Nutrient maximums related to low oxygen concentrations in the southern Canada Basin

Ming Ming Jin, Jiuxin Shi, Yong Lu, Jianfang Chen, Guoping Gao, Jingfeng Wu, Haisheng Zhang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The phenomenon of nutrient maximums at 70-200 m occurred only in the region of the Canada Basin among the world oceans. The prevailing hypothesis was that the direct injection of the low-temperature high-nutrient brines from the Chukchi Sea shelf (<50 m) in winter provided the nutrient maximums. However, we found that there are five problems in the direct injection process. Formerly Jin et al. considered that the formation of nutrient maximums can be a process of locally long-term regeneration. Here we propose a regeneration-mixture process. Data of temperature, salinity, oxygen and nutrients were collected at three stations in the southern Canada Basin during the summer 1999 cruise. We identified the cores of the surface, near-surface, potential temperature maximum waters and Arctic Bottom Water by the diagrams and vertical profiles of salinity, potential temperature, oxygen and nutrients. The historical 129I data indicated that the surface and near-surface waters were Pacific-origin, but the waters below the potential temperature maximum core depth was Atlantic-origin. Along with the correlation of nutrient maximums and very low oxygen contents in the near-surface water, we hypothesize that, the putative organic matter was decomposed to inorganic nutrients; and the Pacific water was mixed with the Atlantic water in the transition zone. The idea of the regeneration-mixture process agrees with the historical observations of no apparent seasonal changes, the smooth nutrient profiles, the lowest saturation of CaCO3 above 400 m, low rate of CFC-11 ventilation and 3H-3He ages of 8-18 a around the nutrient maximum depths.

Original languageEnglish (US)
Pages (from-to)88-96
Number of pages9
JournalActa Oceanologica Sinica
Volume24
Issue number6
StatePublished - 2005
Externally publishedYes

Fingerprint

Canada
basins
oxygen
nutrient
nutrients
basin
potential temperature
regeneration
temperature
surface water
salinity
Chukchi Sea
injection
water
CFC
shelf sea
bottom water
transition zone
vertical profile
ventilation

Keywords

  • Canada Basin
  • Maximum
  • Mixture
  • Nutrient
  • Regeneration
  • Water mass

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Jin, M. M., Shi, J., Lu, Y., Chen, J., Gao, G., Wu, J., & Zhang, H. (2005). Nutrient maximums related to low oxygen concentrations in the southern Canada Basin. Acta Oceanologica Sinica, 24(6), 88-96.

Nutrient maximums related to low oxygen concentrations in the southern Canada Basin. / Jin, Ming Ming; Shi, Jiuxin; Lu, Yong; Chen, Jianfang; Gao, Guoping; Wu, Jingfeng; Zhang, Haisheng.

In: Acta Oceanologica Sinica, Vol. 24, No. 6, 2005, p. 88-96.

Research output: Contribution to journalArticle

Jin, MM, Shi, J, Lu, Y, Chen, J, Gao, G, Wu, J & Zhang, H 2005, 'Nutrient maximums related to low oxygen concentrations in the southern Canada Basin', Acta Oceanologica Sinica, vol. 24, no. 6, pp. 88-96.
Jin, Ming Ming ; Shi, Jiuxin ; Lu, Yong ; Chen, Jianfang ; Gao, Guoping ; Wu, Jingfeng ; Zhang, Haisheng. / Nutrient maximums related to low oxygen concentrations in the southern Canada Basin. In: Acta Oceanologica Sinica. 2005 ; Vol. 24, No. 6. pp. 88-96.
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