US EPA

9641435 

Meetings & Symposia 

Abstract 

Hydrochemical study in open part of the Gulf of Alaska in the winter 2019 

Vazhova, AS 

2019 

English 

The nutrients content in the upper quasi-homogeneous layer is the basis for the formation of the first trophic level. The dissolved oxygen content shows the intensity of photosynthetic processes and characterizes production-degradation processes in the water column. Hydrological and hydrochemical studies were conducted during the international expedition in February-March 2019 in the Gulf of Alaska and DO, DIN, DIP, silicates were determinate at 60 stations on standard horizons. It was revealed that on the surface during the period of research throughout the entire water area, the winter pre-vegetation content of biogenic substances and close to 100% DO was noted, with a slight oversaturation in the southern part of the water area, signaling the beginning of spring bloom. A weak subsurface maximum of dissolved oxygen, which is caused by the heating of water and the release of molecular oxygen from the ocean surface into the atmosphere, has been recorded. Two zones was stand out in the general background of the spatial distribution of hydrochemical parameters. There are the north-west with the influence of the cyclonic gyre of the Sub-arctic current and the south-east where mix of sub-arctic front and coastal flow transforming into Gulf of Alaska waters. 

PICES 2019 Annual Meeting: Connecting Science and Communities in a Changing North Pacific 

Victoria, British Columbia, Canada 

October 16-27, 2019