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Related Concept Videos

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Salinity anomaly as a trigger for ENSO events.

Jieshun Zhu1, Bohua Huang2, Rong-Hua Zhang3

  • 1Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, Virginia, USA.

Scientific Reports
|October 30, 2014
PubMed
Summary
This summary is machine-generated.

Ocean salinity, not just temperature, plays an active role in El Niño-Southern Oscillation (ENSO) events. Including salinity in forecasts improves prediction accuracy for ENSO events like La Niña.

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Area of Science:

  • Oceanography
  • Climate Science
  • Atmospheric Science

Background:

  • Classical El Niño-Southern Oscillation (ENSO) theories focus on subsurface ocean thermal structure anomalies as precursors.
  • The role of ocean salinity in ENSO evolution and forecasting has been underexplored, despite observed variations in the tropical Pacific.

Purpose of the Study:

  • To investigate the active role of ocean salinity variability in ENSO evolution.
  • To assess the impact of salinity on ENSO forecasting, specifically for El Niño events.

Main Methods:

  • Comparison of two ENSO forecast experiments: one including interannual salinity variability in initial ocean states, and one excluding it.
  • Analysis of the influence of salinity anomalies on subsurface thermal structure and ENSO development.

Main Results:

  • Salinity variability was found to be essential for accurately forecasting the 2007/08 La Niña event when initiated in April 2007.
  • Realistic salinity initial states interrupted the decay of subsurface cold conditions, contributing to La Niña development via the Bjerknes feedback.

Conclusions:

  • Ocean salinity variability plays an active role in ENSO evolution, not just a passive response.
  • Accurate, large-scale salinity observations are crucial for improving ENSO forecasts and understanding climate dynamics.