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Time-series MODIS image-based retrieval and distribution analysis of total suspended matter concentrations in Lake Taihu (China).

Zhang Y, Lin S, Liu J, Qian X, Ge Y - Int J Environ Res Public Health (2010)

Bottom Line: TSM in Central Lake and Southern Lakeshore were consistently higher than in other regions, while TSM in East Taihu was generally the lowest among the regions throughout the year.Furthermore, a wide range of TSM concentrations appeared from winter to summer.TSM in winter could be several times that in summer.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.

ABSTRACT
Although there has been considerable effort to use remotely sensed images to provide synoptic maps of total suspended matter (TSM), there are limited studies on universal TSM retrieval models. In this paper, we have developed a TSM retrieval model for Lake Taihu using TSM concentrations measured in situ and a time series of quasi-synchronous MODIS 250 m images from 2005. After simple geometric and atmospheric correction, we found a significant relationship (R = 0.8736, N = 166) between in situ measured TSM concentrations and MODIS band normalization difference of band 3 and band 1. From this, we retrieved TSM concentrations in eight regions of Lake Taihu in 2007 and analyzed the characteristic distribution and variation of TSM. Synoptic maps of model-estimated TSM of 2007 showed clear geographical and seasonal variations. TSM in Central Lake and Southern Lakeshore were consistently higher than in other regions, while TSM in East Taihu was generally the lowest among the regions throughout the year. Furthermore, a wide range of TSM concentrations appeared from winter to summer. TSM in winter could be several times that in summer.

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Catchment area of Taihu Basin.
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f1-ijerph-07-03545: Catchment area of Taihu Basin.

Mentions: Lake Taihu is located in eastern China between 30° 55′ 40″ N and 31° 32′ 58″ N, and 119° 52′ 32″ E and 120° 36′ 10″ E. It is the third largest freshwater lake in China, with a total water area of about 2,338.11 km2. It is a shallow lake, with mean depth 1.9 m, and maximum depth 2.6 m at a water surface elevation of 3.0 m above sea level. The Lake Taihu drainage basin (Figure 1) is the most industrialized area in China with high population density and urbanization. Lake Taihu is important for water supply, flood control, tourism and recreation, shipping and aquaculture. With the increasing pollution from both urban and rural areas surrounding the Lake Taihu Basin over the past two decades, eutrophication and algal blooms (Microcystis spp.) have occurred frequently, which badly affects the function of the lake as a drinking water supply. More efficient water quality monitoring of the lake is urgently needed [13].


Time-series MODIS image-based retrieval and distribution analysis of total suspended matter concentrations in Lake Taihu (China).

Zhang Y, Lin S, Liu J, Qian X, Ge Y - Int J Environ Res Public Health (2010)

Catchment area of Taihu Basin.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC2954563&req=5

f1-ijerph-07-03545: Catchment area of Taihu Basin.
Mentions: Lake Taihu is located in eastern China between 30° 55′ 40″ N and 31° 32′ 58″ N, and 119° 52′ 32″ E and 120° 36′ 10″ E. It is the third largest freshwater lake in China, with a total water area of about 2,338.11 km2. It is a shallow lake, with mean depth 1.9 m, and maximum depth 2.6 m at a water surface elevation of 3.0 m above sea level. The Lake Taihu drainage basin (Figure 1) is the most industrialized area in China with high population density and urbanization. Lake Taihu is important for water supply, flood control, tourism and recreation, shipping and aquaculture. With the increasing pollution from both urban and rural areas surrounding the Lake Taihu Basin over the past two decades, eutrophication and algal blooms (Microcystis spp.) have occurred frequently, which badly affects the function of the lake as a drinking water supply. More efficient water quality monitoring of the lake is urgently needed [13].

Bottom Line: TSM in Central Lake and Southern Lakeshore were consistently higher than in other regions, while TSM in East Taihu was generally the lowest among the regions throughout the year.Furthermore, a wide range of TSM concentrations appeared from winter to summer.TSM in winter could be several times that in summer.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.

ABSTRACT
Although there has been considerable effort to use remotely sensed images to provide synoptic maps of total suspended matter (TSM), there are limited studies on universal TSM retrieval models. In this paper, we have developed a TSM retrieval model for Lake Taihu using TSM concentrations measured in situ and a time series of quasi-synchronous MODIS 250 m images from 2005. After simple geometric and atmospheric correction, we found a significant relationship (R = 0.8736, N = 166) between in situ measured TSM concentrations and MODIS band normalization difference of band 3 and band 1. From this, we retrieved TSM concentrations in eight regions of Lake Taihu in 2007 and analyzed the characteristic distribution and variation of TSM. Synoptic maps of model-estimated TSM of 2007 showed clear geographical and seasonal variations. TSM in Central Lake and Southern Lakeshore were consistently higher than in other regions, while TSM in East Taihu was generally the lowest among the regions throughout the year. Furthermore, a wide range of TSM concentrations appeared from winter to summer. TSM in winter could be several times that in summer.

Show MeSH
Related in: MedlinePlus