Zeng_et_al.2016.pdf (3.31 MB)
Chlorophyll-a estimation around the Antarctica Peninsula using satellite algorithms: hints from field water leaving reflectance
journal contribution
posted on 2023-05-19, 01:25 authored by Zeng, C, Xu, H, Andrew FischerAndrew FischerOcean color remote sensing significantly contributes to our understanding of phytoplankton distribution and abundance and primary productivity in the Southern Ocean (SO). However, the current SO in situ optical database is still insufficient and unevenly distributed. This limits the ability to produce robust and accurate measurements of satellite-based chlorophyll. Based on data collected on cruises around the Antarctica Peninsula (AP) on January 2014 and 2016, this research intends to enhance our knowledge of SO water and atmospheric optical characteristics and address satellite algorithm deficiency of ocean color products. We collected high resolution in situ water leaving reflectance (±1 nm band resolution), simultaneous in situ chlorophyll-a concentrations and satellite (MODIS and VIIRS) water leaving reflectance. Field samples show that clouds have a great impact on the visible green bands and are difficult to detect because NASA protocols apply the NIR band as a cloud contamination threshold. When compared to global case I water, water around the AP has lower water leaving reflectance and a narrower blue-green band ratio, which explains chlorophyll-a underestimation in high chlorophyll-a regions and overestimation in low chlorophyll-a regions. VIIRS shows higher spatial coverage and detection accuracy than MODIS. After coefficient improvement, VIIRS is able to predict chlorophyll a with 53% accuracy.
History
Publication title
SensorsVolume
16Issue
12Article number
2075Number
2075Pagination
1-14ISSN
1424-8220Department/School
Institute for Marine and Antarctic StudiesPublisher
Molecular Diversity Preservation InternationalPlace of publication
Matthaeusstrasse 11, Basel, Switzerland, Ch-4057Rights statement
Copyright 2016 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/Repository Status
- Open