AOS Weather Conditions at 5:26pm
Temp: 65F - Wind: 4mph WSW - Humidity: 24%

AOS, Inc. advances science by building atmospheric instrumentation
and providing observations of the Earth's climate.


Manned Aircraft


2012-2013 Double-Blind Validation

2012-2013 Phased Broadband Validation

2012-2013 Phased Broadband Validation - High Frequency

Statistics of Phased Broadband Validation of DOE-ARM-ACME

Flight Reports

A listing of available flight reports is available here.  The data contained in the reports was generated by the AOS® CO2 Airborne Analyzer System.

All files in the North American archive ending in "_CurtisRanch.pdf" are observations above the Curtis Ranch Ameriflux Site (40.734N, 104.301W). The observations were funded through an SBIR contract with the US Department of Energy. A link to the summary file for the mission reports can be found here.

An electronic copy of our poster from ICDC7 (all profiles) can be downloaded here.

The airborne platform (Cessna 210T and others) takes off out of Boulder, CO and flies northeast to the Curtis Ranch Ameriflux site. The mission is to observe multiple vertical profiles of Carbon Dioxide above a fixed location. We observe at least two profiles per flight and many flights we observe four profiles. Our overall goals are to complete 100 flights and to observe 300 vertical profiles.

Vertical Profiles by AOS High Precision Analyzer Systems

Ameriflux Observation

click for larger image

Verification of a pair of independent AOS analyzer systems for a flight above Carr CO. Altitude ranged from 2000 AGL to 26000 ASL. Resolution was 1 Hz, rms noise was 0.1 ppm, and calibration was by WMO standards specific to each of the systems. The systems were the prototype AOS system that has been flown for approximately 100 flights and a product sold to Spain. Air was teed from a single gust tube and pushed through each system by its own compressor.

NOAA Comparison

click for larger image

The prototype system has been verified many times further by grab samples acquired and analyzed by NOAA/GMD. Shown are four (4) typical verifications. Accuracy and reproducibility are approximately 0.1 ppm as determined by both the continuous versus continuous comparison (above) or by the grab sampling with Programmable Flask Package.

Piloted Ships

MBARI and AOS Obs.

click for larger image

Time series of a typical cruise from MBARI on the R/V Point Lobos. Agreement between the AOS and MBARI systems is within the target accuracy of 1 ppm. The Point Lobos cruises are key to understanding the constraints on mapping the dynamic coastal regions of the oceans. These cruises have also served as a regular check of the p(CO2) monitor’s performance as it is exposed to the oceanic elements more and more.


Please check back for updated mission reports!


Please check back for updated mission reports!

Atmospheric Observing Systems, Inc.
1930 Central Ave. • Suite A • Boulder, CO 80301
Phone: 303-443-3389 • Fax:303-440-3328
Contact AOS