On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English German |
| Veröffentlicht: |
Zürich
Geographisches Inst. ETH
1999
|
| Schriftenreihe: | Zürcher geographische Schriften
73 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zsfassung in dt. Sprache |
| Beschreibung: | X, 229 S. Ill., zahlr. graph. Darst., Kt. |
| ISBN: | 3906148211 |
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| 100 | 1 | |a Ammann, Christof |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |c Christof Ammann |
| 264 | 1 | |a Zürich |b Geographisches Inst. ETH |c 1999 | |
| 300 | |a X, 229 S. |b Ill., zahlr. graph. Darst., Kt. | ||
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Datensatz im Suchindex
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| adam_text | Titel: On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes
Autor: Ammann, Christof
Jahr: 1999
Table of Contents
Summary..........................................................................................................................................í
Zusammenfassung...........................................................................................................................vi
Table of Contents...........................................................................................................................vii
1 INTRODUCTION................................................................................................................1
2 THEORY...............................................................................................................................4
2.1 Trace Gas Exchange Between Biosphere and Atmosphere..........................................................4
2.1.1 Exchange Processes at the Surface...................................................................................5
2.1.2 Turbulent Transport in the Atmospheric Boundary Layer.................................................6
2.1.3 Quantitative Description and Resistance Models...............................................................8
2.1.4 Surface Energy Budget..................................................................................................11
2.2 Measurement Principles for Trace Gas Exchange.....................................................................12
2.2.1 Basic Considerations......................................................................................................12
2.2.2 Enclosure Techniques....................................................................................................13
2.2.3 Micrometeorological Concepts.......................................................................................15
2.3 Eddy Correlation Method.........................................................................................................18
2.3.1 Ergodicity and Taylor Hypothesis..................................................................................18
2.3.2 Turbulence Spectra........................................................................................................19
2.3.3 Statistical Description of Turbulence..............................................................................21
2.3.4 Application of the Eddy Correlation Method...................................................................23
2.4 Semi-empirical Relationships for Turbulent Fluxes...................................................................24
2.4.1 Dimensional Analysis and Similarity-Theory for the Surface Layer.................................25
2.4.2 Flux-Profile-Relationships..............................................................................................27
2.4.3 Displacement Height and Roughness Length...................................................................30
2.4.4 Variance Similarity........................................................................................................32
2.4.5 Limitations of Monin-Obukhov-similarity.......................................................................35
2.5 Eddy Accumulation Method.....................................................................................................36
2.5.1 Motivation and Theory...................................................................................................36
2.5.2 Realisation of the Proportional Eddy Accumulation Technique........................................38
2.5.3 Relaxed Eddy Accumulation Concept.............................................................................41
2.5.4 Application of the REA Technique.................................................................................44
2.6 Spatial Representativeness of Flux Measurements....................................................................45
2.6.1 Source Areas of Micrometeorological Methods...............................................................45
2.6.2 Comparison and Interpretation of Different Methods......................................................47
3 MEASUREMENTS...........................................................................................................50
3.1 General Description of Field Experiment..................................................................................50
3.1.1 Measurement Site and Period.........................................................................................50
3.1.2 Characterisation of the Triticale Canopy.........................................................................51
3.1.3 Overview of Measured Quantities and Instrumentation...................................................53
3.1.4 Tower Setup and Operation Periods...............................................................................55
3.2 Profile Systems........................................................................................................................56
3.2.1 Setup and Components...................................................................................................56
3.2.2 Trace Gas Analysers......................................................................................................59
3.2.3 Sensors for Meteorological Quantities............................................................................60
3.3 Eddy Correlation Systems........................................................................................................61
3.3.1 Setup and Components...................................................................................................61
3.3.2 Sonic Anemometer-Thermometer...................................................................................63
3.3.3 Closed Path Infra-Red-Gas-Analyser..............................................................................67
3.3.4 Fast Response Ozone Detector.......................................................................................71
3.4 Relaxed Eddy Accumulation System........................................................................................72
3.4.1 Setup and Components...................................................................................................72
3.4.2 Trace Gas Analysis........................................................................................................73
3.4.3 Conditional Sampling Valves.........................................................................................74
3.5 Determination of Non-turbulent Energy Fluxes.........................................................................76
3.5.1 Radiation Budget...........................................................................................................76
3.5.2 Energy Storage in the Canopy........................................................................................77
3.5.3 Soil Heat Flux...............................................................................................................78
4 EVALUATION OF COMMON METHODS...............................................................80
4.1 Eddy Correlation Calculations..................................................................................................80
4.1.1 Delay Time of Trace Gas Measurements........................................................................81
.2 Detrending and Covariance Calculation..........................................................................84
.3 Coordinate Rotation of the Wind Vector.........................................................................86
.4 Calibration and Correction for Correlated Density Effects..............................................90
.5 Correction for High Frequency Attenuation....................................................................94
.6 Spectral and Integral Similarity Relationships.................................................................97
4.2 Aerodynamic Flux-Profile Calculations..................................................................................103
4.2.1 Determination of zo and d.............................................................................................104
4.2.2 Numerical Calculation of Turbulence Parameters.........................................................106
4.2.3 Flux Calculation and Correction...................................................................................108
4.3 Data Rejection and Error Estimation......................................................................................109
4.3.1 Rejection Criteria and Final Datasets............................................................................109
4.3.2 Theoretical Uncertainty of Finite Turbulence Measurements.........................................Ill
4.3.3 Instrumental Noise and Measurement Resolution..........................................................113
4.3.4 Systematic Error Sources.............................................................................................114
4.4 Environmental Conditions and Flux Results...........................................................................115
4.4.1 General Weather Conditions.........................................................................................115
4.4.2 Source Area and Fetch Conditions................................................................................117
4.4.3 Senescence Development of the Triticale Field..............................................................120
4.4.4 Diurnal Variation of Fluxes and Concentrations...........................................................123
5 EVALUATION OF REA METHOD...........................................................................126
5.1 Simulation of Ideal REA System............................................................................................126
5.1.1 Simulation Procedure and Conditioning of Time Series.................................................126
5.1.2 b-Factors for Different Scalar Quantities......................................................................128
5.1.3 Relation between b-Factor and Bivariate Distribution...................................................131
5.1.4 EffectofaDeadband...................................................................................................135
5.2 Simulation of Non-Ideal REA Systems...................................................................................137
5.2.1 Measurement Errors in the Vertical Windspeed............................................................137
5.2.2 Delay Time of Conditional Sampling............................................................................140
5.2.3 Non-Constant Conditional Sampling Flow....................................................................144
5.3 Evaluation of Measured REA Fluxes.....................................................................................146
5.3.1 Calculations and Corrections........................................................................................146
5.3.2 Data Rejection.............................................................................................................148
5.3.3 Error Estimation..........................................................................................................149
6 DISCUSSION...................................................................................................................151
6.1 Comparison and Verification of Measured Fluxes...................................................................151
6.1.1 General Considerations................................................................................................151
6.1.2 Closure of the Surface Energy Budget..........................................................................152
6.1.3 Comparison with Enclosure Measurements...................................................................156
6.1.4 General Comparison of Micrometeorological Methods..................................................158
6.1.5 Selected Diurnal Cycles of CO2 Flux............................................................................162
6.2 General Validity of the REA Concept.....................................................................................166
6.2.1 Ideal b-Factor..............................................................................................................166
6.2.2 Deadband Effect..........................................................................................................169
6.2.3 Dependence on Joint Frequency Distribution.................................................................171
6.2.4 Applicability Outside the Inertial Sublayer...................................................................172
6.3 Analyser Resolution Requirements.........................................................................................174
6.3.1 Comparison of Different Methods for Bellheim Field Conditions...................................174
6.3.2 Requirements of REA Method for Specific Trace Gases...............................................177
6.4 Design of Conditional Sampling Systems...............................................................................180
6.4.1 Sampling Flow System for Online Analysis..................................................................180
6.4.2 Alternative Accumulation and Analysing Methods........................................................182
6.4.3 Windspeed Measurement and Valve Control.................................................................184
7 CONCLUSIONS..............................................................................................................187
7.1 Major Findings of the Present Study.......................................................................................187
7.2 Recommendations and Outlook..............................................................................................189
APPENDICES.........................................................................................................................191
Appendix A: Spectral Analysis of Turbulence Time Series............................................................191
A.I Harmonic Fourier Decomposition....................................................................................191
A.2 Unresolvable High and Low Frequencies.........................................................................192
A3 Calculation of Spectral Amplitudes..................................................................................193
A.4 Variance and Covariance Spectra....................................................................................194
A.5 Spectral Averaging and Statistical Significance................................................................196
A.6 Semi-empirical Form of Turbulence Spectra....................................................................197
A.7 Spectral Response of Turbulence Measurement Systems..................................................199
A.8 Spectral Attenuation of Covariance Measurements...........................................................203
Appendix B: Compilation of Flux Results.....................................................................................207
Appendix C: Symbols and Abbreviations......................................................................................214
REFERENCES........................................................................................................................217
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| spelling | Ammann, Christof Verfasser aut On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes Christof Ammann Zürich Geographisches Inst. ETH 1999 X, 229 S. Ill., zahlr. graph. Darst., Kt. txt rdacontent n rdamedia nc rdacarrier Zürcher geographische Schriften 73 Zsfassung in dt. Sprache Zugl.: Zürich, Techn. Hochsch., Diss., 1995 Atmospheric chemistry Methodology Greenhouse gases Measurement Turbulent diffusion (Meteorology) Gasvolumetrie (DE-588)4332601-8 gnd rswk-swf Spurengas (DE-588)4182608-5 gnd rswk-swf Erdoberfläche (DE-588)4113458-8 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Erdoberfläche (DE-588)4113458-8 s Spurengas (DE-588)4182608-5 s Gasvolumetrie (DE-588)4332601-8 s DE-604 Zürcher geographische Schriften 73 (DE-604)BV000016921 73 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=008427654&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Ammann, Christof On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes Zürcher geographische Schriften Atmospheric chemistry Methodology Greenhouse gases Measurement Turbulent diffusion (Meteorology) Gasvolumetrie (DE-588)4332601-8 gnd Spurengas (DE-588)4182608-5 gnd Erdoberfläche (DE-588)4113458-8 gnd |
| subject_GND | (DE-588)4332601-8 (DE-588)4182608-5 (DE-588)4113458-8 (DE-588)4113937-9 |
| title | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |
| title_auth | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |
| title_exact_search | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |
| title_full | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes Christof Ammann |
| title_fullStr | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes Christof Ammann |
| title_full_unstemmed | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes Christof Ammann |
| title_short | On the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |
| title_sort | on the applicability of relaxed eddy accumulation and common methods for measuring trace gas fluxes |
| topic | Atmospheric chemistry Methodology Greenhouse gases Measurement Turbulent diffusion (Meteorology) Gasvolumetrie (DE-588)4332601-8 gnd Spurengas (DE-588)4182608-5 gnd Erdoberfläche (DE-588)4113458-8 gnd |
| topic_facet | Atmospheric chemistry Methodology Greenhouse gases Measurement Turbulent diffusion (Meteorology) Gasvolumetrie Spurengas Erdoberfläche Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=008427654&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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