The Origin of Blue-Green Window and the Propagation of Radiation in Ocean Waters

  • A. T. Reghunath Indian Institute of Science, Bangalore
  • V. Venkataramanan Indian Institute of Science, Bangalore
  • D. Victor Suviseshamuthu Indian Institute of Science, Bangalore
  • R. Krishnamohan Indian Institute of Science, Bangalore.
  • B. Raghavendra Prasad Indian Institute of Science, Bangalore
  • S. Raghuveer Indian Institute of Science, Bangalore
  • C. K. Subramanian Indian Institute of Science, Bangalore
  • P. Chandrasekhar Indian Institute of Science, Bangalore
  • P. S. Narayana Indian Institute of Science, Bangalore
  • M. Ravishamkar Cochin University of Science and Technology, Cochin
  • V.P.N. Nampoori Cochin University of Science and Technology, Cochin
  • K. Sathianandan Cochin University of Science and Technology, Cochin
DOI: https://doi.org/10.14429/dsj.41.4401
Keywords: Attenuation spectrum, Beam attenuation coefficient

Abstract

A review of the present knowledge about the origin of blue-green window in the attenuation spectrum of ocean waters is presented. The various physical mechanisms which contribute to the formation of the w-indow are dealt separately and discussed. The typical values of attenuation coefficient arising out of the various processes are compiled to obtain the total beam attenuation coefficient. These values are then compared with measured values of attenuation coefficient for ocean waters collected from Arabian sea and Bay of Bengal. The region of minimum attenuation in pure particle-free sea water is found to be at 450 to 500 nm. It is sbown that in the presence of suspended 'particles
and chlorophyll, the window shifts to longer wavelength side. Some suggestions for future work in this area are also given in the concluding section.

Author Biographies

A. T. Reghunath, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
V. Venkataramanan, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
D. Victor Suviseshamuthu, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
R. Krishnamohan, Indian Institute of Science, Bangalore.
Department of Physics, Indian Institute of Science, Bangalore
B. Raghavendra Prasad, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
S. Raghuveer, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
C. K. Subramanian, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
P. Chandrasekhar, Indian Institute of Science, Bangalore
Department of Physics, Indian Institute of Science, Bangalore
M. Ravishamkar, Cochin University of Science and Technology, Cochin
Department of Physics, Cochin University of Science and Technology, Cochin-682022
V.P.N. Nampoori, Cochin University of Science and Technology, Cochin
Department of Physics, Cochin University of Science and Technology, Cochin-682022
K. Sathianandan, Cochin University of Science and Technology, Cochin
Department of Physics, Cochin University of Science and Technology, Cochin-682022
Published
2013-01-01
How to Cite
Reghunath, A., Venkataramanan, V., Suviseshamuthu, D., Krishnamohan, R., Prasad, B., Raghuveer, S., Subramanian, C., Chandrasekhar, P., Narayana, P., Ravishamkar, M., Nampoori, V., & Sathianandan, K. (2013). The Origin of Blue-Green Window and the Propagation of Radiation in Ocean Waters. Defence Science Journal, 41(1), 1-20. https://doi.org/10.14429/dsj.41.4401
Issue
Vol 41 No 1
Section
Applied Physics & Fluid Dynamics
Copyright (c) 2016 Defence Science Journal

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