Retrieval of chlorophyll a concentration from a fluorescence enveloped area using hyperspectral data
Abstract:It is acknowledged that fluorescence line height (FLH) algorithms are still hampered by the uncertainty of fluorescence peak position. The fluorescence peak moves to longer wavelengths with the increase of chlorophyll a concentration. In this article, the fluorescence enveloped area (FEA), which integrates the fluorescence height and the fluorescence peak position, was used to estimate the chlorophyll a concentration in the coastal waters of the Pearl River Estuary. The FEA algorithm was developed from in situ data of chlorophyll a concentration, total suspended matter (TSM) concentration and above-water remote sensing reflectance, which were collected at 37 sampling stations in the Pearl River Estuary during two cruises. The results showed that the FEA algorithm made a better estimation of chlorophyll a concentration compared with the widely used FLH algorithm and moving fluorescence line height (MFLH) algorithm. These three algorithms were applied to the Pearl River Estuary for retrieval of chlorophyll a concentration from Hyperion data acquired on 21 December 2006. Compared with the FLH and the MFLH, the FEA algorithm showed a rational distribution of the chlorophyll a concentration in the Pearl River Estuary.
Document Type: Research Article
Affiliations: 1: Key Laboratory of Tropical Marine Environmental Dynamics (LED), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, PR China 2: Laboratory of Digital Earth Sciences, Center for Earth Observation and Digital Earth, Chinese Academy of Sciences, Beijing, PR China 3: Department of Software Technology,Guangdong Ocean University, Zhanjiang, PR China
Publication date: 2011-07-10