April Flowers for redOrbit.com – Your Universe Online
As meteorological science advances, we have all become used to
long-term weather forecasts, such as predicting what the coming winter
might bring. A new study from the University of Washington and federal
scientists, however, has developed the first long-term forecast of
conditions that matter for Pacific Northwest fisheries.
“Being able to predict future phytoplankton blooms, ocean
temperatures and low-oxygen events could help fisheries managers,” said
Samantha Siedlecki, a research scientist at the UW-based Joint Institute for the Study of the Atmosphere and Ocean.
“This is an experiment to produce the first seasonal prediction system for the
ocean ecosystem.
We are excited about the initial results, but there is more to learn
and explore about this tool – not only in terms of the science, but also
in terms of its application,” she said.
The prototype was launched in January of this year. When it
immediately predicted low oxygen this summer off the Olympic coast,
people scoffed. However, some skeptics began to take the new tool more
seriously when an unusual low-oxygen patch developed off the Washington
coast in July. The prototype has predicted the low-oxygen trend will
continue, becoming worse in the coming months.
“We’re taking the
global climate model simulations and applying them to our coastal waters,” said
Nick Bond,
a UW research meteorologist and Washington’s state climatologist.
“What’s cutting edge is how the tool connects the ocean chemistry and
biology.”
Typically, Bond’s research concerns predicting ocean conditions
decades in advance. The forecasts he distributes in his job as state
climatologist, however, are quarterly weather predictions. He decided to
combine the two with this project, creating a season approach to marine
forecasts.
“Simply knowing if things are likely to get better, or worse, or stay the same, would be really useful,” said collaborator
Phil Levin, a biologist at NOAA’s Northwest Fisheries Science Center.
For example, if fisheries had early warning of negative trends, it could help them set quotas.
“Once you overharvest, a lot of regulations kick in,” Levin said. “By avoiding
overfishing you don’t get penalized, you keep the stock healthier and you’re able to maintain fishing at a sustainable level.”
The new tool is called the JISAO Seasonal Coastal Ocean Prediction of
the Ecosystem, which the scientist dubbed J-SCOPE. J-SCOPE is still in
the testing stages and it remains to be seen whether the initial
low-oxygen prediction was beginner’s luck or proof it can predict
regions where strong
phytoplankton blooms will end up causing low-oxygen conditions.
Global climate models that can predict elements of the weather up to
nine months in advance are used by J-SCOPE, which feeds those results
into a regional coastal ocean model – created by the UW Coastal Modeling
Group. This ocean model simulates the intricate subsea canyons, shelf
breaks and river plumes of the Pacific Northwest coastline. This is
combined with a new UW oxygen model developed by Siedlecki that
calculates where currents and chemistry promote the growth of marine
plants, or phytoplankton, and where those plants will decompose and, in
turn, affect oxygen levels and other properties of the ocean water.
All of these calculations allow J-SCOPE to create a nine month
forecast for Washington and Oregon sea surface temperatures, oxygen at
various depths, acidity, and
chlorophyll,
a measure of the marine plants that feed most fish. This fall, the
researchers plan to add sardine habitat maps. The team eventually hopes
to publish forecasts specific to other fish, such as tuna and salmon.
The model was fine-tuned by comparing its results for past seasons to
actual measurements collected by the Northwest Association of Networked
Ocean Observing Systems (
NANOOS),
a UW based group that hosts the forecasts as a forward-looking
complement to its growing archive of Pacific Northwest ocean
observations.
The new tool should be able to predict elements of the ocean
ecosystem up to six months in advance, according to Siedlecki’s
analyses. If the forecasts prove as reliable as the researchers hope,
they could become part of a new management approach that requires
knowing and predicting how different parts of the ocean ecosystem
interact.
“The climate predictions have gotten to the point where they have
six-month predictability globally, and the physics of the regional model
and observational network are at the point where we’re able to do this
project,” Siedlecki said. The project will be presented to the
Pacific Fishery Management Council,
the regulatory body for West Coast fisheries, this year. The
researchers will work with NANOOS to reach tribal, state, and local
fisheries managers.