A Generalized Model of Hourly Net Ecosystem Exchange (NEE) for Florida Everglades Freshwater Wetlands

A Generalized Model of Hourly Net Ecosystem Exchange (NEE) for Florida Everglades Freshwater Wetlands
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佛罗里达大沼泽地淡水湿地每小时净生态系统交换(NEE)的广义模型

DOI:
10.1007/s13157-017-0928-y
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发表时间:
2017
期刊:
影响因子:
2
通讯作者:
Abdul-Aziz, Omar I.
Abdul-Aziz, Omar I.
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Ishtiaq, Khandker S.;Abdul-Aziz, Omar I.

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基于佛罗里达大沼泽地淡水湿地的逐时净生态系统交换(NEE)日循环,建立了一个广义模型。两个不同的湿地(短水期和长水期)全年NEE的日循环通过相应的日和地点特定的NEE参考观测归一化,得到一个共同的无量纲循环。利用扩展随机谐波分析(ESHA)对2008 - 2013年NEE逐时涡旋协方差观测数据对模型进行了校正和验证。该模型涉及5个参数,在不同的日期、年份和地点之间呈现出较窄的范围,具有时空稳健性。对所有校准日的每日估计值取平均值,以计算特定站点的集合参数集。进一步在四个中午参考时间(上午11点到下午2点)对站点特定的集合参数进行平均,以获得广义的集合参数集。使用特定地点和广义参数集估计的每小时NEE表明该模型具有良好的性能(例如,Nash-Sutcliffe效率,NSE = 0.66-0.89)。该模型以三种独立格式表示,包括一个Excel电子表格,以从各自的单一参考观测中模拟所需朱利安日和年的每小时NEE。
A generalized model is presented to estimate the diurnal cycle of hourly net ecosystem exchange (NEE) based on a corresponding single reference-time observation from the Florida Everglades freshwater wetlands. The year-round diurnal cycles of NEE for two different (short vs. long hydroperiod) marsh sites were normalized by the corresponding day- and site-specific reference observations of NEE to obtain a common dimensionless cycle. An extended stochastic harmonic analysis (ESHA) was utilized to calibrate and validate the model with hourly eddy-covariance observations of NEE during 2008–13. The model involved five parameters, which exhibited spatiotemporal robustness by collapsing into narrow ranges among different days, years and sites. The daily estimates were averaged over all calibration days to calculate the site-specific ensemble parameter sets. The site-specific ensemble parameters were further averaged over four mid-day reference times (11 A.M. to 2 P.M.) across sites to obtain a generalized ensemble parameter set. Estimated hourly NEE using the site-specific and the generalized parameter sets indicated a good performance of the model (e.g., Nash-Sutcliffe Efficiency, NSE = 0.66–0.89). The model is represented in three standalone formats, including an Excel spreadsheet, to simulate the hourly NEE for the desired Julian days and years from the respective single reference observations.
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