Carbon‐based primary productivity modeling with vertically resolved photoacclimation
Carbon‐based primary productivity modeling with vertically resolved photoacclimation
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DOI：
10.1029/2007gb003078
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发表时间：
2008-06
影响因子：
5.2
通讯作者：
T. Westberry;M. Behrenfeld;D. Siegel;E. Boss
中科院分区：
文献类型：
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作者：
T. Westberry;M. Behrenfeld;D. Siegel;E. Boss
净初级生产力（NPP）通常被建模为叶绿素浓度（Chl）的函数，即使它一直被认为是细胞内叶绿素含量的变化，从光驯化和营养胁迫混淆Chl和浮游植物生物量之间的关系。以前有人提出，在颗粒大小分布不变或浮游植物碳生物量（C）与颗粒有机碳总量之间关系相对稳定的条件下，卫星对后向散射的估计可与C相关。C和Chl可以一起用来描述生理状态（通过Chl：C比率的变化）和NPP。在这里，我们完全开发了基于碳的生产力模型（CbPM），以包括关于地下光场和硝化深度的信息，以参数化整个水柱的光适应和营养胁迫。这种深度分辨方法产生的生物特性（叶绿素，C，NPP）与观察结果大致一致。使用辐照衍生产品、浮游植物叶绿素：碳比和测量的NPP率的区域原位数据集对CbPM进行验证。基于CbPM的全球NPP分布在空间和时间上都与以前基于Chl的估计有显着差异，因为生物量和生理对全球Chl场的影响之间存在差异。新模型得出全球海洋每年的面积综合水柱产量为1052 Pg C a−1。
Net primary production (NPP) is commonly modeled as a function of chlorophyll concentration (Chl), even though it has been long recognized that variability in intracellular chlorophyll content from light acclimation and nutrient stress confounds the relationship between Chl and phytoplankton biomass. It was suggested previously that satellite estimates of backscattering can be related to phytoplankton carbon biomass (C) under conditions of a conserved particle size distribution or a relatively stable relationship between C and total particulate organic carbon. Together, C and Chl can be used to describe physiological state (through variations in Chl:C ratios) and NPP. Here, we fully develop the carbon‐based productivity model (CbPM) to include information on the subsurface light field and nitracline depths to parameterize photoacclimation and nutrient stress throughout the water column. This depth‐resolved approach produces profiles of biological properties (Chl, C, NPP) that are broadly consistent with observations. The CbPM is validated using regional in situ data sets of irradiance‐derived products, phytoplankton chlorophyll:carbon ratios, and measured NPP rates. CbPM‐based distributions of global NPP are significantly different in both space and time from previous Chl‐based estimates because of the distinction between biomass and physiological influences on global Chl fields. The new model yields annual, areally integrated water column production of ∼52 Pg C a−1 for the global oceans.