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Whether current global climate patterns are human induced or
not, climate change
does takes place and weather patterns can help us
anticipate climate trends. Climate
change is the deviation of mean global temperature by as few as one or two
degrees Celsius. Spatial variability is greater than the change itself, so the melting
of glaciers and rising sea levels doesn't equate to extreme shifts in
temperature at all locations.
Scientists use stable isotopes concentrations, trapped in glacial deposits, to calculate historical ice
volume. Lighter isotopes
are more reactive and get trapped in ice through atmospheric transport. When
ice volume decreases, we see elevated concentrations of lighter isotopes in our
oceans. Although today we have rather
high sea levels and elevated concentrations of lighter stable isotopes in our
oceans, it arguably has as much to do with climate change as it does with continental drift or any other factor. When considerable land mass is located near the North and
South Poles, we would expect more ice to accumulate.
Another way to measure climate change lies in the study of
modes of variability. We study geographic locations and how climate patterns
fluctuate over a specific timeframe. An example of this is the study of as
El-Nino Southern Oscillation (ENSO) cycles. (ENSO) cycles are characterized by Southern Pacific
sea surface temperatures and associated pressure gradient across the Pacific
Ocean. During warming trends,
evaporation is amplified - the possible cause for flooding and increased storm
frequency in the Eastern Pacific. Inversely, when Southern Pacific sea surface
temperatures are cooler than expected, we experience draught.
Beyond the experienced mode itself leaves a field of
research on the severity and frequency of these events. It is at best a
hypothesis, but a popular belief is that ENSO cycles are amplified during
periods of increased climate change. Extreme weather patterns might just be
another sign that our climate is very likely to evolve in the near future.
References:
http://imanu.org/papers/PDFs/Furtado_JC_2011.pdf
http://en.wikipedia.org/wiki/Dust_Bowl
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