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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a...
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A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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Heatwave attribution based on reliable operational weather forecasts.

Nicholas J Leach1,2, Christopher D Roberts3, Matthias Aengenheyster4,3

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Human activity made the 2021 Pacific Northwest heatwave 8 times more likely. The risk of such extreme weather events is doubling every 20 years due to global warming, impacting adaptation planning.

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Area of Science:

  • Climate science
  • Extreme weather attribution

Background:

  • The 2021 Pacific Northwest heatwave's intensity challenged traditional extreme weather attribution methods.
  • Conventional statistical and climate models struggled to fully capture the event's physics.

Purpose of the Study:

  • To quantify the influence of human-induced climate change on the 2021 Pacific Northwest heatwave.
  • To assess the future likelihood of similar extreme heat events under continued global warming.

Main Methods:

  • Utilizing state-of-the-art operational weather prediction systems to simulate the heatwave's detailed physics.
  • Leveraging these simulations for forecast-based attribution analysis.

Main Results:

  • Human influence made the 2021 Pacific Northwest heatwave at least 8 times more likely (with a 95% confidence interval of 2-50 times).
  • The likelihood of such an event is projected to double every 20 years (95% CI: 10-50 years) at the current rate of global warming.
  • Forecast-based attribution offers a synthesized approach to understanding extreme event risk.

Conclusions:

  • Human-induced climate change significantly increases the probability of extreme heat events like the 2021 Pacific Northwest heatwave.
  • The rapid increase in event likelihood necessitates urgent consideration for climate change adaptation planning.
  • Developing routine forecast-based attribution services is crucial for estimating climate change risks in extreme weather.