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Space Science Reviews

, Volume 94, Issue 1–2, pp 199–214 | Cite as

The Effect of Solar UV Irradiance Variations on the Earth's Atmosphere

  • Alice Larkin
  • Joanna D. Haigh
  • Samy Djavidnia
Article

Abstract

The response of the lower and middle atmosphere to variations in solar irradiance typical of those observed to take place over the 11-year activity cycle has been investigated. The effects on radiative heating rates of changing total solar irradiance, solar spectral irradiance and two different assumptions concerning stratospheric ozone have been studied with a radiative transfer code. The response in the stratosphere depends on the changes specified in the ozone distribution which is not well known. A general circulation model (GCM) of the atmosphere up to 0.1 mbar (about 65 km) has been used to study the impacts of these changes on the thermodynamical structure. The results in the troposphere are very similar to those reported by Haigh99 using a quite different GCM. In the middle atmosphere the model is able to reproduce quite well the observed seasonal evolution of temperature and wind anomalies. Calculations of radiative forcing due to solar variation are presented. These show that the thermal infrared component of the forcing, due to warming of the stratosphere, is important but suggest a near balance between the longwave and shortwave effects of the increased ozone so that ozone change may not be important for net radiative forcing. However, the structure of the ozone change does affect the detailed temperature response and the spectral composition of the radiation entering the troposphere.

Keywords

Ozone General Circulation Model Solar Irradiance Wind Anomaly Total Solar Irradiance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Alice Larkin
    • 1
    • 2
  • Joanna D. Haigh
    • 1
    • 2
  • Samy Djavidnia
    • 1
    • 2
  1. 1.Blackett LaboratoryUK
  2. 2.Technology and MedicineImperial College of ScienceLondonUK

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