scholarly journals The spatial temporal regime of stream flow of the conterminous U.S. in connection with indices of global atmospheric circulation

2007 ◽  
Author(s):  
Boris Shmagin ◽  
Carol Johnston ◽  
Scott Bridgham
Keyword(s):  
Atmospheric Circulation ◽  
Stream Flow ◽  
Global Atmospheric Circulation

The Global Atmospheric Circulation of Saturn

2018 ◽  
pp. 295-336 ◽  
Author(s):  
Adam P. Showman ◽  
Andrew P. Ingersoll ◽  
Richard Achterberg ◽  
Yohai Kaspi
Keyword(s):  
Atmospheric Circulation ◽  
Global Atmospheric Circulation

scholarly journals Response of a global atmospheric circulation model to spatio-temporal stochastic forcing: ensemble statistics

2003 ◽  
Vol 10 (6) ◽  
pp. 453-461 ◽  
Author(s):  
V. Pérez-Muñuzuri ◽  
M. N. Lorenzo ◽  
P. Montero ◽  
K. Fraedrich ◽  
E. Kirk ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Circulation Model ◽  
Ensemble Forecast ◽  
Forecast Evaluation ◽  
Correlated Noise ◽  
Stochastic Forcing ◽  
Statistical Measures ◽  
Ensemble Statistics ◽  
Spatio Temporal ◽  
Global Atmospheric Circulation

Abstract. The response of a simplified global atmospheric circulation model (PUMA) to spatiotemporal stochastic forcing is analyzed using the statistical measures originally developed for ensemble forecast evaluation. The nontrivial effects of time and length correlations of the stochastic forcing on the ensemble scores (e.g. spread and 'error') are studied. A maximum for these scores is observed to occur for specific values of the correlation time. The effects of multiplicative and additive contributions of the correlated noise are analyzed in terms of the noise and PUMA parameters.

scholarly journals Interdecadal Variations in the Walker Circulation and Its Connection to Inhomogeneous Air Temperature Changes from 1961–2012

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 469 ◽  
Author(s):  
Xiaoya Hou ◽  
Jianbo Cheng ◽  
Shujuan Hu ◽  
Guolin Feng
Keyword(s):  
Pacific Ocean ◽  
Atmospheric Circulation ◽  
Air Temperature ◽  
Walker Circulation ◽  
Tropical Indian Ocean ◽  
Eastern Pacific ◽  
Eastern Pacific Ocean ◽  
Temperature Changes ◽  
Pattern Decomposition ◽  
Global Atmospheric Circulation

The tropical Pacific Walker circulation (PWC) is fundamentally important to global atmospheric circulation, and changes in it have a vital influence on the weather and climate systems. A novel three-pattern decomposition of a global atmospheric circulation (3P-DGAC) method, which can be used to investigate atmospheric circulations including the PWC, was proposed in our previous study. Therefore, the present study aims to examine the capability of this 3P-DGAC method to acquire interdecadal variations in the PWC and its connection to inhomogeneous air temperature changes in the period from 1961–2012. Our findings reveal that interdecadal variations in the PWC, i.e., weakening (strengthening) between the periods 1961–1974 and 1979–1997 (1979–1997 and 1999–2012), can be observed using the zonal stream function (ZSF) derived from the 3P-DGAC method. Enhancement of the PWC is also associated with the strengthening and weakening of zonal circulations in the tropical Indian Ocean (IOC) and Atlantic (AOC), respectively, and vice versa, implying a connection between these zonal overturning circulations in the tropics. The interdecadal variations in the zonal circulations correspond well to inhomogeneous air temperature changes, i.e., an enhancement of the PWC is associated with a warming (cooling) of the air temperature from 1000 to 300 hPa in the western (mid–eastern) Pacific Ocean and a cooling (warming) of the air temperature in the tropopause in the western (mid–eastern) Pacific Ocean. Furthermore, a novel index for the PWC intensity based on air temperature is defined, and the capability of the novel index in representing the PWC intensity is evaluated. This novel index is potentially important for the prediction of the PWC by using dynamic equations derived from the 3P-DGAC method.

scholarly journals Atmospheric scattering of energetic electrons from near-Earth space

2021 ◽  
Author(s):  
Vassilis Angelopoulos ◽  
Ethan Tsai ◽  
Colin Wilkins ◽  
Xiaojia Zhang ◽  
Anton Artemyev ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Radiation Belt ◽  
Upper Atmosphere ◽  
Relativistic Electrons ◽  
Secondary Electrons ◽  
Energetic Electrons ◽  
Earth Space ◽  
Atmospheric Scattering ◽  
Near Earth Space ◽  
Global Atmospheric Circulation

Abstract In near-Earth space, the magnetosphere, energetic electrons (tens to thousands of kiloelectron volts) orbit around Earth, forming the radiation belts. When scattered by magnetospheric processes, these electrons precipitate to the upper atmosphere, where they deplete ozone, a radiatively active gas, modifying global atmospheric circulation. Relativistic electrons (those above a few hundred kiloelectron volts), can reach the lowest altitudes and have the strongest effects on the upper atmosphere; their loss from the magnetosphere is also important for space weather. Previous models have only considered magnetospheric scattering and precipitation of energetic electrons; atmospheric scattering of such electrons has not been adequately considered, principally due to lack of observations. Here we report the first observations of this process. We find that atmospherically-scattered energetic (relativistic) electrons form a low-intensity, persistent “drizzle”, whose integrated energy flux is comparable to (greater than) that of the more intense but ephemeral precipitation by magnetospheric scattering. Thus, atmospheric scattering of energetic electrons is important for global atmospheric circulation, radiation belt flux evolution, and the repopulation of the magnetosphere with lower-energy, secondary electrons.

scholarly journals Impact of Solar Activity on Global Atmospheric Circulation Based on SD-WACCM-X Simulations from 2002 to 2019

Atmosphere ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1526
Author(s):  
Chen-Ke-Min Teng ◽  
Sheng-Yang Gu ◽  
Yusong Qin ◽  
Xiankang Dou
Keyword(s):  
Solar Activity ◽  
Atmospheric Circulation ◽  
Southern Oscillation ◽  
Upper Atmosphere ◽  
Lower Atmosphere ◽  
High Solar Activity ◽  
Low Latitude ◽  
Quasi Biennial Oscillation ◽  
Global Atmospheric Circulation ◽  
The Impact

In this study, a global atmospheric model, Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension (SD-WACCM-X), and the residual circulation principle were used to study the global atmospheric circulation from the lower to upper atmosphere (~500 km) from 2002 to 2019. Our analysis shows that the atmospheric circulation is clearly influenced by solar activity, especially in the upper atmosphere, which is mainly characterized by an enhanced atmospheric circulation in years with high solar activity. The atmospheric circulation in the upper atmosphere also exhibits an ~11 year period, and its variation is highly correlated with the temporal variation in the F10.7 solar index during the same time series, with a maximum correlation coefficient of up to more than 0.9. In the middle and lower atmosphere, the impact of solar activity on the atmospheric circulation is not as obvious as in the upper atmosphere due to some atmospheric activities such as the Quasi-Biennial Oscillation (QBO), El Niño–Southern Oscillation (ENSO), sudden stratospheric warming (SSW), volcanic forcing, and so on. By comparing the atmospheric circulation in different latitudinal regions between years with high and low solar activity, we found the atmospheric circulation in mid- and high-latitude regions is more affected by solar activity than in low-latitude and equatorial regions. In addition, clear seasonal variation in atmospheric circulation was detected in the global atmosphere, excluding the regions near 10−4 hPa and the lower atmosphere, which is mainly characterized by a flow from the summer hemisphere to the winter hemisphere. In the middle and low atmosphere, the atmospheric circulation shows a quasi-biennial oscillatory variation in the low-latitude and equatorial regions. This work provides a referable study of global atmospheric circulation and demonstrates the impacts of solar activity on global atmospheric circulation.

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