Algal blooming patterns and anomalies in the Mediterranean Sea as derived from the SeaWiFS data set (1998-2003)
Algal blooming patterns and anomalies in the Mediterranean Sea as derived from the SeaWiFS data set (1998-2003)
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DOI：
10.1016/j.rse.2007.10.014
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发表时间：
2008-08-15
影响因子：
13.5
通讯作者：
Ndiaye, Mapathe
中科院分区：
文献类型：
--
作者：
Barale, Vittorio;Jaquet, Jean-Michel;Ndiaye, Mapathe
光学遥感可以监测边缘海和封闭海浮游植物生长的空间和时间异质性，这是了解其生态系统动态的一个关键因素。SeaWiFS衍生的（1998-2003年）数据被用来监测地中海盆地的藻类水华模式和异常。计算了6年来叶绿素浓度的年平均值和月平均值，并得出了气候平均值。通过计算年度和月度叶绿素异常来评估数据集的统计变异性，作为每个单独年/月与相应气候年/月之间的差异。叶绿素场的空间和时间模式似乎与地中海一般海洋气候相一致，而叶绿素异常描述的趋势和“热点”的藻华。分析表明，叶绿素值的年度和月度平均值，增加的负趋势的叶绿素异常的盆地内部，和西北部的春季水华的预期，在历史CZCS（1979-1985年）的数据相比，一般减少。这些现象被解释为营养限制增加的症状，这是由于盆地分层更加稳定，垂直混合减少，符合过去25年地中海的总体变暖趋势。高叶绿素的模式，再加上叶绿素异常的积极趋势，经常在近海岸的热点，似乎与大陆径流和不断增长的“生物活力”在这些网站，即有毒或有害的藻华，在西北部和沿海渔业，在东南部的加剧。(C)2008年爱思唯尔公司All rights reserved.
Optical remote sensing allows to monitor the space and time heterogeneity of phytoplankton growth in marginal and enclosed seas, a factor critical to understanding their ecosystem dynamics. SeaWiFS-derived (1998-2003) data were used to monitor algal blooming patterns and anomalies in the Mediterranean basin. Yearly and monthly means of chlorophyll-like pigment concentration (chl) were computed for the 6 years available, and climatological means derived. The data set statistical variability was assessed by computing yearly and monthly chl anomalies, as the difference between each individual year/month and the corresponding climatological year/month. The space and time patterns of the chl field appear to concur with the Mediterranean general oceanographic climate, while the chl anomalies describe trends and "hotspots" of algal blooming. The analysis shows a general decrease of chl values in the yearly and monthly means, an increasing negative trend of chl anomalies over the basin interior, and the anticipation of the north-western spring bloom, in comparison to what seen in historical CZCS (1979-1985) data. These have been interpreted as symptoms of an increased nutrient-limitation, resulting from reduced vertical mixing due to a more stable stratification of the basin, in line with the general warming trend of the Mediterranean Sea in the last 25 years. The patterns of high chl, coupled to a positive trend of chl anomalies, recurring at near-coastal hotspots, appear to be linked to continental runoff and to a growing "biological dynamism" at these sites, i.e. to the intensification of noxious or harmful algal blooms, in the north-west, and of coastal fisheries, in the south-east. (C) 2008 Elsevier Inc. All rights reserved.