期刊
REMOTE SENSING
卷 7, 期 8, 页码 10523-10542出版社
MDPI
DOI: 10.3390/rs70810523
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资金
- State Key Program of National Natural Science of China [41431176]
- National Natural Science Foundation of China [41471287]
- National High Technology Research and Development Program of China [2014AA06A509]
- 135-Program of NIGLAS [NIGLAS2012135014, NIGLAS2012135010]
- Dragon 3 Cooperation Program
As the fifth largest freshwater lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle lake areas show that water quality conditions are deteriorating. This has occurred at the same time as lake management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for lake management.
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