In the South-eastern Pacific, usually concentrations of NO3- are much higher than NH4+ levels in open bays. However, we have detected some seasons with similar and even lower concentrations of NO3-. Which should be the chemical/environmental cause if sampling and quantification protocols have not changed so far? Any help/comment will be very welcomed.
Limnology and Oceanography - LIMNOL OCEANOGR 01/1969; 14(6):912-920. DOI: 10.4319/lo.1969.14.6.0912
The question is ambiguous, but for sure this can help. See the topic of photoinhibition of NO2 oxidation to NO3 in the photic layer, find the article (Kiefer et al....). Nitrification, denitrification, water masses.....plenty topics to think about.
The attached paper contrasts water column DIN (nitrite + nitrate + ammonium) concentrations among replicate ‘natural’ (i.e., healthy), agricultural, urban catchments.
Article Land-to-sea connectivity: Linking human-derived terrestrial ...
if you ask for he limits you may be should visit EPA sites to see the limits and compare it with your measurement
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