Remote sensing of seawater optical properties and the subsurface phytoplankton layer in coastal waters using an airborne multiwavelength polarimetric ocean lidar

Author:

Yuan Dapeng123ORCID,Mao Zhihua123,Chen Peng23ORCID,He Yan4,Pan Delu123

Affiliation:

1. Shanghai Jiao Tong University

2. Second Institute of Oceanography

3. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)

4. Chinese Academy of Science

Abstract

The vertical profiles of the seawater optical properties and subsurface phytoplankton layer observed during an airborne lidar flight experiment carried out on 29 January 2021 in the coastal waters near Qionghai city were studied. We employed a hybrid inversion model combining the Klett and perturbation retrieval methods to estimate the seawater optical properties, while the vertical subsurface phytoplankton layer profiles were obtained by an adaptive evaluation. The airborne lidar data preprocessing scheme and inversion of the seawater optical properties were described in detail, and the effects of water environment parameters on the airborne lidar detection performance in coastal waters were discussed. The obtained seawater optical properties and phytoplankton layer profiles exhibit characteristic spatiotemporal distributions. The vertical stratification of seawater optical properties along a flight track from 19.19°N to 19.27°N is more pronounced than that from 19.27°N to 19.31°N. The subsurface phytoplankton layer appears along the flight track at water depths of 5–14 m with a thickness of 2–8.3 m. The high concentrations of chlorophyll, colored dissolved organic matter (CDOM), and suspended particulate matter (SPM) in coastal waters are the main factors leading to the shallower detection depth for airborne lidar. A 532 nm laser emission wavelength is more suitable than 486 nm for investigating coastal waters. The 532 nm receiving channel with 25 mrad receiving field of view achieves a better detection performance than that with 6 mrad. These results indicate that lidar technology has great potential for the wide-range and long-term monitoring of coastal waters.

Funder

Southern Marine Science and Engineering Guangdong Laboratory

National Science and Technology Major Project

National Key Research and Development Program of China

Second Institute of Oceanography, State Oceanic Administration

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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