Molecular Dynamics and Light Absorption Properties of Atmospheric Dissolved Organic Matter

2021 ◽  
Author(s):  
Hongxing Jiang ◽  
Jun Li ◽  
Rong Sun ◽  
Chongguo Tian ◽  
Jiao Tang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Light Absorption ◽  
Absorption Properties

scholarly journals Optical Properties and Photochemical Production of Hydroxyl Radical and Singlet Oxygen after Ozonation of Dissolved Organic Matter

2021 ◽  
Author(s):  
Frank Leresche ◽  
Jeremy Torres ◽  
Tyler Kurtz ◽  
Urs von Gunten ◽  
Fernando Rosario
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
Hydroxyl Radical ◽  
Singlet Oxygen ◽  
Light Absorption ◽  
Absorption Properties ◽  
Photochemical Production ◽  
Photochemical Properties

This study focuses on the effects of ozonation on the optical and photochemical properties of dissolved organic matter (DOM). Upon ozonation, a decrease in light absorption properties of DOM was...

scholarly journals Parameterization of the light absorption properties of chromophoric dissolved organic matter in the Baltic Sea and Pomeranian lakes

Ocean Science ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 1013-1032 ◽  
Author(s):  
Justyna Meler ◽  
Piotr Kowalczuk ◽  
Mirosława Ostrowska ◽  
Dariusz Ficek ◽  
Monika Zabłocka ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Absorption Coefficient ◽  
Baltic Sea ◽  
Chlorophyll A ◽  
Chromophoric Dissolved Organic Matter ◽  
The Baltic Sea ◽  
Absorption Properties ◽  
Chlorophyll A Concentration ◽  
The Baltic

Abstract. This study presents three alternative models for estimating the absorption properties of chromophoric dissolved organic matter aCDOM(λ). For this analysis we used a database containing 556 absorption spectra measured in 2006–2009 in different regions of the Baltic Sea (open and coastal waters, the Gulf of Gdańsk and the Pomeranian Bay), at river mouths, in the Szczecin Lagoon and also in three lakes in Pomerania (Poland) – Obłęskie, Łebsko and Chotkowskie. The variability range of the chromophoric dissolved organic matter (CDOM) absorption coefficient at 400 nm, aCDOM(400), lay within 0.15–8.85 m−1. The variability in aCDOM(λ) was parameterized with respect to the variability over 3 orders of magnitude in the chlorophyll a concentration Chl a (0.7–119 mg m−3). The chlorophyll a concentration and aCDOM(400) were correlated, and a statistically significant, nonlinear empirical relationship between these parameters was derived (R2 =  0.83). On the basis of the covariance between these parameters, we derived two empirical mathematical models that enabled us to design the CDOM absorption coefficient dynamics in natural waters and reconstruct the complete CDOM absorption spectrum in the UV and visible spectral domains. The input variable in the first model was the chlorophyll a concentration, and in the second one it was aCDOM(400). Both models were fitted to a power function, and a second-order polynomial function was used as the exponent. Regression coefficients for these formulas were determined for wavelengths from 240 to 700 nm at 5 nm intervals. Both approximations reflected the real shape of the absorption spectra with a low level of uncertainty. Comparison of these approximations with other models of light absorption by CDOM demonstrated that our parameterizations were superior (bias from −1.45 to 62 %, RSME from 22 to 220 %) for estimating CDOM absorption in the optically complex waters of the Baltic Sea and Pomeranian lakes.

scholarly journals Characterization of light absorption by chromophoric dissolved organic matter (CDOM) in the upper layer of the Red Sea

2018 ◽  
Vol 133 ◽  
pp. 72-84 ◽  
Author(s):  
Malika Kheireddine ◽  
Mustapha Ouhssain ◽  
Maria Ll. Calleja ◽  
Xosé Anxelu G. Morán ◽  
Y.V.B. Sarma ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Red Sea ◽  
Light Absorption ◽  
Chromophoric Dissolved Organic Matter

Contribution of ferric iron to light absorption by chromophoric dissolved organic matter

2013 ◽  
Vol 58 (2) ◽  
pp. 653-662 ◽  
Author(s):  
Yi-Hua Xiao ◽  
Timo Sara-Aho ◽  
Helinä Hartikainen ◽  
Anssi V. Vähätalo
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Light Absorption ◽  
Ferric Iron ◽  
Chromophoric Dissolved Organic Matter
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