A detailed, long -
term ocean temperature record derived from corals on Christmas Island in Kiribati and other islands in the tropical Pacific shows that the extreme warmth of recent El Niño events reflects not just the natural ocean - atmosphere cycle but a new factor: global warming caused by human activity.
Not exact matches
The scientists, led by Eric Oliver of Dalhousie University in Canada, investigated long -
term heat wave trends using a combination of satellite data collected since the 1980s and direct
ocean temperature measurements collected throughout the 21st century to construct a nearly 100 - year
record of marine heat wave frequency and duration around the world.
So the report notes that the current «pause» in new global average
temperature records since 1998 — a year that saw the second strongest El Nino on
record and shattered warming
records — does not reflect the long -
term trend and may be explained by the
oceans absorbing the majority of the extra heat trapped by greenhouse gases as well as the cooling contributions of volcanic eruptions.
The long -
term warming of the planet, as well as an exceptionally strong El Niño, led to numerous climate
records in 2015, including milestones for global
temperatures, carbon dioxide levels and
ocean heat, according to the World Meteorological Organization's annual State of the Climate Report.
The satellites provide long -
term, continuous information about what's happening on the
ocean's surface,
recording sea level and surface
temperatures, for example.
In addition, since the global surface
temperature records are a measure that responds to albedo changes (volcanic aerosols, cloud cover, land use, snow and ice cover) solar output, and differences in partition of various forcings into the
oceans / atmosphere / land / cryosphere, teasing out just the effect of CO2 + water vapor over the short
term is difficult to impossible.
It has been
recorded since the 1960s in
terms of both rising
ocean temperature and rising acidity, both of which reduce the capacity to remove CO2 from the atmosphere, thereby advancing AGW and further
ocean warming.
Finally, the fact that both the
oceans and the atmosphere are at their all time highest
temperatures over the past 10 year average from instrument
record and through extrapolation to near -
term paleodata, we can see a remarkable consistent effect of what increasing greenhouse gases do to overall alterations in Earth's non-tectonic energy storage.
Ocean temperatures: As meteorologist Angela Fritz observes, sea surface
temperatures off the Mid-Atlantic coast were near a
record high in September, and 2.3 degrees Fahrenheit above the long
term average.
«
Record high
ocean temperatures were experienced along the Western Australian coast during the austral summer of 2010/2011... This heat wave was an unprecedented thermal event in Western Australian waters, superimposed on an underlying long -
term temperature rise.»
Falling back on the surface
temperatures as the metric for the most societal relevant climate metric, even if its period of
record is longer, is not a reason to focus on it, if it does not serve the purpose of telling us if humans are significantly altering these circulation patterns, and thus the weather and
ocean conditions that matter the most in
terms of the impacts on water resources, food, energy, human health and ecosystem function.
With the next upswing in the natural fluctuations in sensible and latent heat flux from
ocean to atmosphere, the probability that new global surface
temperature records will be set is high — but the
oceans tell the story far more consistently in
terms GH forcing.