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Performance Simulations of Spaceborne Methane Observations by Integrated-Path Differential Absorption Lidar

Kiemle, Christoph and Ehret, Gerhard (2010) Performance Simulations of Spaceborne Methane Observations by Integrated-Path Differential Absorption Lidar. 38th scientific assembly of the committee on space research, 18.-25. Juli 2010, Bremen.

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Abstract

A lidar-based satellite instrument for global observations of atmospheric methane is foreseen whose expected performance and technical feasibility are currently investigated in planning phase 0/A. Methane is, after carbon dioxide, the second most important greenhouse gas, whereby its anthropogenic emissions are much more uncertain. In addition, climate change may cause an important positive feedback of yet unknown intensity by release of methane from melting permafrost soils and ocean sediments. The current observational network is not able to monitor these sources with sufficient density and accuracy: While the ground-based in-situ network is too sparse, existing passive remote sensors on spacecraft are not accurate enough. Preliminary studies show that lidar with a realistic instrument design on a LEO platform has the potential to overcome these shortcomings and to measure methane with an accuracy and spatial resolution that satisfies the requirements of the user community. The presentation will include basic issues such as the selection of suitable methane absorption wavelengths, key performance parameters of instrument and spacecraft, and an assessment of the residual bias. It will highlight critical performance parameters such as instrument noise and surface reflectivity, and list the instrument and platform characteristics needed to fulfil the user requirements.

Document Type:Conference or Workshop Item (Speech, Poster)
Title:Performance Simulations of Spaceborne Methane Observations by Integrated-Path Differential Absorption Lidar
Authors:
AuthorsInstitution or Email of Authors
Kiemle, ChristophDLR IPA
Ehret, GerhardDLR IPA
Date:25 July 2010
Keywords:atmospheric methane, remote sensing, lidar
Event Title:38th scientific assembly of the committee on space research
Event Location:Bremen
Event Type:international Conference
Event Dates:18.-25. Juli 2010
Organizer:ZARM, DLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben LIDAR-Forschung und -Entwicklung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Christoph Kiemle
Deposited On:06 Dec 2010 17:01
Last Modified:06 Dec 2010 17:01

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