CHLOROPHYLL CONCENTRATION ANOMALY IN COASTAL MARINE AREA OF VIETNAM SOUTH CENTRE RELATED TO ENSO PHENOMENON

Vu Van Tac, Doan Nhu Hai
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Authors

  • Vu Van Tac Institute of Oceanography
  • Doan Nhu Hai Institute of Oceanography

DOI:

https://doi.org/10.15625/1859-3097/18/1/8786

Keywords:

Chlorophyll anomaly, coastal marine area of Vietnam South Centre, ENSO.

Abstract

The studies on the impact of the ENSO phenomenon on climate and environment change have shown that the Bien Dong (Southeast Asia Sea) is strongly influenced by this phenomenon. This paper focuses on analyzing sea surface chlorophyll concentration data in the coastal marine area of Vietnam South Centre from MODIS satellite images of National Aeronautics and Space Administration (US NASA). The analysis results have shown that there is no obvious difference of the chlorophyll anomaly index between El Niño and neutral years. However, in La Niña years the chlorophyll anomaly index is greatly varied and generally inversely proportional to the ONI index, which means chlorophyll anomaly index rises while ONI index falls. The impact has made chlorophyll in summer and autumn of La Niña years higher by 0.22 - 0.38 mg/m3 in comparison with other years. In terms of trends, chlorophyll concentration in the Vietnam South Central Coast fluctuates according to the seasons and months. The average chlorophyll concentration usually reaches its maximum value in the Autumn (Sep. - Nov.), then decreases in the Winter (Dec. - Feb.) and usually reaches the minimum value in the Spring (Mar. - May), then rises gradually in the Summer (June - Aug.). The above results have contributed to improving understanding of the impact of the climatic vagaries on the coastal marine area of Vietnam South Centre, supported scientists and managers in proposing measures to prevent, avoid efficiently, limit and mitigate the damage caused by ENSO, and in having reasonable alternatives in the protection of biodiversity as well as environment in the coastal marine area of Vietnam South Centre. It could be considered as a “small piece” of the overall picture of the impacts of the ENSO phenomenon on global climate change.

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References

National Research Council., 1996. Learning to Predict Climate Variations Associated with El Nino and the Southern Oscillation: Accomplishments and Legacies of the TOGA Program. National Academies Press. ISBN: 0309053420- 9780309053426. Pp. 5-7.

Kahru, M., Di Lorenzo, E., Manzano-Sarabia, M., and Mitchell, B. G., 2012. Spatial and temporal statistics of sea surface temperature and chlorophyll fronts in the California Current. Journal of plankton research, 34(9), 749-760.

Liu, X., Wang, J., Cheng, X., and Du, Y., 2012. Abnormal upwelling and chlorophyll-a concentration off South Vietnam in summer 2007. J. Geophys. Res, 117, C07021.

Van Vu, T., Nguyen, H. T., Van Nguyen, T., Van Nguyen, H., Pham, H. T. T., and Nguyen, L. T., 2015. Effects of ENSO on Autumn Rainfall in Central Vietnam. Advances in Meteorology, 2015, 81-92.

Võ Văn Lành, Tống Phước Hoàng Sơn, 2005. Dị thường nhiệt độ, độ mặn và mật độ nước biển vùng Biển Đông. Tạp chí Khoa học và Công nghệ biển, 5(1), 35-50.

Vũ Văn Tác, 2014. Phân bố hàm lượng Chlorophyll trung bình tháng vùng Biển Đông từ 8/2011 đến 7/2012. Tạp chí Khoa học và Công nghệ biển. 14(1), 25-31.

Golden Gate Weather Services, Updated April 13, 2016. El Niño and La Niña Years and Intensities: http://ggweather.com/enso/oni.htm. http://ggweather.com/enso/oni.htm.">

Van Lanh, V., Quang, P., Van Tac, V., Khin, L. V., Tien, N. M., and Thanh, D. N., 2000. The oceanographic database of the South China Sea (Vietnam East Sea) and adjacent waters. Collection of Marine Research Works, 10, 254-259.

Boyer, T. P., Antonov, J. I., Baranova, O. K., Coleman, C., Garcia, H. E., Grodsky, A., ... and Paver, C. R., 2013. World Ocean Database 2013. Sydney Levitus, Ed.; Alexey Mishonov, Technical Ed.; NOAA Atlas NESDIS 72, 209p.

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Published

21-06-2018

How to Cite

Tac, V. V., & Hai, D. N. (2018). CHLOROPHYLL CONCENTRATION ANOMALY IN COASTAL MARINE AREA OF VIETNAM SOUTH CENTRE RELATED TO ENSO PHENOMENON. Vietnam Journal of Marine Science and Technology, 18(1), 70–78. https://doi.org/10.15625/1859-3097/18/1/8786

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