Repository Universitas Pakuan

Detail Karya Ilmiah Dosen

Asep Denih, Masahiro Tasumi, Yoshinori Shinohara, Shinichi Takeshita

Judul : Application of Scintillometer for Evaluating the Performance of GCOM-C ET Index Estimation Algorithm at a Forest Site.

Abstrak :
In this study, the accuracy of evapotranspiration estimated by the Global Change Observation Mission-Climate (GCOM-C) evapotranspiration index (ETindex) estimation model was evaluated using a scintillometer flux measurement dataset provided by the Idaho EPSCoR program, which was collected at an open lodgepole pine tree forest in eastern Idaho, United States. The scintillometer-measured sensible heat flux was quality-controlled, and evapotranspiration was computed using radiation data. The results of this analysis indicate that evapotranspiration was largely overestimated by the estimation model during summer. Owing to the overestimation in summer, the overall mean absolute error for the entire study period was 33 mm month-1, or 47% of the actual evapotranspiration. However, by conducting simple linear adjustment, the overall mean absolute error was improved to 14 mm month-1, or 19% of the actual ET. As the simple linear adjustment attempted in this study does not consider the seasonal trend in error, there is room to further improve the evapotranspiration estimation in the forest area by considering the seasonal effect during adjustment.

Tahun : 2019 Media Publikasi : Jurnal Internasional

Kategori : Jurnal No/Vol/Tahun : 2 / 24 / 2019

ISSN/ISBN : 1343-8646

PTN/S : University of Miyazaki Program Studi : ILMU KOMPUTER

Bibliography :

Allen, R.G., Pereira, L.S., Raes, D., and Smith, M. (1998): Crop Evapotranspiration - Guidelines for computing crop water requirements, FAO Irrigation and Drainage Paper 56, FAO, Rome, Italy.

Allen R.G., Pereira L.S., Howell T.A., and Jensen M.E. (2011): Evapotranspiration information reporting: I. Factors governing measurement accuracy. Agricultural Water Management, 98, pp.899–920.

Allen, R.G. (2011): Idaho EPSCoR Island Park Energy Balance Flux Site Description and Sensor Placement, Sept. 19, 2010 revised March 17, 2011, University of Idaho, 17p (http://www.kimberly.uidaho.edu/epscor/IslandPark/Island_Park_Site_Description.pdf visited Mar.7, 2019).

Anandakumar, K. (1999): Sensible heat flux over a wheat canopy: optical scintillometer measurements and surface renewal analysis estimations. Agricultural and Forest Meteorology, 96, pp.145-156.

Beyrich, F., de Bruin, H.A.R, Meijninger, W.M.L., Schipper, J.W., and Lohse, H. (2002): Results from one-year continuous operation of a large aperture scintillometer over a heterogeneous land surface. Boundary-Layer Meteorology, 105, pp.85-97.

Chehbouni, A., Kerr, Y.H., Watts, C., Hartogensis, O., Goodrich, D., Scott, R., Schieldge, J., Lee, K., Shuttleworth, W.J., Dedieu, G., and de Bruin, H.A.R. (1999): Estimation of area-average sensible heat flux using a large-aperture scintillometer during the semi-arid land-surface-atmosphere (SALSA) experiment. Water Resources Research, 35, pp.2505-2511.

Denih, A., Maeda, A., Tasumi, M., Shinohara, Y., and Takeshita, S. (2018): Evaluation of GCOM-C ETindex estimation algorithm at a lodgepole pine tree open forest in Idaho, USA, Journal of Rainwater Catchment Systems, 24, pp.9-14.

Liu, S.M., Xu, Z.W., Wang, W.Z., Jia, Z.Z., Zhu, M.J., Bai, Z.J., and Wang, J.M. (2011): A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem. Hydrology and Earth System Sciences, 15, pp.1291-1306.

Matsumoto, K. (2016): Measuring carbon and water fluxes in forest ecosystems. Japanese Journal of Ecology, 66, pp.515-544.

Tasumi, M., Kimura, R., Allen, R.G., Moriyama, M., and Trezza, R. (2016a): Development of the GCOM-C global ETindex estimation algorithm, Journal of Agricultural Meteorology, 72, pp.85-94.

Tasumi, M., Moriyama, M., Hirakawa, K., and Fujii, A. (2016b): Evaluation of the GCOM-C global ETindex estimation algorithm, Journal of Agricultural Meteorology, 72, pp.151-158.

Tasumi, M., Moriyama, M., Shinohara, Y. (2019): Application of GCOM-C SGLI for agricultural water management via field evapotranspiration, Paddy and Water Environment, (in printing).

Von Randow, C., Kruijt, B., Holtslag, A.A.M., and de Oliveira, M.B.L. (2008): Exploring eddy-covariance and large-aperture scintillometer measurements in an Amazonian rain forest. Agricultural and Forest Meteorology, 148, pp.680-690.

Wilson, K. Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier, P., Bernhofer, C., Ceulemans, R., Dolman, H., Field, C., Grelle, A., Ibrom, A., Law, B.E., Kowalski, A., Meyers, T., Moncrieff, J., Monson, R., Oechel, W., Tenhunen, J., Valentini, R., and Verma, S. (2002): Energy balance closure at FLUXNET sites, Agricultural and Forest Meteorology, 113, pp.223–243.

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Detail Karya Ilmiah Dosen

Asep Denih, Masahiro Tasumi, Yoshinori Shinohara, Shinichi Takeshita

Judul	:	Application of Scintillometer for Evaluating the Performance of GCOM-C ET Index Estimation Algorithm at a Forest Site.
Abstrak	:	In this study, the accuracy of evapotranspiration estimated by the Global Change Observation Mission-Climate (GCOM-C) evapotranspiration index (ETindex) estimation model was evaluated using a scintillometer flux measurement dataset provided by the Idaho EPSCoR program, which was collected at an open lodgepole pine tree forest in eastern Idaho, United States. The scintillometer-measured sensible heat flux was quality-controlled, and evapotranspiration was computed using radiation data. The results of this analysis indicate that evapotranspiration was largely overestimated by the estimation model during summer. Owing to the overestimation in summer, the overall mean absolute error for the entire study period was 33 mm month-1, or 47% of the actual evapotranspiration. However, by conducting simple linear adjustment, the overall mean absolute error was improved to 14 mm month-1, or 19% of the actual ET. As the simple linear adjustment attempted in this study does not consider the seasonal trend in error, there is room to further improve the evapotranspiration estimation in the forest area by considering the seasonal effect during adjustment.
Tahun	:	2019	Media Publikasi	:	Jurnal Internasional
Kategori	:	Jurnal	No/Vol/Tahun	:	2 / 24 / 2019
ISSN/ISBN	:	1343-8646
PTN/S	:	University of Miyazaki	Program Studi	:	ILMU KOMPUTER
Bibliography	:	Allen, R.G., Pereira, L.S., Raes, D., and Smith, M. (1998): Crop Evapotranspiration - Guidelines for computing crop water requirements, FAO Irrigation and Drainage Paper 56, FAO, Rome, Italy. Allen R.G., Pereira L.S., Howell T.A., and Jensen M.E. (2011): Evapotranspiration information reporting: I. Factors governing measurement accuracy. Agricultural Water Management, 98, pp.899–920. Allen, R.G. (2011): Idaho EPSCoR Island Park Energy Balance Flux Site Description and Sensor Placement, Sept. 19, 2010 revised March 17, 2011, University of Idaho, 17p (http://www.kimberly.uidaho.edu/epscor/IslandPark/Island_Park_Site_Description.pdf visited Mar.7, 2019). Anandakumar, K. (1999): Sensible heat flux over a wheat canopy: optical scintillometer measurements and surface renewal analysis estimations. Agricultural and Forest Meteorology, 96, pp.145-156. Beyrich, F., de Bruin, H.A.R, Meijninger, W.M.L., Schipper, J.W., and Lohse, H. (2002): Results from one-year continuous operation of a large aperture scintillometer over a heterogeneous land surface. Boundary-Layer Meteorology, 105, pp.85-97. Chehbouni, A., Kerr, Y.H., Watts, C., Hartogensis, O., Goodrich, D., Scott, R., Schieldge, J., Lee, K., Shuttleworth, W.J., Dedieu, G., and de Bruin, H.A.R. (1999): Estimation of area-average sensible heat flux using a large-aperture scintillometer during the semi-arid land-surface-atmosphere (SALSA) experiment. Water Resources Research, 35, pp.2505-2511. Denih, A., Maeda, A., Tasumi, M., Shinohara, Y., and Takeshita, S. (2018): Evaluation of GCOM-C ETindex estimation algorithm at a lodgepole pine tree open forest in Idaho, USA, Journal of Rainwater Catchment Systems, 24, pp.9-14. Liu, S.M., Xu, Z.W., Wang, W.Z., Jia, Z.Z., Zhu, M.J., Bai, Z.J., and Wang, J.M. (2011): A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem. Hydrology and Earth System Sciences, 15, pp.1291-1306. Matsumoto, K. (2016): Measuring carbon and water fluxes in forest ecosystems. Japanese Journal of Ecology, 66, pp.515-544. Tasumi, M., Kimura, R., Allen, R.G., Moriyama, M., and Trezza, R. (2016a): Development of the GCOM-C global ETindex estimation algorithm, Journal of Agricultural Meteorology, 72, pp.85-94. Tasumi, M., Moriyama, M., Hirakawa, K., and Fujii, A. (2016b): Evaluation of the GCOM-C global ETindex estimation algorithm, Journal of Agricultural Meteorology, 72, pp.151-158. Tasumi, M., Moriyama, M., Shinohara, Y. (2019): Application of GCOM-C SGLI for agricultural water management via field evapotranspiration, Paddy and Water Environment, (in printing). Von Randow, C., Kruijt, B., Holtslag, A.A.M., and de Oliveira, M.B.L. (2008): Exploring eddy-covariance and large-aperture scintillometer measurements in an Amazonian rain forest. Agricultural and Forest Meteorology, 148, pp.680-690. Wilson, K. Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier, P., Bernhofer, C., Ceulemans, R., Dolman, H., Field, C., Grelle, A., Ibrom, A., Law, B.E., Kowalski, A., Meyers, T., Moncrieff, J., Monson, R., Oechel, W., Tenhunen, J., Valentini, R., and Verma, S. (2002): Energy balance closure at FLUXNET sites, Agricultural and Forest Meteorology, 113, pp.223–243.
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