Observation of nitrate deficit along transects across the Canada Basin after major sea-ice loss

• Published in: Polar Science
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2019
• Subjects: N*; Nitrogen loss; Ice retreat; Arctic ocean; Arctic; Arctic Ocean; Canada; Pacific; canada basin; Polar Science; Sea ice
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15937; http://id.nii.ac.jp/1291/00015829/

Nutrient data were collected along similar cross-basin transects in the Canada Basin (75°–85°N) in 2005–2008, to evaluate the long-term change in the nitrate deficit. The results revealed a subsurface N* minimum (<−10 μmol/kg), indicating a large nitrate deficit in the upper halocline water of the basin. The interannual change of N* from 2005 to 2008 demonstrates the increase in the nitrate deficit. The subsurface low-N* waters are expanding, especially in the southern Canada Basin (75°–80°N). The thickening distribution of Pacific water is primarily responsible for the expansion of the nitrate deficit in the basin.