NOAA logo National Oceanic and Atmospheric Administration (NOAA), Earth System Research Laboratory (ESRL)

NDSC logo Network For the Detection of Atmospheric Composition Change (NDACC)

NIWA logo National Institute of Water and Atmospheric Research (NIWA)

What does this program measure?

The program measures Nitrogen Dioxide (NO2), including NO2 90° slant column density data, from Mauna Loa Observatory.

How does this program work?

The NO2 monitor uses a single grating monochromator to measure the zenith skylight between 450 nm and 490 nm, with a resolution of about 1 nm. Scans are made under computer control during early and late morning, and a difference method is used to retrieve NO2 concentration using known absorption lines of the gas. By using scans from various times during the morning it is possible to obtain a profile of NO2.

Why is this research important?

It is important to continuously monitor stratospheric NO2 at MLO.

Are there any trends in the data?

How does this program fit into the big picture?

What is it's role in global climate change?

Comments and References

Lead Investigator(s):

Paul V. Johnston (NIWA)

MLO Contact(s):

Paul Fukumura
808-933-6965 (x223)
Dr. John E. Barnes
808-933-6965 (x222)

Web Site(s)

Date Started

July 9, 1996

Related Programs


BrO and NO2 sensor chimneys
Bromine Oxide (near) and Nitrogen Dioxide (far) sensor chimneys on MLO sun deck