than 150 ppbv. Given the uncertainties due to atmospheric variability inherent to such comparisons, these values should be interpreted as upper limits for the systematic error of the Odin/SMR N2O measurements. Odin/SMR N2O mixing ratios are systematically slightly higher than nonvalidated data obtained from the Improved Limb Atmospheric Spectrometer-II (ILAS-II) on board the Advanced Earth Observing Satellite-II (ADEOS-II). Root mean square deviations are generally within 23 ppbv (or 20% for VMR-N2O > 100 ppbv) for versions 222 and 223. The comparison with data obtained from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on the Envisat satellite yields a good agreement within 9-17 ppbv (or 10% for VMR-N2O > 100 ppbv) for the same data versions. Odin/SMR version 1.2 data show somewhat larger RMS deviations and a higher positive bias.

Author

Joachim Urban

Chalmers, Department of Radio and Space Science, Global Environmental Measurements

N. Lautié

E. Le Flochmoën

J. Jiménez

Patrick Eriksson

Chalmers, Department of Radio and Space Science, Global Environmental Measurements

J. De La Noë

E. Dupuy

L. El Amraoui

U. Frisk

F. Jégou

Donal Murtagh

Chalmers, Department of Radio and Space Science, Global Environmental Measurements

Michael Olberg

Chalmers, Department of Radio and Space Science, National Facility for Radio Astronomy

P. Ricaud

C. Camy-Peyret

G. Dufour

S. Payan

N. Huret

M. Pirre

A.D. Robinson

N.R.P. Harris

al et

Journal of Geophysical Research

01480227 (ISSN) 21562202 (eISSN)

Vol. 110 9 D09301-

Subject Categories

Meteorology and Atmospheric Sciences

DOI

10.1029/2004JD005394

More information

Created

10/8/2017