Observations in the East China Sea inner shelf in 2021 and 2022

Two cruises were conducted to investigate hypoxia in 2020 over the East China Sea inner shelf in August of 2021 (normal year) and 2022 (drought year) respectively. Water samples from surface layer (2m)、bottom layer (2m above the sea floor) and other 0 to 4 mid-layers were collected using a 10 L Rosette hydrophore fitted with a Sea-Bird 917 conductivity-temperature-depth (CTD) recorder. Biogeochemical data (POC, 13C, Chl-a, etc.) were measured using instruments presented in Metadata file.本研究分别于2021年（平水年）与2022年（枯水年）的8月，在东海内陆架海域开展两次航次以调查低氧现象。研究采用搭载Sea-Bird 917型温盐深（conductivity-temperature-depth, CTD）记录仪的10L罗塞特采水器（Rosette hydrophore），采集了表层（2m深度）、底层（距海底2m处）以及其余0至4层中层水体的水样。颗粒有机碳（POC）、碳-13同位素（¹³C）、叶绿素a（Chl-a）等生物地球化学数据的测定，采用元数据文件中列明的仪器完成。