dorsal/arxiv
View SchemaLong-term variations in the correlation between NAO and solar activity: the importance of North-South solar activity asymmetry for atmospheric circulation
| Authors | Katya Georgieva, Boian Kirov, Peter Tonev, Veneta Guineva, Dimitar Atanasov |
|---|---|
| Categories | |
| ArXiv ID | physics/0702057 |
| URL | https://arxiv.org/abs/physics/0702057 |
| DOI | 10.1016/j.asr.2007.02.091 |
Abstract
General atmospheric circulation is the system of atmospheric motions over the Earth on the scale of the whole globe. Two main types of circulation have been identified: zonal - characterized by low amplitude waves in the troposphere moving quickly from west to east, and meridional with stationary high amplitude waves when the meridional transfer is intensified. The prevailing type of circulation is related to global climate. Based on many years of observations, certain circulation epochs have been defined when the same type of circulation prevails for years or decades. Here we study the relation between long-term changes in solar activity and prevailing type of atmospheric circulation, using NAO index reconstructed for the last four centuries as a proxy for large-scale atmospheric circulation. We find that when the southern solar hemisphere is more active, increasing solar activity in the secular solar cycle results in increasing zonality of the circulation, while when the northern solar hemisphere is more active, increasing solar activity increases meridional circulation. In an attempt to explain the observations, we compare the short-term reaction of NAO and NAM indices to different solar drivers: powerful solar flares, high speed solar wind streams, and magnetic clouds
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"abstract": "General atmospheric circulation is the system of atmospheric motions over the\nEarth on the scale of the whole globe. Two main types of circulation have been\nidentified: zonal - characterized by low amplitude waves in the troposphere\nmoving quickly from west to east, and meridional with stationary high amplitude\nwaves when the meridional transfer is intensified. The prevailing type of\ncirculation is related to global climate. Based on many years of observations,\ncertain circulation epochs have been defined when the same type of circulation\nprevails for years or decades. Here we study the relation between long-term\nchanges in solar activity and prevailing type of atmospheric circulation, using\nNAO index reconstructed for the last four centuries as a proxy for large-scale\natmospheric circulation. We find that when the southern solar hemisphere is\nmore active, increasing solar activity in the secular solar cycle results in\nincreasing zonality of the circulation, while when the northern solar\nhemisphere is more active, increasing solar activity increases meridional\ncirculation. In an attempt to explain the observations, we compare the\nshort-term reaction of NAO and NAM indices to different solar drivers: powerful\nsolar flares, high speed solar wind streams, and magnetic clouds",
"arxiv_id": "physics/0702057",
"authors": [
"Katya Georgieva",
"Boian Kirov",
"Peter Tonev",
"Veneta Guineva",
"Dimitar Atanasov"
],
"categories": [
"physics.space-ph"
],
"doi": "10.1016/j.asr.2007.02.091",
"title": "Long-term variations in the correlation between NAO and solar activity: the importance of North-South solar activity asymmetry for atmospheric circulation",
"url": "https://arxiv.org/abs/physics/0702057"
},
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