scholarly journals Uncertainty in future projections of the North Pacific subtropical high and its implication for California winter precipitation change

2016 ◽  
Vol 121 (2) ◽  
pp. 795-806 ◽  
Author(s):  
Jung Choi ◽  
Jian Lu ◽  
Seok-Woo Son ◽  
Dargan M. W. Frierson ◽  
Jin-Ho Yoon
Keyword(s):  
North Pacific ◽  
Winter Precipitation ◽  
Precipitation Change ◽  
Subtropical High ◽  
Future Projections ◽  
The North ◽  
The North Pacific

scholarly journals Contrastive Influence of ENSO and PNA on Variability and Predictability of North American Winter Precipitation

2019 ◽  
Vol 32 (19) ◽  
pp. 6271-6284 ◽  
Author(s):  
Xiaofan Li ◽  
Zeng-Zhen Hu ◽  
Ping Liang ◽  
Jieshun Zhu
Keyword(s):  
North America ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
North American ◽  
North Pacific ◽  
Winter Precipitation ◽  
Sea Surface ◽  
The North ◽  
Remote Forcing ◽  
The North Pacific

Abstract In this work, the roles of El Niño–Southern Oscillation (ENSO) in the variability and predictability of the Pacific–North American (PNA) pattern and precipitation in North America in winter are examined. It is noted that statistically about 29% of the variance of PNA is linearly linked to ENSO, while the remaining 71% of the variance of PNA might be explained by other processes, including atmospheric internal dynamics and sea surface temperature variations in the North Pacific. The ENSO impact is mainly meridional from the tropics to the mid–high latitudes, while a major fraction of the non-ENSO variability associated with PNA is confined in the zonal direction from the North Pacific to the North American continent. Such interferential connection on PNA as well as on North American climate variability may reflect a competition between local internal dynamical processes (unpredictable fraction) and remote forcing (predictable fraction). Model responses to observed sea surface temperature and model forecasts confirm that the remote forcing is mainly associated with ENSO and it is the major source of predictability of PNA and winter precipitation in North America.

Contributions of Asian pollution and SST forcings on precipitation change in the North Pacific

2017 ◽  
Vol 192 ◽  
pp. 30-37 ◽  
Author(s):  
Sang-Wook Yeh ◽  
Jihyeon So ◽  
Jong-Won Lee ◽  
Minjoong J. Kim ◽  
Jaein I. Jeong ◽  
...  
Keyword(s):  
North Pacific ◽  
Precipitation Change ◽  
The North ◽  
The North Pacific

scholarly journals The Influences of the Atlantic Multidecadal Oscillation on the Mean Strength of the North Pacific Subtropical High during Boreal Winter

2017 ◽  
Vol 30 (1) ◽  
pp. 411-426 ◽  
Author(s):  
Kewei Lyu ◽  
Jin-Yi Yu ◽  
Houk Paek
Keyword(s):  
Sea Level ◽  
North Pacific ◽  
Stationary Wave ◽  
Atlantic Multidecadal Oscillation ◽  
Wave Pattern ◽  
Subtropical High ◽  
Sea Level Pressure ◽  
The North ◽  
The Pacific ◽  
The North Pacific

The Atlantic multidecadal oscillation (AMO) has been shown to be capable of exerting significant influences on the Pacific climate. In this study, the authors analyze reanalysis datasets and conduct forced and coupled experiments with an atmospheric general circulation model (AGCM) to explain why the winter North Pacific subtropical high strengthens and expands northwestward during the positive phase of the AMO. The results show that the tropical Atlantic warming associated with the positive AMO phase leads to a westward displacement of the Pacific Walker circulation and a cooling of the tropical Pacific Ocean, thereby inducing anomalous descending motion over the central tropical Pacific. The descending motion then excites a stationary Rossby wave pattern that extends northward to produce a nearly barotropic anticyclone over the North Pacific. A diagnosis based on the quasigeostrophic vertical velocity equation reveals that the stationary wave pattern also results in enhanced subsidence over the northeastern Pacific via the anomalous advections of vorticity and temperature. The anomalous barotropic anticyclone and the enhanced subsidence are the two mechanisms that increase the sea level pressure over the North Pacific. The latter mechanism occurs to the southeast of the former one and thus is more influential in the subtropical high region. Both mechanisms can be produced in forced and coupled AGCMs but are displaced northward as a result of stationary wave patterns that differ from those observed. This explains why the model-simulated North Pacific sea level pressure responses to the AMO tend to be biased northward.

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