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- Title
Spatial pattern of K<sub>d</sub>(PAR) and its relationship with light absorption of optically active components in inland waters across China.
- Authors
Zhidan Wen; Kaishan Song; Chong Fang; Qian Yang; Ge Liu; Yingxin Shang; Xiaodi Wang
- Abstract
The spatial distribution of the attenuation of photosynthetic active radiation (Kd(PAR)) was routinely estimated in China lakes and reservoirs. Higher mean value of Kd(PAR) was observed in Northeastern plain and mountainous region (NER). A linear model is used to predict Kd(PAR), as a function of light absorption coefficient of pigment particulates (aphy), colored dissolved organic matters (aCDOM), and inorganic particulate matters (aNAP): Kd(PAR) = 0.41 + 0.57 × aCDOM + 0.96 × aNAP + 0.57 × aphy (R² = 0.87, n = 741, p < 0.001). Spatial Kd(PAR) was relatively dependent on the inorganic particulate matters (average relative contribution of 57.95%). When only consider the contribution of absorption of aOACs to Kd(PAR), the results found that the aOACs could explain 70%-87% of Kd(PAR) variations. In the lakes with low TSM concentration and non-eutrophic lakes with high TSM, aCDOM was the most powerful predicting factor on Kd(PAR). In eutrophic lakes with high TSM, aNAP had the most significant impact on Kd(PAR). This study allowed Kd(PAR) to be predicted from aOACs values in the inland waters. Besides, results of this study are suggesting that new studies on the variability of Kd(PAR) in inland waters must consider the hydrodynamic conditions, trophic status and the distribution of optically active components within the water column.
- Subjects
CHINA; LIGHT absorption; OPTICAL isomers; PARTICULATE matter; HYDRODYNAMICS; LAKES
- Publication
Biogeosciences Discussions, 2018, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2018-348