UROP Proceedings 2020-21

School of Science Department of Ocean Science 62 Department of Ocean Science Phytoplankton Biomass and Community Composition in Hong Kong Coastal Waters Supervisor: LIU Hongbin / OCES Student: LI Hau Ki / OST Course: UROP1000, Summer Microzooplankton is important for the marine ecosystem, and it includes many groups of organisms such as ciliate and dinoflagellates. Different locations in the Bering Sea have different conditions, such as chlorophyll concentration. So, the abundance and biomass of microzooplankton may vary in different locations respectively. To study the abundance and biomass, samples were collected from different stations in the Bering Sea and examined by using a microscope. Moreover, the abundance and biomass of microzooplankton among different locations in the Bering Sea will be compared. This report concluded that the abundance and biomass are the highest in Anadyr Bay, which is at the northwest Bering Sea. Study on the Adaptation and Physiological Responses of Synechococcus Isolates from Different Oceans Supervisor: LIU Hongbin / OCES Student: IO Kai Hong / ENVS LAM Chung Ling / ENVS Course: UROP4100, Fall UROP1100, Fall Synechococcus as the second most abundant oxygenic phototroph in the ocean are known to exploit a wide range of light niches. This arises from the high diversity of pigments among Synechococcus. While different light environments can accommodate strains of various pigment types (PTs) of Synechococcus with different pigment compositions, some strains are found to be capable of Type IV chromatic acclimation (CA4), where the content of their phycobilosomes changes according tot the ambient light quality. Different strains of Synechococcus growing in white and blue light were studied to investigate the process of chromatic adaptation in Synchococcus. It is found that the pigment composition of Synechoccous changes with the light quality, and some features of possibly strains that can perform CA4 are spotted. The study provides insights of one of the important adaptations of Synechococcus, light acclimation, and studying on the process and characteristics of light adaptation helps understand the distribution and ecology of Synechococcus. Ising Model as a Model for Ice Melt Ponds Supervisor: MAK Julian / OCES Student: LEUNG Hoi Yan Anastasia / PHYS Course: UROP1000, Summer Efforts have been made to understand the formation of ice ponds in the Arctic Sea, to attempt to slow down the melting of ice. There have been postulations that the ice pond formation has similarities to the Ising model. This project simulates the Ising model by Monte Carlo simulation, using MetropolisHastings algorithm and Glauber Dynamics. The change of energy, magnetisation, specific heat, and magnetic susceptibility, with temperature at different magnitude of external field is also computed. The critical temperature of magnets is seen to increase with increasing external magnetic field. This study also attempts to recreate ice pond formations using the Ising model.

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