scholarly journals Structure of a shear-line polar low

2016 ◽  
Vol 143 (702) ◽  
pp. 12-26 ◽  
Author(s):  
D. E. Sergeev ◽  
I. A. Renfrew ◽  
T. Spengler ◽  
S. R. Dorling
Keyword(s):  
Shear Line ◽  
Polar Low

Predicted hazard area for a polar low

1987 ◽  
Vol 39 (4) ◽  
pp. 390-396 ◽  
Author(s):  
Karl J. Eidsvik
Keyword(s):  
Polar Low ◽  
Hazard Area

scholarly journals A Polar Low Pair over the Norwegian Sea

2009 ◽  
Vol 137 (8) ◽  
pp. 2559-2575 ◽  
Author(s):  
Burghard Brümmer ◽  
Gerd Müller ◽  
Gunnar Noer
Keyword(s):  
Heat Budget ◽  
Cloud Layer ◽  
Sea Surface ◽  
Cloud Base ◽  
Aircraft Measurements ◽  
Polar Lows ◽  
The North ◽  
Polar Low ◽  
Upper Level Jet ◽  
Almost All

Abstract During the Lofotes cyclone experiment (LOFZY 2005), two polar lows developed one behind the other inside a cold-air outbreak from the north in the lee of Spitsbergen on 7 March 2005. Buoys, ship, and aircraft measurements as well as satellite imagery are applied to analyze the polar low bulk properties, the horizontal and vertical structure, and the mass, moisture, and heat budget. The lifetime of the system until landfall at northern Norway was 12 h. The generation occurred under the left exit region of an upper-level jet with 70 m s−1. Both polar lows had a radius of 100–130 km and extended to a height of about 2.5 km. The propagation speeds were within 14–17 m s−1 and correspond to the vertically averaged wind velocity of the lowest 2.5 km. In the polar low centers the pressure was about 2–3 hPa lower and the air was 1–2 K warmer and drier than in the surroundings. Aircraft measurements in the second of the two polar lows show an embedded frontlike precipitation band north of the center. Here, the highest low-level winds with 25 m s−1 and the largest fluxes of sensible and latent heat with 290 and 520 W m−2, respectively, were measured (areal averages amounted to 115 and 190 W m−2). Aircraft data show mass convergence in the subcloud layer (0–900 m) and divergence in the cloud layer (900–2500 m). Moisture supply by evaporation from the sea surface was about twice as large as that by convergence in the subcloud layer. The condensation rate in the cloud layer nearly equaled the rate of evaporation at the sea surface. Almost all condensed cloud water was converted to precipitation water. Only half of the precipitation at the cloud base reached the sea surface.

scholarly journals Differences in lipidome and metabolome organization of prefrontal cortex among human populations

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Anna Tkachev ◽  
Vita Stepanova ◽  
Lei Zhang ◽  
Ekaterina Khrameeva ◽  
Dmitry Zubkov ◽  
...  
Keyword(s):  
Han Chinese ◽  
Human Populations ◽  
Cortical Region ◽  
Molecular Phenotype ◽  
Logistic Regression Models ◽  
Prefrontal Cortical ◽  
Age Dependent ◽  
Polar Low ◽  
The Brain ◽  
Two Populations

AbstractHuman populations, despite their overwhelming similarity, contain some distinct phenotypic, genetic, epigenetic, and gene expression features. In this study, we explore population differences at yet another level of molecular phenotype: the abundance of non-polar and polar low molecular weight compounds, lipids and metabolites in the prefrontal cortical region of the brain. We assessed the abundance of 1,670 lipids and 258 metabolites in 146 Han Chinese, 97 Western European, and 60 African American individuals of varying ages, covering most of the lifespan. The statistical analysis and logistic regression models both demonstrated extensive lipid and metabolic divergence of the Han Chinese individuals from the other two populations. This divergence was age-dependent, peaking in young adults, and involved metabolites and lipids clustering in specific metabolic pathways.

Targeted observations of a polar low in the Norwegian Sea

2011 ◽  
Vol 137 (660) ◽  
pp. 1688-1699 ◽  
Author(s):  
E. A. Irvine ◽  
S. L. Gray ◽  
J. Methven
Keyword(s):  
Norwegian Sea ◽  
Polar Low ◽  
Targeted Observations
Sign in / Sign up

Export Citation Format

Share Document