Validation Studies
v2.2 Validation Papers
Date: May 2007
Details on MLS v2.2 validation are given in forthcoming validation papers that have been submitted to the Journal of Geophysical Research.
They are awaiting review and publishing. Below are preprint versions of validation papers for each MLS v2.2 Level 2 product.
Full citations can be found on the MLS publications page.
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Early Validation Analyses of Atmospheric Profiles From EOS MLS on the Aura Satellite
Date: May 2006
We present results of early validation studies using
retrieved atmospheric profiles from the Earth Observing System
Microwave Limb Sounder (MLS) instrument on the Aura satellite.
"Global" results are presented for MLS measurements of
atmospheric temperature, ozone, water vapor, hydrogen chloride,
nitrous oxide, nitric acid, and carbon monoxide, with a focus on
the January - March 2005 time period. These global comparisons
are made using long-standing global satellites and meteorological
datasets, as well as some measurements from more recently
launched satellites. Comparisons of MLS data with measurements
from the Ft. Sumner, NM, September 2004 balloon flights are
also presented. Overall, good agreeement is obtained, often within
5% to 10%, but we point out certain issues to resolve and some
larger systematic differences; some artifacts in the first publicly
released MLS (version 1.5) dataset are noted.We comment briefly
on future plans for validation and software improvements. +Read more
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Validation of Aura MLS HOx measurements with remote-sensing balloon instruments
Date: 07 July 2005
Satellite measurements of OH and HO2 obtained by the Aura MLS instrument are compared to the balloon-borne BOH and FIRS-2 instruments. All measurements are also compared with constrained photochemical model calculations. On average, both balloon measurements for OH agree with MLS within 17% over 25-40 km and the measurements agree with the model within 12%. The three measurements for column of OH above 40 km agree within 8% and the mean is 12% below the model. Measurements of HO2 from FIRS-2 and MLS agree on average within 23% over 25-40 km and the differences are generally within the experimental precision. The HO2 measurements agree with the model within 14%. Measurements of HO2 for the column over 40-60 km agree within 16% and the mean measured column agrees with the model within the experimental precision. Our observations do not appear to indicate a "HOx dilemma." +Read more
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Carbon monoxide measured by the EOS Microwave Limb Sounder on Aura: First results
Date: 28 July 2005
Atmospheric carbon monoxide (CO) is measured by
the EOS Microwave Limb Sounder (MLS) on NASA's
recently-launched Aura satellite. Descent has been observed
in the 2004-2005 Northern Hemisphere winter polar
mesosphere and upper stratosphere. During August and
September 2004 enhanced CO was observed in the upper
troposphere over India and Tibet. The MLS CO
measurements are described and the radiance signal due to
the enhanced CO in the upper troposphere is demonstrated.
+Read more
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