A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network
We present progress in the development of a passive, miniaturized Laser Heterodyne Radiometer (mini-LHR) that will measure key greenhouse gases (C02, CH4, CO) in the atmospheric column as well as their respective altitude profiles, and O2 for a measure of atmospheric pressure. Laser heterodyne radio...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20120014233 2023-05-15T15:18:48+02:00 A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network Wilson, Emily L. Miller, J. Houston Holben, Brent McLinden, Matthew L. Ott, Lesley E. Melroy, Hilary R. Unclassified, Unlimited, Publicly available December 03, 2012 application/pdf http://hdl.handle.net/2060/20120014233 unknown Document ID: 20120014233 http://hdl.handle.net/2060/20120014233 Copyright, Distribution as joint owner in the copyright CASI Instrumentation and Photography GSFC.ABS.6886.2012 American Geophysical Union (AGU) Fall Meeting; 3-7 Dec. 2012; San Francisco, CA; United States 2012 ftnasantrs 2019-07-21T00:47:12Z We present progress in the development of a passive, miniaturized Laser Heterodyne Radiometer (mini-LHR) that will measure key greenhouse gases (C02, CH4, CO) in the atmospheric column as well as their respective altitude profiles, and O2 for a measure of atmospheric pressure. Laser heterodyne radiometry is a spectroscopic method that borrows from radio receiver technology. In this technique, a weak incoming signal containing information of interest is mixed with a stronger signal (local oscillator) at a nearby frequency. In this case, the weak signal is sunlight that has undergone absorption by a trace gas of interest and the local oscillator is a distributive feedback (DFB) laser that is tuned to a wavelength near the absorption feature of the trace gas. Mixing the sunlight with the laser light, in a fast photoreceiver, results in a beat signal in the RF. The amplitude of the beat signal tracks the concentration of the trace gas in the atmospheric column. The mini-LHR operates in tandem with AERONET, a global network of more than 450 aerosol sensing instruments. This partnership simplifies the instrument design and provides an established global network into which the mini-LHR can rapidly expand. This network offers coverage in key arctic regions (not covered by OCO-2) where accelerated warming due to the release of CO2 and CH4 from thawing tundra and permafrost is a concern as well as an uninterrupted data record that will both bridge gaps in data sets and offer validation for key flight missions such as OCO-2, OCO-3, and ASCENDS. Currently, the only ground global network that routinely measures multiple greenhouse gases in the atmospheric column is TCCON (Total Column Carbon Observing Network) with 18 operational sites worldwide and two in the US. Cost and size of TCCON installations will limit the potential for expansion, We offer a low-cost $30Klunit) solution to supplement these measurements with the added benefit of an established aerosol optical depth measurement. Aerosols induce a radiative effect that is an important modulator of regional carbon cycles. Changes in the diffuse radiative flux fraction (DRF) due to aerosol loading have the potential to alter the terrestrial carbon exchange. Other/Unknown Material Arctic permafrost Tundra NASA Technical Reports Server (NTRS) Arctic |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Instrumentation and Photography |
spellingShingle |
Instrumentation and Photography Wilson, Emily L. Miller, J. Houston Holben, Brent McLinden, Matthew L. Ott, Lesley E. Melroy, Hilary R. A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
topic_facet |
Instrumentation and Photography |
description |
We present progress in the development of a passive, miniaturized Laser Heterodyne Radiometer (mini-LHR) that will measure key greenhouse gases (C02, CH4, CO) in the atmospheric column as well as their respective altitude profiles, and O2 for a measure of atmospheric pressure. Laser heterodyne radiometry is a spectroscopic method that borrows from radio receiver technology. In this technique, a weak incoming signal containing information of interest is mixed with a stronger signal (local oscillator) at a nearby frequency. In this case, the weak signal is sunlight that has undergone absorption by a trace gas of interest and the local oscillator is a distributive feedback (DFB) laser that is tuned to a wavelength near the absorption feature of the trace gas. Mixing the sunlight with the laser light, in a fast photoreceiver, results in a beat signal in the RF. The amplitude of the beat signal tracks the concentration of the trace gas in the atmospheric column. The mini-LHR operates in tandem with AERONET, a global network of more than 450 aerosol sensing instruments. This partnership simplifies the instrument design and provides an established global network into which the mini-LHR can rapidly expand. This network offers coverage in key arctic regions (not covered by OCO-2) where accelerated warming due to the release of CO2 and CH4 from thawing tundra and permafrost is a concern as well as an uninterrupted data record that will both bridge gaps in data sets and offer validation for key flight missions such as OCO-2, OCO-3, and ASCENDS. Currently, the only ground global network that routinely measures multiple greenhouse gases in the atmospheric column is TCCON (Total Column Carbon Observing Network) with 18 operational sites worldwide and two in the US. Cost and size of TCCON installations will limit the potential for expansion, We offer a low-cost $30Klunit) solution to supplement these measurements with the added benefit of an established aerosol optical depth measurement. Aerosols induce a radiative effect that is an important modulator of regional carbon cycles. Changes in the diffuse radiative flux fraction (DRF) due to aerosol loading have the potential to alter the terrestrial carbon exchange. |
format |
Other/Unknown Material |
author |
Wilson, Emily L. Miller, J. Houston Holben, Brent McLinden, Matthew L. Ott, Lesley E. Melroy, Hilary R. |
author_facet |
Wilson, Emily L. Miller, J. Houston Holben, Brent McLinden, Matthew L. Ott, Lesley E. Melroy, Hilary R. |
author_sort |
Wilson, Emily L. |
title |
A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
title_short |
A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
title_full |
A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
title_fullStr |
A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
title_full_unstemmed |
A Miniaturized Laser Heterodyne Radiometer for a Global Ground-Based Column Carbon Monitoring Network |
title_sort |
miniaturized laser heterodyne radiometer for a global ground-based column carbon monitoring network |
publishDate |
2012 |
url |
http://hdl.handle.net/2060/20120014233 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_source |
CASI |
op_relation |
Document ID: 20120014233 http://hdl.handle.net/2060/20120014233 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766348979587514368 |