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Retrieval and validation of carbon dioxide, methane and water vapor for the Canary Islands IR-laser occultation experiment.
- Source :
- Atmospheric Measurement Techniques; 2015, Vol. 8 Issue 8, p3315-3336, 22p
- Publication Year :
- 2015
-
Abstract
- The first ground-based experiment to prove the concept of a novel space-based observation technique for microwave and infrared-laser occultation between low-Earthorbit satellites was performed in the Canary Islands between La Palma and Tenerife. For two nights from 21 to 22 July 2011 the experiment delivered the infrared-laser differential transmission principle for the measurement of greenhouse gases (GHGs) in the free atmosphere. Such global and long-term stable measurements of GHGs, accompanied also by measurements of thermodynamic parameters and line-of-sight wind in a self-calibrating way, have become very important for climate change monitoring. The experiment delivered promising initial data for demonstrating the new observation concept by retrieving volume mixing ratios of GHGs along a ∼ 144 km signal path at altitudes of ∼ 2:4 km. Here, we present a detailed analysis of the measurements, following a recent publication that introduced the experiment's technical setup and first results for an example retrieval of CO<subscript>2</subscript>. We present the observational and validation data sets, the latter simultaneously measured at the transmitter and receiver sites; the measurement data handling; and the differential transmission retrieval procedure. We also determine the individual and combined uncertainties influencing the results and present the retrieval results for <superscript>12</superscript>CO<subscript>2</subscript>, <superscript>13</superscript>CO<subscript>2</subscript>, C<superscript>18</superscript>OO, H<subscript>2</subscript>O and CH<subscript>4</subscript>. The new method is found to have a reliable basis for monitoring of greenhouse gases such as CO<subscript>2</subscript>, CH<subscript>4</subscript>, and H<subscript>2</subscript>O in the free atmosphere. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18671381
- Volume :
- 8
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Atmospheric Measurement Techniques
- Publication Type :
- Academic Journal
- Accession number :
- 109066588
- Full Text :
- https://doi.org/10.5194/amt-8-3315-2015