Impacts of Mesoscale Eddies on Biogeochemical Variables in the Northwest Pacific
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sampling Dates and Stations
2.2. Sampling Procedures and Analytical Methods
3. Results
3.1. The Cold and Warm Eddy Characteristics
3.2. Biogeochemical Variables in Different Eddies
3.2.1. Comparisons of Stations
3.2.2. Cold Eddies
3.2.3. Warm Eddies
3.2.4. Comparisons between Cold and Warm Eddies
3.3. Vertical Distribution in Different Eddies
3.3.1. Biogeochemical Variables
3.3.2. Phytoplankton Community
3.4. Relationship between Biological and Physicochemical Factors
3.5. Comparison between Satellite and In Situ Observations
4. Discussion
4.1. Response of Geochemical Variables to Cold and Warm Eddies
4.2. Response of Biological Variables to Cold and Warm Eddies
4.2.1. Response of Chla to Eddies
4.2.2. Response of Phytoplankton to Eddies
4.3. Main Physicochemical Factors Affecting Biological Variables
4.3.1. Nutrient Concentrations
4.3.2. Nutrient Stoichiometry
4.3.3. Photosynthetically Active Radiation
5. Conclusions
- (1)
- Temperature, ammonium, DO, PAR and SPM decreased by 1–35%, while most of the biological variables (Chla, Micro, Pico, Pro, Syn, PEuks) and geochemical variables (salinity, density, DIN, DIP, DSi) increased by 0.2–134% in the CEC compared to the CEO. In contrast, WEC–I and WEC–II showed an increasing percentage of 7–53% in temperature and PAR and a decrease in percentage of 0.2–70% in biological variables (Chla, Micro, Pico, Pro, Syn, PEuks) and other geochemical variables (salinity, DIN, DIP, DSi, DO, SPM) compared to WEO–I and WEO–II. The magnitude of variation between WEC and WEO were not as pronounced as that between CEC and CEO.
- (2)
- The cold and warm eddies were able to force the DCM to rise or drop with pycnocline, nutricline and Zeu as a whole. In particular, cold eddies with a raised thermocline could lead to the DCM uplift by 20 m and enhance phytoplankton biomass when the nutricline and thermocline were coincident. Furthermore, warm eddies drove isopycnals downward, resulting in a 10–25 m drop in DCM and a decrease in nutrient and Chla concentrations at the WEC.
- (3)
- In terms of the depth of the maximum abundance of Micro and Pico, there were significant differences between the center and outside of the eddy, but in terms of the overall vertical structure, both in the cold and warm eddies, Pro and PEuks maintained a unimodal pattern basically consistent with Chla, Syn showed a surface or subsurface maximum type, while multiple types of Micro existed. The alteration of nutricline was usually deepened by downward movement of the warm eddy or was shoaled by upward movement of the cold eddy. The vertical shift of nutricline could enhance or reduce the dominance of Pico by making eutrophic water more oligotrophic or oligotrophic water more eutrophic.
- (4)
- The significant difference in the vertical structure of the phytoplankton community between the center and outside of the eddy might be explained by the direct influence of both nutrient concentrations and stoichiometry. The contribution of Micro to total biomass was much smaller than that of Pico in oligotrophic regions where the DIN:DIP and DSi:DIN ratios were exceedingly low. PAR was not the main factor controlling phytoplankton biomass and abundance in the eddies attributed to Zeu being consistently deeper than Zm, but it might be a key limiting factor affecting the vertical distribution of the phytoplankton community.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Group | CEC vs. CEO | CEC vs. WEC–I | CEC vs. WEC–II | CEO vs. WEO–I | WEC–I vs. WEO–I | WEC–I vs. WEE–I | WEC–I vs. WEC–II | WEO–I vs. WEO–II | WEC–II vs. WEO–II |
---|---|---|---|---|---|---|---|---|---|
Temperature | −10.815 * (0.000) | −6.155 * (0.000) | −13.485 * (0.000) | 14.803 * (0.000) | 6.136 * (0.001) | 2.835 * (0.025) | −3.884 * (0.008) | −3.786 * (0.009) | 12.536 * (0.000) |
Salinity | 0.184 (0.859) | −0.424 (0.685) | −8.230 * (0.000) | −3.344 * (0.016) | −4.279 * (0.005) | −4.661 * (0.002) | −8.419 * (0.000) | −2.716 * (0.035) | −5.692 * (0.001) |
Density | 8.465 * (0.000) | 4.950 * (0.002) | −9.070 * (0.000) | −6.653 * (0.001) | −6.844 * (0.000) | −10.613 * (0.000) | 3.132 * (0.020) | 2.047 (0.087) | −4.894 * (0.002) |
DIN | 4.106 * (0.005) | 4.200 * (0.004) | 3.970 * (0.005) | 1.136 (0.299) | −2.767 * (0.033) | −0.431 (0.679) | −2.801 * (0.031) | −0.506 (0.631) | −4.648 * (0.002) |
DIP | 10.349 * (0.000) | 7.448 * (0.000) | 11.546 * (0.000) | −0.467 (0.657) | −10.392 * (0.000) | 3.976 * (0.005) | 2.322 (0.059) | −2.483 * (0.048) | −11.776 * (0.000) |
DSi | 0.906 (0.395) | 1.814 (0.113) | 4.033 * (0.005) | 1.188 (0.280) | −1.523 (0.179) | −0.158 (0.879) | 1.203 (0.274) | 3.025 * (0.023) | −10.915 * (0.000) |
pH | −1.895 (0.100) | −2.046 (0.080) | −3.908 * (0.006) | −0.509 (0.629) | 0.375 (0.721) | 1.146 (0.289) | −2.293 (0.062) | 0.057 (0.956) | 1.927 (0.095) |
DO | −2.362 * (0.050) | 1.983 (0.088) | 1.730 (0.127) | 0.731 (0.492) | −0.513 (0.627) | −1.249 (0.252) | 1.302 (0.241) | 1.336 (0.230) | 0.158 (0.879) |
SPM | −2.315 (0.054) | −0.768 (0.468) | −1.515 (0.173) | −0.836 (0.435) | −1.152 (0.293) | −0.916 (0.390) | −1.377 (0.218) | −1.910 (0.105) | −0.521 (0.619) |
Chla | 1.098 (0.309) | 1.921 (0.096) | 2.511 * (0.014) | 0.865 (0.420) | −2.912 * (0.027) | −4.692 * (0.002) | 2.953 * (0.025) | 2.277 (0.063) | −0.727 (0.491) |
Micro | 2.469 * (0.043) | 2.978 * (0.021) | 3.077 * (0.018) | −1.143 (0.297) | −1.838 (0.116) | −0.905 (0.396) | 0.121 (0.908) | 1.011 (0.351) | −3.504 * (0.010) |
Pico | 1.003 (0.349) | 2.096 (0.074) | 2.485 * (0.042) | 0.393 (0.708) | −3.292 * (0.017) | −4.923 * (0.002) | 0.873 (0.416) | 2.102 (0.080) | −0.411 (0.694) |
Pro | 0.759 (0.473) | 1.907 (0.098) | 2.404 * (0.047) | 0.256 (0.806) | −3.111 * (0.021) | −4.852 * (0.002) | 1.715 (0.137) | 2.488 (0.470) | −0.201 (0.847) |
Syn | 2.967 * (0.021) | 3.026 * (0.019) | 1.755 (0.123) | 1.343 (0.228) | −3.684 * (0.010) | −11.504 * (0.000) | −3.536 * (0.012) | −3.715 (0.100) | −3.717 * (0.007) |
PEuks | 1.144 (0.290) | 2.034 (0.081) | 2.628 * (0.034) | 2.172 (0.073) | −2.300 (0.061) | −4.361 * (0.003) | 2.644 * (0.038) | 1.758 (0.129) | −0.435 (0.677) |
Variables | Chla | Micro | Pico | Pro | Syn | PEuks |
---|---|---|---|---|---|---|
Temperature | −0.777 * | −0.837 * | −0.780 * | −0.809 * | −0.397 | −0.736 |
Salinity | −0.578 | −0.502 | −0.533 | −0.594 | −0.005 | −0.615 |
Density | 0.672 | 0.683 | 0.625 | 0.687 | 0.090 | 0.617 |
DIN | 0.688 | 0.686 | 0.741 | 0.661 | 0.991 ** | 0.697 |
DIP | 0.694 | 0.766 * | 0.711 | 0.684 | 0.669 | 0.655 |
DSi | 0.924 ** | 0.964 ** | 0.948 ** | 0.955 ** | 0.635 | 0.921 ** |
PAR | −0.792 * | −0.859 * | −0.790 * | −0.850 * | −0.214 | −0.792 * |
Zeu | −0.888 ** | −0.957 ** | −0.918 ** | −0.933 ** | −0.562 | −0.904 ** |
Eddy | Station | DIN | DIP | DSi | DIN:DIP | DSi:DIP | DSi:DIN | Limitation |
---|---|---|---|---|---|---|---|---|
CEC | S1 | 0.79 | 0.15 | 3.04 | 5.40 | 20.70 | 3.84 | DIN |
CEO | S2 | 0.34 | 0.07 | 2.32 | 4.75 | 32.57 | 6.86 | DIN and DIP |
WEO–I | S3 | 0.28 | 0.11 | 2.41 | 2.52 | 21.96 | 8.72 | DIN |
WEC–I | S4 | 0.14 | 0.06 | 1.61 | 2.38 | 27.38 | 11.51 | DIN and DIP |
WEE–I | S5 | 0.20 | 0.08 | 1.73 | 2.65 | 22.44 | 8.47 | DIN and DIP |
WEO–II | S6 | 0.61 | 0.14 | 1.99 | 4.41 | 14.44 | 3.28 | DIN |
WEC–II | S7 | 0.40 | 0.04 | 1.48 | 9.78 | 35.95 | 3.67 | DIN and DIP |
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Kang, J.; Wang, Y.; Huang, S.; Pei, L.; Luo, Z. Impacts of Mesoscale Eddies on Biogeochemical Variables in the Northwest Pacific. J. Mar. Sci. Eng. 2022, 10, 1451. https://doi.org/10.3390/jmse10101451
Kang J, Wang Y, Huang S, Pei L, Luo Z. Impacts of Mesoscale Eddies on Biogeochemical Variables in the Northwest Pacific. Journal of Marine Science and Engineering. 2022; 10(10):1451. https://doi.org/10.3390/jmse10101451
Chicago/Turabian StyleKang, Jianhua, Yu Wang, Shuhong Huang, Lulu Pei, and Zhaohe Luo. 2022. "Impacts of Mesoscale Eddies on Biogeochemical Variables in the Northwest Pacific" Journal of Marine Science and Engineering 10, no. 10: 1451. https://doi.org/10.3390/jmse10101451