the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
New insights into mechanisms of sunlight-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters
Yijun Liu
Jie Yuan
Fu-Jun Yue
Si-Liang Li
Baoli Wang
Mohammad Mohinuzzaman
Xuemei Yang
Nicola Senesi
Xinyu Lao
Longlong Li
Cong-Qiang Liu
Rob M. Ellam
Khan M. G. Mostofa
Abstract. The production of fluorescent dissolved organic matter (FDOM) produced from phytoplankton and its subsequent degradation both of which occur constantly under diurnal-day time sunlight and by night time dark-microbial processes, influence markedly several biogeochemical processes and functions in aquatic environments and can be feasibly related to global warming (GW). In this work sunlight-mediated high-temperature was shown to accelerate the production of FDOM, but also its complete disappearance over a 24-h diurnal period in July, but not in lower temperature months. In July, extracellular polymeric substances (EPS), an early-state DOM, were produced from phytoplankton in early morning (06:00–09:00), then were degraded into four FDOM components over midday (10:00–15:00), which was followed by simultaneous production and almost complete degradation of FDOM with reformation of EPS during night time (02:00–06:00). Such transformations occurred simultaneously with the fluctuating production of nutrients (NH4+, NO3−, NO2−, PO43− and dissolved Si), dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and the two isotopes (δ15N and δ18O) of NO3−. The FDOM components identified by fluorescence excitation-emission matrix (EEM) spectroscopy combined with parallel factor (PARAFAC) analysis consisted of EPS, autochthonous humic-like substances (AHLS) of C and M types distinctly, a combined form of C and M types of AHLS, protein-like substances (PLS), newly-released PLS, tryptophan-like substances (TLS), tyrosine-like substances (TYLS), a combined form of TYLS and phenylalanine-like substances (PALS), as well as their degradation products. Finally, stepwise degradation and production processes are synthesized in a pathway for FDOM components production and their subsequent transformation under different diurnal temperature conditions, which provided a broader paradigm for future impacts on GW-mediated DOM dynamics in lake water.
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Yijun Liu et al.


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RC1: 'comments', Anonymous Referee #1, 02 Jun 2020
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AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
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AC2: 'Responses for Reviewer#1', Khan M. G. Mostofa, 03 Jul 2020
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AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
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RC2: 'Comments on"New insights into mechanisms of sunlight-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters"', Anonymous Referee #2, 02 Jun 2020
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AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
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AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020


-
RC1: 'comments', Anonymous Referee #1, 02 Jun 2020
-
AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
-
AC2: 'Responses for Reviewer#1', Khan M. G. Mostofa, 03 Jul 2020
-
AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
-
RC2: 'Comments on"New insights into mechanisms of sunlight-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters"', Anonymous Referee #2, 02 Jun 2020
-
AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
-
AC1: 'Responses for Reviewer#2', Khan M. G. Mostofa, 19 Jun 2020
Yijun Liu et al.
Yijun Liu et al.
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