Variability of sea surface chlorophyll_a concentration in the South Vietnam coastal waters related to enso phenomenon

Vu Van Tac

Abstract


This paper focuses on analyzing the monthly averaged sea surface chlorophyll_a concentration data for 16 years (Jul. 2002 ÷ Sep. 2018), a remote sensing data product of the US National Aeronautics and Space Administration (US NASA), the analyzed results have shown that each occurrence of ENSO phenomenon greatly affects the fluctuation of chlorophyll_a concentration in the South Vietnam‘s coastal waters (SVNC). The monthly averaged chlorophyll_a concentration varies from 0.5 [mg/m3] to 1.1 [mg/m3] (equivalent to 22.4% ÷ 49.3%), while the monthly averaged fluctuation of chlorophyll_a concentration between months is only 0.22 [mg/m3] (equivalent to 9.88%). These fluctuations have a great impact on nutritional resources as well as water quality because chlorophyll_a is a pigment in plankton, which is a criterion to assess the "rich or poor" of nutrition source in seawater. The results of this study are considered as a "small piece" in the overall picture of the impact of ENSO phenomenon on global climate change.


Keywords


The South Vietnam’s coastal waters; Sea surface chlorophyll_a; chlorophyll_a anomaly; MODIS; ENSO

References


Boyer T.P., Antonov J.I., Baranova O.K., Coleman C., Garcia H.E., Grodsky A., Johnson D.R., Locarnini R.A., Mishonov A.V., O'Brien T.D., Paver C.R., Reagan J.R., Seidov D., Smolyar I.V., Zweng M.M., 2013, World Ocean Database 2013. Sydney Levitus, Ed.; Alexey Mishonov, Technical Ed.; NOAA Atlas NESDIS, 72, 209p.

Bui Hong Long, Tran Van Chung, 2017, Preliminary studies on the impact of climate change on the upwelling phenomenon in south central Vietnam waters in summer, Journal of Marine Science and Technology, 17(1), 1–11, Doi: 10.15625/1859-3097/17/1/9716. http://www.vjs.ac.vn/index.php/jmst.

Dewi D.M.P.R., Fatmasari D., Kurniawan A., Munandar M.A., 2018. The impact of ENSO on regional chlorophyll-a anomaly in the Arafura Sea. In IOP Conference Series: Earth and Environmental Science, 139(1), p.012020.

David Eckstein, Vera Künzel, Laura Schäfer L., 2017. Global Climate Risk Index 2018. ISBN978-3-943704-60-0. Available at www.germanwatch.org/de/14638 (16 Nov 2018).

Dham Khalila, Peter M. Atkinsona, Peter Challenorc, 2016. Historical and future trends in seasurface temperature (SST) in the Indo-Pacific region from 1982 to 2100, International Journal of Applied Earth Observation and Geoinformation, 45, 14–26.

Dilley M, N Heyman B., 1995. ENSO and disaster: droughts, floods and El Nino/Southern Oscillation warm events. Disasters., 19, 181–193.

Domeisen D.I.V., Garfinkel C.I., Butler A.H., 2019. Global impacts of ENSO’s reach into the stratosphere, Eos, 100. https://doi.org/10.1029/2019EO115943. Published on 19 February 2019.

Golden Gate Weather Services, Updated thru Nov-Dec-Jan 2018-2019. El Niño and La Niña Years and Intensities: http://ggweather.com/enso/oni.htm.

Kahru M., Di Lorenzo E., Manzano-Sarabia M, Mitchell BG. 2012. Spatial and temporal statistics of sea surface temperature and chlorophyll fronts in the California Current. Journal of Plankton Researchm 34, 749–760.

Kundan Kumar Sagar, 2016. The Mekong River: Tracing the Journey from “Mother of Water” to ‘Arena of Dams and Impending Disasters. Imperial Journal of Interdisciplinary Research (IJIR), Vol-2, Issue-10, 2016 ISSN: 2454-1362, http://www.onlinejournal.in

NASA Goddard Space Flight Center, Ocean Ecology Laboratory, Ocean Biology Processing Group. Moderate-resolution Imaging Spectroradiometer (MODIS) Aqua Chlorophyll Data; 2018 Reprocessing. NASA OB.DAAC, Greenbelt, MD, USA. Doi: 10.5067/AQUA/MODIS/L3B/CHL/2018. Accessed on 02/12/2018.

National Research Council, 1996. Learning to Predict Climate Variations Associated with El Nino and the Southern Oscillation: Accomplishments and Legacies of the TOGA Program. Washington, DC: The National Academies Press. https://doi.org/10.17226/5003.

NOAA.What is upwelling? National Ocean Service website,

https://oceanservice.noaa.gov/facts/upwelling.html, 19/03/19.

Vu T.V., Nguyen H.T., Nguyen T.V., Nguyen H.V., Pham H.T.T., Nguyen L.T., 2015. Effects of ENSO on autumn rainfall in Central Vietnam, Advances in Meteorology, vol. 2015, Article ID 264373, 12 pages, 2015. https://doi.org/10.1155/2015/264373.

The National Aeronautics and Space Administration (NASA) Ocean Color website https://oceancolor.gsfc.nasa.gov/.

Tong Phuoc Hoang Son, Tran Van Chung, Nguyen Huu Huan, Ngo Manh Tien, Vu Van Tac, Nguyen Hoang Thai Khang, Nguyen Truong Thanh Hoi, Marine Herrmann, Eko Siswanto, 2017. Abnormal features of oceanographic characteristics in upwelling Vietnam waters under impact of El Niño events, Vietnam J. of Earth Sciences, 39(3), 225–239, Doi: 10.15625/0866-7187/39/3/10268.

Tran Duc Thanh, 2015. Discussion on coastal zoning in Vietnam, Vietnam Journal of Earth Sciences, 15(1), 1–12. Doi: 10.15625/1859-3097/15/1/4155.

http://www.vjs.ac.vn/index.php/jmst

Vo Van Lanh, Phan Quang, Vu Van Tac, Lau Va Khin, Ngo Manh Tien, Dang Ngoc Thanh, 2000. The oceanographic database of the South China Sea and adjacent waters-Collection of Marine Research Works. Science And Technique Publishing House, 10, 254-259.

Vu Van Tac, Doan Nhu Hai, 2018, Chlorophyll concentration anomaly in Vietnam south central coast related to ENSO phenomenon. Journal of Marine Science and Technology, 18(1), 70–78, Doi: 10.15625/1859-3097/18/1/8786.

http://www.vjs.ac.vn/index.php/jmst.

Liu X., Wang J., Cheng X., Du Y., 2012. Abnormal upwelling and chlorophyll‐a concentration off South Vietnam in summer 2007. Journal of Geophysical Research: Oceans, 117(C7).

Ward P.J., Kummu M., Lall U., 2016. Flood frequencies and durations and their response to El Niño Southern Oscillation: Global analysis. Journal of Hydrology, 539, 358–378. Doi: 10.1016/j.jhydrol.2016.05.045.

WMO 2014 El Niño–Southern Oscillation (Geneva: World Meteorology Organization) pp 2–8. WMO-No. 1145, ISBN 978-92-63-11145-6. Available online: http://library.wmo.int/pmb_ged/wmo_1145_en.pdf.




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