Satellite‐based detection and monitoring of phytoplankton blooms along the Oregon coast
Satellite‐based detection and monitoring of phytoplankton blooms along the Oregon coast
复制标题
基于卫星的俄勒冈州海岸浮游植物繁殖监测
DOI：
10.1029/2012jc008114
复制
发表时间：
2012
影响因子：
--
通讯作者：
Angelicque E. White
中科院分区：
文献类型：
--
作者：
S. M. Mckibben;P. Strutton;D. Foley;T. D. Peterson;Angelicque E. White
[1] 我们对 Aqua 航天器上的中分辨率成像光谱辐射计获得的 8 天复合叶绿素-a (CHL) 和荧光线高 (FLH) 图像应用了归一化差分算法，以检测和监测俄勒冈州沿海地区的浮游植物水华。所得的水华产品分别称为 CHLrel 和 FLHrel，将藻华的发生和平流描述为标准 8 天 CHL 或 FLH 图像随时间观察到的相对变化百分比的函数。 Bloom 产品性能经过优化，考虑了生物变异性（天数）和云量的本地时间尺度。 CHLrel 和 FLHrel 检索与 2009 年夏季至 2010 年冬季在俄勒冈州中部海岸采集的原位系泊数据的比较表明，这些产品是检测夏季上升流季节期间水华事件的强大手段。由于持续的云层覆盖和原位叶绿素-a 记录有限，对冬季性能的评估尚无定论。将产品与一致的原位物理代理配对提供了一种工具，可以阐明引发水华爆发的条件并确定影响水华平流、持久性和衰变的物理机制。这些产品为该地区的远程水华检测和监测提供了良好的基础，本文开发的方法适用于具有足够 CHL 和 FLH 覆盖范围的任何地区。
[1] We have applied a normalized difference algorithm to 8 day composite chlorophyll-a (CHL) and fluorescence line height (FLH) imagery obtained from the Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft in order to detect and monitor phytoplankton blooms in the Oregon coastal region. The resulting bloom products, termed CHLrel and FLHrel, respectively, describe the onset and advection of algal blooms as a function of the percent relative change observed in standard 8 day CHL or FLH imagery over time. Bloom product performance was optimized to consider local time scales of biological variability (days) and cloud cover. Comparison of CHLrel and FLHrelretrievals to in situ mooring data collected off the central Oregon coast from summer 2009 through winter 2010 shows that the products are a robust means to detect bloom events during the summer upwelling season. Evaluation of winter performance was inconclusive due to persistent cloud cover and limited in situ chl-a records. Pairing the products with coincident in situ physical proxies provides a tool to elucidate the conditions that induce bloom onset and identify the physical mechanisms that affect bloom advection, persistence, and decay. These products offer an excellent foundation for remote bloom detection and monitoring in this region, and the methods developed herein are applicable to any region with sufficient CHL and FLH coverage.