Volume 39 Issue 3
Apr.  2020
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Sinhalage Udaya Priyantha Jinadasa, Gayan Pathirana, Pradeep Nalaka Ranasinghe, Luca Centurioni, Verena Hormann. Monsoonal impact on circulation pathways in the Indian Ocean[J]. Acta Oceanologica Sinica, 2020, 39(3): 103-112. doi: 10.1007/s13131-020-1557-5
Citation: Sinhalage Udaya Priyantha Jinadasa, Gayan Pathirana, Pradeep Nalaka Ranasinghe, Luca Centurioni, Verena Hormann. Monsoonal impact on circulation pathways in the Indian Ocean[J]. Acta Oceanologica Sinica, 2020, 39(3): 103-112. doi: 10.1007/s13131-020-1557-5

Monsoonal impact on circulation pathways in the Indian Ocean

doi: 10.1007/s13131-020-1557-5
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  • Corresponding author: E-mail: udaya@nara.ac.lk
  • Received Date: 2018-07-30
  • Accepted Date: 2019-01-07
  • Available Online: 2020-04-21
  • Publish Date: 2020-03-25
  • Monsoon driven water mass exchange between the Bay of Bengal (BoB) and Arabian Sea (AS) is the common experience. However, it is not yet firmly confirmed that the exchange pathway is either passing through southern tip of Sri Lanka or Palk Strait. Local circulation patterns impact the pathways followed by the East Indian Coastal Currents (EICC) that drive exchange, thereby modulating mixing and water mass transformation in the Bay of Bengal around Sri Lanka. In this study, observations from surface drifters were incorporated with the satellite derived data to understand the monsoonal impact on circulation patterns in the Indian Ocean. This was the first multi-national scientific effort which was conducted in the BoB and AS during 2013 to 2015 to understand the monsoonal impact on circulation patterns in the complex region. The results indicated that seasonally reversing monsoonal currents of southern Sri Lanka, traced by the wintertime freshwater export pathways of the EICC. The deflection of monsoon currents running along the east coast of Sri Lanka by forming cyclonic and anti-cyclonic eddies, which influence the mixing and stirring associated with these flows. Results further indicate the low salinity cold water flows from the BoB to AS along the western boundary of the BoB during northeast monsoon. In the same way, reverses the phenomena during southwest monsoon, transporting high salinity warm water from AS to the BoB. This maintain the bay status which occurred due to freshwater influx from large rivers and high saline water from AS. However, no evidences were observed for the exchange through Palk Strait during the study. Also, there are some mis-matches in in-situ and remotely sensed measurements which imply the necessity of systematic observation system for the complex region as an alternative approach.
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  • [1]
    Boyer T P, Levitus S, Antonov J I, et al. 2005. Linear trends in salinity for the World Ocean, 1955–1998. Geophysical Research Letters, 32(1): L01604. doi: 10.1029/2004GL021791
    de Vos A, Pattiaratchi C B, Wijeratne E M S. 2014. Surface circulation and upwelling patterns around Sri Lanka. Biogeosciences, 11(20): 5909–5930. doi: 10.5194/bg-11-5909-2014
    Dickey T, Marra J, Sigurdson D E, et al. 1998. Seasonal variability of bio-optical and physical properties in the Arabian sea: October 1994-October 1995. Deep Sea Research Part II: Topical Studies in Oceanography, 45(10–11): 2001–2025
    Glejin J, Kumar V S, Nair T M B. 2013. Monsoon and cyclone induced wave climate over the near shore waters off Puduchery, south western Bay of Bengal. Ocean Engineering, 72: 277–286. doi: 10.1016/j.oceaneng.2013.07.013
    Gopalakrishna V V, Johnson Z, Salgaonkar G, et al. 2005. Observed variability of sea surface salinity and thermal inversions in the Lakshadweep Sea during contrast monsoons. Geophysical Research Letters, 32(18): L18605
    Hacker P, Firing E, Hummon J, et al. 1998. Bay of Bengal currents during the northeast monsoon. Geophysical Research Letters, 25(15): 2769–2772. doi: 10.1029/98GL52115
    Han Weiqing, McCreary J P Jr. 2001. Modeling salinity distributions in the Indian Ocean. Journal of Geophysical Research, 106(C1): 859–877. doi: 10.1029/2000JC000316
    Jensen T G. 2001. Arabian Sea and Bay of Bengal exchange of salt and tracers in an ocean model. Geophysical Research Letters, 28(20): 3967–3970. doi: 10.1029/2001gl013422
    Kumar S P, Narvekar J, Kumar A, et al. 2004. Intrusion of the Bay of Bengal water into the Arabian Sea during winter monsoon and associated chemical and biological response. Geophysical Research Letters, 31(15): L15304. doi: 10.1029/2004GL020247
    Lee C M, Jinadasa S U P, Anutaliya A, et al. 2016. Collaborative observations of boundary currents, water mass variability, and monsoon response in the Southern Bay of Bengal. Oceanography, 29(2): 102–111. doi: 10.5670/oceanog.2016.43
    Lin Chunyi, Ho C R, Lee Y H, et al. 2013. Thermal variability of the Indo-Pacific warm pool. Global and Planetary Change, 100: 234–244. doi: 10.1016/j.gloplacha.2012.10.022
    Lucas A J, Shroyer E L, Wijesekera H W, et al. 2014. Mixing to monsoons: air-sea interactions in the Bay of Bengal. EOS, Transactions American Geophysical Union, 95(30): 269–270
    McPhaden M J, Meyers G, Ando K, et al. 2009. RAMA: the research moored array for African–Asian–Australian monsoon analysis and prediction. Bulletin of the American Meteorological Society, 90(4): 459–480. doi: 10.1175/2008BAMS2608.1
    Potemra J T, Luther M E, O’Brien J J. 1991. The seasonal circulation of the upper ocean in the Bay of Bengal. Journal of Geophysical Research, 96(C7): 12667–12683. doi: 10.1029/91JC01045
    Rao A D, Mahapatra D K, Babu S V, et al. 2012. Spatial-temporal variation and mechanism associated with mini-cold pool off the southern tip of India during summer and winter monsoon season. Water Quality Research Journal, 47(3–4): 333–352. doi: 10.2166/wqrjc.2012.006
    Rao R R, Kumar M S G, Ravichandran M, et al. 2010. Interannual variability of Kelvin wave propagation in the wave guides of the equatorial Indian Ocean, the coastal Bay of Bengal and the southeastern Arabian Sea during 1993–2006. Deep Sea Research Part I: Oceanographic Research Papers, 57(1): 1–13. doi: 10.1016/j.dsr.2009.10.008
    Schott F A, McCreary J P Jr. 2001. The monsoon circulation of the Indian Ocean. Progress in Oceanography, 51(1): 1–123. doi: 10.1016/S0079-6611(01)00083-0
    Schott F, Reppin J, Fischer J, et al. 1994. Currents and transports of the Monsoon Current south of Sri Lanka. Journal of Geophysical Research, 99(C12): 25127–25141. doi: 10.1029/94JC02216
    Sengupta D, Raj G N B, Shenoi S S C. 2006. Surface freshwater from Bay of Bengal runoff and Indonesian Throughflow in the tropical Indian Ocean. Geophysical Research Letters, 33(22): doi: 10.1029/2006GL027573
    Seo H, Xie Shangping, Murtugudde R, et al. 2009. Seasonal effects of Indian Ocean freshwater forcing in a Regional Coupled Model. Journal of Climate, 22(24): 6577–6596. doi: 10.1175/2009JCLI2990.1
    Shankar D, Vinayachandran P N, Unnikrishnan A S. 2002. The monsoon currents in the north Indian Ocean. Progress in Oceanography, 52(1): 63–120. doi: 10.1016/S0079-6611(02)00024-1
    Shenoi S S C. 2010. Intra-seasonal variability of the coastal currents around India: a review of the evidences from new observations. Indian Journal of Geo-Marine Sciences, 39(4): 489–496
    Shetye S R, Gouveia A D, Shenoi S S C, et al. 1991. The coastal current off western India during the northeast monsoon. Deep Sea Research Part A. Oceanographic Research Papers, 38(12): 1517–1529. doi: 10.1016/0198-0149(91)90087-V
    Tomczak M, Godfrey J S. 2003. Regional Oceanography: An Introduction. 2nd ed. Delhi: Daya
    Vinayachandran P N, Chauhan P, Mohan M, et al. 2004. Biological response of the sea around Sri Lanka to summer monsoon. Geophysical Research Letters, 31(1): L01302. doi: 10.1029/2003GL018533
    Vinayachandran P N, Kagimoto T, Masumoto Y, et al. 2005. Bifurcation of the East India coastal current east of Sri Lanka. Geophysical Research Letters, 32(15): L15606. doi: 10.1029/2005GL022864
    Vinayachandran P N, Masumoto Y, Mikawa T, et al. 1999. Intrusion of the southwest monsoon current into the Bay of Bengal. Journal of Geophysical Research, 104(C5): 11077–11085. doi: 10.1029/1999JC900035
    Vinayachandran P N, Shetye S R, Sengupta D, et al. 1996. Forcing mechanisms of the Bay of Bengal circulation. Current Science, 71: 753–763
    Vinayachandran P N, Yamagata T. 1998. Monsoon response of the sea around Sri Lanka: generation of thermal domes and anticyclonic vortices. Journal of Physical Oceanography, 28(10): 1946–1960. doi: 10.1175/1520-0485(1998)028<1946:MROTSA>2.0.CO;2
    Wijesekera H W, Jensen T G, Jarosz E, et al. 2015. Southern Bay of Bengal currents and salinity intrusions during the northeast monsoon. Journal of Geophysical Research, 120(10): 6897–6913. doi: 10.1002/2015jc010744
    Zhang Yuhong, Du Yan. 2012. Seasonal variability of salinity budget and water exchange in the northern Indian Ocean from HYCOM assimilation. Chinese Journal of Oceanology and Limnology, 30(6): 1082–1092. doi: 10.1007/s00343-012-1284-7
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