| DOI: | 10.1175/JCLI-D-12-00671.1
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| Scopus记录号: | 2-s2.0-84880695550
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| 论文题名: | Antarctic low-tropospheric humidity inversions: 10-yr climatology |
| 作者: | Nygård T.; Valkonen T.; Vihma T.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2013
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| 卷: | 26, 期:14 | | 起始页码: | 5196
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| 结束页码: | 5204
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| 语种: | 英语
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| Scopus关键词: | Atmospheric moisture
; Horizontal advection
; Humidity and temperatures
; Humidity inversions
; Spatial variability
; Statistical characteristics
; Temperature inversions
; Water vapor contents
; Atmospheric pressure
; Atmospheric temperature
; Climatology
; Radiosondes
; Water vapor
; Atmospheric humidity
; atmospheric moisture
; atmospheric pressure
; climatology
; humidity
; marine atmosphere
; seasonal variation
; temperature inversion
; troposphere
; water vapor
; Antarctica
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| 英文摘要: | Humidity inversions are nearly permanently present in the coastal Antarctic atmosphere. This is shown based on an investigation of statistical characteristics of humidity inversions at 11 Antarctic coastal stations using radiosonde data from the Integrated Global Radiosonde Archive (IGRA) from 2000 to 2009. The humidity inversion occurrence was highest in winter and spring, and high atmospheric pressure and cloud-free conditions generally increased the occurrence. A typical humidity inversion was less than 200 m deep and 0.2 g kg21 strong, and a typical humidity profile contained several separate inversion layers. The inversion base height had notable seasonal variations, but generally the humidity inversions were located at higher altitudes than temperature inversions. Roughly half of the humidity inversions were associated with temperature inversions, especially near the surface, and humidity and temperature inversion strengths as well as depths correlated at several stations. On the other hand, approximately 60% of the humidity inversions were accompanied by horizontal advection of water vapor increasing with height, which is also a probable factor supporting humidity inversions. The spatial variability of humidity inversions was linked to the topography and the water vapor content of the air. Compared to previous results for the Arctic, the most striking differences in humidity inversions in the Antarctic were a much higher frequency of occurrence in summer, at least under clear skies, and a reverse seasonal cycle of the inversion height. The results can be used as a baseline for validation of weather prediction and climate models and for studies addressing changes in atmospheric moisture budget in the Antarctic. ©2013 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/51815
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Finnish Meteorological Institute, University of Helsinki, Helsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland
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| Recommended Citation: | |
Nygård T.,Valkonen T.,Vihma T.. Antarctic low-tropospheric humidity inversions: 10-yr climatology[J]. Journal of Climate,2013-01-01,26(14)
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