Retrieval of diffuse attenuation coefficient in the China seas from surface reflectance

doi:10.1364/OE.21.015287

IOCAS-IR > 海洋环流与波动重点实验室

	Retrieval of diffuse attenuation coefficient in the China seas from surface reflectance
	Qiu, Zhongfeng 1; Wu, Tingting 2,3; Su, Yuanyuan 1; Qiu, ZF
	2013-07-01
发表期刊	OPTICS EXPRESS
ISSN	1094-4087
卷号	21 期号:13 页码:15287-15297
文章类型	Article
摘要	Accurate estimation of the diffuse attenuation coefficient is important for our understanding the availability of light to underwater communities, which provide critical information for the China seas ecosystem. However, algorithm developments and validations of the diffuse attenuation coefficient in the China seas have been seldom performed before and therefore our knowledge on the quality of retrieval of the diffuse attenuate coefficient is poor. In this paper optical data at 306 sites collected in coastal waters of the China seas between July 2000 and February 2004 are used to evaluate three typical existing K-d(490) models. The in situ K-d(490) varied greatly among different sites from 0.029 m(-1) to 10.3 m(-1), with a mean of 0.92 +/- 1.59 m(-1). Results show that the empirical model and the semi-analytical model significantly underestimate the K-d(490) value, with estimated mean values of 0.24 m(-1) and 0.5 m(-1), respectively. The combined model also shows significant differences when the in situ K-d(490) range from 0.2 m(-1) to 1 m(-1). Thus, the present study proposes that the three algorithms cannot be directly used to appropriately estimate K-d(490) in the turbid coastal waters of the China seas without a fine tuning for regional applications. In this paper, new K-d(490) algorithms are developed based on the semi-analytical retrieval of the absorption coefficient a(m-1) and the backscattering coefficient b(b)(m(-1)) from the reflectance at two wavelengths, 488 and 667 nm for the Moderate Resolution Imaging Spectroradiometer (MODIS) and 490 and 705 nm for the Medium Resolution Imaging Spectrometer (MERIS) applications, respectively. With the new approaches, the mean ratio and the relative percentage difference are 1.05 and 4.6%, respectively, based on an independent in situ data set. Furthermore, the estimates are reliable within a factor of 1.9 (95% confidence interval). Comparisons also show that the K-d(490) derived with the new algorithms are well correlated with the in situ measurements. Our results showed a good improvement in the estimation for K-d(490) using the new approaches, contrasting with existing empirical, semi-analytical and combined models. Therefore, we propose the new approaches for accurate retrieval of K-d(490) in the China seas. (C) 2013 Optical Society of America; Accurate estimation of the diffuse attenuation coefficient is important for our understanding the availability of light to underwater communities, which provide critical information for the China seas ecosystem. However, algorithm developments and validations of the diffuse attenuation coefficient in the China seas have been seldom performed before and therefore our knowledge on the quality of retrieval of the diffuse attenuate coefficient is poor. In this paper optical data at 306 sites collected in coastal waters of the China seas between July 2000 and February 2004 are used to evaluate three typical existing K-d(490) models. The in situ K-d(490) varied greatly among different sites from 0.029 m(-1) to 10.3 m(-1), with a mean of 0.92 +/- 1.59 m(-1). Results show that the empirical model and the semi-analytical model significantly underestimate the K-d(490) value, with estimated mean values of 0.24 m(-1) and 0.5 m(-1), respectively. The combined model also shows significant differences when the in situ K-d(490) range from 0.2 m(-1) to 1 m(-1). Thus, the present study proposes that the three algorithms cannot be directly used to appropriately estimate K-d(490) in the turbid coastal waters of the China seas without a fine tuning for regional applications. In this paper, new K-d(490) algorithms are developed based on the semi-analytical retrieval of the absorption coefficient a(m-1) and the backscattering coefficient b(b)(m(-1)) from the reflectance at two wavelengths, 488 and 667 nm for the Moderate Resolution Imaging Spectroradiometer (MODIS) and 490 and 705 nm for the Medium Resolution Imaging Spectrometer (MERIS) applications, respectively. With the new approaches, the mean ratio and the relative percentage difference are 1.05 and 4.6%, respectively, based on an independent in situ data set. Furthermore, the estimates are reliable within a factor of 1.9 (95% confidence interval). Comparisons also show that the K-d(490) derived with the new algorithms are well correlated with the in situ measurements. Our results showed a good improvement in the estimation for K-d(490) using the new approaches, contrasting with existing empirical, semi-analytical and combined models. Therefore, we propose the new approaches for accurate retrieval of K-d(490) in the China seas. (C) 2013 Optical Society of America
学科领域	Optics
DOI	10.1364/OE.21.015287
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Optics
WOS类目	Optics
WOS记录号	WOS:000321288400037
WOS关键词	OCEAN COLOR ; DOWNWELLING IRRADIANCE ; WATERS ; MODEL ; ABSORPTION ; ALGORITHM
WOS标题词	Science & Technology ; Physical Sciences
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16428
专题	海洋环流与波动重点实验室
通讯作者	Qiu, ZF
作者单位	1.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing, Jiangsu, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Qiu, Zhongfeng,Wu, Tingting,Su, Yuanyuan,et al. Retrieval of diffuse attenuation coefficient in the China seas from surface reflectance[J]. OPTICS EXPRESS,2013,21(13):15287-15297.
APA	Qiu, Zhongfeng,Wu, Tingting,Su, Yuanyuan,&Qiu, ZF.(2013).Retrieval of diffuse attenuation coefficient in the China seas from surface reflectance.OPTICS EXPRESS,21(13),15287-15297.
MLA	Qiu, Zhongfeng,et al."Retrieval of diffuse attenuation coefficient in the China seas from surface reflectance".OPTICS EXPRESS 21.13(2013):15287-15297.

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