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IUGG/IAPSO Symposium P16: Recent Improvements to Deep-Sea Research
through
use of Submersibles, Acoustic Tomography and In-situ Long Term
Observations
18-30 July 1999 - University of Birmingham, Birmingham, UK
Abstract Deadline: January 15, 1999
This special symposium will be held by IAPSO (International
Association
of Physical Sciences of the Oceans) during the XXII General Assembly of
IUGG
(International Union of Geodesy and Geophysics). This Symposium will
focus on recent progress in understanding phenomena occurring in the
water
column and/or on the bottom of the deep ocean through use of manned
research
submersibles, remotely operated vehicles (ROV and AUV), acoustic
tomography
and in-situ long-term monitoring. For example, venting of both
hydrothermal
and cold fluids from the deep ocean floor has provided a new picture of
the
mass and heat fluxes between the ocean and solid crust with possible
implications for oceanography. Repeated visual and instrumental
observation
of biological, physico-chemical, geophysical (e.g., heat-flow,
micro-earthquakes and hydropressure pulses) and geodetic (by precise
determination of axial distance) activity may provide crucial
information
regarding secular or sporadic variations, if any. Areas investigated
during
the past several years include mid-oceanic ridges such as the Lucky
Strike,
TAG and Rainbow sites in the Mid-Atlantic, the East Pacific Rise at 9°N
and
17°S, and the Juan de Fuca Ridge as well as backarc basinslike the Manus
Basin (PNG) and the Mariana and Okinawa troughs. Broader-scale
monitoring of
seismicity, volcanic events and crustal deformation with global networks
and
plate-tectonic considerations will further constraint modes of the local
and
regional variations. Cold seepage sites such as those located near
Oregon,
the Aleutians, Nankai and Hatsushima (Sagami Bay) may be other targets
for
monitoring fluid flow in convergent accretionary zones. Acoustic
tomography
is, on the other hand, capable of yielding 3-D snapshots of
oceanographic
conditions including vertical patterns of sound speed representing the
temperatures, salinity and density of sea water. Recent attempts such as
the
Acoustic Mid-Ocean Dynamics Experiment (AMODE) have set goals of
determining
the ocean mesoscale sound speed field,gyre-scale variability and
mesoscale
eddy kinematics and dynamics in comparison with numerical models. In
addition to static profiles, monitoring of time-varying invaluable
records
of global change. Interaction of bottom phenomena with global-scale
oceanographic events (e.g., El Nino) might be revealed in future by
these
efforts.
We aim to synthesize the present status of these various fields of
research
and to establish a new vision of oceanography in the next century.
Deadline
for paper submission (both title and abstract) is 15 January, 1999.
Details
of paper submission can be found in the Second Circular of the XXII
General
Assembly of IUGG available from the Local Organizing Committee
(iugg99 at bham.ac.uk) or on the web page at http://www.bham.ac.uk/IUGG99/
For further information and questions, please contact:
Convenor: Prof. Kazuo KOBAYASHI
Japan Marine Science & Technology Center (JAMSTEC)
2-15 Natsushima-cho
Yokosuka 237-0061
Japan
e-mail: kobayashik at jamstec.go.jp
FAX: 81468-663878
Co-Convenor: Dr. Alan Chave
Department of Geology and Geophysics
Woods Hole Oceanographic Institution
Woods Hole, MA 02543
USA
e-mail: achave at whoi.edu
FAX: 1-508-4572183
