slide1
Download
Skip this Video
Download Presentation
An Autonomous Inexpensive Robust CO 2 Analyzer (AIRCOA)

Loading in 2 Seconds...

play fullscreen
1 / 33

An Autonomous Inexpensive Robust CO 2 Analyzer (AIRCOA) - PowerPoint PPT Presentation


  • 76 Views
  • Uploaded on

An Autonomous Inexpensive Robust CO 2 Analyzer (AIRCOA). Britton Stephens, Andrew Watt, and Gordon Maclean National Center for Atmospheric Research, Boulder, Colorado, USA. Using high frequency data makes signals bigger, but the annual-mean signals are still very small:.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' An Autonomous Inexpensive Robust CO 2 Analyzer (AIRCOA)' - raina


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

An Autonomous Inexpensive Robust CO2 Analyzer (AIRCOA)

Britton Stephens, Andrew Watt, and Gordon Maclean

National Center for Atmospheric Research, Boulder, Colorado, USA

slide2

Using high frequency data makes signals bigger, but the annual-mean signals are still very small:

To measure 0.2 GtCyr-1 source/sink to +/- 25% need to measure regional annual mean gradients to 0.1-0.2 ppm

Flux footprint, in ppm(GtCyr-1)-1, for a 106 km2 chaparral region in the U.S. Southwest (Gloor et al., 1999).

slide16

Drying system monitoring

A change of 0.5% RH is approximately 300 ppm H2O, which would cause a dilution error of 0.1 ppm in CO2

slide18

Nafion absorption effect

Flow pulled through Nafion went from 300 to 50 sccm at t = 30 sec

slide22

Automated (4- or 8-hourly) leak checks

A positive trend of 0.3 kPa/min would be a leak rate of 0.1 sccm which if 100 ppm different would cause a 0.1 ppm bias

slide26

Regulator oven tests

Three cylinders were in the oven and one (green dots) was not

slide30

Laboratory intercomparisons

Laboratory offsets less than 0.05 ppm (1-sigma = 0.13 ppm)

Field surveillance tanks

2.5-month average field differences from assigned values 0.01 to 0.10 ppm (1-sigma = 0.10 to 0.13 ppm)

slide32

Automated web-based output

http://www.eol.ucar.edu/~stephens/RACCOON

ad