ORCHIDEE-PEAT (revision 4596), a model for northern peatland CO2, water, and energy fluxes on daily to annual scales-猫眼课题宝

DOI：

10.5194/gmd-11-497-2018

发表时间：

2017-09

期刊：

Geoscientific Model Development

影响因子：

5.1

通讯作者：

中科院分区：

地球科学2区

文献类型：

作者：

Chunjing Qiu;Dan Zhu;P. Ciais;B. Guenet;G. Krinner;S. Peng;M. Aurela;C. Bernhofer;C. Brümmer;S. Bret-Harte;H. Chu;Jiquan Chen;A. Desai;J. Dušek;E. Euskirchen;K. Fortuniak;L. Flanagan;T. Friborg;M. Grygoruk;S. Gogo;T. Grünwald;B. Hansen;D. Holl;E. Humphreys;M. Hurkuck;G. Kiely;Janina Klatt;L. Kutzbach;C. Largeron;F. Laggoun‐Défarge;M. Lund;P. Lafleur;Xuefei Li;I. Mammarella;L. Merbold;M. Nilsson;J. Olejnik;M. Ottosson‐Löfvenius;W. Oechel;F. Parmentier;M. Peichl;N. Pirk;O. Peltola;W. Pawlak;D. Rasse;J. Rinne;G. Shaver;H. Schmid;M. Sottocornola;R. Steinbrecher;T. Sachs;M. Urbaniak;D. Zona;K. Ziemblińska

抽象的。泥炭地储存了大量的碳，容易受到气候变化的影响。我们提出了一个修改后的版本的组织碳和水文动态生态系统（ORCHIDEE）的陆面模型模拟的水文，表面能，和CO2通量的泥炭地每天到每年的时间尺度。该模型在每个0.5°网格单元中包括一个单独的土壤瓦片，该土壤瓦片由全球泥炭地地图定义，并根据泥炭特有的土壤水力特性进行识别。包含一部分泥炭的网格单元内的非泥炭植被的径流被路由到这个泥炭土瓦，它保持浅水水位。地下水位位置将好氧分解与缺氧分解分开。该模型进行了评估，对涡流协方差（EC）观测从30个北方泥炭地网站，羧化的最大速率（Vcmax）进行了优化，在每个网站。关于短期的日常变化，模型性能良好的总初级生产力（GPP）（r ~ 2 = 0.76; Nash-Sutcliffe模型效率，MEF = 0.76）和生态系统呼吸（ER，r2 = 0.78，MEF = 0.75），潜热通量精度较低（LE，r2 = 0.42，MEF = 0.14）和生态系统CO2净交换（NEE，r2 = 0.38，MEF = 0.26）。GPP，ER，NEE和能量通量的季节变化在月尺度上表现出中等到高的r2值（0.57-0.86）。年平均GPP，ER，NEE和LE的空间跨站点梯度，分别达到0.93，0.89，0.27和0.71的r2值。地下水位（WT）的变化没有得到很好的预测（r2

Abstract. Peatlands store substantial amounts of carbon and are vulnerable to climate change. We present a modified version of the Organising Carbon and Hydrology In Dynamic Ecosystems (ORCHIDEE) land surface model for simulating the hydrology, surface energy, and CO2 fluxes of peatlands on daily to annual timescales. The model includes a separate soil tile in each 0.5° grid cell, defined from a global peatland map and identified with peat-specific soil hydraulic properties. Runoff from non-peat vegetation within a grid cell containing a fraction of peat is routed to this peat soil tile, which maintains shallow water tables. The water table position separates oxic from anoxic decomposition. The model was evaluated against eddy-covariance (EC) observations from 30 northern peatland sites, with the maximum rate of carboxylation (Vcmax) being optimized at each site. Regarding short-term day-to-day variations, the model performance was good for gross primary production (GPP) (r2 = 0.76; Nash–Sutcliffe modeling efficiency, MEF = 0.76) and ecosystem respiration (ER, r2 = 0.78, MEF = 0.75), with lesser accuracy for latent heat fluxes (LE, r2 = 0.42, MEF = 0.14) and and net ecosystem CO2 exchange (NEE, r2 = 0.38, MEF = 0.26). Seasonal variations in GPP, ER, NEE, and energy fluxes on monthly scales showed moderate to high r2 values (0.57–0.86). For spatial across-site gradients of annual mean GPP, ER, NEE, and LE, r2 values of 0.93, 0.89, 0.27, and 0.71 were achieved, respectively. Water table (WT) variation was not well predicted (r2

ORCHIDEE-PEAT (revision 4596), a model for northern peatland CO2, water, and energy fluxes on daily to annual scales

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