scholarly journals Eastward salinity anomaly propagation in the intermediate layer of the North Pacific

2017 ◽  
Vol 122 (2) ◽  
pp. 1590-1607 ◽  
Author(s):  
Shinya Kouketsu ◽  
Satoshi Osafune ◽  
Yuichiro Kumamoto ◽  
Hiroshi Uchida
Keyword(s):  
North Pacific ◽  
Intermediate Layer ◽  
The North ◽  
Salinity Anomaly ◽  
The North Pacific

scholarly journals Temperature and salinity extremes from 2014-2019 in the California Current System and its source waters

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Alice S. Ren ◽  
Daniel L. Rudnick
Keyword(s):  
High Temperatures ◽  
North Pacific ◽  
Current System ◽  
California Current ◽  
Near Surface ◽  
California Current System ◽  
The North ◽  
Salinity Anomaly ◽  
The North Pacific ◽  
Source Waters

AbstractThe California Current System in the eastern North Pacific Ocean has experienced record high temperatures since the marine heatwave of 2014-2016. Here we show, through a compilation of data from shipboard hydrography, ocean gliders, and the Argo floats, that a high-salinity anomaly affected the California Current System from 2017-2019 in addition to the anomalously high temperatures. The salinity anomaly formed in 2015 in the North Pacific Subtropical Gyre and was subsequently advected into the California Current System, in a generation mechanism different from the events leading to the marine heatwaves of 2013/2014 and 2019 in the North Pacific. The salinity anomaly was unique in at least 16 years with an annual mean deviation from the long-term average greater than 0.2 and anomalies greater than 0.7 observed offshore. Our results imply that different source waters were found in the California Current from 2017-2019, with the near-surface California Current salinity rivaling that of the California Undercurrent.

scholarly journals Overturning circulation that ventilates the intermediate layer of the Sea of Okhotsk and the North Pacific: The role of salinity advection

2015 ◽  
Vol 120 (3) ◽  
pp. 1462-1489 ◽  
Author(s):  
Junji Matsuda ◽  
Humio Mitsudera ◽  
Tomohiro Nakamura ◽  
Yuichiro Sasajima ◽  
Hiroyasu Hasumi ◽  
...  
Keyword(s):  
North Pacific ◽  
Intermediate Layer ◽  
Sea Of Okhotsk ◽  
Overturning Circulation ◽  
The Sea Of Okhotsk ◽  
The North ◽  
The North Pacific

Transport of the Cs-134 activity derived from Fukushima Dai-ichi Nuclear Power Plant in the North Pacific Ocean

2020 ◽  
Author(s):  
Takaki Tsubono ◽  
Kazuhiro Misumi ◽  
Daisuke Tsumune ◽  
Michio Aoyama ◽  
Katsumi Hirose
Keyword(s):  
Surface Layer ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
North Pacific ◽  
Intermediate Layer ◽  
Nuclear Power ◽  
North Pacific Ocean ◽  
Abundance Ratio ◽  
The North ◽  
The North Pacific

<p>We conducted the ensemble simulation of Cs-134 activity in the North Pacific Ocean (NPO) water after the Fukushima Dai-ichi Nuclear Power Plant (1F NPP) by setting four different passive tracers corresponding to the fluxes of the Cs-134 activity; 1. Cs_DD for Cs-134 activity directly discharged from the coast of the 1F NPP (Tsumune et al., 2013), 2. Cs_ADN for the activity derived from the atmospheric deposition (Aoyama et al, 2015) northern from 36°N, 3. Cs_ADKE for that in the Kuroshio Extension area from 32°N or 36°N, 4. Cs_ADS for that southern from 32°N. The totals of the Cs_DD, Cs_ADN, Cs_ADKE and Cs_ADS in the NPO in May 2011 are 5.6, 8.7, 1.0 and 0.6 PBq respectively, suggesting that the impact was dominant northern from 36°N in the NPO. The sum of four tracers showed comparable to the Cs-134 activity from all the fluxes in previous study with the correlation coefficient of 0.99 and the RMS of 5 Bq m$^{-3}$ in 2011 and 0.99 and 0.1 Bq m$^{-3}$ in 2012, except for the area of Japanese coast near the 1F NPP in which the rapid increase in the direct discharge flux produced the different negative values due to the dispersive error of the difference scheme. Since the Cs-134 activity diminishes in time due to the short half life of about 2 years, the abundance ratio was calculated for the investment of the meridional and vertical transport. The abundance ratio of the whole Cs-134 activities showed that although almost all the Cs-134 activity existed in the surface layer above 200m depth after the accident, the ratio in the intermediate layer from 200m to 600m depth increased and exceeded 50 percent since 2017. Moreover the ratio in the intermediate layer southern from 32°N exceeded the 25 percent since 2017, suggesting that more than 25 percent of the Cs-134 activity in the surface layer northern to the 36°N in early period after the accident were transported to the southern and deep in 2017. While the abundance ratio of Cs_DD and Cs_ADN in the intermediate layer showed an increase like a logarithmic function shape, the ratio of the Cs_DD, 60 percent, was larger than that of the Cs_ADN, 50 percent, in 2021. Moreover, the abundance ratio in 2011 showed the 70 percent of Cs_DD and Cs_ADN existed in the intermediate layer southern to the 32 °N, suggesting a large amount of both the Cs_DD and Cs_ADN were transported southern and deep in 2021.</p>

Intra-seasonal and inter-annual patterns in the demographics of sand lance and response to environmental drivers in the North Pacific

2019 ◽  
Vol 617-618 ◽  
pp. 221-244 ◽  
Author(s):  
MR Baker ◽  
ME Matta ◽  
M Beaulieu ◽  
N Paris ◽  
S Huber ◽  
...  
Keyword(s):  
North Pacific ◽  
Environmental Drivers ◽  
Sand Lance ◽  
The North ◽  
The North Pacific ◽  
Annual Patterns
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