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Precipitation Processes01:12

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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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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
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Area of Science:

  • Atmospheric Science
  • Climate Science
  • Aerosol Science

Background:

  • Large wildfires generate pyrocumulonimbus (pyroCb) clouds, injecting smoke aerosols into the upper troposphere and lower stratosphere (UT/LS).
  • The radiative effects of pyroCb smoke aerosols are poorly understood due to limited direct measurements.
  • PyroCb smoke aerosols persist for months, influencing climate and atmospheric radiative balance.

Purpose of the Study:

  • To present in situ aircraft measurements of aged pyroCb smoke aerosols.
  • To address the observational gap in aerosol evolution from fresh to aged states.
  • To quantify the radiative effects of large pyroCb smoke particles.

Main Methods:

  • In situ aircraft measurements of 5-day-old pyroCb smoke aerosols.
  • Analysis of aerosol particle size distribution and composition.
  • Calculation of radiative effects based on measured aerosol properties.

Main Results:

  • Sampled pyroCb smoke contained unusually large aerosol particles (500-600 nm in diameter).
  • These large particles formed through cloud processing and coagulation in the UT/LS.
  • Large particles increased outgoing radiation by 30-36%, enhancing atmospheric radiative cooling.

Conclusions:

  • PyroCb smoke aerosols have distinct properties (larger particle sizes) compared to typical smoke.
  • Current climate models may underestimate the cooling effect of pyroCb smoke due to assumed smaller particle sizes.
  • Accurate representation of pyroCb aerosol properties is crucial for improving climate projections, especially with increasing wildfire frequency.