INTRODUCTION

1. Estuarine St. Tetrapod 6/26-7/26) >153 μm (1)TSM (mg/L) 63 μm Biogeochemical analysis (2)POC (mg/L) Sample 10 μm 3 μm (3)Chl-a (μg/L) (Only 0.7 μm) 0.7 μm FATE-KP 宿命 CATNET: Nested filtration device Tidal Influence on Particulate Organic Carbon in the Estuary of a Small Mountainous River Kevin J. Chang, James T. Liu, Jia-jang Hung,and Rick J. YangInstitute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan 80424 INTRODUCTION In this study, we investigated the temporal and spatial distribution of particulate organic carbon (POC) in Gaoping Estuary in southern Taiwan to understand the influence of hydrodynamics and sources on the temporal variation of the particulate organic matter. DATA COLLECTION A 24-h water sampling and hydrodynamic observation was carried out during June 27-28 (a spring tide) and July 5-6 (a neap tide), 2007 in Gaoping Estuary. MATERIAL AND METHODS Sampling station of Gaoping Estuary During spring tide: A 24-h hydrodynamic observation of TSM, Chl-a and POC During neap tide: A 24-h hydrodynamic observation of TSM, Chl-a and POC CONCLUSION The results of different particle grain-size experiment in surface revealed that total particulate matter concentration of very coarse-grained size (represented by >1.53μm) during spring tide had a positive correlation with salinity (Fig. 1). Particles of other four grain sizes in spring tide and overall in neap tide in surface water were negative to salinity (Fig. 1 and 6). In bottom water, overall particle had a good correlation with salinity between spring and neap tides (Fig. 2 and 7). Every parameter in surface and bottom water varies with tidal periods, except TSM of bottom water in spring tide. The regular tidal motion is the major factor to control particle concentration in this estuary (Fig. 2). The results indicate that suspended particles are the carriers of POC. Temporal and spatial variations of POC are consistent with TSM (Fig. 5, 10, 11), for the most part, clay and silt. Chlorophyll-a concentrations were influenced by tide, day light and turbidity (Fig. 3, 4, 8 and 9). Acknowledgment This study was funded by the National Science Council of Taiwan under grant numbers NSC95-2611-M-110-018 and NSC96-2611-M-110-011.