Effects of intrinsic properties and environmental factors on DON photoammonification
Data files
Sep 10, 2026 version files 241.35 KB
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AQY_versus_oxygen.xlsx
10.01 KB
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AQY_versus_salinity.xlsx
9.40 KB
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AQY_versus_stoichiometry.xlsx
9.58 KB
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AQY_versus_temperature.xlsx
10.05 KB
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Metadata.pdf
189.30 KB
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README.md
3.46 KB
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Sampling_Information.xlsx
9.55 KB
Abstract
Photochemical ammonification of dissolved organic nitrogen (DON) is a vital ammonium (NH4⁺) source in sunlit oceans, but its mechanisms and climate sensitivity remains unclear. Here, we experimentally determined the effects of DOM stoichiometry, temperature, salinity, and oxygen on the broadband apparent quantum yield of photoammonification (AQYNH4+) for terrestrial and marine dissolved organic matter (DOM). So, this dataset contains the AQYNH4+ of Suwannee River humic and fulvic acids (SRHA and SRFA), representing terrestrial DOM, versus salinity, AQYNH4+ of SRHA, SRFA, and surface seawater samples collected in the South China Sea and Northwestern Pacific versus temperature, oxygen and N:C mole ratio of DOM were presented.
Dataset DOI: 10.5061/dryad.djh9w0wfq
File: All submitted excel files
Description: We submitted our data to Dryad, containing the broadband apparent quantum yield of DOM photoammonification (AQYNH4+) versus N:C ratio of DOM. salinity, temperature and oxygen. The samples include Suwannee River humic and fulvic acids (SRHA and SRFA), surface seawater collected from the South China Sea shelf and basin and the Northwestern Pacific in summer 2023. SRHA and SRFA represent typical terrestrial DOM, while DOM in seawater samples are mainly marine origin. The photoproduction of ammonium (i.e. photoammonification) experiments were carried out in the land-based laboratory. The AQYNH4+ versus N:C for all the samples, as well as two more data from published reference, AQYNH4+ versus salinity for SRHA and SRFA, AQYNH4+ versus temperature and oxygen for SRHA, SRFA, shelf (S1) and one basin sample (O1) are presented.
Variables:
In file “Sampling_Information.xlsx”: Station ID for column A from row 2 to row 6; Latitude for column B from row 2 to row 6; Longitude for column C from row 2 to row 6; Sampling date for column D from row 2 to row 6; water depth (unit: m) for column E from row 2 to row 6; and sampling depth (unit: m) for column F from row 2 to row 6.
In file “AQY_versus_stoichiometry.xlsx”: Sampling ID for column A from row 2 to row 10; N:C for column B from row 2 to row 10; AQYNH4+ (mol N (mol photons)-1) for column C from row 2 to row 10; sd for column D from row 2 to row 10. sd means one standard deviation, NA in rows 9 and 10 for this column means no data available.
In file “AQY_versus_salinity.xlsx”: Salinity**** for column A from row 2 to row 6; AQYNH4+ of SRHA (mol N (mol photons)-1) and AQYNH4+ of SRFA (mol N (mol photons)-1) for columns B and D from row 2 to row 6, respectively; sd of SRHA and sd~~ of SRFA for columns C and E from row 2 to row 6, respectively. sd means one standard deviation.
In file “AQY_versus_temperature.xlsx”: Temperature (unit: oC) and 1000/T (unit: K-1) for columns A and B from row 2 to row 6, respectively; AQYNH4+ of SRHA (mol N (mol photons)-1), AQYNH4+ of SRFA (mol N (mol photons)-1), AQYNH4+ of S1 (mol N (mol photons)-1) and AQYNH4+ of O1 (mol N (mol photons)-1) for columns C, E, G, and I from row 2 to row 6, respectively; sd~~ of SRHA (mol N (mol photons)-1), sd~~ of SRFA (mol N (mol photons)-1), sd~~ of S1 (mol N (mol photons)-1) and sd~~ of O1 (mol N (mol photons)-1) for columns D, F, H, and J from row 2 to row 6, respectively. sd means one standard deviation.
In file “AQY_versus_oxygen.xlsx”: Sample ID for column 1 from row 2 to row 13; Treatment for column 2 from row 2 to row 13; DO (unit: umol/L) for column 3 from row 2 to row 13; sd of DO for column 4 from row 2 to row 13; AQYNH4+ (mol N (mol photons)-1) for column E from row 2 to row 13; sd of AQYNH4+ for column F from row 2 to row 13. sd means one standard deviation.
File: Metadata.pdf
Description: This file gives the details of the experiments, analysis and quality controlling procedures
Code/software
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Access information
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Data was derived from the following sources:
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