Talking Climate Change with Yash Negi

Episode 29: Climate Variability Part 2 (Final Part)

January 23, 2021 Season 1 Episode 29
Talking Climate Change with Yash Negi
Episode 29: Climate Variability Part 2 (Final Part)
Show Notes

In this episode of the podcast, I have talked about in depth about "Climate Variability" and it is the final part which is part-2. Climate Variability is defined as variations in the mean state and other statistics of the climate on all temporal and spatial scales, beyond individual weather events. The term "Climate Variability" is often used to denote deviations of climatic statistics over a given period of time (e.g. a month, season or year) when compared to long-term statistics for the same calendar period. Climate variability is measured by these deviations, which are usually termed anomalies. Variability may be due to natural internal processes within the climate system (internal variability), or to variations in natural or anthropogenic external factors (external variability).
Topics:

  • Introduction
  • Consequences 
  • Estimating the effects of Climate Variations
  • Causes
  • Internal Climate Variability 
  • External Climate Forcing
  •  Paleo-Eocene Thermal maximum
  • Holocene
  • The Cenozoic
  • Variability between regions

Additional Info:
 
A key difference between climate variability and change is in persistence of "anomalous” conditions - when events that used to be rare occur more frequently, or vice-versa. In statistical terms, the curve of the frequency distribution representing the probability of specific meteorological events changes. The curve may be modified either in amplitude, shifted about a new mean, or both.  The growth in greenhouse gases in the atmosphere because of anthropogenic activities is also expected to be the most important factor forcing climate to change during the 21st century. Within the atmosphere there are naturally occurring green-house gases, which trap some of the outgoing infrared radiation emitted by the earth and the atmosphere. The principal greenhouse gas is water vapour, but also carbon dioxide (CO2), ozone (O3), methane (CH4) and nitrous oxides (N2O), together with clouds, keeps the Earth’s surface and troposphere 33◦C warmer than it would otherwise be. This is the natural greenhouse effect. Changes in the concentrations of these greenhouse gases will change the efficiency with which the Earth cools to space. The atmosphere absorbs more of the outgoing terrestrial radiation from the surface when concentrations of greenhouse gases increase. This is emitted at higher altitudes and colder temperatures and results in a positive radiative forcing which tends to warm the lower atmosphere and Earth’s surface.  Climate variability and change affects individuals and societies. Within agricultural systems, seasonal climate forecasting can increase preparedness and lead to better social, economic and environmental outcomes. Climate forecasting is probably one of the oldest professions in the world. A Babylonia scroll dated to about 3000 BC may well be the oldest-known example of an attempt to predict the weather that would affect the following season’s crops. 

 
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Email: yashnegi@climatology.in
Song: Ikson - New Day (Vlog No Copyright Music)
Music provided by Vlog No Copyright Music.
Video Link: https://youtu.be/cVA-9JHwbFY 

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