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Related Concept Videos

Global Climate Change01:50

Global Climate Change

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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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Sublimation01:03

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Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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The Carbon Cycle01:14

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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Related Experiment Video

Updated: May 26, 2025

Production and Measurement of Organic Particulate Matter in the Harvard Environmental Chamber
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Injecting solid particles into the stratosphere could mitigate global warming but currently entails great

Sandro Vattioni1,2, Thomas Peter1, Rahel Weber1,2,3

  • 1Institute of Atmospheric and Climate Science, ETH Zürich, Zurich, ZH Switzerland.

Communications Earth & Environment
|February 24, 2025
PubMed
Summary

Stratospheric aerosol injection using solid alumina or calcite particles may reduce stratospheric warming and diffuse radiation compared to sulfur dioxide. Further research is needed to fully understand potential ozone layer impacts.

Keywords:
Atmospheric chemistryClimate and Earth system modellingClimate-change mitigationEnvironmental health

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Area of Science:

  • Climate Science
  • Atmospheric Chemistry
  • Geoengineering

Background:

  • Stratospheric aerosol injection (SAI) is proposed to mitigate global warming.
  • SAI using sulfate aerosols may cause stratospheric warming and ozone depletion.
  • Alternative stratospheric aerosol materials are needed.

Purpose of the Study:

  • To investigate solid alumina and calcite particles as alternatives to sulfate aerosols for SAI.
  • To model the potential benefits and drawbacks of these solid aerosols.
  • To assess impacts on stratospheric temperature and ozone layer.

Main Methods:

  • Utilized an experimentally informed aerosol-chemistry-climate model.
  • Simulated injection of solid alumina and calcite particles.
  • Compared results to sulfur dioxide injection scenarios.

Main Results:

  • Solid particle injection reduced stratospheric warming by up to 70% and diffuse radiation by up to 40% compared to sulfur dioxide.
  • Simulated radiative forcing of -1 W m-2 resulted in minimal ozone changes under likely scenarios.
  • Sizable uncertainties in ozone changes (-14% to +4%) exist due to unknown chemical and microphysical processes.

Conclusions:

  • Solid alumina and calcite show potential benefits over sulfate aerosols for SAI.
  • Understanding heterogeneous chemistry and microphysics is crucial for accurate ozone impact assessment.
  • Kinetic laboratory studies are recommended to reduce uncertainties in SAI modeling.