文献
LI-7700 コスペクトル解析による証明
左のグラフは、周波数に対する昼間のコスペクトルを、異なる測定サイトにて比較した、10Hzサンプリングの平均化データです。 メタン（CH4）とCO2、H2O、気温のコスペクトルはほぼ同等にプロットされます。 これにより、LI-7700オープンパスCH4アナライザーは、これらの測定高度での乱流測定において、広い高周波数帯で、CH4濃度変動測定に適していることがわかります。
LI-7700オープンパスCH4アナライザーは、渦相関法測定に十分対応した、高速応答と精度を有したアナライザーであることが分かります。
【 関連文献 】
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日本を含め全世界で多くの実績のある信頼のシステム
LI-COR社 LI-7700, LI-7500, LI-7200シリーズは、これまでに世界中の様々な環境下で使用されています。 以下はその一部の実績で、文献として発表されているものです。日本を含め全世界で多くの実績のある信頼のシステムです。
| 使用測器 | 測定環境 | 文献詳細 |
|---|---|---|
| LI-7700, LI-7500 | 水田 | Iwata, H., Kosugi, Y., Ono, K., Mano, M., Sakabe, A., Miyata, A., and Takahashi,K. Cross-Validation of Open-Path and Closed-Path Eddy-Covariance Techniques for Observing Methane Fluxes. Boundary-Layer Meteorol (2014) 151:95–118 DOI 10.1007/s10546-013-9890-2 |
| LI-7700 | 水田 | Alberto, Ma C. R, Reiner Wassmann, Roland J. Buresh, James R. Quilty, Teodoro Q. Correa, Joseph M. Sandro, and Caesar A. R. Centeno. “Measuring Methane Flux from Irrigated Rice Fields by Eddy Covariance Method Using Open-Path Gas Analyzer.” Field Crops Research. 160 (2014): 12-21. |
| LI-7700, LI-7500A | 泥炭地 | Pypker, T.G, J.A Hribljan, R.C Chimner, P.A Moore, and J.M Waddington. “Shifting Environmental Controls on Ch4 Fluxes in a Sub-Boreal Peatland.” Biogeosciences Discussions. 10.7 (2013): 11757-11784. |
| LI-7700 | 高山湿地帯 | Lingfei Yu, Hao Wang, Guangshuai Wang, Weimin Song, Yao Huang, Sheng-Gong Li, Naishen Liang, Yanhong Tang, Jin-Sheng He, 2013. A comparison of methane emission measurements using eddy covariance and manual and automated chamber-based techniques in Tibetan Plateau alpine wetland. Environmental Pollution 181 (2013) 81-90. |
| LI-7500 | 農地 | Ma. Carmelita R. Alberto, Roland J. Buresh, Takashi Hirano, Akira Miyata, Reiner Wassmann, James R. Quilty, Teodoro Q. Correa Jr, Joseph Sandro. Carbon uptake and water productivity for dry-seeded rice and hybrid maize grown with overhead sprinkler irrigation. Field Crops Research 146 (2013) 51–65. |
| LI-7700, LI-7200 | 草原 | Sigrid Dengel, Peter E. Levy, John Grace, Stephanie K. Jones, and Ute M. Skiba (2011), Methane emissions from sheep pasture, measured with an open-path eddy covariance system. Global Change Biology, Volume 17, Issue 12, pg 3524-3533. |
| LI-7700, LI-7500A | 北極圏・ツンドラ気候 | Cove Sturtevant, Walt Oechel, Donatella Zona, and Craig Emerson (2011), Soil moisture control over autumn season methane flux, Arctic Coastal Plain of Alaska.Biogeosciences Discussions, 8, 6519-6554, doi:10.5194/bgd-8-6519-2011. |
| LI-7500A, LI-7200 | 森林 | Chad Hanson and Andres Schmidt (2011), Report from the AmeriFlux Quality Assurance Group: Who We Are and What We Do. FluxLetter: The Newsletter of FluxNET, Vol. 4 No. 1, April 2011 Burned Forest; Shrubland; Savannah; |
| LI-7200 | Hongyan Luo, Henry W. Loescher, Edward Ayres (2011), Prototyping NEON’s eddy covariance measurements: Comparison of two closed-path infra-red gas analyzers. 96th ESA Annual Meeting, August 8th, 2011. | |
| LI-7700, LI-7500A | 湖・水域 | Erik Sahlée, Anna Rutgersson, Eva Podgrajsek, and David Bastviken (2011), Eddy-covariance measurements of methane fluxes from a Swedish lake. Geophysical Research Abstracts, Vol. 13, EGU2011-11914-8, 2011, Vol. 13, EGU2011-11914-8, 2011. |
| LI-7500A | 高山 | J.L. Lewicki, G.E. Hilley, L. Dobeck, B.D.V. Marino, 2011. Eddy covariance imaging of diffuse volcanic CO2 emissions at Mammoth Mountain, CA, USA. Bull Volcanol doi 10.1007/s00445-011-0503-y. |
| LI-7500A | 海洋・水域 | S.D. Miller, C. Marandino, and E.S. Saltzman, 2010. Ship-based measurement of air-sea CO2 exchange by eddy covariance. Journal of Geophysical Research, Vol. 115, D02304, doi:10.1029/2009JD012193, 2010. |
| LI-7500A | 草原 | Liukang Xu, Dennis D. Baldocchi, 2004. Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California. Agricultural and Forest Meteorology 1232: 79-96. |
| LI-7700, LI-7500A | 湿地帯 | Matteo Detto, Joseph Verfaillie, Frank Anderson, Liukang Xu, Dennis Baldocchi, Comparing laser-based open- and closed-path gas analyzers to measure methane fluxes using the eddy covariance method, Agricultural and Forest Meteorology, Volume 151, Issue 10, 15 October 2011, Pages 1312-1324. Peatland; |
| LI-7200 | 農地・草原 | Burba, G., A. Schmidt, R. Scott, T. Nakai, J. Kathilankal, G. Fratini, C. Hanson, B. Law, D. McDermitt, R. Eckles, M. Furtaw, and M.Velgersdyk, 2012. Calculating CO2 and H2O eddy covariance fluxes from an enclosed gas analyzer using an instantaneous mixing ratio. Global Change Biology, 18(1): 385-399 Burned Forest; Shrubland; Savannah; Forest; Rye Grass; Grassland |
| LI-7200 | 火災森林 | Nakai T, Iwata H, Harazono Y (2011) Importance of mixing ratio for a long-term CO2 flux measurement with a closed-path system. Tellus B, DOI: 10.1111/j.1600-0889. 2011.00538.x |
| LI-7200 | 農地・ライ麦畑 | Burba, G., D. McDermitt, D. Anderson, M. Furtaw, and R. Eckles, 2010. Novel design of an enclosed CO2/H2O gas analyzer for Eddy Covariance flux measurements. Tellus B: Chemical and Physical Meteorology, 62(5): 743-748 |
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