Preformed Cd and PO4 and the relationship between the two elements in the northwestern Pacific and the Okhotsk Sea

2002 ◽  
Vol 79 (1) ◽  
pp. 27-36 ◽  
Author(s):  
Kazuo Abe
Keyword(s):  
Northwestern Pacific ◽  
Okhotsk Sea ◽  
The Relationship

scholarly journals Secondary Microseisms generated by typhoons in the Northwestern Pacific Ocean

2021 ◽  
Author(s):  
Nassima Benbelkacem ◽  
Eléonore Stutzmann ◽  
Martin Schimmel ◽  
Véronique Farra ◽  
Fabrice Ardhuin ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Body Wave ◽  
Ocean Waves ◽  
Body Waves ◽  
Northwestern Pacific ◽  
Northwestern Pacific Ocean ◽  
Wave Reflections ◽  
Source Characteristics ◽  
Beamforming Technique ◽  
The Relationship

<p>Secondary Microseisms (SM) are recorded by seismometers in the period band 3-10 s. They are generated by the interaction of ocean gravity waves of similar frequencies and coming from nearly opposite directions. Typhoons create such ocean waves, and the purpose of this study is to investigate the relationship between typhoons and microseism source characteristics. We focused our study on the Northwestern Pacific and we analyzed seismic signals recorded by the Alaska array and the corresponding storm catalog. While P body waves enable to characterize the amplitude and the localization of the sources, secondary microseisms are dominated by surface waves. Therefore, we apply beamforming technique to the vertical components in order to highlight the weaker body wave signals. This analysis permits us to track the localization of SM sources every 6 hours. Our results show three cases: In the case of one active typhoon, the positions of SM sources are localized close to the typhoon position. In the case of two nearby typhoons acting simultaneously, the SM sources are localized in between the typhoons. Finally, when the typhoon arrives close to the coast, we observe sources generated by ocean wave reflections. In conclusion, the three mechanisms proposed by Ardhuin et al., (2011) are necessary to explain secondary microseisms generated by typhoons.</p>

scholarly journals Meandering Subtropical Jet and Precipitation over Summertime East Asia and the Northwestern Pacific

2017 ◽  
Vol 74 (4) ◽  
pp. 1233-1247 ◽  
Author(s):  
Takeshi Horinouchi ◽  
Ayumu Hayashi
Keyword(s):  
Coastal Region ◽  
Northwestern Pacific ◽  
The West ◽  
Subtropical Jet ◽  
Low Level Jets ◽  
Upper Level ◽  
Quasigeostrophic Model ◽  
The Relationship ◽  
Q Vector ◽  
Precipitation Enhancement

Abstract It has been revealed that in summertime, precipitation is enhanced to the south of the upper-level tropopausal potential vorticity contours, which are accompanied by instantaneous jets, over the eastern coastal region of China to the northwestern Pacific. It is frequently exhibited as precipitation bands ranging in size from over a thousand to several thousands of kilometers long. In this study, an analysis was conducted to quantify the relationship depending on the phase of upper-level disturbances. With composite analysis, it is shown that the enhancement along the contours occurs at all phases; it occurs not only to the east but also to the west of the upper-level troughs, although it is weaker. The midtropospheric distributions of upwelling and the Q-vector convergence are collocated with the precipitation enhancement, suggesting the importance of dynamical induction by geostrophic flow at all phases. The effects of upper-level disturbances and low-level jets (LLJs) with a southerly component are investigated by using an idealized nondimensional quasigeostrophic model supporting latent heating. While upper-level waves induce upwelling and downwelling to the east and west, respectively, of the upper-level troughs, LLJs tend to offset the downwelling, enabling precipitation to the west too. Both in the observational composite and the idealized model with LLJ, confluence and diffluence contribute to the Q-vector convergence to induce upwelling along the subtropical jet irrespective of upper-level disturbance phases. This induction is explained as a general feature of a veered jet where geopotential isolines rotate clockwise with height without requiring wind variation along the jet.

scholarly journals Remembering the Gulag in post-Soviet Magadan

2013 ◽  
Vol 3 (2) ◽  
Author(s):  
Norman Prell
Keyword(s):  
Northeastern Russia ◽  
Okhotsk Sea ◽  
Industrial Areas ◽  
Gold Mines ◽  
Adverse Conditions ◽  
Historical Landscape ◽  
Populated Region ◽  
The Relationship ◽  
The City ◽  
Kolyma River

This essay explores the relationship between place and memory in the former Gulag periphery of Magadan in northeastern Russia. Located on the coast of the Okhotsk Sea, the city of Magadan emerged as a gateway to the sparsely populated region after the discovery of gold in the late 1920s. Today, a huge monument, the Mask of Sorrow, raised upon a hill on the margin of the city, commemorates the hundreds of thousands of prison- ers who were shipped to Magadan during the dictatorship of Stalin to work in the region’s newly established gold mines. Crucial to the region’s development was the construction of the legendary Kolyma Road between the port of Magadan and the industrial areas at the up- per Kolyma River. Built by prisoners under the most adverse conditions, this road is often referred to as ‘Road of Bones’. This essay demonstrates how the Mask of Sorrow and the Kolyma Road, during particular commemorative events, participate in the enactment of a historical landscape that bears the potential for a ritual return of the victims of the Gulag.

scholarly journals Interdecadal Changes in the Relationship between ENSO, EAWM, and the Wintertime Precipitation over China at the End of the Twentieth Century

2017 ◽  
Vol 30 (6) ◽  
pp. 1923-1937 ◽  
Author(s):  
Xiaojing Jia ◽  
Jingwen Ge
Keyword(s):  
Twentieth Century ◽  
Southern Oscillation ◽  
Winter Precipitation ◽  
Interdecadal Change ◽  
Northwestern Pacific ◽  
Southeastern China ◽  
Precipitation Anomalies ◽  
The Impact ◽  
The Relationship ◽  
Interdecadal Changes

Abstract The current study investigates the interdecadal changes in the relationship between the winter precipitation anomalies in southeastern China, El Niño–Southern Oscillation (ENSO), and the East Asian winter monsoon (EAWM) at the end of the twentieth century. It appears that the relationships between the interannual variability of the southeastern China winter precipitation and ENSO as well as EAWM are obviously weakened after 1998/99. The possible mechanisms accounting for this interdecadal change in the relationship have been examined by dividing the data into two subperiods [1980–98 (P1) and 1999–2015 (P2)]. The results indicate that, without the linear contribution of EAWM, ENSO only play a limited role in the variability of winter precipitation in southeastern China in both subperiods. In contrast, in P1, corresponding to an ENSO-independent weaker-than-normal EAWM, anomalous southerlies along coastal southeastern China associated with an anticyclone over the northwestern Pacific transport water vapor to China. However, in P2 the impact of EAWM on winter precipitation in southeastern China is weakened because of the regime shift of EAWM. The EAWM-related positive SLP anomalies over the North Pacific move eastward in P2, causing an eastward migration of the associated anomalous southerlies along its western flank and therefore cannot significantly contribute to the positive winter precipitation anomalies in southeastern China.

The Nature of Intrinsic Attenuation

2020 ◽  
Author(s):  
Yu-Chang Wu ◽  
Cheng-Ju Wu
Keyword(s):  
Seismic Waves ◽  
Body Waves ◽  
Northwestern Pacific ◽  
The Novel ◽  
Low Velocity ◽  
High Attenuation ◽  
Intrinsic Attenuation ◽  
Novel Method ◽  
The Difference ◽  
The Relationship

<p>Intrinsic attenuation plays an important role in investigating the interior structure of Earth, especially for the Lithosphere-asthenosphere system, the best place to understand the physical mechanics of plate tectonic. The dissipation, the high attenuation of seismic waves in the low-velocity zones, and the frequency dependence are the characteristic of intrinsic attenuation. However, N. Takeuchi, et al. measured the Northwestern Pacific Ocean’s lithosphere-asthenosphere system, and state the attenuation of the asthenosphere is 50 times larger than the attenuation of lithosphere attenuation. The attenuation of the lithosphere shows strong frequency dependency, but the attenuation of the asthenosphere does not. Previous theories of attenuation failed to explain this phenomenon. Here we demonstrate an explicit attenuation formulation to explain the high attenuation of seismic waves in the low-velocity zones and to show the mechanisms of spectral of teleseismic body waves rapidly fall off as frequency bigger than 1 Hz by perturbing the wave equation with the novel method we proposed. The result also indicates that the difference between the attenuation of the lithosphere and asthenosphere is because their attenuation governs by different physics mechanisms and mathematical models. Moreover, we illustrate the explicit formulation of the relationship between apparent t*, wave velocity, and frequency.</p>

scholarly journals Distinct Modes of the East Asian Summer Monsoon*

2008 ◽  
Vol 21 (5) ◽  
pp. 1122-1138 ◽  
Author(s):  
Bingyi Wu ◽  
Renhe Zhang ◽  
Yihui Ding ◽  
Rosanne D’Arrigo
Keyword(s):  
Heat Source ◽  
Convective Heat ◽  
Summer Monsoon ◽  
East Asian Summer Monsoon ◽  
Asian Summer Monsoon ◽  
East Asian ◽  
Northwestern Pacific ◽  
Okhotsk Sea ◽  
Southeastern China ◽  
Asian Summer

Abstract Resolution of a complex Hermitian matrix derived from monthly mean 850-hPa wind fields during the summer season (June–August) from 1968 to 2004 revealed four different modes of East Asian summer monsoon (EASM) variability. The leading EASM mode, accounting for 19.6% of the variance, is characterized by two different modes (M11 and M12) or their combination. Both portray a closed cyclonic or anticyclonic circulation anomaly over the western North Pacific (WNP), South China Sea (SCS), and southeastern China; corresponding anomalous geopotential height fields show a wave train structure from the WNP across Japan, the Okhotsk Sea, and Alaska to North America. Thus, the leading EASM mode characterizes the teleconnection pattern of the WNP-EASM. The correlation between M11 (M12) and the dynamic index for the WNP-EASM is 0.85 (0.51). M11 has leading spectral peaks at 15 and 3 yr, whereas M12 displays a predominant peak at 2 yr. It is found that M11 has interdecadal variations, with the transition years being circa 1973 and 1989, respectively. M11 is closely related to air–sea interactions in the SCS and the northwestern Pacific, and its association with the convective heat source over the northwestern Pacific is secondary. In contrast, M12 is closely related to the tropical convective heat source rather than tropical western Pacific sea surface temperature (SST). The second EASM mode, accounting for 12.8% of the variance, is identified and characterized by two distinct and alternating modes or their linear combination (M21 and M22). One mode (M21) closely relates to the dual blocking high pattern detected in anomalous sea level pressure (SLP) and 500-hPa geopotential heights over the Ural Mountains and the Okhotsk Sea. The other (M22) corresponds to a dipole blocking anomaly in anomalous SLP and geopotential heights, with opposing anomalous centers in the south of Japan and the Korean peninsula, and the area between Lake Baikal and the Okhotsk Sea. M22 shows significant correlations with summer mean rainfall in southern and southeastern China. Thus, a single index of EASM is inappropriate for investigating and predicting the EASM.

Simulated Pathways of the Northwestern Pacific Water in the Okhotsk Sea

2021 ◽  
Vol 57 (3) ◽  
pp. 329-340
Author(s):  
P. A. Fayman ◽  
S. V. Prants ◽  
M. V. Budyansky ◽  
M. Yu. Uleysky
Keyword(s):  
Northwestern Pacific ◽  
Okhotsk Sea ◽  
Pacific Water

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

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