Temporal variations of hydrology and light transmission at two fixed observation stations in the East China Sea

The temporal variations of the hydrology and light transmission at two fixed position observation stations in the East China Sea (ECS) during February to March 1997 were analyzed. The fixed position observations were conducted at 29°28'N, 124°45'E (Station 409), the center of the PN section, and at 32°N, 126°E (Station 111), the center of the ECS Cold Eddy. The results indicate: the semidiurnal tide generated semidiurnal variations of temperature, salinity and light transmission due to horizontal advection, but the resuspension effect of the semidiurnal tide still need to be analyzed; the sea surface diurnal temperature range was as large as 0.2°C during low wind period; the resuspension due to wind disturbance at the two stations (with water depth of more than 80 m) seemed to be small; from late February to early March, the near bottom water temperature as well as light transmission at Station 111 sharply decreased. Contribution No. 3868 from the Institute of Oceanology, Chinese Academy of Sciences. Project 49636210 supported by NSFC.