Use of change-point detection for friction-velocity threshold evaluation in eddy-covariance studies

被引：135

作者：

Barr, A. G. ^{[1
]}

Richardson, A. D. ^{[2
]}

Hollinger, D. Y. ^{[3
]}

Papale, D. ^{[4
]}

Arain, M. A. ^{[5
]}

Black, T. A. ^{[6
]}

Bohrer, G. ^{[7
]}

Dragoni, D. ^{[8
]}

Fischer, M. L. ^{[9
]}

Gu, L. ^{[10
]}

Law, B. E. ^{[11
]}

Margolis, H. A. ^{[12
]}

McCaughey, J. H. ^{[13
]}

Munger, J. W. ^{[14
,15
]}

Oechel, W. ^{[16
,17
]}

Schaeffer, K. ^{[18
]}

机构：

[1] Environm Canada, Div Climate Res, Saskatoon, SK S7N 3H5, Canada

[2] Harvard Univ Herbaria, Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA

[3] USDA, Forest Serv, No Res Stn, Durham, NH 03824 USA

[4] Univ Tuscia, Dept Innovat Biol Agrofood & Forest Syst DIBAF, I-01100 Viterbo, Italy

[5] McMaster Univ, Sch Geog & Earth Sci, Hamilton, ON L8S 4K1, Canada

[6] Univ British Columbia, Fac Land & Food Syst, Vancouver, BC V6T 1Z4, Canada

[7] Ohio State Univ, Dept Civil Environm & Geodet Engn, Columbus, OH 43210 USA

[8] Indiana Univ, Dept Geog, Bloomington, IN 47405 USA

[9] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA

[10] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA

[11] Oregon State Univ, Corvallis, OR 97331 USA

[12] Univ Laval, Ctr Etud Foret, Quebec City, PQ G1V 0A6, Canada

[13] Queens Univ, Dept Geog, Kingston, ON K7L 3N6, Canada

[14] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[15] Harvard Univ, Dept Earth & Planetary Sci, Cambridge, MA 02138 USA

[16] San Diego State Univ, Dept Biol, San Diego, CA 92182 USA

[17] San Diego State Univ, Global Change Res Grp, San Diego, CA 92182 USA

[18] Univ Colorado, Natl Snow & Ice Data Ctr, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

来源：

AGRICULTURAL AND FOREST METEOROLOGY | 2013年 / 171卷

基金：

美国国家科学基金会;

关键词：

Eddy-covariance; Friction-velocity filters; Uncertainty; Change-point detection; NET ECOSYSTEM EXCHANGE; CARBON-DIOXIDE FLUXES; LONG-TERM; INTERANNUAL VARIABILITY; WATER-VAPOR; TURBULENCE CHARACTERISTICS; UNDOCUMENTED CHANGEPOINTS; NORTHERN WISCONSIN; TEMPERATE FOREST; ATMOSPHERIC CO2;

D O I：

10.1016/j.agrformet.2012.11.023

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

The eddy-covariance method often underestimates fluxes under stable, low-wind conditions at night when turbulence is not well developed. The most common approach to resolve the problem of nighttime flux underestimation is to identify and remove the deficit periods using friction-velocity (u*) threshold filters (u*(Th)). This study modifies an accepted method for u*(Th) evaluation by incorporating change-point-detection techniques. The original and modified methods are evaluated at 38 sites as part of the North American Carbon Program (NACP) site-level synthesis. At most sites, the modified method produced u*(Th) estimates that were higher and less variable than the original method. It also provided an objective method to identify sites that lacked a u*(Th) response. The modified u*(Th) estimates were robust and comparable among years. Inter-annual u*(Th) differences were small, so that a single u*(Th) value was warranted at most sites. No variation in the u*(Th) was observed by time of day (dusk versus mid or late night), however, a few sites showed significant u*(Th) variation with time of year. Among-site variation in the u*(Th) was strongly related to canopy height and the mean annual nighttime u*. The modified u*(Th) estimates excluded a high fraction of nighttime data - 61% on average. However, the negative impact of the high exclusion rate on annual net ecosystem production (NEP) was small compared to the larger impact of underestimating the u*(Th). Compared to the original method, the higher u*(Th) estimates from the modified method caused a mean 8% reduction in annual NEP across all site-years, and a mean 7% increase in total ecosystem respiration (R-e). The modified method also reduced the u*(Th)-related uncertainties in annual NEP and R-e by more than 50%. These results support the use of u*(Th) filters as a pragmatic solution to a complex problem. (C) 2012 A.G. Barr. Published by Elsevier B.V. All rights reserved.

引用

页码：31 / 45

页数：15

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