DOI: 10.1002/2014MS000420
Scopus记录号: 2-s2.0-85027947537
论文题名: Ertel potential vorticity versus Bernoulli streamfunction in earth's extratropical atmosphere
作者: Du J ; , Dowling T ; E ; , Bradley M ; E
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 437
结束页码: 458
语种: 英语
英文关键词: Ionosphere
; Vorticity
; Active regions
; basic state
; Ertel potential vorticity
; Extratropical
; Polar Regions
; Slope parameter
; Streamfunctions
; Vertical profile
; Earth atmosphere
; correlation
; data set
; Earth
; extratropical environment
; mesosphere
; polar region
; potential vorticity
; stratosphere
; vertical profile
英文摘要: We investigate the correlation of Ertel potential vorticity, Q, with Bernoulli streamfunction, B, on potentialerature surfaces, θ, in Earth's atmosphere poleward of ±30- latitude. For input, we use the 1979-2010 CMAM30-SD specified-dynamics data set. We fit the model Q=Q0exp[-λ0(B-B0)] separately in the midlatitude [30-,60-) and polar [60-,90-] regions, and nondimensionalize the slope parameter as λ0≡(NH¯)2λ0. In the troposphere, the peak of λ0 is approximately 2-3 in winter and 3-4 in summer in both regions. In the stratosphere during winter, both λ0|midlat and λ0|polar hover around unity. In spring and fall, λ0|polar continues to hover near unity, but λ0|midlat rises by a factor of two, with its maximum located at θ700 to 900-K. In summer, the polar value drops to |λ0|polar蠐1, while the midlatitude value swings negative to λ0|midlat-2 to -3. In the mesosphere, λ0 exhibits incessant fluctuations with values that usually fall within the range 0 to 1. The results support the paradigm |λ0|蠐1 for dynamically active regions primarily in the vicinity of θ3000- 4000-K (-62- 72-km) in the mesosphere, whereas except in summer, we get the simple result that the monthly climate-averaged profile, λ0, in the polar regions is nearly unity across the entire stratosphere. During extended recoveries following SSWs, the midlatitude vertical profile develops a peak near 2000 K that descends over the course of a few weeks, alongside the descent of the elevated stratopause in the polar region. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76014
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Department of Physics and Astronomy, University of Louisville, Louisville, KY, United States; Department of Mathematics, University of Louisville, Louisville, KY, United States
Recommended Citation:
Du J,, Dowling T,E,et al. Ertel potential vorticity versus Bernoulli streamfunction in earth's extratropical atmosphere[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)