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Correction ARTICLE

Front. Mar. Sci., 03 May 2019 | https://doi.org/10.3389/fmars.2019.00233

Corrigendum: Assessment of Eutrophication Status Based on Sub-Surface Oxygen Conditions in the Gulf of Finland (Baltic Sea)

  • Department of Marine Systems, Tallinn University of Technology, Tallinn, Estonia

A Corrigendum on
Assessment of Eutrophication Status Based on Sub-Surface Oxygen Conditions in the Gulf of Finland (Baltic Sea)

by Stoicescu, S.-T., Lips, U., and Liblik, T. (2019). Front. Mar. Sci. 6:54. doi: 10.3389/fmars.2019.00054

In the original article, there was a mistake in Table 4 as published. In the table, the consumption estimate for reference Stigebrandt and Kalén (2013) was wrong due to a conversion error. Also, other consumption estimates (with the exception of Rahm, 1987) were in ml l−1 month−1 and not in mg l−1 month−1, as they were supposed to be. The corrected Table 4 appears below.

In the original article, there was also another error. In the sentence, “While in the earlier estimates, the monthly consumption rates varied between 0.08 and 0.90 mg l−1 month−1, in the present study, the estimates in the Gulf of Finland were 0.82 mg l−1 month−1 for 2016 and 0.31 mg l−1 month−1 for 2017,” there is a reference to earlier estimates, which were incorrectly presented in Table 4 and in the text and corrected now (see correction table below).

A correction has been made to the Discussion, paragraph 9:

Oxygen consumption results found in this study as averages for the whole period from spring to autumn (June-September) are in the range of other published results (Table 4). While in the earlier estimates, the monthly consumption rates varied between 0.25 and 1.29 mg l−1 month−1, in the present study, the estimates in the Gulf of Finland were 0.82 mg l−1 month−1 for 2016 and 0.31 mg l−1 month−1 for 2017. This comparison is not entirely correct since the earlier estimates were mostly for longer (multi-year) periods and our study dealt only with the productive season, as well as we made our analysis for the intermediate layer (50–60 m) while in the earlier studies deeper (sub-halocline) layers were considered. However, this agreement between different results confirms that the method proposed in our study is applicable to rough consumption estimates. The other question is whether it is accurate enough to be used for eutrophication status assessment. For instance, the negative values of monthly consumption estimates in July of both years indicate that the approach may not be appropriate for shorter periods.

The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.

TABLE 4
www.frontiersin.org

Table 4. Monthly average oxygen consumption results found in the literature.

References

Mattsson, J., and Stigebrandt, A. (1993). The vertical flux of organic matter in the Öresund estimated by two different methods using oxygen measurements. Estuar. Coast. Shelf Sci. 37, 329–342. doi: 10.1006/ecss.1993.1060

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Rahm, L. (1987). Oxygen consumption in the Baltic Proper. Limnol. Oceanogr. 32, 978–978. doi: 10.4319/lo.1987.32.4.0973

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Rydberg, L. (1978). Deep Water Flow and Oxygen Consumption within the Baltic. Report No. 27. Göteborg: Department of Physical Oceanography, Göteborg University.

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Shaffer, G., and Rönner, U. (1984). Denitrification in the Baltic proper deep water. Deep Sea Res. A 31, 197–220. doi: 10.1016/0198-0149(84)90102-X

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Stigebrandt, A., and Kalén, O. (2013). Improving oxygen conditions in the deeper parts of bornholm sea by pumped injection of winter water. Ambio 42, 587–595. doi: 10.1007/s13280-012-0356-4

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Keywords: eutrophication, assessment, hypoxia, Baltic Sea, Gulf of Finland, bottom waters, oxygen

Citation: Stoicescu S-T, Lips U and Liblik T (2019) Corrigendum: Assessment of Eutrophication Status Based on Sub-Surface Oxygen Conditions in the Gulf of Finland (Baltic Sea). Front. Mar. Sci. 6:233. doi: 10.3389/fmars.2019.00233

Received: 08 April 2019; Accepted: 15 April 2019;
Published: 03 May 2019.

Edited and reviewed by: Jacob Carstensen, Aarhus University, Denmark

Copyright © 2019 Stoicescu, Lips and Liblik. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Stella-Theresa Stoicescu, Stella.Stoicescu@taltech.ee