Absorption Property of Non-algal Particles and Contribution to Total Light Absorption in Optically Complex Waters, a Case Study in Yangtze Estuary and Adjacent Coast

2012 ◽  
pp. 61-66 ◽  
Author(s):  
Fang Shen ◽  
Yun-xuan Zhou ◽  
Guan-lin Hong
Keyword(s):  
Light Absorption ◽  
Yangtze Estuary ◽  
Absorption Property ◽  
Total Light

scholarly journals Development of an improved two-sphere integration technique for quantifying black carbon concentrations in the atmosphere and seasonal snow

2020 ◽  
Vol 13 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Xin Wang ◽  
Xueying Zhang ◽  
Wenjing Di
Keyword(s):  
Black Carbon ◽  
Light Absorption ◽  
Optical Method ◽  
Theoretical Calculations ◽  
Dominant Role ◽  
Northern China ◽  
Least Squares Regression ◽  
Seasonal Snow ◽  
Empirical Procedure ◽  
Total Light

Abstract. An improved two-sphere integration (TSI) technique has been developed to quantify black carbon (BC) concentrations in the atmosphere and seasonal snow. The major advantage of this system is that it combines two distinct integrated spheres to reduce the scattering effect due to light-absorbing particles and thus provides accurate determinations of total light absorption from BC collected on Nuclepore filters. The TSI technique can be calibrated using a series of 15 filter samples of standard fullerene soot. This technique quantifies the mass of BC by separating the spectrally resolved total light absorption into BC and non-BC fractions. To assess the accuracy of the improved system, an empirical procedure for measuring BC concentrations with a two-step thermal–optical method is also applied. Laboratory results indicate that the BC concentrations determined using the TSI technique and theoretical calculations are well correlated (R2=0.99), whereas the thermal–optical method underestimates BC concentrations by 35 %–45 % compared to that measured by the TSI technique. Assessments of the two methods for atmospheric and snow samples revealed excellent agreement, with least-squares regression lines with slopes of 1.72 (r2=0.67) and 0.84 (r2=0.93), respectively. However, the TSI technique is more accurate in quantifications of BC concentrations in both the atmosphere and seasonal snow, with an overall lower uncertainty. Using the improved TSI technique, we find that light absorption at a wavelength of 550 nm due to BC plays a dominant role relative to non-BC light absorption in both the atmosphere (62.76 %–91.84 % of total light absorption) and seasonal snow (43.11 %–88.56 %) over northern China.

Film-Depth-Dependent Light Absorption and Charge Transport for Polymer Electronics: A Case Study on Semiconductor/Insulator Blends by Plasma Etching

2016 ◽  
Vol 2 (12) ◽  
pp. 1600359 ◽  
Author(s):  
Laju Bu ◽  
Shuang Gao ◽  
Weichen Wang ◽  
Ling Zhou ◽  
Shi Feng ◽  
...  
Keyword(s):  
Charge Transport ◽  
Plasma Etching ◽  
Light Absorption ◽  
Polymer Electronics

Variations of sediment toxicity in a tidal Estuary: A case study of the South Passage, Changjiang (Yangtze) Estuary

Chemosphere ◽  
2015 ◽  
Vol 128 ◽  
pp. 7-13 ◽  
Author(s):  
Jinjuan Gao ◽  
Huahong Shi ◽  
Zhijun Dai ◽  
Xuefei Mei
Keyword(s):  
Sediment Toxicity ◽  
Yangtze Estuary ◽  
The South ◽  
Tidal Estuary

scholarly journals Quasi-omnidirectional total light absorption in nanostructured gold surfaces

2014 ◽  
Vol 4 (6) ◽  
pp. 1236 ◽  
Author(s):  
Hanbin Zheng ◽  
Renaud Vallée ◽  
Rui M. Almeida ◽  
Thomas Rivera ◽  
Serge Ravaine
Keyword(s):  
Light Absorption ◽  
Gold Surfaces ◽  
Total Light ◽  
Nanostructured Gold

How to maintain the safety level with the increasing capacity of the fairway: A case study of the Yangtze Estuary Deepwater Channel

2020 ◽  
Vol 216 ◽  
pp. 108122
Author(s):  
Nanxi Wang ◽  
Daofang Chang ◽  
Jun Yuan ◽  
Xiaowei Shi ◽  
Xiangen Bai
Keyword(s):  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Safety Level ◽  
Deepwater Channel

Total light absorption in plasmonic nanostructures

2007 ◽  
Vol 9 (9) ◽  
pp. S458-S462 ◽  
Author(s):  
T V Teperik ◽  
V V Popov ◽  
F J García de Abajo
Keyword(s):  
Light Absorption ◽  
Plasmonic Nanostructures ◽  
Total Light

Engineering the Surface Structure of MoS2 Nanosheets by Carbon-Doping with Rich Defects to Tune UV-Visible Light Absorption Property

2017 ◽  
Vol 735 ◽  
pp. 185-188 ◽  
Author(s):  
Zhen Yin Hai ◽  
Jian Gong Du ◽  
Chen Yang Xue ◽  
Dan Feng Cui ◽  
Mohammad Karbalaei Akbari ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Photo Luminescence ◽  
Optical Bandgap ◽  
Carbon Doping ◽  
Absorption Property ◽  
Visible Light Absorption ◽  
Carbon Doped ◽  
Uv Visible ◽  
Light Absorption Property

A facile doping method utilizing inexpensive raw materials was proposed to achieve variation in optical bandgap and UV-visible light absorption property of MoS2 nanosheets. Carbon-assistant heating with degreasing cotton has demonstrated the development of carbon-doped MoS2 nanosheets with enhanced rich defects. The results obtained shown that modified MoS2 nanosheets with the lateral width of ~600 nm are exhibited shift of the intensively blue peaks of photo-luminescence (PL) comparing to those MoS2 nanosheets with a lateral dimension of larger than 1 μm. Optical bandgap of the carbon-doped MoS2 nanosheets was found to be broader than that of the pure MoS2 nanosheets and the prepared samples also exhibited a broadband UV-visible light absorption property.

scholarly journals Vertical Distribution of Bio-Optical Properties of the Azov – Black Sea Basin Waters in April – May, 2019

2020 ◽  
Vol 27 (5) ◽  
Author(s):  
T. V. Efimova ◽  
T. Ya. Churilova ◽  
E. Yu. Skorokhod ◽  
N. A. Moiseeva ◽  
E. A. Zemlianskaia ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Light Absorption ◽  
Euphotic Zone ◽  
Optically Active ◽  
Colored Dissolved Organic Matter ◽  
Active Components ◽  
Absorption Coefficients ◽  
Chlorophyll A Concentration ◽  
Water Region ◽  
Total Light

Purpose. The work is aimed at investigating spatial distribution of the chlorophyll a concentration and the spectral light absorption coefficients by all optically active components in the Azov and Black seas in spring, when the seawater hydrophysical structure changes. Methods and Results. The data collected in the 106th scientific cruise of R/V Professor Vodyanitsky in April 19 – May 10, 2019 were used. The chlorophyll a concentration was measured by the spectrophotometric method. The spectral light absorption coefficients were determined in accordance with the NASA protocol 2018. The optical measurements were performed using the dual-beam spectrophotometer Lambda 35 (PerkinElmer). It was shown that in the surface layer of the Black Sea, the chlorophyll a concentration varied from 0.21 to 1.2 mg/m3. At some stations in the deep-water region, the increased values of this parameter were observed in the lower part of the euphotic zone that was associated with the beginning of seasonal water stratification due to the surface water heating. At these stations, the phytoplankton absorption spectra were more smoothed in the lower part of the euphotic zone than those in the upper layer. In the deep-water region, the non-algal particles contribution to the total particulate light absorption at wavelength 438 nm changed with depth from 40 ± 15 % at the surface to 29 ± 12 % near the bottom of the euphotic zone; whereas in the coastal waters this parameter was almost unchangeable within the water column (54 ± 11 %). No significant change of the colored dissolved organic matter contribution to the total light absorption with depth was revealed (69% on average). In the Sea of Azov, vertical distribution both of the chlorophyll a concentration (6.2 mg/m3 on average) and the spectral light absorption coefficients by all the optically active components was uniform. The non-algal particles contribution to the particulate light absorption was 40 ± 14 %, and the colored dissolved organic matter contribution to the total light absorption constituted 52 ± 6 %. Conclusions. New data on spatial distribution of the chlorophyll a concentration and the spectral light absorption coefficients by the optically active components in the Black and Azov seas were obtained for the spring period when the seawater hydrophysical characteristics changed.

Sign in / Sign up

Export Citation Format

Share Document