Remotely-sensed chlorophyll a observations of the northern Red Sea indicate seasonal variability and influence of coastal reefs
Remotely-sensed chlorophyll a observations of the northern Red Sea indicate seasonal variability and influence of coastal reefs
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DOI：
10.1016/j.jmarsys.2005.12.006
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发表时间：
2008-02-01
影响因子：
2.8
通讯作者：
Kempler, Steven
中科院分区：
文献类型：
--
作者：
Acker, James;Leptoukh, Gregory;Kempler, Steven
开放的北方红海（北纬21.5度至27.5度，东经33.5度至40度）的生物动态尚未得到广泛研究，部分原因是这一沙漠地区交通不便和政治考虑。因此，遥感叶绿素a数据提供了一个框架，调查在这个海洋盆地的生物活动的主要模式。利用戈达德地球科学数据和信息服务中心（GES DISC）在线数据分析系统“Giovanni”分析了为期8年的海洋观测宽视场传感器（SeaWiFS）使命的每月叶绿素a数据和中分辨率成像光谱仪（MODIS）的数据。数据表明，尽管在这些贫营养沃茨中叶绿素a浓度正常较低（0.1-0.2毫克/米（-3）），但在最北部的红海开阔海域（北纬24度至27.5度），在3月至4月期间，伴随着最低海面温度，会出现一种典型的季节性水华。最高叶绿素浓度的位置与线性箱模型一致[Eshel，G.，和新罕布什尔州的奈克，1997.气候沿海急流碰撞，中层水的形成和红海的大气环流。海洋物理学杂志27（7），1233-1257.]红海环流。两年的数据集表现出不同的季节性周期，包括一个相对较弱的北方春季水华和叶绿素浓度升高的南部（21.5度至24度N）。数据还表明，大型珊瑚礁复合体可能是营养物质或富含叶绿素的碎屑和沉积物的来源，提高了邻近珊瑚礁的沃茨的叶绿素a浓度。(c)2007 Elsevier B. V.保留所有权利。
The biological dynamics of the open northern Red Sea (21.5 degrees-27.5 degrees N, 33.5 degrees-40 degrees E) have not been studied extensively, due in part to both the inaccessibility of this desert region and political considerations. Remotely-sensed chlorophyll a data therefore provide a framework to investigate the primary patterns of biological activity in this oceanic basin. Monthly chlorophyll a data from the 8-year Sea-viewing Wide Field-of-View sensor (SeaWiFS) mission, and data from the Moderate Resolution Imaging Spectroradiometer (MODIS), were analyzed with the Goddard Earth Sciences Data and Information Services Center (GES DISC) online data analysis system "Giovanni". The data indicate that despite the normal low chlorophyll a concentrations (0.1-0.2 mg m(-3)) in these oligotrophic waters, there is a characteristic seasonal bloom in March-April in the northernmost open Red Sea (24 degrees to 27.5 degrees N) concurrent with minimum sea surface temperature. The location of the highest chlorophyll concentrations is consistent with a linear box model [Eshel, G., and Naik, N.H., 1997. Climatological coastal jet collision, intermediate water formation, and the general circulation of the Red Sea. J. Phys. Oceanogr. 27(7), 1233-1257.] of Red Sea circulation. Two years in the data set exhibited a different seasonal cycle consisting of a relatively weak northern spring bloom and elevated chlorophyll concentrations to the south (21.5 degrees to 24 degrees N).The data also indicate that large coral reef complexes may be sources of either nutrients or chlorophyll-rich detritus and sediment, enhancing chlorophyll a concentration in waters adjacent to the reefs. (c) 2007 Elsevier B.V. All rights reserved.