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DOI | 10.1029/2020JD032465 |
On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes | |
Naud, Catherine M.1; Booth, James F.2; Lamer, Katia2; Marchand, Roger3; Protat, Alain4; McFarquhar, Greg M.5,6 | |
2020-07-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Australia |
英文摘要 | Focusing on conditions of subsidence when low clouds are present, ground-based observations in both the North Atlantic and the Southern Ocean reveal strong relationships between cloud boundary (base and top heights) and different measures of lower tropospheric instability. The difference in potential temperature between the surface and 800 hPa (a metric called M) provides a stronger relationship than measures of inversion strength such as the lower tropospheric stability and estimated inversion strength. This is because (1) inversion strength itself does not correlate well with cloud boundaries, and (2) M contains information that appears important for cloud boundaries. These include the surface forcing through the use of sea surface rather than near-surface air temperature and an upper level close to the real cloud top. These results expand upon previous work on the importance of M as a predictor of cloud morphology. However, important differences are found in low-cloud conditions for the North Atlantic as compared to the Southern Ocean (for a given value of M): stronger inversions, deeper boundary layers, and much larger sea level pressures. Therefore, the relationship between cloud boundaries and M differs between the two regions. A general circulation model provides similar relationships as observed between M and both cloud top height and temperature but tends to place clouds higher and at colder temperatures than observed for a given M. This might cause issues with the representation of precipitation, cloud cover and radiation in the Southern Ocean. |
英文关键词 | low-level clouds southern ocean MCAO M-index CAM6 boundary layer stability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000551484700008 |
WOS关键词 | BOUNDARY-LAYER STRUCTURE ; SURFACE OBSERVATIONS ; SOUTHERN-OCEAN ; PART I ; COVER ; PRECIPITATION ; CLIMATOLOGY ; METEOROLOGY ; STABILITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/289506 |
专题 | 气候变化 |
作者单位 | 1.Columbia Univ, NASA GISS, Appl Phys & Appl Math, New York, NY 10025 USA; 2.CUNY, City Coll, Earth & Atmospher Sci, New York, NY 10021 USA; 3.Univ Washington, JISAO, Seattle, WA 98195 USA; 4.Australian Bur Meteorol, Melbourne, Vic, Australia; 5.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; 6.Univ Oklahoma, Cooperat Inst Mesoscale Meteorol Studies CIMMS, Norman, OK 73019 USA |
推荐引用方式 GB/T 7714 | Naud, Catherine M.,Booth, James F.,Lamer, Katia,et al. On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(13). |
APA | Naud, Catherine M.,Booth, James F.,Lamer, Katia,Marchand, Roger,Protat, Alain,&McFarquhar, Greg M..(2020).On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(13). |
MLA | Naud, Catherine M.,et al."On the Relationship Between the Marine Cold Air Outbreak M Parameter and Low-Level Cloud Heights in the Midlatitudes".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.13(2020). |
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