Water Age Classification for LaTTE
LaTTE or Lagrangian
Transport and Transformation Experiment was conducted to
quantify mixing and the rate at which biological and chemical processes
transform material in a buoyant coastal current.
It studies the processes that control the fate and transport
of nutrients and chemical contaminants in the Hudson River plume.
does my project do?
It attempts to:
Figure out how much of the Hudson River plume contributes to
the high chlorophyll signal along the coast.
To arrive at a chlorophyll budget for the coastal waters
along the LaTTE domain.
Set thresholds to classify river plume, old river water and
Overlay ship salinity tracks on the image so generated to
prove that the algorithm used is right.
do I need?
collected as part of 2005 LaTTE effort for the month of April.
data from SeaWiFS for April
tracks for salinity from LaTTE April 2005.
What is my approach going
would I validate my algorithm?
channel ratios of nLw’s
to define high CDOM water in the Hudson and Delaware waters.
- Use the low values of
nLw-490:nLw-670 to indicate fresh river water.
- Values in between 3 and 4.5
indicate old river water (about 14 days old).
- Overlay the salinity data over the ratio-ed and
have I concluded from my project?
- Validation involves mapping salinity tracks from ship data.
- At each boundary of changing chlorophyll values we see a
corresponding change in salinity values.
- This validates the algorithm used and proves conclusively
that the technique used is correct.
- Band ratio-ing is a very effective technique for
classifying blooms and older waters in the LaTTE region.
- Plume material is transported offshore by hydrographic
- It then onverges over the 25 m isobath and then dissipates
possibly due to export flux and grazing.
- Jennifer Bosch
- Oscar Schofield
- Eli Hunter
- John Kerfoot
- Jennifer Francis