English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  High accuracy measurements of dry mole fractions of carbon dioxide and methane in humid air

Rella, C., Chen, H., Andrews, A., Filges, A., Gerbig, C., Hatakka, J., et al. (2013). High accuracy measurements of dry mole fractions of carbon dioxide and methane in humid air. Atmospheric Measurement Techniques, 6, 837-860. doi:10.5194/amt-6-837-2013.

Item is

Files

show Files
hide Files
:
BGC1695D.pdf (Preprint), 3MB
Name:
BGC1695D.pdf
Description:
Discussion paper
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
:
BGC1695S1.pdf (Supplementary material), 154KB
Name:
BGC1695S1.pdf
Description:
-
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
:
BGC1695.pdf (Publisher version), 4MB
Name:
BGC1695.pdf
Description:
-
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-

Locators

show
hide
Locator:
http://dx.doi.org/10.5194/amt-6-837-2013 (Publisher version)
Description:
OA
OA-Status:

Creators

show
hide
 Creators:
Rella, C.W., Author
Chen, H., Author
Andrews, A.E., Author
Filges, Annette1, Author           
Gerbig, Christoph1, Author           
Hatakka, J., Author
Karion, A., Author
Miles, N.L., Author
Richardson, S.J., Author
Steinbacher, M., Author
Sweeney, C., Author
Wastine, B., Author
Zellweger, C., Author
Affiliations:
1Airborne Trace Gas Measurements and Mesoscale Modelling, Dr. habil. C. Gerbig, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497784              

Content

show
hide
Free keywords: -
 Abstract: Traditional techniques for measuring the mole fractions of greenhouse gases in the well-mixed atmosphere have required dry sample gas streams (dew point <−25 C) to achieve the inter-laboratory compatibility goals set forth by the Global Atmosphere Watch programme of the World Meteorological Organisation (WMO/GAW) for carbon dioxide (±0.1 ppm in the Northern Hemisphere and ±0.05 ppm in the Southern Hemisphere) and methane (±2 ppb). Drying the sample gas to low levels of water vapour can be expensive, time-consuming, and/or problematic, especially at remote sites where access is difficult. Recent advances in optical measurement techniques, in particular cavity ring down spectroscopy, have led to the development of greenhouse gas analysers capable of simultaneous measurements of carbon dioxide, methane and water vapour. Unlike many older technologies, which can suffer from significant uncorrected interference from water vapour, these instruments permit accurate and precise greenhouse gas measurements that can meet the WMO/GAW inter-laboratory compatibility goals (WMO, 2011a) without drying the sample gas. In this paper, we present laboratory methodology for empirically deriving the water vapour correction factors, and we summarise a series of in-situ validation experiments comparing the measurements in humid gas streams to well-characterised dry-gas measurements. By using the manufacturer-supplied correction factors, the dry-mole fraction measurements have been demonstrated to be well within the GAWcompatibility goals up to a water vapour concentration of at least 1 %. By determining the correction factors for individual instruments once at the start of life, this water vapour concentration range can be extended to at least 2% over the life of the instrument, and if the correction factors are determined periodically over time, the evidence suggests that this range can be extended up to and even above 4% water vapour concentrations.

Details

show
hide
Language(s):
 Dates: 2013-02-272013-03-272013
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: BGC1695
DOI: 10.5194/amt-6-837-2013
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Atmospheric Measurement Techniques
  Abbreviation : AMT
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Göttingen : European Geosciences Union, Copernicus
Pages: - Volume / Issue: 6 Sequence Number: - Start / End Page: 837 - 860 Identifier: ISSN: 1867-1381
CoNE: https://pure.mpg.de/cone/journals/resource/1867-1381