Carbon:Chlorophyll ratios of Subarctic Pacific surface waters

We present optically-derived estimates of phytoplankton carbon (Cphyto) and chlorophyll a concentration (Chl) across a wide range of productivity and hydrographic regimes in the Subarctic Pacific Ocean. Our high-frequency measurements capture changes in Cphyto and Chl across regional gradients in macro- and micronutrient limitation, and sub-mesoscale hydrographic frontal zones. Throughout the majority of our survey region, carbon to chlorophyll ratios (Cphyto:Chl) ranged between 50-100. Lower values (10-20) were constrained to the highly productive coastal upwelling system along Vancouver Island, whereas higher estimated values (>200) were found directly off the southern British Columbia continental shelf. Further offshore, Cphyto:Chl was less variable, ranging from 50-80 in high nutrient low Chl (HNLC) waters in June, and from 80-120 in the Gulf of Alaska in July. […]

本报告呈现了基于光学方法得出的亚北极太平洋海域不同生产力及水文状况下的浮游植物碳（Cphyto）和叶绿素a浓度（Chl）的估算数据。我们采用高频次测量方法，捕捉了Cphyto和Chl在区域尺度上受宏量元素和微量元素限制以及亚中尺度水文锋面区域的变化。在整个调查区域的大部分范围内，碳与叶绿素比值（Cphyto:Chl）介于50-100之间。较低值（10-20）局限于温哥华岛沿岸的高生产力上升流系统，而较高的估算值（>200）则在加拿大不列颠哥伦比亚省南部的陆架直接附近发现。更远离海岸的地方，Cphyto:Chl的变异性较小，在六月份的高营养低叶绿素（HNLC）水域中为50-80，而在七月份的阿拉斯加湾中为80-120。