In situ measurements of physical and biogeochemical variables were conducted along a transect in the Exclusive Economic Zone (EEZ) of Qatar during late summer (September 2014) and winter (January 2015) to investigate their vertical, spatial and temporal variability. The study reveals that the water column is characterized by strong stratification during late summer in the deepest station, where the water depth is around 65 m and the surface to bottom temperature variation is around 9.1°C. The water column is vertically homogeneous during winter due to surface cooling and wind mixing. The surface to 23 m water column is characterized by ample dissolved oxygen (DO) during late summer and winter in the offshore regions, however, relatively low DO is found during late summer due to weak mixing and advection under weak winds and currents. Dissolved oxygen drops to hypoxic levels below the summer thermocline, and the winter high DO layer extends up to the bottom. Chlorophyll-a (Chl-a) is relatively high during late summer in the offshore region, while that in the nearshore regions is very low, which is linked to the anthropogenic stresses from the central east coast of Qatar. The results identified in this study fill an essential gap in the knowledge of regional primary production dynamics.

原位夏季（2014年9月）和冬季（2015年1月）在卡塔尔的专属经济区（EEZ）沿样带进行了物理和生物地球化学变量的测量，以研究其垂直，空间和时间的变异性。研究表明，水柱的特征是在夏末最深的站内有强烈的分层，水深在65 m左右，地表到底部的温度变化在9.1°C左右。由于表面冷却和风混合，冬季的水柱在垂直方向上是均匀的。到23 m水柱的表面特征是在夏季末和冬季在近海区域有足够的溶解氧（DO），但是，由于在弱风和潮流下混合和对流较弱，夏季末发现了相对较低的DO。溶解氧下降到夏季温床以下的低氧水平，而冬季的高溶解氧层一直延伸到底部。叶绿素夏季末期，海上地区的a（Chl- a）相对较高，而近岸地区的a（Chl- a）则很低，这与卡塔尔中部东海岸的人为压力有关。这项研究确定的结果填补了区域初级生产动态知识方面的一个重要空白。