| DOI: | 10.1002/grl.50871
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| 论文题名: | On the global character of overlap between low and high clouds |
| 作者: | Yuan T.; Oreopoulos L.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8494
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| EISSN: | 1944-8225
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| 出版年: | 2013
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| 卷: | 40, 期:19 | | 起始页码: | 5320
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| 结束页码: | 5326
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| 语种: | 英语
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| 英文关键词: | cloud overlap
; cloud regimes
; ice cloud
; low cloud
; tropopause
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| Scopus关键词: | Active satellites
; Cloud overlap
; Cold air outbreak
; Ice clouds
; Large-scale dynamics
; Spatial variability
; tropopause
; Vertical separation
; Earth sciences
; Geophysics
; Clouds
; cloud
; correlation
; geographical distribution
; global climate
; land-sea interaction
; marine atmosphere
; satellite sensor
; spatial variation
; subsidence
; tropopause
; winter
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| 英文摘要: | The global character of overlap between low and high clouds is examined using active satellite sensors. Low-cloud fraction has a strong land-ocean contrast with oceanic values double those over land. Major low-cloud regimes include not only the eastern ocean boundary stratocumulus and shallow cumulus but also those associated with cold air outbreaks downwind of wintertime continents and land stratus over particular geographic areas. Globally, about 30% of low clouds are overlapped by high clouds. The overlap rate exhibits strong spatial variability ranging from higher than 90% in the tropics to less than 5% in subsidence areas and is anticorrelated with subsidence rate and low-cloud fraction. The zonal mean of vertical separation between cloud layers is never smaller than 5 km and its zonal variation closely follows that of tropopause height, implying a tight connection with tropopause dynamics. Possible impacts of cloud overlap on low clouds are discussed. Key Points The overlap occurs about 12% time and 30% for low clouds The overlap rate is tightly controlled by large-scale dynamics Vertical separation is large and its variability follows tropopause dynamics ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884787253&doi=10.1002%2fgrl.50871&partnerID=40&md5=563bdbd91fd206514daeca7c8182fb54
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| Citation statistics: |
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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/5758
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Climate and Radiation Laboratory, NASA Goddard Space Flight Center, Mail Code 613, Greenbelt, MD 20771, United States
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| Recommended Citation: | |
Yuan T.,Oreopoulos L.. On the global character of overlap between low and high clouds[J]. Geophysical Research Letters,2013-01-01,40(19).
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