| DOI: | 10.1175/JCLI-D-16-0666.1
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| Scopus记录号: | 2-s2.0-85017938948
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| 论文题名: | Observational evidence linking arctic supercooled liquid cloud biases in CESM to snowfall processes |
| 作者: | McIlhattan E.A.; L'Ecuyer T.S.; Miller N.B.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2017
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| 卷: | 30, 期:12 | | 起始页码: | 4477
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| 结束页码: | 4495
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| 语种: | 英语
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| Scopus关键词: | Cryogenic liquids
; Energy balance
; Ice
; Interfacial energy
; Liquids
; NASA
; Snow
; Supercooling
; Arctic
; Cloud parameterizations
; Cloud radiative effects
; Satellite observations
; Surface observation
; Climate models
; climate modeling
; cloud radiative forcing
; global climate
; parameterization
; satellite imagery
; snow
; surface energy
; Arctic
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| 英文摘要: | Clouds are a key regulator of Earth's surface energy balance. The presence or absence of clouds, along with their macroscale and microscale characteristics, is the primary factor modulating the amount of radiation incident on the surface. Recent observational studies in the Arctic highlight the ubiquity of supercooled liquid-containing clouds (LCCs) and their disproportionately large impact on surface melt. Global climate models (GCMs) do not simulate enough Arctic LCCs compared to observations, and thus fail to represent the surface energy balance correctly. This work utilizes spaceborne observations from NASA's A-Train satellite constellation to explore physical processes behind LCCs and surface energy biases in the Community Earth System Model Large Ensemble (CESM-LE) project output. On average CESM-LE underestimates LCC frequency by ~18% over the Arctic, resulting in a ~20 W m-2 bias in downwelling longwave radiation (DLR) over the ~18 × 106 km2 area examined. Collocated observations of falling snow and LCCs indicate that Arctic LCCs produce precipitation ~13% of the time. Conversely, CESM-LE generates snow in ~70% of LCCs. This result indicates that the Wegener-Bergeron-Findeisen (WBF) process-the growth of ice at the expense of supercooled liquid-may be too strong in the model, causing ice to scavenge polar supercooled cloud liquid too efficiently. Ground-based observations from Summit Station, Greenland, provide further evidence of these biases on a more local scale, suggesting that CESM-LE overestimates snow frequency in LCCs by ~52% at the center of the ice sheet leading to ~21% too few LCCs and ~24 W m-2 too little DLR. © 2017 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/49656
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | University of Wisconsin-Madison, Madison, WI, United States; University of Colorado Boulder, Boulder, CO, United States
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| Recommended Citation: | |
McIlhattan E.A.,L'Ecuyer T.S.,Miller N.B.. Observational evidence linking arctic supercooled liquid cloud biases in CESM to snowfall processes[J]. Journal of Climate,2017-01-01,30(12)
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