Abstract
Hydroxylamine (NH2OH) is an intermediate of the marine nitrogen cycle and in marine environments dissolved NH2OH is short‐lived. In order to investigate the distribution of NH2OH under varying oxygen conditions, its seasonal variability was investigated on a monthly basis from July 2005 to May 2006 at the time series station Boknis Eck located in the Eckernförde Bay (southwestern Baltic Sea). NH2OH concentrations were generally low and close to the detection limit. However, a pronounced increase was observed after the seasonal thermohaline stratification period with low oxygen/anoxic conditions in the deep layers was terminated in November 2005. The increase of NH2OH was associated with the re‐oxygenation of the water column. We conclude that NH2OH was produced in‐situ during nitrification. We suggest that the detection of significant amounts of NH2OH can be used as an indicator for a “fresh” nitrifying system.
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