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1.
基于WOA13的温盐数据资料,利用绝对梯度分析法,对太平洋赤道海区的温度、声速锋面的时空分布特征进行了分析,结果表明,3种要素的锋面均存在于一南一北两个位置。温度锋面:北赤道温度锋面全年均存在,锋面位置主要分布在7°N、水深30~200 m处,锋面随深度加深逐渐向西移动,秋季锋面分布范围最广且锋强度最大,春季锋面分布范围最小且锋强度最小。南赤道温度锋面全年存在,锋面位置主要分布在5°S、水深50~275 m处。随深度加深,锋面也逐渐向西移动且东西跨度变长。春季锋的强度最大,秋季的锋强度最弱。声速锋面:声速锋与温度锋的位置大致相同,且两者在锋轴线上同一点处的锋强度的相关系数接近于1,可见温度对声速的影响很大。此外,最大声速锋强出现在水深100 m处。 相似文献
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基于2000-2017年的MODIS-Terra气候态月平均海表温度数据检测了东印度洋季风带海域的温度锋,统计了各锋面每月发生的锋点数量、锋面平均强度及中心线长度,并基于2000—2017年逐年海表温度数据,研究了以恒河-雅鲁藏布江河口锋和爪哇岛锋为代表的典型温度锋面的年际变化。结果发现:在3、4月,东印度洋季风带海域的锋面最弱、数量最少;5-10月期间,5°~15°N及5°~15°S一带的温度锋出现并发展;12、1、2月最北部锋面发展并趋向成熟。研究区存在恒河-雅鲁藏布江河口锋、爪哇岛锋、Palk海峡锋、东锡兰锋及伊洛瓦底江河口锋5个温度锋,其中最北部的恒河-雅鲁藏布江河口锋全年存在,东北季风时期长度较长,强度较大,最南部的爪哇岛锋存在于4—11月,西南季风时期较强,长度和数量也处于较高水平,其余锋面主要发生于西南季风盛行时期,且强度、长度等变化相对较小。两个典型温度锋空间位置的年际变化均不大,恒河-雅鲁藏布江河口锋平均强度的年际变化较大,最大超过0.03℃/km,长度变化相对较小;爪哇岛锋平均强度的变化相对平稳,但锋点数量和中心线长度存在较大的年际变化。 相似文献
3.
《海洋预报》2017,(6)
基于50 a的SODA的温度数据,利用绝对梯度分析法求出锋面的概率分布,对索马里东岸的温度锋面的分布特征进行了分析。此外利用WOA13的温盐数据,对锋区出现概率较大海区的声速剖面进行了分析。结果表明:温度锋面在浅水处的概率分布与深水处存在异同,锋面主要集中分布在6—10月、6°~10°N沿岸附近,通过研究SODA海流数据,发现锋面分布概率较大的海域有着明显的上升流。利用EOF分析,发现温度锋面的年际变化并不强,主要是年内的季节变化较为明显。声速剖面在有无锋面存在的位置处存在明显差异,上升流带来的底层冷水导致声速要明显小于其他区域,锋面同一位置处,由于夏季锋强最大,锋区的声速也明显小于其他季节。 相似文献
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北部湾温度锋的季节与年际变化 总被引：1，自引：0，他引：1
采用8a(1991—1998)的卫星遥感海水表面温度资料(AVHRR SST)对北部湾温度锋的季节变化与年际变化规律进行了探讨。北部湾海区温度锋的季节态强弱趋势为春季最强，夏季、冬季次之，秋季最弱。在年际时间尺度上，温度锋强度与SST距平(SSTA)存在响应关系，表现在：1)SST正距平对应较弱的锋面产生，负距平对应较强的锋面产生，这种相关性在冬季表现得最为明显；2)锋面的强弱与SSTA绝对值存在正相关关系，即SSTA变化越大，锋面越强。在冬季，温度锋强度与海面风经向分量相关，在偏北风异常情况下，锋面较强；反之，锋面较弱。 相似文献
6.
《热带海洋学报》2016,(5)
以2006—2013年卫星遥感海表温度资料(GHRSST SST)为基础,通过数字图像处理的边缘检测方法提取温度锋面的核心位置,分析了琼东、粤西海域海表温度锋位置及强度的季节变化和年际变化特征,并进一步结合海面高度异常资料和海面风场资料探讨了温度锋变化的可能机制。分析结果表明,琼东、粤西海域温度锋的空间分布及锋面强度存在显著的季节变化,沿岸风应力是影响该海域锋面变化的主要动力因素。夏季温度锋面主要分布于琼东沿岸的东部及南部海域近岸50m到100m等深线之间,而冬季则主要分布在琼东的东部海域和粤西沿岸20m到100m等深线之间,春秋两季为其过渡季节;锋面强度的季节变化表现为冬季最强,春季、夏季次之,秋季最弱,其冬季锋面强度平均值可达到3℃?100km–1,夏季为1.7℃?100km–1;同时,锋面核心位置及强度的分析结果表明,琼东和粤西海域温度锋也存在较强的年际变化。 相似文献
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《热带海洋学报》2017,(5)
基于2015年全年多源遥感数据融合的Operational Sea Surface Temperature and Sea Ice Analysis(OSTIA)海表温度数据,利用最大温度梯度法,对广东沿岸(20°—23°N,110°—118°E)海表温度锋面的季节变化及生消机制进行了分析。广东沿岸温度锋面季节变化明显,冬季强,夏季弱;粤东温度锋面常年存在,粤西温度锋面夏季消失;珠江口区域温度锋面与珠江羽状流的扩散路径有关,即夏季锋面主轴往东北方向延伸,秋季往西南方向延伸。对比温度锋面与风速的关系,发现其形成及消失受季风的影响。通过简单的模型实验,发现季风通过影响锋面两侧的湍流热通量引起锋面强度的变化:西南(东北)季风带来的暖湿(干冷)空气减弱(增加)了近岸冷水的潜热释放,导致冷水区温度上升(下降)大于暖水区,引起锋面消失(生成)。 相似文献
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《应用海洋学学报》2015,(4)
通过对WOA13数据库季节平均数据的分析依次得到锋区内0~1 000 m各层锋轴线的位置,对马海流锋轴线位置由表层的40°N附近随深度增加逐渐南移到39°N附近且位置的季节摆动幅度增大.利用绝对梯度方法对温度锋强度与盐度锋强度的水平分布及垂直变化进行了分析;对比了四季锋强度的差异以及差异比率,得到了不同深度不同季节锋强度强弱分布的规律.对比声速穿过锋线时的差异认为表面声速从南到北逐渐减小,锋轴线南北两侧声速差异主要集中在150 m以内,且随深度增加声速差异减小.此外,还运用BELLHOP模型对锋区内700 m以浅的声道特点以及声传播损失进行了简单分析. 相似文献
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The analysis of the structure of the cryolithozone, facies, and thicknesses of the Quaternary sediments and the results of the physicochemical mathematical modeling of the modern shelf of the western part of the Laptev Sea support the influence of the Late Pleistocene glaciations on the heat conditions and the distribution of the permafrost in the area. A ～200-m thick glacier formed under aerial conditions from atmospheric precipitation represented the metamorphosed snow cover. According to the modeling, the long-living (from 60?50 to 10?4 ky) glacier reduced the thickness of the permafrost rocks in the reviewed shelf area for 280–360 m. The Holocene marine transgression additionally decreased the thickness from 50–140 m on the inner shelf to 220–350 m on the outer shelf. The modern submarine cryolithozone 450-0 m thick is wide-spread in the studied region from the coast to the shelf boundary (isobaths of 130–140 m), where it pinches out at a distance of ～380 km from the coast at a depth of ～250 m above the sea level. 相似文献
12.
We analyze the components of the carbon system of the Sevastopol bay waters and the balance of main sediment-forming substances
using the data of field investigations in 1998–2008. The interannual variations of total inorganic carbon and the equilibrium
partial pressure of carbon dioxide in the bay water are noted. An increase in the flux of carbon dioxide into the bay and
in the content of organic carbon in bottom sediments is revealed, and an explanation of this phenomenon is given. The priority
accumulation of organic carbon in the sediments of the bay is established. We assess the interannual variation in the relative
abundances of organic and inorganic carbon as an index of the carbon cycle stability. 相似文献
13.
We generalize and analyze the state of investigations of the influence of river waters on the hydrologic structure of the
Black Sea. Specific features of the water, regime and hydrography of rivers flowing into the sea, data on the discharge of
rivers, and intrayear and interyear variability of the discharge are presented. We discuss and analyze works studying the
transformation of river waters, routes of desalinized sea waters, and their influence on the thermohaline structure and dynamic
regime of the sea.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
14.
V. A. Ivanov S. P. Lyubartseva N. Mikhailova N. B. Shapiro 《Physical Oceanography》2001,11(6):509-524
We analyze the results of numerical calculations performed according to the three-dimensional interdisciplinary model of an
ecological system of the Black-Sea shelf zone near the estuary of the Danube. The complete system of equations of hydrothermodynamics
is solved together with transport equations of the advection-diffusion-reaction type used to describe the transformation of
a substance (nitrogen) between the components of the characteristic vectors of the ecosystem: plankton, detritus, and biogenic
elements (nitrates). We describe the distinctive features of the circumcontinental distribution of components obtained as
a result of numerical experiments and present arguments for the conclusion that the ecosystem of the Danube estuary water
area plays the role of a buffer zone between the press of the Danubian biogenic pollutions and the neighbouring areas of the
shelf zone and open sea.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
15.
Ten years of semistationary studies of the interaction of the ice cover and the coastal relief of the Kandalakhsa Gulf in the White Sea allowed us to reveal the peculiarities of these processes in the warm and cold years and the mechanisms of the origination of ice forms, including ice tents, which govern the character of the tidal flats. Three dynamic fast ice zones are distinguished by their geomorphological location, morphology, and ice dynamics. The dependence of the mechanisms and volumes of the enrichment of the fast ice in the sediments on the coastal zone??s relief was established. At the coast of the Kindo Peninsula (Velikaya Salma Strait), the ice mostly contains fine-sandy sediments. Coarser sediments, including boulders, are occasional and frozen into the ice at the contact of the fast ice and the bottom. At the expense of the ice??s spreading by 4?C6 times in the warm years and 2?C4 times in the cold years, several thousand tons of sediments mostly from the tidal flat??s surface (100?C700 m3 from 1 km of coast in the wide tidal flats and <50 m3 on the steep coasts) are delivered to the water area. 相似文献
16.
Relationship between the path of the Kuroshio in the south of Japan and the path of the Kuroshio Extension in the east 总被引：2，自引：0，他引：2
A relationship between paths of the Kuroshio and Kuroshio Extension (KE) is investigated, using the satellite-derived altimetry
dataset of 1993–2008. When the Kuroshio takes the nearshore nonlarge meander path or typical large meander path and resultantly
goes through the deeper channel (about 2500 m) of the Izu-Ogasawara Ridge, the KE path adopts a relatively stable state with
the two quasi-stationary meanders. On the other hand, when the Kuroshio takes the offshore nonlarge meander path and then
passes over the shallower part of the Ridge (about 1000 m), the KE path tends to be convoluted, i.e., an unstable state. 相似文献
17.
E. L. Vinogradova 《Oceanology》2008,48(4):483-492
The spatiotemporal variability of the hydrochemical composition of the riverine runoff in nearmouth areas is presented using the example of selected rivers of the Arctic Basin. The temporal dynamics of the riverine nutrient runoff are mainly determined by the seasonal and interseasonal variations in the drainage basins. The spatial variations in the chemical composition of riverine waters in the near-mouth areas are mainly caused by the dynamics of the water flow and the river bed relief and, to a lesser degree, by biochemical processes. It is shown that the variations in the nutrient composition of the waters in near-mouth areas are comparable in magnitude to those at the river-sea geochemical barriers. 相似文献
18.
The methodology and the first results of the computations of the volumes, masses, and growth rates of the sedimentary body of the buried Black Sea basin are presented. Their temporal evolution reflects the regional paleogeodynamics, in particular, the reorientation of the vector of the relative movement of the Arabian and Eurasian lithospheric plates and the related intensification of their collision in the late Miocene-Pliocene. 相似文献
19.
I. G. Ostrovskaya 《Physical Oceanography》1992,3(5):397-403
Three mathematical models are considered: a two-dimensional model for calculating the concentration fields of the ecosystem components on the shelf of the Republic of Guinea, a pointwise model for the annual variation of the components, and a two predators-prey model. These models are used to study the effect of hydrodynamic conditions on the state of the shelf ecosystem and for research into the causes which distort the balance between marketable and unmarketable fish.Translated by Mikhail M. Trufanov. 相似文献
20.
Al. A. Shreider 《Oceanology》2007,47(1):91-103
The first data on the temporal evolution of the slope of the buried depression of the Black Sea are obtained. The sharp change in the rate of the decrease in the slope steepness that occurred in the Late Miocene-Pliocene time reflects a reorientation of the vector of mutual movement and a related intensification of the collision between the Arabian and Eurasian lithospheric plates. 相似文献