Satellite remote sensing of primary productivity in the Bering and Chukchi Seas using an absorption-based approach
Satellite remote sensing of primary productivity in the Bering and Chukchi Seas using an absorption-based approach
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DOI：
10.1093/icesjms/fss111
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发表时间：
2012-09-01
影响因子：
3.3
通讯作者：
Saitoh, Sei-ichi
中科院分区：
文献类型：
--
作者：
Hirawake, Toru;Shinmyo, Katsuhito;Saitoh, Sei-ichi
海洋颜色遥感已被用于研究北冰洋的初级生产力。然而，由于有色溶解有机物(CDOM)和非藻类颗粒物(NAP)的干扰，浮游植物叶绿素a(Chla)的预测并不准确。为了提高估算精度，基于浮游植物吸收的初级生产力模型(ABPM)被应用于白令海和楚科奇海。利用海面遥感反射率(R-Rs)准确确定了浮游植物的吸收系数，消除了CDOM和NAP在初级生产力(PPeu)估算中的影响。用ABPM从原位R-Rs中恢复的PPeu满足测量值的2倍。由中分辨率成像光谱仪R-RS数据估算的PPEU在历史值范围内。这些估算的PPeu值不到基于Chla的模型的一半，两个模型之间的差异反映了CDOM和NAP吸收的影响。2002-2010年期间8月和9月的年际变化表明，初级生产力有所提高。2007年的增幅尤其大，与2006年相比增加了1.51-2.71倍。这里检测到的生产率的显著时间增长与早期的研究不同，早期的研究发现该地区几乎没有变化。
Ocean colour remote sensing has been utilized for studying primary productivity in the Arctic Ocean. However, phytoplankton chlorophyll a (Chl a) is not predicted accurately because of the interference of coloured dissolved organic matter (CDOM) and non-algal particles (NAP). To enhance the estimation accuracy, a phytoplankton absorption-based primary productivity model (ABPM) was applied to the Bering and Chukchi Seas. The phytoplankton absorption coefficient was determined correctly from sea surface remote sensing reflectance (R-rs) and reduced the effect of CDOM and NAP in primary productivity (PPeu) estimates. PPeu retrieved from in situ R-rs using the ABPM satisfied a factor of 2 of measured values. PPeu estimated from the Moderate Resolution Imaging Spectroradiometer R-rs data were within the range of historical values. These estimated PPeu values were less than half of those of the model based on Chl a, and the difference between the two models reflected the influence of CDOM and NAP absorptions. Interannual variation in August and September over the period 2002-2010 showed an increase in primary productivity. The increase in 2007 was especially large, by a factor of 1.51-2.71, compared with 2006. The significant temporal increase in productivity detected here differs from earlier studies that detected little, if any, change in the region.