VERTIGO - Ocean Particle
"VERtical Transport in the Global Ocean" is a new research
project that studies the fluxes and controls on the transport
of sinking particles between the surface and deep ocean. An
interdisciplinary international team has been assembled for
field work off Hawaii and Japan in 2004 and 2005. Information
can be found here about our neutrally buoyant sediment traps
(NBST), student projects in the "Twilight Zone" and the project
and proposal details on our VERTIGO web site.
Ocean Iron Fertilization
All plants need light and nutrients to grow, and marine plants,
or plankton are no exception. Less obvious perhaps is that
there are many ocean regions where low concentrations of iron
can act as a limiting nutrient to plankton growth. Studies
of the ocean iron cycle and its impact on marine carbon fluxes
have been a focus of study by the Café Thorium in the SOIREE
and SOFeX programs.
EDDIES - Sargasso Sea
"EDdy Dynamics, mIxing, Export, and Species composition" is
the title of a new project looking at the impact of eddies,
or the dynamic mixing of ocean waters in the upper ocean of
the Sargasso Sea on the growth of marine plankton and their
fate. On the EDDIES web site you can learn more about this
multi-institution proposal which begins with field work in
Southern Ocean Carbon
Southern Ocean Carbon Cycle The Southern Ocean is defined
as those waters south of 40 degrees south, representing 20%
of the world's ocean area and truly a unique ocean setting.
Ice sheets, massive spring melts, fascinating biology and
a strong "biological pump" lead to important controls on the
ocean carbon cycle and climate.
Migration of plutonium and other radionuclides in groundwater
is a major issue at several U.S.Department of Energy sites.
We apply our methods developed to measure ultra low levels
of plutonium and other manmade radionuclides in the oceans
to groundwater systems where their association with dissolved
or colloidal forms can be important in controlling migration
from waste sites.
Since the release of Chernobyl radioactivity in late April
1986, we have been tracking the fate of waters and particles
that have been "tagged" by this localized source of manmade
radionuclides. The Chernobyl reactor site is situated 1000
km north of the Black Sea. Radioactive materials from Chernobyl
reached the Black Sea via direct fallout from the atmosphere
and transport in the Dnieper River.