An analysis of diffuse attenuation coefficients for downward irradiance in the KORUS-OC dataset and GOCI data

Title
An analysis of diffuse attenuation coefficients for downward irradiance in the KORUS-OC dataset and GOCI data
Author(s)
이보람; 박영제; 김원국; 안재현; 김상완
KIOST Author(s)
Park, Young Je(박영제)Ahn, Jae Hyun(안재현)
Publication Year
2016-12-13
Abstract
The diffuse attenuation coefficient for downward irradiance (Kd) is an important property for estimation of clarity of ocean, and it is closely related to the in water visibility. The models for estimating the Kd from ocean color imagery can be divided into an empirical (Austin and Petzold, 1981 Mueller and Trees, 1997 Mueller, 2000 Morel, 1988 Morel and Maritorena, 2001) and semianalytic algorithm (Sathyendranath and Platt, 1997 Lee et al., 2005). In this study, the Kd models are evaluated using in situ and GOCI data and modified for accurate GOCI-derived Kd. The in situ data is analyzed firstly using the Korea-US joint field campaign for ocean color research (KORUS-OC) data. The Kd and remote sensing reflectance were measured using the profiler-II, which provides optical measurements of downward irradiances and upwelling radiances. Especially this study focuses on a highly turbid region (i.e. Total suspended matter concentration is over than 100 g/m3), where many existing algorithms tend to underestimate Kd. We also discuss the effect of the Kd accuracy on the GOCI Secchi disk depth which represents optical visibility.n be divided into an empirical (Austin and Petzold, 1981 Mueller and Trees, 1997 Mueller, 2000 Morel, 1988 Morel and Maritorena, 2001) and semianalytic algorithm (Sathyendranath and Platt, 1997 Lee et al., 2005). In this study, the Kd models are evaluated using in situ and GOCI data and modified for accurate GOCI-derived Kd. The in situ data is analyzed firstly using the Korea-US joint field campaign for ocean color research (KORUS-OC) data. The Kd and remote sensing reflectance were measured using the profiler-II, which provides optical measurements of downward irradiances and upwelling radiances. Especially this study focuses on a highly turbid region (i.e. Total suspended matter concentration is over than 100 g/m3), where many existing algorithms tend to underestimate Kd. We also discuss the effect of the Kd accuracy on the GOCI Secchi disk depth which represents optical visibility.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24255
Bibliographic Citation
The 4th Asian/13th Korea-Japan Workshop on Ocean Color (4th AWOC/13th KJWOC), pp.11, 2016
Publisher
Burapha
Type
Conference
Language
English
Publisher
Burapha
Related Researcher
Research Interests

Ocean Color Remote Sensing,Satellite Applications,Ocean color Algorithm,해양원격탐사,위성활용,해색 알고리즘

Files in This Item:
There are no files associated with this item.

qrcode

Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse