气候变化领域集成服务门户(CCPortal): Secchi Disk Measurements in Turbid Water

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DOI	10.1029/2020JC016172
	Secchi Disk Measurements in Turbid Water
	Bowers D.G.; Roberts E.M.; Hoguane A.M.; Fall K.A.; Massey G.M.; Friedrichs C.T.
发表日期	2020
ISSN	21699275
卷号	125 期号:5
英文摘要	In the classical theory of the Secchi disk depth, diffuse sunlight falling on the disk is reflected back to the observer's eye along the most direct route, as a beam. The disappearance depth, ZSD, of the disk is then expected to vary inversely with the sum of the beam and diffuse attenuation coefficients: c + KD. Observations presented here show that, in the most turbid waters sampled, the Secchi disk is visible at greater depths (by a factor of up to 4) than predicted by this theory. In these conditions, the disk appears blurry, and it seems likely that some of the light reflected by the disk returns to the eye as diffuse light, photons being scattered one or more times on their journey from the disk surface to the observer. We have modified the theory of the Secchi disk in turbid water to allow for a mixture of beamed and diffuse light contributing to disk visibility. The modified theory corrects the under-estimate of Secchi depths in turbid waters and gives good agreement with observations over a wide range of turbidity. The insight gained allows a more informed interpretation of Secchi disk measurements in turbid water. ©2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186870
作者单位	School of Ocean Sciences, Bangor University, Bangor, United Kingdom; Department of Biological Sciences and K.G. Jebsen Centre for Deep Sea Research, University of Bergen, Bergen, Norway; Centre for Marine Research and Technology-CePTMar, Eduardo Mondlane University, Maputo, Mozambique; Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, United States; US Army Engineer Research and Development Center, Vicksburg, MS, United States
推荐引用方式 GB/T 7714	Bowers D.G.,Roberts E.M.,Hoguane A.M.,et al. Secchi Disk Measurements in Turbid Water[J],2020,125(5).
APA	Bowers D.G.,Roberts E.M.,Hoguane A.M.,Fall K.A.,Massey G.M.,&Friedrichs C.T..(2020).Secchi Disk Measurements in Turbid Water.Journal of Geophysical Research: Oceans,125(5).
MLA	Bowers D.G.,et al."Secchi Disk Measurements in Turbid Water".Journal of Geophysical Research: Oceans 125.5(2020).