Instrument for in situ synchronous measurement of the multi-angle volume scattering function and attenuation coefficient

Author:

Liu Cong1ORCID,Li Cai,Zhao Wei2,Chen Fei,Yang Zeming,Zhang Xianqing,Zhang Yu,Zhou Wen,Cao Wenxi,Yu Linghui,Xing Huanlin

Affiliation:

1. University of Chinese Academy of Sciences

2. Ministry of Natural Resources

Abstract

An instrument named as Volume Scattering and Attenuation Meter (VSAM) is presented. The VSAM can simultaneously measure the attenuation coefficient and the volume scattering function (VSF) from 10° to 170° with an interval of 10° at 659 nm. Using ultrapure water and NCRM-traceable polystyrene microsphere beads, the VSAM was calibrated, and the conversion factor χ for estimating the backscattering coefficient from the backward VSF was obtained based on Mie theory in the laboratory. For χ , the average relative deviation was no more than 7.77% in the range of 100°-160° between the modeled result based on VSAM and the theoretical result by Boss. Subsequently, the VSAM and ECO-VSF3 were deployed in situ in Zhanjiang Bay. The backscattering coefficient and VSF at the same angles measured by the two instruments were quite consistent. Some remarkable changes in the shape and magnitude of the VSF profile at different stations were found, with land-based pollutants composing an important suspicious source of these changes.

Funder

National Natural Science Foundation of China

Scientific and Technological Planning Project of Guangzhou City

State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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