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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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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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Microbes and Climate Change01:27

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Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
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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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Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
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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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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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Cirrus cloud seeding: a climate engineering mechanism with reduced side effects?

T Storelvmo1, W R Boos2, N Herger3

  • 1Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, CT 06511, USA trude.storelvmo@yale.edu.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 19, 2014
PubMed
Summary

Cirrus cloud seeding, a climate engineering method, can cool the planet by 1.4 K by reducing infrared radiation trapping. This approach shows potential for mitigating Arctic sea ice loss with fewer side effects than other methods.

Keywords:
aerosolcirrusclimate engineeringice nucleation

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Area of Science:

  • Climate Science
  • Atmospheric Science
  • Environmental Engineering

Background:

  • Climate engineering (CEMs) involves intentional climate alteration, with various proposed mechanisms.
  • Existing CEMs often focus on solar radiation management, presenting challenges like ozone recovery and hydrological cycle changes.
  • Cirrus cloud seeding, an understudied CEM, targets Earth's greenhouse effect by reducing infrared radiation trapped by high clouds.

Purpose of the Study:

  • To investigate the efficacy and potential side effects of cirrus cloud seeding as a climate engineering mechanism.
  • To model the global impact of reducing cirrus cloud lifetimes on planetary temperature and precipitation.
  • To compare different cirrus seeding strategies and their effectiveness.

Main Methods:

  • Global climate modeling was employed to simulate the effects of cirrus cloud seeding.
  • The study focused on reducing cirrus cloud lifetimes in the upper troposphere.
  • Simulations explored various seeding extents, including targeting areas with high solar noon zenith angles.

Main Results:

  • Cirrus seeding has the potential to induce a global mean cooling of approximately 1.4 K.
  • This cooling is accompanied by only a modest reduction in global rainfall.
  • Targeting specific regions (e.g., high solar noon zenith angles) can achieve significant cooling with less global coverage.
  • Cooling effects are most pronounced at high latitudes, potentially preventing Arctic sea ice loss.

Conclusions:

  • Cirrus cloud seeding presents a promising climate engineering mechanism with potentially reduced side effects compared to solar radiation management.
  • The method effectively targets the greenhouse effect by reducing infrared radiation trapping.
  • Further research is needed to address uncertainties in ice nucleation and its representation in climate models.