共查询到20条相似文献，搜索用时 31 毫秒
1.
Yu. V. Artamonov M. V. Babii A. E. Bukatov E. A. Skripaleva 《Physical Oceanography》2008,18(4):194-203
By using the data array of satellite measurements of the sea-surface temperature (SST), it is shown that the distributions
of linear trends of the SST for 17 years (1986–2002) are closely correlated with the specific features of large-scale circulation
of waters. The extreme values of trends of the SST are observed in the zones of the Gulf Stream, East-Greenland, Labrador,
and North-Atlantic Currents, North Equatorial Countercurrent, South Equatorial and Antarctic Circumpolar Currents. The differences
between the distributions of trends of the SST for some months of the year are revealed. In the zones of currents transporting
warm surface waters from the tropical areas, positive trends of the SST are observed for the most part of the year. On the
contrary, negative trends are predominant in the zones of currents transporting cold upwelling waters.
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 32–42, July–August, 2008. 相似文献
2.
V. V. Knysh G. K. Korotaev S. G. Demyshev V. N. Belokopytov 《Physical Oceanography》2005,15(3):142-160
We compare the thermohaline and dynamic characteristics of the Black Sea reconstructed by using two versions of climatic temperature
and salinity fields:old (1903–1982)and new (1903–2003). The fields are reconstructed with the help of continuous assimilation
of the climatic temperature and salinity in the model. It is shown that the climatic thermohaline fields constructed with
regard for the data of observations for the last 20 yr are characterized by an insignificant elevation of the halocline (pycnocline)in
the winter-spring period and the elevation of the upper boundary of the cold intermediate layer in the spring-summer period.
The intensity of surface geostrophic currents is greater than the same quantity computed on the basis of the old climatic
data for the whole year. The horizontal currents in the sea computed according to the new climatic data are more intense.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 11–30, May–June, 2005. 相似文献
3.
本文通过分析RAMA印度洋观测浮标系统锚系ADCP实测资料,对赤道中印度洋上层海流季节变化进行了研究。研究结果表明,0°,80.5°E纬向流垂向剖面呈现上150m层一致的东向流,而经向流在100m以浅呈现表层向北次表层向南的翻转流结构。赤道中印度洋上层纬向流季节信号被半年周期的东向射流Wyrtki Jets(WJs)所控制。WJs发生于季风方向转换的季节,4—5月份较弱,10—11月份较强。赤道中印度洋上层经向流年周期信号显著。北半球夏季与冬季分别出现风应力旋度驱动的Sverdrup南向流与北向流。本文结论为赤道中印度洋上层环流季节变化特征的研究提供了观测角度的支持。 相似文献
4.
Yu. V. Artamonov 《Physical Oceanography》2006,16(3):177-187
The monthly average values of the anomalies of the ocean level (according to the satellite data for 1992–2002) and the annual
average dynamic heights (hydrological data) are used to compute the seasonal cycle of geostrophic currents on the surface
of the Atlantic Ocean. It is shown that the west and east currents are intensified with a phase difference of several months.
At the same time, their latitudinal displacements are quasisynchronous. A delay of the seasonal signal in the east-west direction
of about 2–3 months (on the average) is typical of currents in the tropical zone of the Northern Hemisphere. On the contrary,
in the South Atlantic, the seasonal signal propagates in the west-east direction and its phase delay can be as large as almost
six months.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 60–71, May–June, 2006. 相似文献
5.
Surface Velocity Program drifters drogued at 15 m depth were deployed in the Taiwan Strait (TS) and Luzon Strait in 2005 and
2006. Several drifters in the TS and the Pacific were fortuitously overrun by the typhoon Hai-Tang (July 2005) and Shan-Shan
(September 2006), respectively. The drifter and QuikSCAT wind data clearly demonstrate that the surface current over the TS
and the Pacific can change dramatically for a period of about two days due to the strong winds of a typhoon during its passage.
Our results show that the area of storm-affected surface currents is considerably smaller for a weaker typhoon (category 2
Shan-Shan), about 300∼400 km in radius, than for a stronger typhoon (category 5 Hai-Tang), about 800 km in radius. The maximum
observed current speed in the TS was 1.7 ms−1 (or 2.2 ms−1 in net speed change) under the influence of Hai-Tang, and 2 ms−1 in the Pacific under the influence of Shan-Shan. Drifter observations revealed the unusual phenomenon of flow reversal in
the surface layer of TS and the Kuroshio induced by the typhoon passage. The effect of a typhoon on surface flows is amplified
by the long, narrow geometry of the TS. Surface currents generated by wind forcing along the passage of a traveling typhoon
can be explained by the Ekman drift. 相似文献
6.
We propose a new method for the evaluation of the velocities of surface currents according to the data of measurements carried
out by using high-frequency land-based radars. The method is based on the representation of the velocity fields via two scalar
potentials, expansion of these potentials in series in basis functions, and determination of the coefficients of expansion
according to the data of radar measurements as solutions of the corresponding variational problems. The errors of the procedure
of determination of the coefficients of expansion are removed by using a special regularization procedure based on information
theory. The proposed method enables one to fill gaps in the space and time series of radar measurements. We illustrate the
method by an example of numerical analysis of mesoscale and submesoscale (10–50 km) surface currents in the Monterey Bay (California,
USA) performed on the basis of the data of radar measurements carried out in August 1994.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 24–36, March–April, 2005. 相似文献
7.
E. L. Vinogradova P. N. Makkaveev Z. G. Melnikova Yu. R. Nalbandov P. A. Stunzhas P. V. Khlebopashev 《Oceanology》2011,51(5):796-803
The Volga River discharge consists of the waters transferred by fast currents through channels and the waters which are passing
through the shallow areas of the delta overgrown by cane. Using the hydrochemical data, it is possible to track distribution
of the waters modified by “biofilters” of macrophytes in the delta shallows starting from the external edge of the delta.
The main distinctive features of these waters are the high content of dissolved oxygen, the abnormally high values of the
pH, and the low content of dissolved inorganic carbon (both total and as CO2). These waters extend in the shape of 1 to 3-km-wide strips at a distance of 20–40 km from the outer border of the delta.
The analysis of the data obtained during the expeditions run by the Institute of Oceanology of the Russian Academy of Sciences
in 2003–2009, along with archived and published data, show that such “modified” waters occur almost constantly along the outer
edge of the Volga River delta. 相似文献
8.
The seasonal climatic circulation of the sea reconstructed on the basis of assimilation of new arrays of many-year average
hydrological data in a model is analyzed. Five layers are discovered in the structure of climatic currents in the sea in depth:
the surface Ekman layer (∼ 10 m), a layer with small vertical gradients of the kinetic energy (∼ 10–60 m), a layer with relatively
high vertical gradients of the kinetic energy (∼ 60–150 m), a layer with gradual decrease in the kinetic energy and intensification
(from 250–350 m) of the east cyclonic gyre and Batumi anticyclonic eddy (∼ 150–1000 m), and an abyssal layer characterized
by an almost barotropic velocity (∼ 1000–2000 m). The specific features of the seasonal evolution of currents at these depths
are investigated. It is shown that the key role in the formation of deep-water circulation of the sea is played by the south
east flow, east cyclonic gyre, and Batumi anticyclonic eddy.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 28–45, November–December, 2005. 相似文献
9.
南黄海西侧的江苏海岸近岸区域,素以地形复杂、潮流强劲、悬沙输运剧烈著称,但是较长期的同步潮位和潮流观测数据仍然缺乏,尤其是在近岸(20 km)浅水(20 m)区域。2014年1月在大丰港附近开展了连续潮位和潮流观测,获得的数据揭示了一系列特征。此地潮汐潮流为正规半日潮,浅水分潮显著。平均潮差为3.05 m,最显著的两个分潮为M2和S2分潮,振幅分别为1.45 m和0.52 m。潮流最显著的半日分潮M2分潮和最显著的浅水分潮M4分潮在沿岸方向上振幅分别为0.84m/s和0.12m/s,在跨岸方向上振幅分别为0.24 m/s和0.01 m/s,沿岸方向占绝对优势。潮波的沿岸传播介于前进波和驻波之间,驻波的特征稍强。M2分潮潮流椭圆最大流(长轴)方向为南偏东7.4°。存在冬季沿岸向北的余流,垂向平均值的大小为2.2 cm/s。以上潮汐潮流特征为该区域海洋物质输运研究提供了基础资料。 相似文献
10.
The Princeton Ocean Model is adapted to the water area of the Balaklava Bay for the numerical analysis of circulation. The
calculations are performed with the help of the diagnostic method by using the data of the hydrological survey carried out
in the bay in August 1992. We study the structure of the surface and bottom currents in the analyzed period as well as the
vertical circulation of waters and the circulation averaged over the depth. The obtained three-dimensional fields of currents
are used for the numerical analysis of the process of propagation of passive contaminating impurities from the sources located
on the coasts of the Balaklava Bay.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 49–61, May–June, 2005. 相似文献
11.
We study model climatic temperature and salinity fields and the fields of currents in the 350–1000-m layer. The following
specific features are revealed: Colder waters are observed in the regions with anticyclonic vorticity. At the same time, warmer
waters are detected in the regions with cyclonic vorticity. This temperature effect can be explained by the elevation of temperature
with depth below the main pycnocline. In the region of the Sevastopol anticyclone, at depths greater than 500 m, we observe
a zone of cyclonic rotation of waters. Near the Caucasian coast, in the region of Gelendzhik, we reveal a narrow jet current
existing at a depth of 350 m from March till July.
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 1, pp.3–15, January–February, 2009. 相似文献
12.
We present the results of numerical experiments aimed at the simulation of the circulation of waters and transport of impurities
in the Balaklava Bay for typical wind conditions established on the basis of the analysis of the data of in-situ measurements. The currents are computed by using the nonlinear σ-coordinate model. The specific features of the integral
circulation and three-dimensional structure of the current field are investigated. The statistical characteristics of currents
are estimated on the basis of the in-situ data on winds and model calculations. Possible scenarios of propagation of impurities from the coastal sources are analyzed
for various hydrodynamic conditions. It is shown that the localized eddy structures in the current fields (in combination
with the zones of intense vertical motion) can result in a complex character of the transport of substances in the bay and
lead to the formation of local regions of maximum concentrations of impurities on the boundary of the north and central parts
of the bay.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 43–58, July–August, 2005. 相似文献
13.
E. M. Lemeshko A. N. Morozov S. V. Stanichnyi L. D. Mee G. I. Shapiro 《Physical Oceanography》2008,18(6):319-331
The profiles of absolute current velocity obtained by using a lowered acoustic doppler current profiler (LADCP) are presented. In the course of the BSERP-3 expedition, the measurements were carried out in the regions of the Rim Current, anticyclonic eddy, and northwest shelf.
In the core of the Rim Current, a unidirectional motion of waters is traced in layers below the main pycnocline down to depths
greater than 500 m. Its characteristic velocity can be as high as 0.08 m/sec. It is shown that the direct action of the eddy
is detected in the shelf region at distances larger than 20 km from the outer edge of the shelf in the zone bounded by an
isobath of 100 m. The formation of multilayer vertical structures in the field of current velocities is revealed in the region
of interaction of the anticyclonic eddy with irregularities of the bottom on the side of the shelf. A two-layer structure
of currents with specific features in the layer of formed seasonal pycnocline is observed in the region of the shelf down
to an isobath of 100 m. The profiles of the moduli of vertical shears of currents averaged over the casts ensemble are presented
for the abyssal and shelf parts of the sea. It is shown that the shears induced by the geostrophic currents and wave processes
in the region of the main pycnocline are comparable. Below the pycnocline, the shears are mainly determined by the wave processes.
Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 25–37, November–December, 2008. 相似文献
14.
ＥｃｏｌｏｇｉｃａｌｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＯｓｔｒａｃｏｄａｉｎｔｈｅＳｏｕｔｈＨｕａｎｇｈａｉＳｅａａｎｄＥａｓｔＣｈｉｎａＳｅａ￥ＣｈｅｎＲｕｉｘｉａｎｇａｎｄＬｉｎＪｉｎｇｈｏｎｇ（ＴｈｉｒｄＩｎｓｔｉｔｕｔｅｏｆＯｃｅａｎｏｇｒａ... 相似文献
15.
We analyze the seasonal variability of the climatic hydrophysical fields of the Black Sea reporduced in three numerical experiments
carried out according to the model of circulation. The numerical predictions are performed for a period of 12.5 yr on the
basis of the hydrological data accumulated in 1983–1995. The monthly average climatic fields of the current speed are reconstructed
according to the data on the climatic fields of temperature and salinity by the method of hydrodynamic adaptation (standard).
It is shown that, in prognostic calculations, the seasonal variability of temperature and salinity is qualitatively close
to the “standard” dependence. At the same time, the quantitative difference between the climatic behavior of the model and
the standard dependence may be significant. The annual cycle of the currents is characterized by the intensification of the
Main Black-Sea Current in winter. The structure of the hydrophysical fields of the sea in the model becomes much more realistic
if it is based on the actual hydrological data.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
16.
Konstantin V. Lebedev Max Yaremchuk Humio Mitsudera Iwao Nakano Gang Yuan 《Journal of Oceanography》2003,59(6):751-763
A finite-difference quasigeostrophic (QG) model of an open ocean region has been employed to produce a dynamically constrained
synthesis of acoustic tomography and satellite altimetry data with in situ observations. The assimilation algorithm is based upon the 4D variational data interpolation scheme controlled by the model's
initial and boundary conditions. The data sets analyzed include direct and differential travel times measured at the array
of five acoustic transceivers deployed by JAMSTEC in the region of the Kuroshio Extension in 1997, Topex/Poseidon altimetry,
CTD soundings, and ADCP velocity profiles. The region monitored is located within the area 27.5°–36.5°N, 143°–155°. The results
of assimilation show that mesoscale variability can be effectively reconstructed by five transceivers measuring direct and
reciprocal travel times supported by relatively sparse in situ measurements. The misfits between model and data lie within the observational error bars for all the data types used in assimilation.
We have compared the results of assimilation with the statistical inversion of travel time data and analyzed energy balances
of the optimized model solution. Energy exchange between the depth-averaged and shear components of the observed currents
reveals a weak decay of the barotropic mode at the rate of 0.2 ± 0.7⋅10−5 cm2/s3 due to topographic interaction. Mean currents in the region are unstable with an estimate of the available potential energy
flux from the mean current to the eddies of 4.7 ± 2.3⋅10−5 cm2/s3. Kinetic energy transition has the same sign and is estimated as 2.8 ± 2.5⋅10−5 cm2/s3. Potential enstrophy is transferred to the mesoscale at a rate of 5.5 ± 2.7⋅10−18 s−3. These figures provide observational evidence of the properties of free geostrophic turbulence which were predicted by theory
and observed in numerical experiments.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
17.
Two very high-frequency radars (VHFRs), operating in the southern Channel Isles region (English Channel) in February–March 2003, provided a continuous 27-day long dataset of surface currents at 2 km resolution over an area extending approximately 20 km offshore. The tidal range in the region of study is one of the highest in the world and the coastal circulation is completely dominated by tides. The radar data resolve two modes which account for 97% of the variability of the surface current velocities, with the major contribution of the first mode. This mode accounts for oscillating tidal currents whereas the second mode represents motions emerging from the interaction of tidal currents with capes and islands (eddy in the vicinity of the Point of Grouin and jet south of Chausey). A fortnightly modulation of the modal amplitudes causes the exceptional (more than 600%) variability of currents which is well captured by the VHFR observations. The radar data revealed that tidal circulation in the region is flood-dominated with a strong asymmetry of current velocity curve. Wind events and fortnightly variability affect the course of tidal cycle by modifying the magnitude and duration of ebb and flood. In addition to expected features of coastal circulation (tidally dominated flow, eddies) and high wind-current coupling, the residual currents revealed a strong cross-shore structure in the mean and a significant variability which has the same order of magnitude. 相似文献
18.
We present a numerical model of the dynamics of Lake Donuzlav, which enables one to perform simultaneous numerical analyses
of the currents, sea level, waves, and sediment transport. The model is based on the hydrodynamic block and the spectral wave
model. For typical storm situations, we study the specific features of the integral circulation of waters and the three-dimensional
structure of currents, investigate the wind-induced wave fields, and evaluate the flows of sediments and deformations of the
bottom. The presence of intense eddy structures is revealed in the field of currents caused by the bottom topography. A significant
intensification of waves in the south part of the lake is established in the case of penetration of storm waves through the
strait. It is shown that the account of waves leads to qualitative changes in the structure of circulation in the lake and
to the formation of well-pronounced areas of wave-induced elevations and lowerings of the sea level.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 43–65, March–April, 2006. 相似文献
19.
We generalize the problem of evaluation of currents caused by the action of breeze winds to the three-dimensional case. In
the “solid-lid” approximation, the problem is reduced to the numerical solution of a two-dimensional equation for the integral
current function (with complex-valued coefficients) with subsequent evaluation of the components of current velocity according
to analytic formulas. The breeze is specified as acting in a narrow coastal strip in the form of a zonal wind. The three-dimensional
structure and the variations of currents near the west boundary of the Kerch Strait as functions of time are studied in detail. 相似文献
20.
Coupled modeling of currents and wind waves in the Kerch Strait 总被引：1，自引：0，他引：1
We present a numerical model of the dynamics of the Kerch Strait allowing one to perform the coordinated analysis of the fields
of currents and wind waves. The model includes the spectral wave module and the hydrodynamic block of currents. The influence
of waves on the currents is taken into account in the hydrodynamic block both via the surface and bottom tangential stresses
and via the radiation stresses. In order to take into account the inverse influence of currents upon the waves, we use the
fields of currents and sea level from the hydrodynamic block in the wave module. The specific features of the structure of
currents and wind waves in the strait are studied for the typical wave situations. The results of the coupled and separate
simulation are compared and the importance of taking into account the mechanisms of interaction between waves and currents
in the analysis of the dynamic processes in the strait is demonstrated.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 5, pp. 3–20, September–October, 2007. 相似文献