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- Title
Spatial Variations of Subsurface Chlorophyll Maxima During Thermal Stratification in a Large, Deep Subtropical Reservoir.
- Authors
Liu, Miao; Zhang, Yunlin; Shi, Kun; Melack, John; Zhang, Yibo; Zhou, Yongqiang; Zhu, Mengyuan; Zhu, Guangwei; Wu, Zhixu; Liu, Mingliang
- Abstract
Subsurface chlorophyll maxima (SCM) are found in stratified lakes, reservoirs, and oceans. Spatial variations of the SCM magnitude, depth, and thickness during stratification and related factors were examined in a large, deep subtropical reservoir, Lake Qiandaohu. Significant spatial differences in the SCM parameters were found throughout the lake as thermal stratification developed in the late spring of 2014. SCM depth and thickness were positively correlated with euphotic depth and mixed layer depth but negatively correlated with epilimnetic nutrient concentrations. SCM magnitude was negatively correlated with euphotic depth and mixed layer depth and positively correlated with epilimnetic nutrient concentrations. Seasonal variations in SCM differed among subregions of the lake, which were related to seasonal differences in environmental parameters. SCM (averaging 66.2 mg/m2 in spring and 96.4 mg/m2 in summer) accounted for about 82% of the total areal chlorophyll of the water column (Tchl), and the SCM magnitude was better correlated with Tchl than the surface chlorophyll concentration. This study contributes to understanding of factors causing spatial variations in of SCM in the deep subtropical lakes. Plain Language Summary: In deep lakes or reservoirs, maximum chlorophyll concentrations often occur as subsurface chlorophyll maxima (SCM). In this study, a large and deep reservoir in China, Lake Qiandaohu, was selected to investigate the spatial and seasonal variations of the SCM. We used chlorophyll fluorescence profiles from 60 sites distributed across the lake in spring and summer in 2014 to determine SCM magnitude, depth, and thickness and to examine factors related to the variations. Higher water clarity, deeper mixing depth, and less epilimnetic nutrients led to lower SCM magnitude, thicker SCM thickness, and deeper SCM depth. Key Points: Subsurface chlorophyll maxima (SCM) had significant spatial differences in Lake QiandaohuLight, mixing layer depth, and nutrients were related to the spatial pattern of SCMSCM magnitude correlated well with integrated chlorophyll through the water column
- Subjects
QIANDAO Lake (China); CHLOROPHYLL spectra; SPATIAL variation; RESERVOIRS; STRATIGRAPHIC geology
- Publication
Journal of Geophysical Research. Biogeosciences, 2020, Vol 125, Issue 2, p1
- ISSN
2169-8953
- Publication type
Article
- DOI
10.1029/2019JG005480