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首页> 外文期刊>ICES Journal of Marine Science >Temporal variability of 10-year global SeaWiFS time-series of phytoplankton chlorophyll a concentration
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Temporal variability of 10-year global SeaWiFS time-series of phytoplankton chlorophyll a concentration

机译：浮游植物叶绿素a浓度的10年全球SeaWiFS全球时间序列的时间变异性

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摘要

The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) global dataset now offers a 10-year time-series of a consistent, well-calibrated, ocean colour record suitable to analyse temporal variability. The relative importance of the seasonal term in the chlorophyll a (Chl a) concentration signal is first assessed using statistical techniques of temporal decomposition. The emphasis is on the Census method II (X-11) approach, which allows year-to-year variations in the seasonal component. The seasonality detected in the SeaWiFS Chl a record is analysed through a generic province-based classification of marine ecosystems and at global scale and is found very variable spatially. Working with 5'-resolution gridded Chl a products, the contribution of the seasonal component derived from X-11 amounts to 64% of the total variance, compared with only 36% if a fixed annual cycle is assumed. The capacity of X-11 to capture interannual variations in seasonality is used to diagnose the stability of the Chl a seasonal cycle. Finally, linear changes in Chl a concentration observed after a decade of continuous ocean colour record agree globally with previous observations on shorter series. Significant changes of both signs are detected in various regions of the world's oceans, but primarily a general decrease of Chl a in the mid-ocean gyres.
机译：海景宽视野传感器（SeaWiFS）全球数据集现在提供了十年的时间序列，该序列是一致的，经过良好校准的海洋颜色记录，适合于分析时间变化。首先使用时间分解的统计技术评估季节术语在叶绿素a（Chl a）浓度信号中的相对重要性。重点在于人口普查方法II（X-11）方法，该方法允许季节性成分逐年变化。通过基于省份的海洋生态系统通用分类并在全球范围内分析SeaWiFS Chl a记录中检测到的季节性，发现其空间变化很大。使用5'分辨率网格化Chla产品，从X-11得出的季节性分量的贡献占总方差的64％，而如果假定固定的年度周期，则只有36％。 X-11捕获季节性的年际变化的能力用于诊断Chl季节周期的稳定性。最后，在连续十年的海洋颜色记录后观察到的Chl a浓度的线性变化总体上与先前关于较短序列的观察结果一致。在世界海洋的各个区域都发现了这两种迹象的显着变化，但主要是中海回旋中Chla的总体下降。

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  • 来源
    《ICES Journal of Marine Science》 |2009年第7期|1547-1556|共10页
  • 作者

    V. Vantrepotte; F. Melin;

  • 作者单位

    Joint Research Centre, European Commission, Global Environment Monitoring Unit, Institute for Environment and Sustainability, Via Fermi, 2749, TP 272, 21027 Ispra, Italy;

    Joint Research Centre, European Commission, Global Environment Monitoring Unit, Institute for Environment and Sustainability, Via Fermi, 2749, TP 272, 21027 Ispra, Italy;

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  • 正文语种 eng
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  • 关键词

    chlorophyll a; global scale; seasonality; SeaWiFS; time-series; trend;

    机译：叶绿素a;世界规模;季节性SeaWiFS;时间序列;趋势;

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