| DOI: | 10.1175/JCLI-D-13-00721.1
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| Scopus记录号: | 2-s2.0-84905191735
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| 论文题名: | Midlatitude moisture contribution to recent Arctic tropospheric summertime variability |
| 作者: | Laliberté F.; Kushner P.J.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2014
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| 卷: | 27, 期:15 | | 起始页码: | 5693
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| 结束页码: | 5707
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| 语种: | 英语
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| Scopus关键词: | Climate change
; Global warming
; Heat flux
; Troposphere
; Arctic
; Heat budgets/fluxes
; Interannual variability
; Latent heating/cooling
; Reanalysis
; Enthalpy
; annual variation
; atmospheric moisture
; climate change
; climate modeling
; climatology
; global warming
; heat budget
; heat flux
; summer
; temperature anomaly
; troposphere
; Arctic
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| 英文摘要: | The dynamics of late summer Arctic tropospheric heat content variability is studied using reanalyses. In both trends and interannual variability, much of the August heat content variability in the Arctic midtroposphere can be explained by the total-sensible plus latent-heat content variability at the midlatitude near surface in July. Climate models suggest that this connection is part of the global warming signal in September-November, but in reanalyses the connection is most strongly present in July-August variability and trends. It is argued that heat content signals are propagated from the midlatitude near surface to the Arctic midtroposphere approximately along climatological moist isentropes. High-frequency data reveal that the propagating signal is primarily driven by a few strong meridional heat flux events each summer season. Composite analysis on these events shows that August meridional heat fluxes into the Arctic midtroposphere are succeeded by positive heat content anomalies in the lower troposphere a few days later. This second connection between the Arctic midtroposphere and the Arctic lower troposphere could be sufficient to explain some of the recent Arctic 850-hPa temperature variability north of 75°N. © 2014 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/51312
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Physics, University of Toronto, Toronto, ON, Canada
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| Recommended Citation: | |
Laliberté F.,Kushner P.J.. Midlatitude moisture contribution to recent Arctic tropospheric summertime variability[J]. Journal of Climate,2014-01-01,27(15)
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