The response of the North Pacific Decadal Variability to strong tropical volcanic eruptions

2012 ◽  
Vol 39 (12) ◽  
pp. 2917-2936 ◽  
Author(s):  
Tao Wang ◽  
Odd Helge Otterå ◽  
Yongqi Gao ◽  
Huijun Wang
Keyword(s):  
North Pacific ◽  
Decadal Variability ◽  
Volcanic Eruptions ◽  
The North ◽  
Pacific Decadal Variability ◽  
The North Pacific

Pacific Decadal Variability: The Tropical Pacific Mode and the North Pacific Mode*

2003 ◽  
Vol 16 (8) ◽  
pp. 1101-1120 ◽  
Author(s):  
L. Wu ◽  
Z. Liu ◽  
R. Gallimore ◽  
R. Jacob ◽  
D. Lee ◽  
...  
Keyword(s):  
North Pacific ◽  
Decadal Variability ◽  
Tropical Pacific ◽  
The North ◽  
Pacific Decadal Variability ◽  
The North Pacific ◽  
The Tropical Pacific

scholarly journals Implications of Both Statistical Equilibrium and Global Warming Simulations with CCSM3. Part I: On the Decadal Variability in the North Pacific Basin

2009 ◽  
Vol 22 (20) ◽  
pp. 5277-5297 ◽  
Author(s):  
Marc d’Orgeville ◽  
W. Richard Peltier
Keyword(s):  
Global Warming ◽  
North Pacific ◽  
Time Scale ◽  
Decadal Variability ◽  
Sea Surface ◽  
The North ◽  
Sst Variability ◽  
Pacific Decadal Variability ◽  
The North Pacific ◽  
North Pacific Basin

Abstract In the low-resolution version of the Community Climate System Model, version 3 (CCSM3), the modeled North Pacific decadal variability is demonstrated to be independent of the epoch for which a statistically steady control simulation is constructed, either preindustrial or modern; however, it is demonstrated to be significantly affected by the different global warming scenarios investigated. In the control simulations, the North Pacific basin is shown to be dominated by sea surface temperature (SST) variability with a time scale of approximately 20 yr. This mode of variability is in close accord with the observed characteristics of the Pacific decadal oscillation (PDO). A detailed analysis of the statistical equilibrium runs is performed based on other model variables as well [sea surface salinity (SSS), barotropic circulation, freshwater and heat fluxes, wind stress curl, sea ice, and snow coverage]. These analyses confirm that the underlying mechanism of the PDO involves a basin-scale mode of ocean adjustment to changes of the atmospheric forcing associated with the Aleutian low pressure system. However, they also suggest that the observed sign reversal of the PDO arises from a feedback in the northern part of the basin. In this novel hypothesis, the advection to the Bering Sea of “spice” anomalies formed in the central and western Pacific sets up a typical 10-yr time scale for the triggering of the PDO reversal. In all of the global warming simulations described in this paper, the signal represented by the detrended SST variability in the North Pacific displays significant power at multidecadal frequencies. In these simulations, the natural North Pacific decadal variability, as characterized in the control simulations (the PDO), remains the leading mode of variability only for moderate forcing. If the warming is too strong, then the typical 20-yr time scale of the canonical PDO can no longer be detected, except in terms of SSS variability and only prior to a significant change that occurs in the Bering Strait Throughflow.

scholarly journals Influence of ENSO on Pacific Decadal Variability: An Analysis Based on the NCEP Climate Forecast System

2012 ◽  
Vol 25 (18) ◽  
pp. 6136-6151 ◽  
Author(s):  
Hui Wang ◽  
Arun Kumar ◽  
Wanqiu Wang ◽  
Yan Xue
Keyword(s):  
North Pacific ◽  
Time Scale ◽  
Decadal Variability ◽  
Interannual Time Scale ◽  
Forecast System ◽  
Climate Forecast System ◽  
Decadal Time Scale ◽  
The North ◽  
Pacific Decadal Variability ◽  
The North Pacific

Abstract The influence of El Niño–Southern Oscillation (ENSO) on Pacific decadal variability (PDV) is investigated by comparing two 500-yr simulations with the National Centers for Environmental Prediction (NCEP) Climate Forecast System coupled model. One simulation is a no-ENSO run, in which model daily sea surface temperature (SST) in the tropical Pacific Ocean is relaxed to the observed climatology. The other simulation is a fully coupled run and retains ENSO variability. The PDV considered in this study is the first two empirical orthogonal functions of monthly SST anomalies in the North Pacific: the Pacific decadal oscillation (PDO) and the North Pacific Gyre Oscillation (NPGO). The PDO in the no-ENSO run can be clearly identified. Without ENSO, the PDO displays relatively higher variance at the decadal time scale and no spectral peak at the interannual time scale. In the ENSO run, the PDO variability increases slightly. ENSO not only enhances the variability of the PDO at the interannual time scale, but also shifts the PDO to longer time scales—both consistent with observations. ENSO modulates the Aleutian low and associated surface wind over the North Pacific. The latter, in turn, helps establish a more persistent PDO in the ENSO run. The results also indicate a PDO modulation of global ENSO impacts and the linearity in the superposition of the ENSO-forced and PDO-related atmospheric anomalies. Compared to observations, the NPGO in both simulations lacks power at the time scale longer than 30 yr. On the decadal time scale, the variability of the NPGO is weaker in the ENSO run than in the no-ENSO run.

scholarly journals Interannual-decadal variability of wintertime mixed layer depths in the North Pacific detected by an ensemble of ocean syntheses

2015 ◽  
Vol 49 (3) ◽  
pp. 891-907 ◽  
Author(s):  
Takahiro Toyoda ◽  
Yosuke Fujii ◽  
Tsurane Kuragano ◽  
Naohiro Kosugi ◽  
Daisuke Sasano ◽  
...  
Keyword(s):  
Mixed Layer ◽  
North Pacific ◽  
Decadal Variability ◽  
The North ◽  
The North Pacific

scholarly journals Decadal variability of the North Pacific Polar Front: Subsurface warming versus surface cooling

2002 ◽  
Vol 29 (9) ◽  
pp. 65-1-65-4 ◽  
Author(s):  
Igor Belkin ◽  
Richard Krishfield ◽  
Susumu Honjo
Keyword(s):  
North Pacific ◽  
Decadal Variability ◽  
Polar Front ◽  
Surface Cooling ◽  
The North ◽  
The North Pacific

scholarly journals Trends and Variability of North Pacific Polar Lows

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Fei Chen ◽  
Hans von Storch
Keyword(s):  
Spatial Distribution ◽  
North Pacific ◽  
Canonical Correlation ◽  
Decadal Variability ◽  
Observational Evidence ◽  
Positive Trend ◽  
Mean Flow ◽  
Polar Lows ◽  
The North ◽  
The North Pacific

The 6-hourly 1948–2010 NCEP 1 reanalyses have been dynamically downscaled for the region of the North Pacific. With a detecting-and-tracking algorithm, the climatology of North Pacific Polar Lows has been constructed. This derived climatology is consistent with the limited observational evidence in terms of frequency and spatial distribution. The climatology exhibits strong year-to-year variability but weak decadal variability and a small positive trend. A canonical correlation analysis describes the conditioning of the formation of Polar Lows by characteristic seasonal mean flow regimes, which favor, or limit, cold air outbreaks and upper air troughs.

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