Vertical Chlorophyll-a Concentration Profiles Observed on The Western Coast of Northern Sumatera During the 2017 Northeast Monsoon

Iskhaq Iskandar, Qurnia Wulan Sari, Aan Johan Wahyudi, Afdal, Wijaya Mardiansyah


Subsurface chlorophyll-a (chl-a) concentration variability on Sumatera’s Northwestern coast is part of the phytoplankton biomass that supports and enriches the region’s fisheries supplies. During the 2017 northeast monsoon season from 25th November 25 to 11th December, the Ekspedisi Widya Nusantara (E-WIN) collected data from 16 stations. The finding demonstrates a rise in subsurface chl-a concentration as you get closer to the coast. Furthermore, the deep chl-a maximum (DCM) is only found offshore, with depths−3 between 30 to 50 m and chl-a concentrations of 0.07 to 0.25 mg.m. Surface chl-a concentrations near the coast were found to be high, ranging from 0.2 to 0.25 mg.m-3


Amri, K., A. Priatna, and S. Suprapto (2014). Oceanographic characteristics and abundance of phytoplankton in the waters of the Sunda Strait in the east monsoon. Bawal Widya Riset Perikanan Tangkap, 6(1); 11–20

Chiswell, S. M. (2011). Annual cycles and spring blooms in phytoplankton: don’t abandon Sverdrup completely. Marine Ecology Progress Series, 443; 39–50

Cochlan, W. and J. Hendorn (2012). Water quality methods. Tiburon: Romberg Tiburon Center for Environmental Stud- ies, San Fransisco State University; 317.

Holm-Hansen, O., C. J. Lorenzen, R. W. Holmes, and J. D. Strickland (1965).

Fluorometric determination of chloro- phyll. Journal of Marine Science, 30(1); 3–15

Huot, Y., M. Babin, F. Bruyant, C. Grob, M. Twardowski, and H. Claustre (2007). Does chlorophyll a provide the best index of phytoplankton biomass for primary productivity studies Biogeosciences Discussions, 4(2); 707–745

Iskandar, I., S. Rao, and T. Tozuka (2009). Chlorophyll-a bloom along the southern coasts of Java and Sumatra during2006. International Journal of Remote Sensing, 30(3); 663–671

Lavigne, H., F. D’ortenzio, M. Ribera D’Alcalà, H. Claustre,
R. Sauzède, and M. Gacic (2015). On the vertical distribu- tion of the chlorophyll a concentration in the Mediterranean Sea: a basin-scale and seasonal approach. Biogeosciences, 12(16); 5021–5039

Le, T. T. H., J. Fettig, and G. Meon (2019). Kinetics and simulation of nitrification at various pH values of a polluted river in the tropics. Ecohydrology & Hydrobiology, 19(1); 54–65

Li, W. K., M. R. Lewis, and W. G. Harrison (2010). Multi- scalarity of the nutrient–chlorophyll relationship in coastal phytoplankton. Estuaries and Coasts, 33(2); 440–447

Lutz, V. A., V. Segura, A. I. Dogliotti, D. A. Gagliardini, A. A. Bianchi, and C. F. Balestrini (2010). Primary production in the Argentine Sea during spring estimated by field and satellite models. Journal of Plankton Research, 32(2); 181– 195

Kumar, S. P, M. Nuncio, J. Narvekar, (2004). Are eddies nature’s trigger to enhance biological productivity in the Bay of Bengal Geophysical Research Letters, 31(7); 1-8

Sari, Q. W., P. A. Utari, D. Setiabudidaya, I. Yustian, E. Siswanto, and I. Iskandar (2018). Variability of sur- face chlorophyll-a distributions in the northwestern coast of Sumatra revealed by MODIS. In Journal of Physics: Confer- ence Series, 1080; 012045

Sauzède, R., H. Lavigne., H. Claustre., J. Uitz., C. Schmechtig., F. d’Ortenzio., C. Guinet, and S. Pesant (2015). Vertical dis- tribution of chlorophyll a concentration and phytoplankton community composition from in situ fluorescence profiles: a first database for the global ocean. Earth System Science Data, 7(2); 261–273

Segura, V., V. A. Lutz, A. Dogliotti, R. I. Silva, R. M. Negri, R. Akselman, and H. Benavides (2013). Phytoplankton types and primary production in the Argentine Sea. Marine Ecology Progress Series, 491; 15–31

Siswanto, E., K. Matsumoto, M. C. Honda, T. Fujiki, K. Sasaoka, and T. Saino (2015). Reappraisal of meridional differences of factors controlling phytoplankton biomass and initial increase preceding seasonal bloom in the northwestern Pacific Ocean. Remote Sensing of Environment, 159; 44–56

Siswanto, E., H. Ye, D. Yamazaki, and D. Tang (2017). De- tailed spatiotemporal impacts of El Niño on phytoplankton biomass in the S outh C hina S ea. Journal of Geophysical Research: Oceans, 122(4); 2709–2723

Susanto, R.D., Moore, T.S. and Marra, J (2006). Ocean color variability in the Indonesian Seas during the Sea WiFS era. Geochemistry, Geophysics, Geosystems, 7(5); 1-10

Suzuki, K., N. Handa, H. Kiyosawa, and J. Ishizaka (1995). Distribution of the prochlorophyte Prochlorococcus in the central Pacific Ocean as measured by HPLC. Limnology and Oceanography, 40(5); 983–989

U.S. Environmental Protection Agency (1983). Methods for Chemical Analysis of Water and Wastes. EPA-600/4-79-020:
Zeng, L. and D. Wang (2017). Seasonal variations in the barrier
layer in the South China Sea: characteristics, mechanisms and impact of warming. Climate Dynamics, 48(5-6); 1911– 1930

Zhang, P., J.-L. Xu, J.-B. Zhang, J.-X. Li, Y.-C. Zhang, Y. Li, and X.-Q. Luo (2020). Spatiotemporal Dissolved Silicate Variation, Sources, and Behavior in the Eutrophic Zhanjiang Bay, China. Water, 12(12); 3586

Zhao, C., J. Maerz, R. Hofmeister, R. Röttgers, K. Wirtz, R. Riethmüller, and C. Schrum (2019). Characterizing the vertical distribution of chlorophyll a in the German Bight. Continental Shelf Research, 175; 127–146


Iskhaq Iskandar (Primary Contact)
Qurnia Wulan Sari
Aan Johan Wahyudi
Wijaya Mardiansyah
Iskandar, I., Sari, Q. W., Wahyudi, A. J., Afdal, & Mardiansyah, W. (2022). Vertical Chlorophyll-a Concentration Profiles Observed on The Western Coast of Northern Sumatera During the 2017 Northeast Monsoon. Science and Technology Indonesia, 7(1), 36–40.

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