Do atmospheric teleconnection patterns explain variations and trends in thermal growing season parameters in Finland?

2015 ◽  
Vol 35 (15) ◽  
pp. 4619-4630 ◽  
Author(s):  
Masoud Irannezhad ◽  
Bjørn Kløve
Keyword(s):  
Growing Season ◽  
Atmospheric Teleconnection ◽  
Teleconnection Patterns ◽  
Atmospheric Teleconnection Patterns

scholarly journals The Wintertime Wind Stress Curl Field in the North Atlantic and Its Relation to Atmospheric Teleconnection Patterns

2010 ◽  
Vol 67 (5) ◽  
pp. 1687-1694 ◽  
Author(s):  
Shusaku Sugimoto ◽  
Kimio Hanawa
Keyword(s):  
Wind Stress ◽  
North Atlantic ◽  
Wind Stress Curl ◽  
Atlantic Sector ◽  
Atmospheric Teleconnection ◽  
Maximum Covariance Analysis ◽  
Teleconnection Patterns ◽  
The North ◽  
The North Atlantic ◽  
Atmospheric Teleconnection Patterns

Abstract Adopting a rotated empirical orthogonal function (REOF) analysis and a maximum covariance analysis (MCA), characteristics of the wintertime wind stress curl (WSC) anomaly field in the North Atlantic are investigated. In terms of both temporal variation and spatial distribution, the first four leading modes of WSC show a one-to-one relation with four atmospheric teleconnection patterns over the North Atlantic sector: the North Atlantic Oscillation (NAO) and the east Atlantic (EA), tropical–Northern Hemisphere (TNH), and Pacific–North American (PNA) patterns. These four patterns characterize the WSC variations over the different regions in the North Atlantic: NAO and EA over the eastern side of the basin, TNH over the central part of the basin, and PNA over the western side of the basin.

Classification of wintertime atmospheric teleconnection patterns in the Northern Hemisphere

2020 ◽  
pp. 1-40
Author(s):  
Minju Kim ◽  
Changhyun Yoo ◽  
Mi-Kyung Sung ◽  
Sukyoung Lee
Keyword(s):  
Potential Energy ◽  
Energy Conversion ◽  
Northern Hemisphere ◽  
Positive Contribution ◽  
Negative Contribution ◽  
Atmospheric Teleconnection ◽  
Teleconnection Patterns ◽  
Eddy Heat Flux ◽  
Eddy Field ◽  
Atmospheric Teleconnection Patterns

AbstractEnergetics of the major atmospheric teleconnection patterns of the Northern Hemisphere winter are examined to investigate the role of baroclinic and barotropic energy conversions in their growth. Based on characteristics of the energetics and the horizontal structures, the patterns are classified into three general types: meridional dipole (D-type), wave (W-type), and hybrid (H-type). The primary energy conversion term that differentiates these patterns is the baroclinic energy conversion of the available potential energy from the climatology to the eddy field associated with the teleconnections. For this conversion term, D-type patterns exhibit the comparable conversion of potential energy via the eddy heat flux across the climatological thermal gradient in both the zonal and meridional directions. In contrast, baroclinic conversion for W-type patterns occurs primarily in the meridional direction, while H-type patterns exhibit a structure that combines the characteristics of the other two pattern types. An important secondary factor is barotropic conversion from the climatology to the eddy field, which takes place mainly in the regions where the climatological shear is strong. For the D-type patterns, conversion occurs on the flank of the climatological jet exit, while it occurs at the center of the jet exit for the W-type patterns. Lastly, for all the patterns, synoptic time-scale eddies make a negative contribution via the baroclinic process, but a positive contribution via the barotropic process. Damping by diabatic heating weakens the temperature anomalies associated with the patterns.

Sign in / Sign up

Export Citation Format

Share Document