The Effect of Solar UV Irradiance Variations on the Earth's Atmosphere - Space Science Reviews

Pengaruh Variasi Iradiansi UV Matahari terhadap Atmosfer Bumi - Space Science Reviews

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ID: 270105
1970
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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.
Respons atmosfer bawah dan tengah terhadap variasi iradiansi matahari yang lazim diamati terjadi selama siklus aktivitas 11-tahunan telah diselidiki. Pengaruh perubahan iradiansi matahari total, iradiansi spektral matahari, dan dua asumsi berbeda mengenai ozon stratosfer terhadap laju pemanasan radiatif telah dipelajari menggunakan kode transfer radiatif. Respons di stratosfer bergantung pada perubahan yang ditentukan dalam distribusi ozon yang belum diketahui dengan baik. Sebuah model sirkulasi umum (GCM) atmosfer hingga 0,1 mbar (sekitar 65 km) telah digunakan untuk mempelajari dampak dari perubahan-perubahan tersebut terhadap struktur termodinamika. Hasil pada troposfer sangat mirip dengan yang dilaporkan oleh Haigh99 menggunakan GCM yang cukup berbeda. Di atmosfer tengah, model ini mampu mereproduksi dengan cukup baik evolusi musiman dari anomali suhu dan angin yang teramati. Perhitungan pemaksaan radiatif akibat variasi matahari disajikan. Hasil perhitungan ini menunjukkan bahwa komponen inframerah termal dari pemaksaan tersebut, yang disebabkan oleh pemanasan stratosfer, adalah penting, tetapi mengindikasikan adanya keseimbangan yang hampir setara antara efek gelombang panjang dan gelombang pendek dari peningkatan ozon, sehingga perubahan ozon mungkin tidak signifikan terhadap pemaksaan radiatif neto. Namun demikian, struktur perubahan ozon memengaruhi respons suhu secara terperinci serta komposisi spektral radiasi yang memasuki troposfer.
Reference Key
alice1970spacethe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Larkin, Alice;Haigh, Joanna D.;Djavidnia, Samy;Larkin, Alice;Haigh, Joanna D.;Djavidnia, Samy;
Journal space science reviews
Year 1970
DOI
doi:10.1023/A:1026771307057
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