Diverse impacts of the Siberian high on surface air temperature in Northeast China during boreal winter

2019 ◽  
Vol 40 (1) ◽  
pp. 594-603 ◽  
Author(s):  
Boqi Liu ◽  
Congwen Zhu
Keyword(s):  
Air Temperature ◽  
Northeast China ◽  
Surface Air Temperature ◽  
Boreal Winter ◽  
Siberian High

Influence of the boreal spring Southern Annular Mode on summer surface air temperature over northeast China

2014 ◽  
Vol 16 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Fei Zheng ◽  
Jianping Li ◽  
Robin T. Clark ◽  
Ruiqing Ding ◽  
Fei Li ◽  
...  
Keyword(s):  
Air Temperature ◽  
Northeast China ◽  
Surface Air Temperature ◽  
Southern Annular Mode ◽  
Annular Mode ◽  
Boreal Spring

scholarly journals The Impact of Tropical Indian Ocean Variability on Summer Surface Air Temperature in China

2011 ◽  
Vol 24 (20) ◽  
pp. 5365-5377 ◽  
Author(s):  
Kaiming Hu ◽  
Gang Huang ◽  
Ronghui Huang
Keyword(s):  
Indian Ocean ◽  
Air Temperature ◽  
South China ◽  
Northeast China ◽  
Surface Air Temperature ◽  
Vertical Motion ◽  
Tropical Indian Ocean ◽  
Ocean Basin ◽  
Sst Anomalies ◽  
Anomalous Cyclone

Abstract Evidence is presented that the boreal summer surface air temperature over south China and northeast China is remotely influenced by the Indian Ocean Basin mode (IOBM) sea surface temperature (SST) anomalies. Above-normal temperature in south China and below-normal temperature in northeast China correspond to a simultaneous Indian Ocean Basin warming. The teleconnection from Indian Ocean SST anomalies to China summer surface air temperature is investigated using observations and an atmospheric general circulation model (AGCM). The results herein indicate that the tropical Indian Ocean Basin warming can trigger a low-level anomalous anticyclone circulation in the subtropical northwest Pacific and an anomalous cyclone circulation in midlatitude East Asia through emanating a baroclinic Kelvin wave. In south China, the reduced rainfall and downward vertical motion associated with the anomalous low-level anticyclone circulation lead to above-normal summer surface air temperature. In northeast China, by contrast, upward vertical motion associated with the anomalous cyclone leads to below-normal summer surface air temperature.

Changes in the characteristics of North Pacific Jet as a Conduit for U. S. surface air temperature in boreal winter across the late 1990s

2021 ◽  
pp. 1-43
Author(s):  
Se-Yong Song ◽  
Sang-Wook Yeh ◽  
Hyun-Su Jo
Keyword(s):  
Air Temperature ◽  
North Pacific ◽  
Surface Air Temperature ◽  
The United States ◽  
Cyclonic Circulation ◽  
Boreal Winter ◽  
The North ◽  
Anomalous Surface ◽  
Intensity Changes ◽  
The North Pacific

AbstractThe leading modes of the North Pacific Jet (NPJ) variability include intensity changes and meridional shifts in jet position on the low frequency timescales. These leading modes of NPJ variability are closely associated with weather and climate conditions spanning from Asia to the United States (US). In this study, we investigated changes in the NPJ’s role as a conduit for US surface air temperature (SAT) anomalies during the boreal winter across the late 1990s. We found that the leading mode of NPJ variability changed from the NPJ intensity changes to meridional shifts in NPJ position across the late 1990s. It leads to the change in the role of NPJ as a conduit for US SAT anomalies. Before the late 1990s, the variability of NPJ’s intensity significantly impacted western US SAT anomalies related to the anomalous surface cyclonic circulation over the North Pacific. After the late 1990s, however, the variability of NPJ’s meridional shift significantly influenced on the eastern US SAT anomalies in association with the anomalous surface cyclonic circulation over the northern North Pacific. Further analysis and model experiments revealed that the western to central North Pacific Ocean has been warming since the late 1990s and modulates atmospheric baroclinicity. This phenomenon mainly leads to a northward NPJ shift and implies that the eddy driven mechanism on the NPJ’s formation, which acts to enhance the meridional variability of NPJ position, becomes dominant. We conclude that this northward shift of NPJ could have contributed to enhancing the NPJ’s meridional shift variability, significantly influencing the eastern US SAT anomalies since the late 1990s.

Mechanisms of Arctic Surface Air Temperature Change in Response to the Madden–Julian Oscillation

2012 ◽  
Vol 25 (17) ◽  
pp. 5777-5790 ◽  
Author(s):  
Changhyun Yoo ◽  
Sukyoung Lee ◽  
Steven B. Feldstein
Keyword(s):  
Heat Flux ◽  
Air Temperature ◽  
Phase 1 ◽  
Surface Air Temperature ◽  
The Arctic ◽  
Boreal Winter ◽  
Convective Heating ◽  
Madden Julian Oscillation ◽  
Eddy Heat Flux ◽  
Arctic Surface

Abstract Using lagged composites and projections with the thermodynamic energy equation, in this study the mechanisms that drive the boreal winter Arctic surface air temperature (SAT) change associated with the Madden–Julian oscillation (MJO) are investigated. The Wheeler and Hendon MJO index, which divides the MJO into 8 phases, where phase 1 (phase 5) corresponds to reduced (enhanced) convection over the Maritime Continent and western Pacific Ocean, is used. It is shown that the more zonally localized (uniform) tropical convective heating associated with MJO phase 5 (phase 1) leads to enhanced (reduced) excitation of poleward-propagating Rossby waves, which contribute to Arctic warming (cooling). Adiabatic warming/cooling, eddy heat flux, and the subsequent change in downward infrared radiation (IR) flux are found to be important for the Arctic SAT change. The adiabatic warming/cooling initiates the Arctic SAT change, however, subsequent eddy heat flux makes a greater contribution. The resulting SAT change is further amplified by alteration in downward IR. It is shown that changes in surface sensible and latent heat fluxes oppose the contribution by the above processes.

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