Nutrient dynamics and biological consumption in a large continental shelf system under the influence of both a river plume and coastal upwelling

National Basic Research Program of China (973 Program) [2009CB421204, 2009CB421201]; National Natural Science Foundation of China [90711005, 40821063]; National Natural Science Foundation of China-Research Grants Council Hong Kong Special Administrative Region Government [40731160624N, N_HKUST623/07]; South China Sea Coastal Oceano graphic Process Experiment project