Science Highlights

Guest Seminar “Ocean Circulation, Ecosystem and Hypoxia around Hong Kong waters (OCEAN_HK)” in HKU

Guest Seminar “Ocean Circulation, Ecosystem and Hypoxia around Hong Kong waters (OCEAN_HK)” organized by School of Biological Sciences, The University of Hong Kong has been held at The University of Hong Kong on 4:00pm, 13 April 2018 (Friday).

Prof. Jianping Gan was invited by Prof. David Baker to deliver a talk in HKU to introduce the current water situation in Hong Kong and the work of Theme Based Research Scheme project “OCEAN_HK”. More than 60 students from related field attended the seminar, keen debate on different controversial issue on Hong Kong marine problem have been discussed.

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Seminar “Modelling Estuarine and Suspended Sediment Transport Dynamics in the Sydney Harbour Estuary” in HKUST

In the first part, Prof. Wang introduced the Flood-ebb and spring-neap variations of turbulent mixing, stratification and estuarine circulation in Sydney Harbor Estuary. After that he introduced the complex bathymetry and lateral circulation in Sydney Harbor Estuary. The asymmetrical circulation structure with a lager velocity during ebb was shown based on the model result and physical dynamics of it was given by Prof Wang.
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Symposium on OCEAN_HK 2018

“Symposium on Ocean Circulation, Ecosystem, HypoxiA and CoNsequences (OCEAN) 2018” was successfully held from 4 March to 6 March at The Hong Kong University of Science and Technology.

This symposium is organized by the OCEAN-HK Theme-based Research Scheme project, and co-organized by HKUST  School of Science, Department of Mathematics, Department of Ocean Science and HKUST Jockey Club Institute for Advanced Study (IAS).

In this year symposium, an ad hoc Assessment and Advisory Committee has been formed and chaired by Prof. Jilan Su (SOA), with committee members: Prof. Dunxin Hu (CAS), Prof. Dake Chen (SOA), Prof. Renhe Zhang (Fudan U) Prof. Don Anderson (WHOI) and Prof. Jim McWilliams (UCLA). The purpose of forming this committee is serve to assess the project progress and give comments and calibrate for the future plan.

This symposium was attended by around 100 scientists, professionals and specialists, from Hong Kong, Mainland China, Taiwan, United States and other countries/ regions and had high-level scientific discussion regarding to ocean circulation, ecosystem and hypoxia in the framework of our OCEAN-HK research project.

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Task 1: Stable N and O isotopes of nitrate in Hong Kong waters

The stable N and O isotopes 15N and δ18O ) of nitrate (NO3) showed a clear spatial gradient around Hong Kong and indicated that significant nitrate assimilation is taking place in the southern waters of Hong Kong.task1_stable-isotopes

Task 4: The observation and simulated temperature and salinity by assimilation experiments and model at July

The observation and simulated temperature and salinity by assimilation experiments and model at July 25, 2015task-42

Task 4: Monthly precipitation and simulated hydrological fluxes

Monthly precipitation and simulated hydrological fluxes at: (a) BL; (b) SJ; (c) GYtask-4

Task 4: Hypoxia zone and velocity

Simulated horizontal distribution of (a) bottom velocity vector and magnitude, depth averaged (b) convergence, (c) ∂u/∂x, and (d) ∂v/∂y of bottom 2 m. The region enclosed by solid black contour lines represent the hypoxia zone (DO < 2 mg L-1). The size of vectors are unified, which means the vector represents the direction only, the magnitude of velocity is shown by color contour in the same figure.task-4

Task 3: Average concentrations of OA, PTX2, GYM-A detected in PRD seawater samples

Average concentrations of OA, PTX2, GYM-A detected in PRD seawater samples

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Task 2: Phytoplankton species observed in the site F805 in Hong Kong Water

Phytoplankton species observed in the site F805 in Hong Kong Water. A-E: Skeletonema spp., F: Chaetoceros decipiens, G: Chaetoceros radicans, H: Chaetoceros tortissimus, I: Chaetoceros debilis, J: Chaetoceros curvisetus, K: Chaetoceros lorenzianus, L: Detonula pumila, M: Dactyliosolen fragilissimus, N: Pseudo-nitzschia sp., O: Pseudo-nitzschia multistriata, P: Pseudo-nitzschia pungens.task-2-1

Task 1: Phosphate, nitrate, nitrite, silicate, TAlk, DIC, DO and pH in surface and bottom waters during leg 1 (before Typhoon Roke)

Phosphate, nitrate, nitrite, silicate, TAlk, DIC, DO and pH in surface and bottom waters during leg 1 (before Typhoon Roke).

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