Temporal variability in total, micro- and nano-phytoplankton primary production at a coastal site in the Western English Channel
Temporal variability in total, micro- and nano-phytoplankton primary production at a coastal site in the Western English Channel
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DOI：
10.1016/j.pocean.2015.04.017
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发表时间：
2015-09
影响因子：
4.1
通讯作者：
Morvan K. Barnes;G. Tilstone;D. Suggett;C. Widdicombe;J. Bruun;V. Martínez-Vicente;T. Smyth
中科院分区：
文献类型：
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作者：
Morvan K. Barnes;G. Tilstone;D. Suggett;C. Widdicombe;J. Bruun;V. Martínez-Vicente;T. Smyth
沿海地区的初级生产力和随后的碳循环对全球碳预算有重大影响。目前尚不清楚人为活动如何改变这些预算，但水文、生物地球化学和生物测量的沿海长期时间序列是更好地了解过去的驱动因素，从而预测未来沿海生态系统固碳的季节和年际变化的关键手段。使用最近开发的基于吸收的算法估计的2003年至2010年初级生产量的8年时间序列，用来确定西英吉利海峡(WEC)沿海站(L4)初级生产量变化的性质和程度。生产量的季节和年际变化分析表明，平均而言，微型和微型浮游植物占总固碳量的48%，微型浮游植物占52%。从2005年到2010年，观察到纳米和超微浮游植物初级生产量的下降，与冬季营养物质浓度下降和棕囊藻生物量下降相对应。微型浮游植物初级生产量(PPM)在时间序列上保持相对恒定，并在夏季降雨量高的时期增强。海表面温度的升高、风速和盐度的降低与晚些时候的PPM最大值有关。总而言之，这些趋势表明，预计未来气温的上升和风速的下降将推动晚些时候的春季产量，而预计的降水量增加也将使该地点的水华持续整个夏季。
Primary productivity and subsequent carbon cycling in the coastal zone have a significant impact on the global carbon budget. It is currently unclear how anthropogenic activity could alter these budgets but long term coastal time series of hydrological, biogeochemical and biological measurements represent a key means to better understand past drivers, and hence to predicting future seasonal and inter-annual variability in carbon fixation in coastal ecosystems. An 8-year time series of primary production from 2003 to 2010, estimated using a recently developed absorption-based algorithm, was used to determine the nature and extent of change in primary production at a coastal station (L4) in the Western English Channel (WEC). Analysis of the seasonal and inter-annual variability in production demonstrated that on average, nano- and pico-phytoplankton account for 48% of the total carbon fixation and micro-phytoplankton for 52%. A recent decline in the primary production of nano- and pico-phytoplankton from 2005 to 2010 was observed, corresponding with a decrease in winter nutrient concentrations and a decrease in the biomass ofPhaeocystissp. Micro-phytoplankton primary production (PPM) remained relatively constant over the time series and was enhanced in summer during periods of high precipitation. Increases in sea surface temperature, and decreases in wind speeds and salinity were associated with later spring maxima in PPM. Together these trends indicate that predicted increases in temperature and decrease in wind speeds in future would drive later spring production whilst predicted increases in precipitation would also continue these blooms throughout the summer at this site.