Sources of variability in the column photosynthetic cross section for Antarctic coastal waters
Sources of variability in the column photosynthetic cross section for Antarctic coastal waters
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南极沿海水域柱状光合截面的变异来源
DOI：
10.1029/96jc02439
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发表时间：
1997
影响因子：
--
通讯作者：
B. Prézelin
中科院分区：
文献类型：
--
作者：
H. Claustre;M. Moline;B. Prézelin
利用1991 ~ 1994年在南极Palmer站附近采集的高分辨率长期生态研究数据库，分析了柱光合截面（λ *，m2 g Chla-1）的变异性。日综合初级生产率与地面辐照度乘积之间的关系（QPAR（0 2 +））和叶绿素含量（低至0.1%QPAR（0 +））的叶绿素a-1的δ ~* 值为0.0695m2 g（r2 = 0.85，p < 0.001，n = 151），与温带和热带海洋的测定结果相似。但单次估算的平均值较高（0.10 9 ± 0.0 75 m2 g Chl a-1），极值范围超过50倍（0.0 0 9 - 0.488 m2 g Chl a-1）。考虑到目前在生物光学模型中使用的变量（例如，表面辐照度和叶绿素含量）和那些不是（分类组成）。随着时间的推移，观察到六倍的变化，并与这些极地采样点的入射辐照度特征的高季节性密切相关。在每日入射辐照度的变化，受云量和叶绿素含量的变化是负责额外的两倍的变化在100 *。最后，首次证明了该系统的分类依赖性。在相同的叶绿素含量和表面辐照度下，硅藻水华的叶绿素a平均值为0.114 ± 0.051m2gChla-1，隐藻优势种群的叶绿素a平均值为0.053 ± 0.011m2gChla-1。结果表明，估计南大洋的初级生产力的有效性，但强调需要解决特定类群的生物生理学，以更好地估计初级生产力较小的时空尺度。
Using a highly resolved Long Term Ecological Research (LTER) database collected near Palmer Station, Antarctica, from 1991 to 1994, the variability in the column photosynthetic cross section (Ψ*, m 2 g Chl a -1 ) was analyzed. The relationship between the daily integrated primary production rates versus the product of surface irradiance (Q PAR (0 2 + )) and the integrated chlorophyll content (down to to 0.1% Q PAR (0 + )) gave a Ψ* value of 0.0695 m 2 g Chl a -1 (r 2 = 0.85,p < 0.001, n = 151) which is similar to those determined for temperate and tropical seas. However, the average value of single Ψ* estimates is higher (0.109 ± 0.075 m 2 g Chl a -1 ) with extreme values extending over a fiftyfold range (0.009-0.488 m 2 g Chl a -1 ). The possible drivers of this variability are analyzed in detail, considering variables which are presently used in biooptical models (e.g., surface irradiance and chlorophyll content) and those which are not (taxonomic composition). A sixfold variation in Ψ* was observed with time of year and strongly associated with the high seasonality in incident irradiance characteristic of these polar sampling sites. Variability in daily incident irradiance as influenced by cloudiness and variation in chlorophyll content were responsible for an additional twofold variation in Ψ*. Finally, the taxonomic dependency of Ψ* was demonstrated for the first time. For identical chlorophyll content and surface irradiance, mean Ψ* values of 0.114 ± 0.051 m 2 g Chl a -1 were recorded for diatom blooms and 0.053 ± 0.011 m 2 g Chl a -1 for cryptophyte-dominated populations. Results illustrate the validity of Ψ*-based approaches for estimating primary production for the Southern Ocean but emphasize the need to address taxon-specific photophysiology to better estimate primary production on smaller spatio-temporal scales.