气候变化领域集成服务门户(CCPortal): Inherent Optical Properties-Reflectance Relationships Revisited

CCPortal

DOI	10.1029/2020JC016661
	Inherent Optical Properties-Reflectance Relationships Revisited
	Lo Prejato M.; McKee D.; Mitchell C.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	Understanding the relationship between remote sensing reflectance, Rrs(λ) and the inherent optical properties (IOPs) of natural waters is potentially a key to improving our ability to determine biogeochemical constituents from radiometric measurements. These relationships are usually described as a function of absorption, a(λ), and backscattering, bb(λ), coefficients, with the literature providing various forms of equation operating on either bb(λ)/a(λ) or bb(λ)/[a(λ)+bb(λ)] to represent the impact of variations in light field geometries and changes in sea-water composition. The performance of several IOP-reflectance relationships is assessed using HydroLight radiative transfer simulations covering a broad range of Case 1 and Case 2 water conditions. While early versions of IOP-reflectance relationships assigned variability to associated proportionality factors (e.g., f/Q) or low-order polynomial functions, recent studies have demonstrated relationships between Rrs(λ) and bb(λ)/[a(λ)+bb(λ)] are well-characterized by nonlinear (high-order polynomial), monotonic functions. This study demonstrates that this approach is also valid for relationships operating on bb(λ)/a(λ) and that there is no intrinsic benefit to functions operating on bb(λ)/[a(λ)+bb(λ)] compared to bb(λ)/a(λ) for Case 2 waters, contrary to recent suggestions in the literature. In all cases it is necessary to carefully consider the performance of best fit relationships across the full range of variability of IOPs and Rrs(λ), with higher order polynomials required to enable equivalent performance across the range of natural variability. The analysis further demonstrates insignificant wavelength sensitivity across the visible region, limited sensitivity to changes in solar zenith angle and extends to relationships for below surface remote sensing reflectance, rrs(λ). © 2020 The Authors.
英文关键词	inherent optical properties; marine optics; ocean colour; reflectance; remote sensing
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/186584
作者单位	Physics Department, University of Strathclyde, Glasgow, United Kingdom; Department Arctic and Marine Biology, Faculty for Bioscience, Fisheries and Economy, UiT The Arctic University of Norway, Tromsø, Norway; Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, United States
推荐引用方式 GB/T 7714	Lo Prejato M.,McKee D.,Mitchell C.. Inherent Optical Properties-Reflectance Relationships Revisited[J],2020,125(11).
APA	Lo Prejato M.,McKee D.,&Mitchell C..(2020).Inherent Optical Properties-Reflectance Relationships Revisited.Journal of Geophysical Research: Oceans,125(11).
MLA	Lo Prejato M.,et al."Inherent Optical Properties-Reflectance Relationships Revisited".Journal of Geophysical Research: Oceans 125.11(2020).