Interannual variability of the subtropical countercurrent eddies in the North Pacific associated with the Western-Pacific teleconnection pattern

2017 ◽  
Vol 143 ◽  
pp. 175-184 ◽  
Author(s):  
Chun Hoe Chow ◽  
Yu-heng Tseng ◽  
Huang-Hsiung Hsu ◽  
Chih-Chieh Young
Keyword(s):  
Interannual Variability ◽  
North Pacific ◽  
Teleconnection Pattern ◽  
Western Pacific ◽  
The North ◽  
Subtropical Countercurrent ◽  
The Western Pacific ◽  
The North Pacific

Recent intensified influence of the winter North Pacific sea surface temperature on the withdrawal date of Meiyu

2021 ◽  
pp. 1-53
Author(s):  
Hua Li ◽  
Shengping He ◽  
Ke Fan ◽  
Yong Liu ◽  
Xing Yuan
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Interannual Variability ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Sea Surface ◽  
The North ◽  
Time Period ◽  
The North Pacific ◽  
Sst Anomalies

AbstractThe Meiyu withdrawal date (MWD) is a crucial indicator of flood/drought conditions over East Asia. It is characterized by a strong interannual variability, but its underlying mechanism remains unknown. We investigated the possible effects of the winter sea surface temperature (SST) in the North Pacific Ocean on the MWD on interannual to interdecadal timescales. Both our observations and model results suggest that the winter SST anomalies associated with the MWD are mainly contributed by a combination of the first two leading modes of the winter SST in the North Pacific, which have a horseshoe shape (the NPSST). The statistical results indicate that the intimate linkage between the NPSST and the MWD has intensified since the early 1990s. During the time period 1990–2016, the NPSST-related SST anomalies persisted from winter to the following seasons and affected the SST over the tropical Pacific in July. Subsequently, the SST anomalies throughout the North Pacific strengthened the southward migration of the East Asian jet stream (EAJS) and the southward and westward replacement of the western North Pacific subtropical high (WPSH), leading to an increase in Meiyu rainfall from July 1 to 20. More convincingly, the anomalous EAJS and WPSH induced by the SST anomalies can be reproduced well by numerical simulations. By contrast, the influence of the NPSST on the EASJ and WPSH were not clear between 1961 and 1985. This study further illustrates that the enhanced interannual variability of the NPSST may be attributed to the more persistent SST anomalies during the time period 1990–2016.

scholarly journals Interannual Variability in Low Stratiform Cloud Amount over the Summertime North Pacific in Terms of Cloud Types

2017 ◽  
Vol 30 (16) ◽  
pp. 6107-6121 ◽  
Author(s):  
Tsuyoshi Koshiro ◽  
Seiji Yukimoto ◽  
Masato Shiotani
Keyword(s):  
Interannual Variability ◽  
North Pacific ◽  
Cloud Amount ◽  
Small Variation ◽  
Reanalysis Data ◽  
Teleconnection Pattern ◽  
Stratiform Cloud ◽  
The North ◽  
Inversion Strength ◽  
Capping Inversion

Using long-term (1958–2008) ship-based cloud observations and reanalysis data, interannual variability in the low stratiform cloud (LSC) amount of stratocumulus (Sc), stratus (St), and sky-obscuring fog (FOG) is examined over the summertime North Pacific. The correlation between the LSC amount and the estimated inversion strength is positive but relatively weak, compared with the well-known linear relationship for their seasonal variabilities. This reflects the regional contrast: the correlations are stronger in the southeastern North Pacific (SE NP) and weaker in the northwestern North Pacific (NW NP). Regarding the LSC types, variations in Sc amount are large over the SE NP and correlated with the inferred capping inversion strength. Variations in FOG amount are large over the NW NP and correlated with the inferred surface-based inversion strength. The compensating variations between the Sc and FOG amounts result in an apparent small variation in the total LSC amount in this region. Variations in St amount are small over the whole North Pacific. The increase in the Sc amount over the SE NP is linked to the local cold sea surface temperature (SST) anomalies with a positive feedback, whereas the increase in the FOG amount over the NW NP is related to warm moist advection across the SST front caused by the anticyclonic sea level pressure anomalies over the north-central North Pacific. The former is associated with an El Niño in the preceding winter and the latter with a wavelike teleconnection pattern along the summertime Asian jet.

Transoceanic migration rates of young North Pacific albacore, Thunnus alalunga, from conventional tagging data

2008 ◽  
Vol 65 (8) ◽  
pp. 1681-1691 ◽  
Author(s):  
Momoko Ichinokawa ◽  
Atilio L. Coan, ◽  
Yukio Takeuchi
Keyword(s):  
North Pacific ◽  
Seasonal Migration ◽  
Western Pacific ◽  
Migration Routes ◽  
Migration Rates ◽  
The North ◽  
Maximum Likelihood Methods ◽  
Westward Movement ◽  
Thunnus Alalunga ◽  
The North Pacific

This study summarizes US and Japanese historical North Pacific albacore ( Thunnus alalunga) tagging data and uses maximum likelihood methods to estimate seasonal migration rates of young North Pacific albacore. Previous studies related to North Pacific albacore migration have found that the frequency of albacore migrations is difficult to quantify because of inadequate amounts of tags released by the US tagging program in the western Pacific. Use of the combined Japan and US tagging data solves this problem. This study also incorporates specific seasonal migration routes, hypothesized in past qualitative analyses, to avoid overparameterization problems. The estimated migration patterns qualitatively correspond to those from previous studies and suggest the possibility of frequent westward movements and infrequent eastward movements in the North Pacific. This frequent westward movement of young albacore in the North Pacific would correspond to a part of albacore life history in which immature fish recruit into fisheries in the western and eastern Pacific and then gradually move near to their spawning grounds in the central and western Pacific before maturing.

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