Publication Date:
2017-10-17
Description:
Large parts of the anthropogenic greenhouse gas emissions of CO2 and CH4 are released from localised and point
sources such as power plants or as fugitive emissions from fossil fuel mining and production sites. These emissions,
however, are often not readily assessed by current measurement systems and networks. A tool developed to better
understand point sources of CO2 and CH4 is the optical remote sensing instrument MAMAP (Methane Airborne
MAPer), operated from aircraft. After a recent instrument modification, retrievals of the column averaged dry
air mole fractions for methane XCH4 (or for carbon dioxide XCO2) derived from MAMAP observations in the
short-wave infrared, have a precision of about 0.4% significantly improving data quality.
MAMAP total column data also serve as a testbed for inversion concepts for greenhouse gas emissions from
point sources using total column atmospheric concentration measurements. As information on wind speed is an
important input parameter for the inference of emission rates using MAMAP data, recent measurement campaigns
comprised an in-situ wind probe operated onboard the same aircraft. Incorporation of these wind measurements in
combination with model data leads to a large reduction of uncertainties on the inversion result. Using the examples
of two coal mine ventilation shafts in Western Germany as well as other anthropogenic targets, the value of high
resolution total column data to obtain emission rate estimates is demonstrated. MAMAP has also been tested in
sunglint geometry over the ocean and has therefore the potential for application also to offshore emission sites.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Conference
,
notRev
Format:
application/pdf
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