Temporal and spatial variability of chlorophyll concentrations in the Bering Sea using empirical orthogonal function (EOF) analysis of remote sensing data
Temporal and spatial variability of chlorophyll concentrations in the Bering Sea using empirical orthogonal function (EOF) analysis of remote sensing data
复制标题
DOI：
10.1016/j.dsr2.2007.07.031
复制
发表时间：
2007-01-01
影响因子：
3
通讯作者：
Saitoh, Sei-Ichi
中科院分区：
文献类型：
--
作者：
Iida, Takahiro;Saitoh, Sei-Ichi
利用海景广域视场传感器(SeaWiFS)1998-2002年的观测数据，利用经验正交函数(EOF)分析了白令海表层叶绿素浓度的季节变化和年际变化。对归一化月度场的分析表明，在春季水华期间，白令海东部和西部存在明显不同的时空格局。第一个EOF模式解释了30%的变化，并显示了春季水华期间东部陆架断裂区和西部白令海是如何异相的。第二种EOF模式(17.6%)表明了东部陆架断裂区和堪察加盆地的模式。这个强烈的东西向信号与地面风和光线联系在一起。从特殊传感器微波成像仪(SSM/I)得到的风速异常的EOF模式和来自SeaWiFS的光合作用有效辐射(PAR)显示出类似的偶极子特征，其中东西方向的模式与阿留申低压系统的位置和强度有关。在阿留申低压由西向东转移的年份，较弱的风应力有利于层结的发展，导致白令海西部春季水华强烈。白令海春季叶绿素的变化与大气强迫的变化有很强的联系。(C)2007爱思唯尔有限公司。保留所有权利。
Seasonal and interannual variability of surface chlorophyll concentration in the Bering Sea was examined using Empirical Orthogonal Function (EOF) analysis of data obtained by the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) from 1998 to 2002. The analysis of normalized monthly fields (removing temporal and spatial monthly means) shows that different temporal and spatial patterns are evident in the eastern and western Bering Sea during the spring bloom period. The first EOF mode explains 30% of the variability and shows how the eastern shelf break region and the western Bering Sea are out of phase during the spring bloom. The second EOF mode (17.6%) indicates a pattern involving the eastern shelf break region and the Kamchatka Basin. This strong east-west signal is linked by both surface winds and light. EOF modes of wind-speed anomalies, derived from Special Sensor Microwave Imager (SSM/I), and photosynthetically active radiance (PAR) from SeaWiFS, show a similar dipole feature where the east-west pattern is related to the position and strength of the Aleutian Low pressure system. In years when the Aleutian Low shifts from west to east, weaker wind stress facilitates the development of stratification resulting in a strong spring bloom in the western Bering Sea. The variability of spring chlorophyll has a strong connection with variability in atmospheric forcing in the Bering Sea. (C) 2007 Elsevier Ltd. All rights reserved.