Air Pollution - Trace Radical Absorption through Cavity-Enhanced Spectroscopy (TRACES)

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Resource or Project Abstract

This project has developed an incoherent broadband
cavity-enhanced absorption spectroscopy (IBBCEAS)
system for the detection of the important nocturnal oxidant NO3. The IBBCEAS system has been deployed and demonstrated in both atmosphere simulation chambers and in the field. An extensive suite of spectral analysis software was developed and tested on the system. It has
been shown that very long optical cavities are feasible and robust: the 20 m cavity demonstrated at the SAPHIR (simulation of atmospheric photochemistry in a large reaction) simulation chamber is longer than typical cavity ring-down and cavity-enhanced absorption systems by over an order of magnitude. Such long cavities are particularly suited to broadband measurements and the detection of multiple atmospheric trace gases because they allow lower reflectivity mirrors to be used while retaining high absorption ensitivity. Lower reflectivity mirrors are suited to broadband measurements because broadband light sources have much lower spectral power densities than lasers; in addition, the high reflectivity
region is broader for lower reflectivity mirrors, allowing several species to be detected simultaneously.

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Contact Information for This Resource

Dr. Uwe Heitmann
ISAS - Institute for Analytical Sciences
Atmospheric Scientist
ISAS - Institute for Analytical Sciences, Albert-Einstein-Str. 9, 12489, Berlin, Germany
Telephone: +49 - (0)30 - 6392 3540
e-mail: uwe.heitmann@online.de

Dr. Ravi Varma
University College Cork Ireland
Postdoctoral Researcher
Laser Spectroscopy Group, Department of Physics, Kane Building, Univesrity College Cork, Cork, Ireland
Telephone: +353 (0)21 490 3294
e-mail: r.varma@ucc.ie

Dr. Andy Ruth
University College Cork Ireland
University Lecturer in Experimental Physics
Laser Spectroscopy Group, Department of Physics, Kane Building, Univesrity College Cork, Cork, Ireland
Telephone: +353 21 490 2057
e-mail: a.ruth@ucc.ie

Dr. Dean Venables
University College Cork Ireland
University Lecturer in Experimental Physics
Laser Spectroscopy Group, Department of Physics, Kane Building, Univesrity College Cork, Cork, Ireland
Telephone: +353 (0)21 490 2439
e-mail: d.venables@ucc.ie

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Data, Files, Information Objects Related To This Project Resource

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Attachment Name and Download Link
Offline Print Quality Version    STRIVE_15_Heitman_TRACES_prn.pdf  (9.27 Mb)
Project Report Optimised For Online Viewing    STRIVE_15_Heitman_TRACES_web.pdf  (2.73 Mb)

Suggested Citation Information

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Author(s)Heitmann, U. Varma, R. Ruth, A. Venables, D.
Title Of WebsiteSecure Archive For Environmental Research Data
Publication InformationAir Pollution - Trace Radical Absorption through Cavity-Enhanced Spectroscopy (TRACES)
Name of OrganisationEnvironmental Protection Agency Ireland
Electronic Address or URL http://erc.epa.ie/safer/resource?id=a4529598-20ea-102c-b381-901ddd016b14
Unique Identifiera4529598-20ea-102c-b381-901ddd016b14
Date of AccessLast Updated on SAFER: 2017-03-23

An example of this citation in proper usage:

Heitmann, U. Varma, R. Ruth, A. Venables, D.   "Air Pollution - Trace Radical Absorption through Cavity-Enhanced Spectroscopy (TRACES)". Associated datasets and digitial information objects connected to this resource are available at: Secure Archive For Environmental Research Data (SAFER) managed by Environmental Protection Agency Ireland http://erc.epa.ie/safer/resource?id=a4529598-20ea-102c-b381-901ddd016b14 (Last Accessed: 2017-03-23)

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Access Information For This Resource

SAFER-Data Display URL http://erc.epa.ie/safer/iso19115/display?isoID=96
Resource KeywordsSpectroscopy Jülich intercomparison NO3/N2O5 incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS)
EPA/ERTDI/STRIVE Project Code2005-ET-MS-28-M3
EPA/ERTDI/STRIVE Project ThemeAir Quality
Resource Availability: Any User Can Download Files From This Resource
Public-Open
Limitations on the use of this ResourceWhile no data is attached to this resource third party users are encouraged to properly cite any references to the attached report in any derived work. Please see the automatically generated citation below for a guide.
Number of Attached Files (Publicly and Openly Available for Download): 2
Project Start Date Sunday 1st January 2006 (01-01-2006)
Earliest Recorded Date within any attached datasets or digital objects Monday 1st January 2007 (01-01-2007)
Most Recent Recorded Date within any attached datasets or digital objects Thursday 31st May 2007 (31-05-2007)
Published on SAFERSunday 21st December 2008 (21-12-2008)
Date of Last EditSunday 21st December 2008 at 20:28:38 (21-12-2008)
Datasets or Files Updated On Sunday 21st December 2008 at 20:28:38 (21-12-2008)

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Geographical and Spatial Information Related To This Resource

Description of Geographical Characteristics of This Project or Dataset
The aim of this project was the development of an incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) system for the detection of the important noctural oxidant NO3. It has been deployed and demonstrated in both atmospher simulation chambers and out in the field. The test locations for the field tests were Roches Point in Ireland for NO3 Measurements and at Kuujjuarapik at Hudson Bay Canada for Bro Measurements. Due to external problems (weather and mechanical) neither deployment of the instrumentation yielded any results. The locations of the two test areas are shown in the geographical coverage below.

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Supplementary Information About This Resource

In this section some supplementary information about this resource is outlined. Lineage information helps us to understand why this project was carried out, what policy or research requirements did it fulfil, etc. Lineage is important in understanding the rationale behind the carrying out of a project or the collection of a specific dataset etc. Links to web sites, applications, papers, etc are outlined to provide you with additional information or supplementary reading about the project or dataset

Lineage information about this project or dataset
Free Radicals are the driving force behind the chemistry of the natural and polluted environment. The systems in this project have used an open-pathconfiguration which has particular advantages for highly reactive species such as radicals, since there are no surfaces in the system on which the gases can react and bias the measurements. The long cavities allow the atmosphere to be probed with a much higher spatial resolution than other broadband systems, most notably long-path differential optical absorption spectroscopy (DOAS), an established field technique. The core objective for this project was the development of a highly sensitive spectroscopic instrument for the detection of the NO3 radical
Supplementary Information
From June 9 to June 21 2007, the newly built instrument participated in an NO3/N2O5 intercomparison in the SAPHIR (simulation of atmospheric photochemistry in a large reaction) chamber at the Forschungszentrum
Jülich in Germany.
Links To Other Related Resources
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