Retrieval of marine inorganic particle concentrations in turbid waters using polarization signals
Retrieval of marine inorganic particle concentrations in turbid waters using polarization signals
复制标题
使用偏振信号反演浑浊水中的海洋无机颗粒浓度
DOI：
10.1080/01431161.2019.1641248
复制
发表时间：
2020-07
影响因子：
3.4
通讯作者：
Pan Delu
中科院分区：
文献类型：
--
作者：
Liu Jia;Liu Jiahang;He Xianqiang;Tian Liqiao;Bai Yan;Chen Tieqiao;Wang Yihao;Zhu Feng;Pan Delu
摘要离水辐射的偏振特性(L W)包含了丰富的水溶胶信息，这对提高海洋成分的反演精度具有很大的潜力。然而，目前的海洋颜色反演算法仅基于离水辐射强度，而忽略了偏振特性。本文在辐射传输模拟的基础上，研究了基于偏振特性提取浑浊水体中悬浮颗粒物的可能性。结果表明，海面下向上辐射的偏振度(DOP)随观测几何形状、无机粒子浓度、太阳天顶角和气溶胶光学厚度(AOTS)的变化具有显著的角度和光谱变化。DOP随观测天顶角的方向变化具有典型的双峰特征，在主平面上最大值为0.5。此外，可见光波段的DOP对无机颗粒浓度高度敏感。DOP从412 nm逐渐减小到555 nm，当波长超过555 nm时，DOP逐渐增大，尤其是大于620 nm时。对于不同的观察几何形状，建立了670 nm的吸光度与无机颗粒浓度之间的经验关系，决定系数(R2)高达0.9996。总的来说，我们的模拟结果表明，水下向上辐射的偏振特性在近岸海域的悬浮颗粒物反演中具有很大的潜力。
ABSTRACT The polarization properties of water-leaving radiance (L w) contains rich information about hydrosols, which has great potential to improve the retrieval accuracy of oceanic constituents. However, current ocean colour inversion algorithms are only based on the water-leaving radiation intensity, and the polarization properties have been ignored. Here, based on the radiative transfer simulations, the possibility of retrieving suspended particulate matter in turbid waters based on the polarization properties was investigated. The results showed that the degree of polarization (DOP) of the upward radiation just beneath the water surface has significant angular and spectral variations with respect to the observational geometries, inorganic particle concentrations, solar zenith angles and aerosol optical thicknesses (AOTs). The directional variations in DOP along with viewing zenith angles are typically characterized by a double peak feature with a maximum of 0.5 in the principal plane. In addition, the DOP in the visible bands is highly sensitive to inorganic particle concentrations. The DOP gradually decreases from 412 nm to 555 nm and increases with wavelengths beyond 555 nm, particularly for wavelengths larger than 620 nm. An empirical relationship between the DOP at 670 nm and the inorganic particle concentration was established for different viewing geometries with determination coefficient (R 2) up to 0.9996. Overall, our simulation results indicate that the polarization property of underwater upward radiance has great potential for suspended particulate matter retrieval in coastal waters.
登录
查看更多内容
影响因子：
2.6
作者：
Hussain J. Nasiha;P. Shanmugam;R. Sundaravadivelu
通讯作者：
Hussain J. Nasiha;P. Shanmugam;R. Sundaravadivelu
影响因子：
3.8
作者：
J. K. Lotsberg;J. Stamnes
通讯作者：
J. K. Lotsberg;J. Stamnes
影响因子：
1.9
作者：
G. Meister;E. Kwiatkowska;B. Franz;F. Patt;G. Feldman;C. McClain
通讯作者：
G. Meister;E. Kwiatkowska;B. Franz;F. Patt;G. Feldman;C. McClain
影响因子：
1.9
作者：
Gilerson, Alexander;Zhou, Jing;Ahmed, Samir
通讯作者：
Ahmed, Samir
影响因子：
5.2
作者：
Breon, FM;Goloub, P
通讯作者：
Goloub, P