Dissolved oxygen, nitrate, nitrite, and ammonum in waters of the Arabian Sea

Distribution of ammonium, nitrite and nitrate nitrogen is examined in a section along 65-67°E between 18°S and 23°N during the transition period from winter to summer monsoons. It is shown that, under conditions of very large oxygen deficit in the 200-400 m layer, denitrification process results in formation of the second deep-sea maximum of nitrites and the intermediate minimum of nitrate nitrogen.

本研究针对沿东经65°-67°、南纬18°至北纬23°的断面，考察了冬夏季风转换期内该海域铵（ammonium）、亚硝酸盐（nitrite）与硝态氮（nitrate nitrogen）的分布特征。研究表明，在200~400米层存在严重氧亏（oxygen deficit）的条件下，反硝化（denitrification）作用促成了亚硝酸盐的第二深海峰值与硝态氮的中层极小值的形成。