The Characteristics of Different Apparent Optical Property Parameters in Non-Destructively Estimating Absorptive Substances Within Sea Ice: A Case Study in Liaodong Bay

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Yu Zhang, Zhantang Xu, Yuezhong Yang, Huizeng Liu, Wen Zhou, Cong Liu, Zeming Yang, Cai Li
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Abstract

Absorptive substances (AS) embedded in sea ice can alter irradiance transmission, exerting a significant influence on oceanic biogeochemical processes. Their quantification is thus essential, and a regression model based on the normalized difference index of transmittance (T(λ)) has been widely used for retrieving ice algal biomass. However, the potentials of albedo (α(λ)) and the diffuse attenuation coefficient (Kd(λ)) in AS estimation have not been explored. To fill this gap, sea ice optical properties observed in Liaodong Bay in 2009, 2010, 2013, and 2022 were used to investigate the characteristics of α(λ), T(λ), and Kd(λ) in non-destructively estimating As through sensitivity analyses based on the Hydrolight radiative transfer model. The effects derived from AS vertical distribution, scattering coefficient and ice thickness were studied specifically. Ultimately, a significant relationship between α(λ) and the total absorption coefficient of AS was derived (R2 = 0.79) for Liaodong Bay sea ice. Sensitivity analyses revealed that it could only retrieve AS in the upper 15–20 cm, which was influenced by variations in ice thickness and scattering coefficient. In contrast, T(λ) could retrieve AS throughout the ice column and is less affected by scattering variation; but it is significantly affected by the vertical distribution of AS in the upper layer. Kd(λ) has the best potential in AS estimation, but for sea ice thinner than 30 cm, the effect of variation in ice thickness could not be neglected, similar to T(λ). Knowledge of this is helpful for the future development of AS estimation.

不同表观光学性质参数在非破坏性估算海冰内吸收性物质中的特性:辽东湾案例研究
嵌入海冰中的吸收物质(AS)会改变辐照度透射,对海洋生物地球化学过程产生重大影响。因此,对其进行量化至关重要,基于透射率归一化差异指数(T(λ))的回归模型已被广泛用于检索冰藻生物量。然而,反照率(α(λ))和漫反射衰减系数(Kd(λ))在 AS 估计中的潜力尚未得到探讨。为填补这一空白,利用2009、2010、2013和2022年在辽东湾观测到的海冰光学特性,通过基于Hydrolight辐射传输模型的灵敏度分析,研究了α(λ)、T(λ)和Kd(λ)在无损估算As中的特性。具体研究了 AS 垂直分布、散射系数和冰厚度的影响。结果表明,辽东湾海冰的α(λ)与AS总吸收系数之间存在显著关系(R2=0.79)。灵敏度分析表明,由于受冰厚和散射系数变化的影响,该方法只能获取上部 15-20 厘米的 AS。相比之下,T(λ)可以获取整个冰柱的AS,受散射变化的影响较小,但受上层AS垂直分布的影响较大。Kd(λ) 在估计 AS 方面最有潜力,但对于厚度小于 30 厘米的海冰,冰厚度变化的影响不可忽视,这一点与 T(λ) 类似。了解这一点有助于 AS 估计的未来发展。
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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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