Seasonal and interannual variability of ocean color and composition of phytoplankton communities in the North Atlantic, equatorial Pacific and South Pacific
Seasonal and interannual variability of ocean color and composition of phytoplankton communities in the North Atlantic, equatorial Pacific and South Pacific
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DOI：
10.1016/j.dsr2.2003.07.018
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发表时间：
2004-01-01
影响因子：
3
通讯作者：
Bécu, G
中科院分区：
文献类型：
--
作者：
Dandonneau, Y;Deschamps, PY;Bécu, G
使用傅立叶分析法对1998年至2001年SeaWiFS第三级叶绿素浓度的月平均数据进行全球分析，以确定世界海洋所有部分时间变化的主要模式。在大多数地区，季节性变化超过年际变化，每年花盛的时间一般可以用当地的太阳能循环来解释。研究期间受到1997-1998年非常强烈的厄尔尼诺后期后果的影响。在这一重大事件之后，不同地点恢复正常状况的模式各不相同。在赤道，叶绿素浓度异常高，在1998年，然后下降，而远离赤道，它是低的，在1998年，随后增加时，赤道上涌沃茨向极地蔓延。这导致这两个区域随时间的线性趋势相反。其他值得注意的例子，年际变化的开放海洋中的Trichodesmium的爆发，在南半球的夏季在西南热带太平洋，或异常高的叶绿素浓度在5degreesS在印度洋强烈的Madden-Julian振荡。从1999年11月到2001年8月，由于从一艘机会船的表面采样，每季度收集的实地数据，记录了浮游植物种群的演替，这些种群是叶绿素丰度季节性周期的基础。事实上，浮游植物的组成决定了各个海洋省份生物碳泵的效率。我们集中在北大西洋，加勒比海，巴拿马湾，赤道太平洋，南太平洋副热带环流和西南热带太平洋的实地数据已经收集。这些数据是色素（用高效液相色谱法和荧光分光光度法测量）和微型浮游生物丰度（原绿球藻、聚球藻、微型真核生物和细菌）的定量清单。在温带沃茨中，微型浮游生物（如色素指数所示）全年占主导地位，而在热带沃茨中，微型浮游生物占主导地位。较大的微型浮游生物，使世界上大部分海洋出口产品的深度，很少超过20%的色素生物量在近海沃茨采样这些巡航。大多数情况下，在两个不同年份的同一季节进行的巡航之间的浮游植物组成存在很大差异。(C)2004 Elsevier Ltd.保留所有权利。
Monthly averaged level-3 SeaWiFS chlorophyll (Chl) concentration data from 1998 to 2001 are globally analyzed using Fourier's analysis to determine the main patterns of temporal variability in all parts of the world ocean. In most regions, seasonal variability dominates over interannual variability, and the timing of the yearly bloom generally can be explained by the local cycle of solar energy. The studied period was influenced by the late consequences of the very strong El Nino of 1997-1998. After this major event, the recovery to normal conditions followed different patterns at different locations. At the equator, Chl concentration was abnormally high in 1998, and then decreased, while away from the equator it was low in 1998 and subsequently increased when equatorial upwelled waters spread poleward. This resulted in opposed linear trends with time in these two zones. Other noticeable examples of interannual variability in the open ocean are blooms of Trichodesmium that develop episodically in austral summer in the south-western tropical Pacific, or abnormally high Chl concentration at 5degreesS in the Indian Ocean after a strong Madden-Julian oscillation. Field data collected quarterly from November 1999 to August 2001, owing to surface sampling from a ship of opportunity, are presented to document the succession of phytoplankton populations that underlie the seasonal cycles of Chl abundance. Indeed, the composition of the phytoplankton dictates the efficiency of the biological carbon pump in the various oceanic provinces. We focus on the North Atlantic, Caribbean Sea, Gulf of Panama, equatorial Pacific, South Pacific Subtropical Gyre and south-western tropical Pacific where field data have been collected. These data are quantitative inventories of pigments (measured by high performance liquid chromatography and spectrofluorometry) and picoplankton abundance (Prochlorococcus, Synechococcus, picoeucaryotes and bacteria). There is a contrast between temperate waters where nanoplankton (as revealed by pigments indexes) dominate during all the year, and tropical waters where picoplankton dominate. The larger microplankton, which make most of the world ocean export production to depth, rarely exceed 20% of the pigment biomass in the offshore waters sampled by these cruises. Most of the time, there are large differences in the phytoplankton composition between cruises made at the same season on two different years. (C) 2004 Elsevier Ltd. All rights reserved.