Changes
in ocean salinity, nutrient runoff and other pollution can cause small - scale bleaching, but scientists say the widespread global bleaching this year is a symptom of unusual ocean warming.
Ocean salinity changes are an indirect but potentially sensitive indicator for detecting changes in precipitation, evaporation, river runoff and ice melt.
Observations
of ocean salinity patterns for the past 50 years reveal an intensification of [P - E] patterns as predicted by models, but at an even faster rate.
This small warming is likely a result of the natural alterations in global ocean currents which are driven
by ocean salinity variations.
As the animals dive beneath the waves, sensors in the tags gather information
on ocean salinity, temperature, and depth.
The new findings on
Arctic Ocean salinity conditions in the Eocene were calculated in part by comparing ratios of oxygen isotopes locked in ancient shark teeth found in sediments on Banks Island in the Arctic Circle and incorporating the data into a salinity model.
The CCSM appeared to correctly capture key details of the late Permian, including
increased ocean salinity and sea surface temperatures in the high latitudes that paleontologists believe were 14 degrees Fahrenheit (8 degrees Celsius) higher than present.
Gray believes that the increased atmospheric heat — which he calls a «small warming» — is ``... likely a result of the natural alterations in global ocean currents which are driven by
ocean salinity variations.»
«It's going to be important in the long run,» says Lagerloef, who is leading NASA's Aquarius satellite mission to
measure ocean salinity from space.
«This study is the first to show the value of using
ocean salinity measurements to forecast the intensity of tropical cyclones,» said team lead Dr. Karthik Balaguru, an oceanographer at PNNL's Marine Sciences Laboratory.
Observations of
ocean salinity patterns for the past 50 years reveal an intensification of [P - E] patterns as predicted by models, but at an even faster rate.
Upper -
ocean salinity also increased globally by a small 0.1 percent — yet below a few hundred meters, ocean waters appear to be considerably fresher than in previous decades.»
Both satellites
mapped ocean salinity by picking up faint microwave signals emitted by the sea surface, which change along with salinity.
Monitoring ocean salinity is essential for understanding its impact on ocean circulation, Earth's water cycle, marine ecology, and climate change.
Satellite animation of
ocean salinity made using one of the same satellites used to create the new estimates of ocean acidification.
If we add ten more meters to sea level by melting ice in the coming centuries, that would reduce
mean ocean salinity by about 0.1 psu.
The integrated measures from large -
scale ocean salinity measurements are quite good, but it is difficult to work out exactly where that freshwater has come from.
Steric sea level is driven by volume changes
through ocean salinity (halosteric) and ocean temperature (thermosteric) effects, from which the latter is known to play a dominant role in observed contemporary rise of GSSL.
Maps of
ocean salinity at different ocean depths - top: surface; middle: 1 km deep; bottom: 4 km deep.
Each method used data from either NASA's Aquarius mission or the European Space Agency's Soil
Moisture Ocean Salinity (SMOS) Earth Explorer mission.
A new Indonesian coral - based record of surface
ocean salinity shows that the location of the most significant hydroclimatic feature in the Southern Hemisphere, the South Pacific Convergence Zone (SPCZ), a band of high clouds and precipitation, influences a major current in the far western Pacific Ocean.
Durack, P. J., Wijffels, S. E. & Matear, R.
J. Ocean salinities reveal strong global water cycle intensification during 1950 to 2000.
Perhaps the model results do open a door for Arctic geoengineering approaches though, for instance by influencing
Arctic Ocean salinity and heat transport or through Arctic solar radiation management.
Flying aboard the SAC - D satellite, Aquarius will
measure ocean salinity, completing a path around the entire globe every seven days.
Another satellite mission we've mentioned here, Aquarius (launched in June), has recently released its first results
on ocean salinity:
These results call for sustained monitoring
of ocean salinity, which provides an important tool for improving the existing climate prediction systems based on sea surface temperature - precipitation relationships.
They also indicated
an ocean salinity comparable to Earth's.
Ocean salinity can act as a massive rain gauge.
These include wind patterns, precipitation,
ocean salinity, sea ice, ice sheets and aspects of extreme weather.»
Scientists are hoping that newer satellites, like Europe's Soil Moisture and
Ocean Salinity or NASA's Soil Moisture Active Passive, can start to accumulate long - time series of soil moisture data.
Salt in the sea, or
ocean salinity, is mainly caused by rain washing mineral ions from the land into water.
A number of existing satellites can be used for the task; these include the European Space Agency's Soil Moisture and
Ocean Salinity (SMOS) sensor that was launched in 2009 and NASA's Aquarius satellite that was launched in 2011.
Achberger, Christner and others will be heading back out in January to drill in a different spot to sample pools of water more in
the ocean salinity range to see what they can find.