In-house Test facilities for Indigenized Underwater profiling drifter

Author(s) : Sarojani Maurya , Muthuvel P, Thangavel C. Nitesh Verma, Arumugam P. Rajkumar Bennet, Tata Sudhakar

Volume & Issue : VOLUME 1 / 2016 , ISSUE 1

Page(s) : 38-43


The earth has 71% of ocean. Ocean has an important role in regulating global climate. Variety of ocean observation systems have being deployed to observe ocean over time and space scale. The international ARGO program is a global array of more than 3000 free drifting floats which provides real time data for climate and ocean science [6]. This program is a collaborative partnership of more than 30 countries. The data from these profilers will enhance our understanding on the coupling between the oceans and atmosphere. This includes regional and global changes in ocean temperature, heat content, salinity and freshwater content, the steric height of the sea surface in relation to total sea level and largescale ocean circulation.The inferred drifts at the parking depth at 2000m and at surface are utilized for deriving the flow patterns. India has been actively contributing to the ARGO International project for global ocean monitoring. Towards the contribution to ARGO International program, NIOT has developed an Autonomous Underwater Profiling Drifter (AUPD) which profiles the sea in temporal and spatial grid up to 2000m depth. AUPD has been successfully demonstrated in Arabian Sea for more than 250 days.


ocean observation systems, profilers, ARGO, AUPD


[1] Argo Science Team, 1998. On the design and
Implementation of Argo – An initial Plan for a
global array of Profiling Floats. International
CLIVAR project Office ICPO Report No.21.
GODAE Report No 5. Published by the GODAE
International Project office, c/o Bureau of
Meteorology, Melbourne, Australia, 32pp.
[2] Ravichandran, M,Vinayachandran, P.N., and
Joseph, S and Radhakrishnan, K (2004) Results from
the first Argo float deployed by India. In: Current
Science, 86 (5). pp. 651-659.
[3] Swift, D. and S. Riser, “RAFOS Floats: Defining
and Targeting Surfaces of Neutral Buoyancy”,
Journal of Atmospheric and Oceanic Technology,
11(4), 1079-1092, (1994).
[4] Qiao Gang, Asim Ismail, Feng Zhou, Liu Song
Zuo, “Channel as seen by an Argo Float: Study
fromArabian Sea” in Oceans, 2013.
[5] Izawa, K., Mizuno, K., Miyazaki, M., Inoue, A.,
Ando, K., Takatsuki, Y., Kobayashi, T., Takeuchi,
K., 2001: On the weight adjustment of profiling
float. Kaiyo Kagaku Gijutsu Senta Shiken Kenkyu
Hokoku, no. 44, pp. 181-196.