Estimation of Chlorophyll-a in Northern Coastal Bay of Bengal Using Landsat-8 OLI and Sentinel-2 MSI Sensors

被引：54

作者：

Poddar, Shukla ^{[1
]}

Chacko, Neethu ^{[2
]}

Swain, Debadatta ^{[1
]}

机构：

[1] Indian Inst Technol Bhubaneswar, Sch Earth Ocean & Climate Sci, Bhubaneswar, India

[2] Indian Space Res Org, Reg Remote Sensing Ctr East, Natl Remote Sensing Ctr, Kolkata, India

来源：

FRONTIERS IN MARINE SCIENCE | 2019年 / 6卷

关键词：

chlorophyll-a; ocean color; Landsat-8; Sentinel-2; COMAPS; Bay of Bengal; RETRIEVAL; ALGORITHMS; WATERS; ESTUARY;

D O I：

10.3389/fmars.2019.00598

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Chlorophyll-a can be used as a proxy for phytoplankton and thus is an essential water quality parameter. The presence of phytoplankton in the ocean causes selective absorption of light by chlorophyll-a pigment resulting in change of the ocean color that can be identified by ocean color remote sensing. The accuracy of chlorophyll-a concentration (Chl-a) estimated from remote sensing sensors depends on the bio-optical algorithm used for the retrieval in specific regional waters. In this work, it is attempted to estimate Chl-a from two currently active satellite sensors with relatively good spatial resolutions considering ocean applications. Suitability of two standard bio-optical Ocean Color (OC) Chlorophyll algorithms, OC-2 (2-band) and OC-3 (3-band) in estimating Chl-a for turbid waters of the northern coastal Bay of Bengal is assessed. Validation with in-situ data showed that OC-2 algorithm gives an estimate of Chl-a with a better correlation of 0.795 and least bias of 0.35 mg/m(3). Further, inter-comparison of Chl-a retrieved from the two sensors, Landsat-8 OLI and Sentinel-2 MSI was also carried out. The variability of Chl-a during winter, pre-monsoon, and post-monsoon seasons over the study region were inter-compared. It is observed that during pre-monsoon and post-monsoon seasons, Chl-a from MSI is over estimated compared to OLI. This work is a preliminary step toward estimation of Chl-a in the coastal oceans utilizing available better spatially resolved sensors.

引用

页数：11

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