Basic characteristics of canopy turbulence in a homogeneous rice paddy

被引:11
作者
Hong, JK
Kim, J
Miyata, A
Harazono, Y
机构
[1] Yonsei Univ, Global Environm Lab, Seoul 120749, South Korea
[2] Yonsei Univ, Dept Atmospher Sci, Lab Atmospher Modeling Res, Seoul 120749, South Korea
[3] Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
[4] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK USA
关键词
rice; canopy turbulence; coherent structure; countergradient flux; stability effect;
D O I
10.1029/2002JD002223
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
To assess the interactions of key ecosystems with the overlying atmosphere, it is fundamental to understand the turbulence structure within and above their canopies. Rice is a staple crop particularly in Asia, and, yet, information on canopy turbulence of this vital food resource is limited by the scarcity of field measurement. The purpose of this study was to examine whether rice canopy shows an organized turbulence structure and, if so, whether such coherent structure scales to the patterns found in other canopies. Using the field data obtained during the 1996 International Rice Experiment (IREX96), we computed turbulence statistics such as mean, standard deviation, covariance, skewness, kurtosis, and turbulence length scales. When appropriately scaled with canopy height and friction velocity, these turbulence statistics showed coherent structures, which agreed well within the ranges of those reported for other canopies. Both quadrant and spectrum analyses confirmed that the intermittent and energetic eddies with length scale of the order of canopy height dominated the transfer processes within and above rice canopy. Such results were further substantiated by the countergradient fluxes observed during the IREX96. Furthermore, within-canopy turbulence became more intermittent under stable conditions.
引用
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页数:20
相关论文
共 93 条
[1]   COMPARISON OF TURBULENCE STATISTICS WITHIN 3 BOREAL FOREST CANOPIES [J].
AMIRO, BD .
BOUNDARY-LAYER METEOROLOGY, 1990, 51 (1-2) :99-121
[2]   DRAG COEFFICIENTS AND TURBULENCE SPECTRA WITHIN 3 BOREAL FOREST CANOPIES [J].
AMIRO, BD .
BOUNDARY-LAYER METEOROLOGY, 1990, 52 (03) :227-246
[3]   STATISTICS OF ATMOSPHERIC-TURBULENCE WITHIN A NATURAL BLACK SPRUCE FOREST CANOPY [J].
AMIRO, BD ;
DAVIS, PA .
BOUNDARY-LAYER METEOROLOGY, 1988, 44 (03) :267-283
[4]  
[Anonymous], 1955, J AGRIC METEOROL, DOI DOI 10.2480/AGRMET.11.18
[5]   RESPONSE OF A TURBULENT BOUNDARY LAYER TO A STEP CHANGE IN SURFACE ROUGHNESS .1. SMOOTH TO ROUGH [J].
ANTONIA, RA ;
LUXTON, RE .
JOURNAL OF FLUID MECHANICS, 1971, 48 (AUG27) :721-&
[6]  
Baldocchi D.D., 1993, Scaling physiological processes: leaf to globe, P77, DOI DOI 10.1016/B978-0-12-233440-5.50011-7
[7]   A SPECTRAL AND LAG-CORRELATION ANALYSIS OF TURBULENCE IN A DECIDUOUS FOREST CANOPY [J].
BALDOCCHI, DD ;
MEYERS, TP .
BOUNDARY-LAYER METEOROLOGY, 1988, 45 (1-2) :31-58
[8]   TURBULENCE STRUCTURE IN A DECIDUOUS FOREST [J].
BALDOCCHI, DD ;
MEYERS, TP .
BOUNDARY-LAYER METEOROLOGY, 1988, 43 (04) :345-364
[9]   TURBULENCE IN AN ALMOND ORCHARD - VERTICAL VARIATIONS IN TURBULENT STATISTICS [J].
BALDOCCHI, DD ;
HUTCHISON, BA .
BOUNDARY-LAYER METEOROLOGY, 1987, 40 (1-2) :127-146
[10]   Turbulent flux measurements above and below the overstory of a boreal aspen forest [J].
Blanken, PD ;
Black, TA ;
Neumann, HH ;
Den Hartog, G ;
Yang, PC ;
Nesic, Z ;
Staebler, R ;
Chen, W ;
Novak, MD .
BOUNDARY-LAYER METEOROLOGY, 1998, 89 (01) :109-140