Thermal stratification dynamics in a large and deep subtropical reservoir revealed by high-frequency buoy data

Liu, Miao; Zhang, Yunlin; Shi, Kun; Zhu, Guangwei; Wu, Zhixu; Liu, Mingliang; Zhang, Hongjie

doi:10.1016/j.scitotenv.2018.09.215

Cited by 94 publications

(45 citation statements)

References 53 publications

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“…The positive correlation between SCM depth and MLD has been reported in coastal waters (Lu et al, ) and lakes (Leach et al, ). In Lake Qiandaohu, the thermocline began to form in early spring and became stable in midsummer (Liu et al, ), and the average lower boundary of the metalimnion was 22 m in spring and 32 m in summer (Table S1). As a result, the vertical range of the SCM overlapped with the epilimnion and metalimnion, and the location of SCM occurred in the metalimnion in most sites (Tables and S1).…”

Section: Discussionmentioning

confidence: 99%

“…Lake Qiandaohu is a long, narrow reservoir that has many bays and small islands, and the greatest length and width are 150 and 50 km, respectively (Zhang et al, ). The surface water temperature (T w ) ranges from ~11 °C in February to ~33 °C in July, and the lake is stratified from April to November (Liu et al, ). The trophic state has changed since 2000 (Gu et al, ), and its water quality is declining; cyanobacterial blooms have been observed (Li et al, ).…”

Section: Methodsmentioning

confidence: 99%

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Spatial Variations of Subsurface Chlorophyll Maxima During Thermal Stratification in a Large, Deep Subtropical Reservoir

et al. 2020

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Spatial Variations of Subsurface Chlorophyll Maxima During Thermal Stratification in a Large, Deep Subtropical Reservoir

et al. 2020

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“…For profiling, a multi-parameter probe is lowered in the water column to conduct measurements either continuously or stopping at specific heights. Profiling frequency, intermediate profiling steps and the maximal depth can be programmed (Liu et al, 2019;Venkatesan et al, 2019). Due to the generation of frequent profiles at a given station, the changes in water conditions within the day can be recorded over long periods and, therefore, Profiling Buoys can be used to assess biodiversity, eutrophication and hydrographical conditions (Lips et al, 2011).…”

Section: In Situ Research Vessel-independentmentioning

confidence: 99%

A Synthesis of Marine Monitoring Methods With the Potential to Enhance the Status Assessment of the Baltic Sea

et al. 2020

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“…Human activities and economic development are the two main factors that cause excessive enrichment of nutrients. These influencing factors include domestic and industrial sewage, agricultural runoff, gross domestic product (GDP) (primary, secondary, and tertiary industries), over-fertilization of farmland, population growth, and urbanization [16][17][18]. Moreover, aquaculture is one of the increasing sources of nutrient pollution.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

Zhou

Wang

Zhang

et al. 2020

Water

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Nitrogen and phosphorus excessive enrichment are major causes of water eutrophication, and variations in nutrients enrichment are strongly influenced by human activities. In this study, annual average water quality from 2001 to 2018 was used to explore the spatiotemporal variations in total nitrogen (TN) and total phosphorus (TP) and their relationships with human activities. Spatially, TN and TP concentrations exhibited significant variations across the five sub-lake zones, and their values were relatively higher in the NW lake zone than the other sub-lake zones. Temporally, TN concentration exhibited weak correlations with years in the NW (R2 = 0.37, p < 0.05) and NE (R2 = 0.43, p < 0.05) lake zones and significant and positive correlations with years in the SW (R2 = 0.62, p < 0.05), SE (R2 = 0.79, p < 0.05), and C (R2 = 0.84, p < 0.05) lake zones. TP concentration exhibited decreasing trends in all lake zones except the NW lake zone (R2 = 0.37, p < 0.05), its value shows a relatively low level and is the restrictive factor to algal growth. The trophic state of the Lake Qiandaohu was determined as mesotrophic. Gross domestic product (GDP) and construction land exhibited strong correlations with TN and TP. Moreover, agriculture nonpoint source pollution was the largest contributor to the excessive enrichment of TN and TP, resulting in water eutrophication. In addition, aquaculture was another major source of nutrients starting in 1999. Although the managers of Lake Qiandaohu implemented a protection-oriented fishery policy, good results cannot be easily achieved with a unilateral policy concerning environmental protection. Thus, comprehensive policies may be more effective than unilateral policies.

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Thermal stratification dynamics in a large and deep subtropical reservoir revealed by high-frequency buoy data

Cited by 94 publications

References 53 publications

Spatial Variations of Subsurface Chlorophyll Maxima During Thermal Stratification in a Large, Deep Subtropical Reservoir

Spatial Variations of Subsurface Chlorophyll Maxima During Thermal Stratification in a Large, Deep Subtropical Reservoir

A Synthesis of Marine Monitoring Methods With the Potential to Enhance the Status Assessment of the Baltic Sea

Spatiotemporal Variations in Nitrogen and Phosphorus in a Large Man-Made Lake and Their Relationships with Human Activities

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