稻麥輪作農田近地層湍流通量計算方案對比研究
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國家重點研發計劃項目(2023YFC3706303)和國家自然科學基金面上項目(42075072)資助


Comparative Study of Near-Surface Turbulent Flux Calculation Schemes in Rice-Wheat Crop Rotation Farmland
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    摘要:

    稻麥輪作農田是我國典型農田類型,其模擬效果對我國農田氣候模擬具有重要參考價值。氣候中尺度模擬結果對近地層通量極為敏感,選擇合適的通量計算方案對模擬效果至關重要。因此,對比分析稻麥輪作農田下不同的通量計算方案具有重要意義。本文選取了8種具有代表性的近地層湍流通量計算方案,采用壽縣國家氣候觀象臺實測資料對比分析了各方案在稻麥輪作農田的計算特征和差異。結果表明,在不同穩定度和不同風速情況下,各方案的誤差特征各異。本文基于歸一化標準差綜合評價了各方案的準確度,總體而言,所有方案的動量通量總體平均歸一化平均差為0.536,其中SS14(Sharan和Srivastava,2014年)方案最大為0.575,SS20(Sharan和Srivastava等,2020年)方案最小為0.517;所有方案的感熱通量總體平均歸一化標準差為0.638,其中GLGS20(Gryanik等,2020年)方案最大為0.871,SS14方案最小為0.476。此外,本研究還給出了稻麥輪作農田不同穩定層結和不同風速情況下各通量計算方案的誤差特征。本文的研究結論,可為準確計算近地層湍流通量提供支撐。

    Abstract:

    Rice-wheat rotation farmland is a typical type of farmland understory in China, and its simulation effect has important reference value for climate modelling of agricultural fields in our country. The results of mesoscale climate simulation are highly sensitive to the calculation schemes of surface fluxes, and selecting appropriate flux calculation schemes is crucial for simulation accuracy. Therefore, it is of great significance to compare and analyse different flux calculation schemes under the rice-wheat crop rotation system. In this paper, eight representative near-surface turbulent flux calculation schemes are selected, and the measured data from the Shouxian National Climatological Observatory are used to compare and analyse the calculation characteristics and differences of the schemes in the underlay of rice-wheat rotation farmland using the method of normalised standard deviation. The results show that the error characteristics of the schemes are different under different stabilised stratification conditions and wind speed conditions. In general, the overall average normalised mean difference of momentum flux of all schemes is 0.536, of which the maximum is 0.575 for the Sharan and Srivastava, 2014 scheme (SS14 scheme) and the minimum is 0.517 for the Sharan and Srivastava et al., 2020 scheme; and the overall average normalised standard deviation of sensible heat flux of all schemes is 0.638, of which the maximum is 0.871 for the Gryanik et al., 2020 scheme and the minimum is 0.476 for the SS14 scheme. In addition, this study is also giving the error characteristics of each flux calculation scheme under different stratification conditions and wind speed conditions under the rice-wheat rotation farmland, and finally, this paper is giving recommendations for the selection of turbulent flux calculation schemes for the rice-wheat rotation farmland, for the momentum fluxes, under the unstable stratification conditions, it is recommended to use the SS14 or Li et al., 2014 & 2015 schemes (Li1415 scheme), the Businger, 1971 scheme is recommended for weakly stabilised stratification, and Wang et al., 2002 scheme (Wa02 scheme) is recommended for strongly stabilised stratification; for heat flux calculation, Li et al., 2010 scheme (Li10 scheme) is recommended for unstable and weakly stabilised stratification and Li1415 scheme is recommended for strongly stabilised stratification. Under low wind conditions, it is recommended to use SS14 or Li1415 scheme to calculate the momentum flux and Li10 scheme to calculate the sensible heat flux; under strong wind conditions, it is recommended to use Li1415 scheme to calculate the momentum flux and Gryanik and Lüpkes, 2018 scheme or Wa02 scheme to calculate the sensible heat flux. These findings of this paper support the accurate calculation of near-surface layer turbulent flux.

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劉昕曄,李煜斌.稻麥輪作農田近地層湍流通量計算方案對比研究[J].氣象科技,2024,52(3):434~445

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  • 收稿日期:2023-11-18
  • 定稿日期:2023-12-27
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  • 在線發布日期: 2024-06-25
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