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Characterization of a New CH4, and CO2, Flux Instrument for the University of Wyoming King Air Platform.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of a New CH4, and CO2, Flux Instrument for the University of Wyoming King Air Platform./
作者:	Astaneh, Mohammad.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	61 p.
附註:	Source: Masters Abstracts International, Volume: 83-03.
Contained By:	Masters Abstracts International83-03.
標題:	Atmospheric sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28715743
ISBN:	9798538124176

Characterization of a New CH4, and CO2, Flux Instrument for the University of Wyoming King Air Platform.
Astaneh, Mohammad.

Characterization of a New CH4, and CO2, Flux Instrument for the University of Wyoming King Air Platform. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 61 p.

Source: Masters Abstracts International, Volume: 83-03.

Thesis (M.S.)--University of Wyoming, 2021.

This item must not be sold to any third party vendors.

Green house gases' fluxes in diverse areas such as forests, grasslands, wetlands and arctic regions have become more important as the surface-atmosphere exchange rates of GHG's are expected to respond to a changing climate. These fluxes can be determined using the eddy covariance method. Eddy covariance data from flux towers represents a comparatively local homogeneous source area by each tower. Meanwhile, there is a scarcity of eddy covariance sites in vast regions of interest, which can be accessible to aircraft flux measurement platforms. Moreover, the instantaneous picture of turbulent field which is provided by aircraft measurements is not prone to temporal trends and non-stationary effects. The aim of this research is to develop an aircraft eddy covariance system for the University of Wyoming King Air Research Aircraft equipped with a 10 Hz Picarro CO2/CH4 analyzer. Test flights to collect eddy covariance measurements of CH4 and CO2 were performed above the Pawnee National Grassland, located in northeastern Colorado. These test flights were designed to test the limits of the instrument and compare the performance to available comparable technology, such as the on-board LICOR 7500 CO2 analyzer. These fights probed the effects of transect length on the calculated flux and uncertainty. In addition to applying the eddy covariance technique, different spectral analysis methods are explored for the data obtained from the test fights. We applied a wavelet spectral analysis to the high-frequency signals to improve spatial discretization of the recorded fluxes. The metrics on the performance of this new flux system are reported and how it may be used to determine flux values in a heterogeneous environment is discussed.

ISBN: 9798538124176Subjects--Topical Terms:

3168354
Atmospheric sciences.
Subjects--Index Terms:

Carbon dioxide

Characterization of a New CH4, and CO2, Flux Instrument for the University of Wyoming King Air Platform.
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520 $a Green house gases' fluxes in diverse areas such as forests, grasslands, wetlands and arctic regions have become more important as the surface-atmosphere exchange rates of GHG's are expected to respond to a changing climate. These fluxes can be determined using the eddy covariance method. Eddy covariance data from flux towers represents a comparatively local homogeneous source area by each tower. Meanwhile, there is a scarcity of eddy covariance sites in vast regions of interest, which can be accessible to aircraft flux measurement platforms. Moreover, the instantaneous picture of turbulent field which is provided by aircraft measurements is not prone to temporal trends and non-stationary effects. The aim of this research is to develop an aircraft eddy covariance system for the University of Wyoming King Air Research Aircraft equipped with a 10 Hz Picarro CO2/CH4 analyzer. Test flights to collect eddy covariance measurements of CH4 and CO2 were performed above the Pawnee National Grassland, located in northeastern Colorado. These test flights were designed to test the limits of the instrument and compare the performance to available comparable technology, such as the on-board LICOR 7500 CO2 analyzer. These fights probed the effects of transect length on the calculated flux and uncertainty. In addition to applying the eddy covariance technique, different spectral analysis methods are explored for the data obtained from the test fights. We applied a wavelet spectral analysis to the high-frequency signals to improve spatial discretization of the recorded fluxes. The metrics on the performance of this new flux system are reported and how it may be used to determine flux values in a heterogeneous environment is discussed.
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