A 3D simulation of the early winter distribution of reactive chlorine in the north polar vortex

1993 ◽  
Vol 20 (12) ◽  
pp. 1271-1274 ◽  
Author(s):  
A. Douglass ◽  
R. Rood ◽  
J. Waters ◽  
L. Froidevaux ◽  
W. Read ◽  
...  
Keyword(s):  
Polar Vortex ◽  
3D Simulation ◽  
Early Winter ◽  
The North ◽  
Winter Distribution ◽  
North Polar ◽  
North Polar Vortex

Penetration of Mt. Pinatubo aerosols into the north polar vortex

1992 ◽  
Vol 19 (17) ◽  
pp. 1751-1754 ◽  
Author(s):  
James M. Rosen ◽  
Norman T. Kjome ◽  
Hans Fast ◽  
Vyacheslav U. Khattatov ◽  
Vladimir V. Rudakov
Keyword(s):  
Polar Vortex ◽  
The North ◽  
North Polar ◽  
North Polar Vortex

scholarly journals On the dynamical nature of Saturn’s North Polar hexagon

2018 ◽  
Author(s):  
LMD
Keyword(s):  
Unstable Mode ◽  
Polar Vortex ◽  
Coupled System ◽  
Hexagonal Structure ◽  
Water Model ◽  
Moist Convection ◽  
Vortex System ◽  
The North ◽  
North Polar ◽  
North Polar Vortex

An explanation of long-lived Saturn’s North Polar hexagonal circumpolar jetin terms of instability of the coupled system polar vortex - circumpolar jet isproposed in the framework of the rotating shallow water model, wherescarcely known vertical structure of the Saturn’s atmosphere is averaged out.The absence of a hexagonal structure at Saturn’s South Pole is explainedsimilarly. By using the latest state-of-the-art observed winds in Saturn’spolar regions a detailed linear stability analysis of the circumpolar jet isperformed (i) excluding (“jet-only” configuration), and (2) including(“jet+vortex” configuration) the north polar vortex in the system. A domainof parameters: latitude of the circumpolar jet and curvature of its azimuthalvelocity profile, where the most unstable mode of the system has azimuthalwavenumber 6, is identified. Fully nonlinear simulations are then performed,initialized either with the most unstable mode of small amplitude, or withthe random combination of unstable modes. It is shown that developingbarotropic instability of the “jet+vortex” system produces a long-livingstructure akin to the observed hexagon, which is not the case of the“jet-only” system, which was studied in this context in a number of papersin literature. The north polar vortex, thus, plays a decisive dynamical role.The influence of moist convection, which was recently suggested to be at theorigin of Saturn’s north polar vortex system in the literature, is investigatedin the framework of the model and does not alter the conclusions.

Interannual variability of the North Polar Vortex in the lower stratosphere during the UARS Mission

1996 ◽  
Vol 23 (3) ◽  
pp. 289-292 ◽  
Author(s):  
R. W. Zurek ◽  
G. L. Manney ◽  
A. J. Miller ◽  
M. E. Gelman ◽  
R. M. Nagatani
Keyword(s):  
Interannual Variability ◽  
Lower Stratosphere ◽  
Polar Vortex ◽  
The North ◽  
North Polar ◽  
North Polar Vortex

Has the stratospheric HCl in the Northern Hemisphere been increasing since 2005

2020 ◽  
Author(s):  
Yuanyuan Han ◽  
Wenshou Tian ◽  
Fei Xie
Keyword(s):  
Northern Hemisphere ◽  
Linear Trend ◽  
Polar Vortex ◽  
Joint Effect ◽  
Residual Circulation ◽  
Quasi Biennial Oscillation ◽  
Middle Latitudes ◽  
North Polar ◽  
North Polar Vortex ◽  
Biennial Oscillation

<p>Stratospheric hydrogen chloride (HCl) is the main stratospheric reservoir of chlorine, deriving from the decomposition of chlorine-containing source gases. Its trend has been used as a metrics of ozone depletion or recovery. Using the latest satellite observations, the authors find that a significant increase of Northern Hemisphere stratospheric HCl during 2010–2011 can mislead trends of HCl in recent decades. Agree with previous studies, HCl increased from 2005 to 2011; while when removing the large increase of stratospheric HCl during 2010–2011, the increasing linear trend from 2005 to 2011 becomes weak and insignificant, in addition, the linear trend of Northern Hemisphere stratospheric HCl from 2005 to 2016 also shows weak and insignificant. The significant increase of HCl during 2010–2011 is attributed to a super strong north polar vortex and a reduced residual circulation during 2010–2011, which slowed down the transport of HCl from the low–mid latitudes to the high latitudes, leading to accumulation of HCl in the middle latitudes of the stratosphere during 2010–2011. Further analysis suggests that the strong polar vortex and the reduced residual circulation were caused by the joint effect of a La Niña event and the west phase of the quasi-biennial oscillation.</p>

scholarly journals Surface impacts of the Quasi Biennial Oscillation

2017 ◽  
Author(s):  
Lesley J. Gray ◽  
James A. Anstey ◽  
Yoshio Kawatani ◽  
Hua Lu ◽  
Scott Osprey ◽  
...  
Keyword(s):  
North Pacific ◽  
Polar Vortex ◽  
Late Winter ◽  
Early Winter ◽  
Quasi Biennial Oscillation ◽  
Stratospheric Polar Vortex ◽  
Tropical Precipitation ◽  
The North ◽  
Biennial Oscillation ◽  
The North Pacific

Abstract. Teleconnections between the Quasi Biennial Oscillation (QBO) and the Northern Hemisphere zonally-averaged zonal winds, mean sea level pressure (mslp) and tropical precipitation are explored using regression analysis. A novel technique is introduced to separate responses associated with the stratospheric polar vortex from other underlying mechanisms. A previously reported mslp response in January, with a pattern that resembles the positive phase of the North Atlantic Oscillation (NAO) under QBO westerly conditions, is confirmed and found to be primarily associated with a QBO modulation of the stratospheric polar vortex. This mid-winter response is relatively insensitive to the exact height of the maximum QBO westerlies and a maximum response occurs with westerlies over a relatively deep range between 10–70 hPa. Two additional mslp responses are reported, in early winter (December) and late winter (February/March). In contrast to the January response the early and late winter responses show maximum sensitivity to the QBO winds at ~ 20 hPa and ~ 70 hPa but are relatively insensitive to the QBO winds in between (~ 50 hPa). The late winter response is centred over the North Pacific and is associated with QBO influence from the lowermost stratosphere at tropical/subtropical latitudes. The early winter response consists of anomalies over both the North Pacific and Europe, but the mechanism is unclear and requires further investigation. QBO anomalies are found in tropical precipitation amounts and a southward shift of the Inter-tropical Convergence Zone under westerly QBO conditions is also evident.

Sign in / Sign up

Export Citation Format

Share Document