Remote monitoring of giant kelp biomass and physiological condition: An evaluation of the potential for the Hyperspectral Infrared Imager (HyspIRI) mission
Remote monitoring of giant kelp biomass and physiological condition: An evaluation of the potential for the Hyperspectral Infrared Imager (HyspIRI) mission
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DOI：
10.1016/j.rse.2015.05.003
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发表时间：
2015-09-15
影响因子：
13.5
通讯作者：
Siegel, David A.
中科院分区：
文献类型：
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作者：
Bell, Torn W.;Cavanaugh, Kyle C.;Siegel, David A.
这项研究考察了高光谱红外成像仪(HyspIRI)任务在当地和全球范围内监测巨型海藻森林生物量和生理状况的潜力。巨藻是一种高度活跃的基础物种，支持着全球范围内重要的生态和经济生态系统。卫星、航空和现场数据被用来评估HyspIRI的空间、时间和光谱覆盖范围在捕获巨型海藻生物量和生理状态的变异性方面的适宜性。我们分析了来自陆地卫星图像的28年巨型海藻生物量时间序列，以加州海岸为模式区域，识别巨型海带生物量变化的主要时间模式，该模式可能与全球其他地区相关。加州海带冠层生物量的时间变化与世界上拥有巨大海带种群的地区的预期无云HyspIRI可见光短波红外(VSWIR)视图的可用性进行了比较。通过评估巨型海带冠层生理条件的变化如何在海带叶片的反射和透射率中表现出来，来探索光谱变异性。我们比较了在加利福尼亚州海岸采集的海带叶的叶绿素a与碳的比率(Chl：C)与实验室和航空高光谱反射率的测量结果，以开发海带生理条件的度量标准。季节周期主导着巨型海带冠层生物量的时间变异性。然而，这一周期的强度和时机在空间和时间上都有所不同。我们对无云的HyspIRI覆盖范围的预测表明，该传感器将能够在每个季节捕捉到几乎所有全球巨型海藻栖息地的至少1个无云景观，从而说明HyspIRI将解决巨型海藻生物量的主要季节周期。一个新的光谱指数可以解释Chl：C中76%的变化，并被应用于高光谱飞机观测。这些结果表明，HyspIRI提供的空间、时间和光谱覆盖范围有可能为巨型海带的生态学和生物生理学提供新的见解。(C)2015 Elsevier Inc.保留所有权利。
This study examines the potential of the Hyperspectral Infrared Imager (HyspIRI) mission for monitoring the biomass and physiological condition of giant kelp forests on local to global scales. Giant kelp is a highly dynamic foundation species that supports an ecologically and economically important ecosystem found throughout the globe. Satellite, airborne, and field data are used to evaluate the suitability of HyspIRI's spatial, temporal, and spectral coverage for capturing variability in giant kelp biomass and physiological state. We analyze a 28-year time series of giant kelp biomass derived from Landsat satellite imagery in order to identify the dominant temporal modes of variability in giant kelp biomass using the California coast as a model region likely to be relevant to other regions of the globe. Temporal variability in California kelp canopy biomass is compared to the expected availability of cloud-free HyspIRI Visible Shortwave Infrared (VSWIR) views for regions of the world that contain giant kelp populations. Spectral variability is explored by assessing how changes in the physiological condition of giant kelp canopy are exhibited in the reflectance and transmittance of kelp fronds. We compare chlorophyll a to carbon ratios (Chl:C) of kelp fronds collected off the coast of California to laboratory and airborne measurements of hyperspectral reflectance in order to develop metrics of kelp physiological condition. The seasonal cycle dominates giant kelp canopy biomass temporal variability. However, the strength and timing of this cycle varies in both space and time. Our projections of cloud-free HyspIRI coverage indicate that the sensor will be able to capture at least 1 cloud free view each season for nearly all of the global giant kelp habitats, thereby illustrating that HyspIRI will resolve the dominant seasonal cycles in giant kelp biomass. A novel spectral index developed here from field observations explained 76% of the variance in Chl:C and was applied to hyperspectral aircraft observations. These results demonstrate that the spatial, temporal, and spectral coverage provided by HyspIRI has the potential to provide new insights into the ecology and biophysiology of giant kelp. (C) 2015 Elsevier Inc. All rights reserved.