共查询到20条相似文献，搜索用时 25 毫秒
1.
A. G. Andreev 《Russian Meteorology and Hydrology》2010,35(9):633-640
The interannual variations of the sea level at the coastal stations of the Sea of Japan and of the water discharge through
the Korea (Tsushima) Strait are studied. It is demonstrated that the interannual variations of the water discharge through
this strait are determined by the water discharge of the Oyashio (in the subarctic Pacific) and the Kuroshio (in the East
China Sea) currents and by the zonal wind stress component over the Sea of Japan in winter period. It is revealed that the
variations in the East China Sea water transport through the Korea (Tsushima) Strait cause the interannual variations of the
dissolved oxygen content in intermediate (500 m) and deep (1000 m and more, σθ = 27.35) waters of the Sea of Japan. 相似文献
2.
The influence of interannual variability of water transport by the East Kamchatka Current, the Oyashio, and the East Sakhalin Current on the dissolved oxygen concentration in the western subarctic Pacific and the Sea of Okhotsk is considered for studying climate change impact on sea water chemical parameters. It is shown that statistically significant relation is observed between the calculated with the Sverdrup equation interannual variations in water transport with the East Kamchatka Current, the Oyashio, and the East Sakhalin Current and changes in mean sea water level at coastal stations in winter. It is found that the main reason of interannual variability of the dissolved oxygen concentration at isopycnic surfaces in the intermediate water layer (100–800 m) of the Sea of Okhotsk and in the western subarctic Pacific is caused by variations in water transport by the East Kamchatka Current, the Oyashio, and the East Sakhalin Current. 相似文献
3.
A. S. Kukushkin 《Russian Meteorology and Hydrology》2018,43(7):464-472
Using the data of long-term observations of the Secchi disk visibility depth and water salinity (1947-2000) and satellite monitoring of chlorophyll a concentration (1978-1986), their seasonal spatial distributions and intraannual variability in the coastal waters of the western Black Sea are considered. The estimates of seasonal variations are obtained for the coastal zone of the sea. A good agreement is demonstrated between intraannual variations in the salinity of transformed river water, chlorophyll a concentration, and transparency in the areas where these waters propagate. We studied the effects of the Danube River runoff and transformed river water on the phytoplankton development and chlorophyll a concentration which largely define water transparency. 相似文献
4.
The seasonal variability of oceanographic conditions in the southern part of the Sea of Okhotsk is described based on long-term mean temperature T and salinity S from observations along a standard oceanographic section Cape Aniva-Cape Dokuchaev (May–November). It is shown that the Soya Current is relatively weak in spring, with low temperature and salinity gradients along the section. The Sea of Okhotsk low-salinity water mass is observed in the upper layer. It was formed as a result of melting of a large amount of ice brought here with the East Sakhalin Current from the northwestern part of the Sea of Okhotsk. A cold intermediate layer (CIL) at depths of 50–150 m extends along the entire section. The cold intermediate layer core with a temperature at the edge of the Sakhalin shelf of about ?1.3°C is retained during a period of maximum warming in August; however, in October–November the intensified flow of the East Sakhalin Current (up to 50 cm/s) results in a situation when relatively warm low-salinity waters, connected with the Amur River runoff, dissipate CIL. The results of 12 surveys conducted by the Sakhalin Research Institute for Fisheries and Oceanography in 1998–2004 show significant deviations of T and S [10] in different years from the calculated values. Generally, maximum anomalies (ΔT > 4°C and ΔS > 0.55‰) are observed in the surface layer. Their values and statistical significance decrease with depth. However, the situation is opposite in some cases. The maximum deviation from normal was observed in June 1999, when warm and salt waters were located much further seaward from the Kunashir shelf, which is most likely connected with the Soya Current meandering. 相似文献
5.
Presented are the results of mercury content measurements in the surface air layer in the Sea of Japan in the period from October 27 to November 11, 2010. It is revealed that the mercury content varied from 0.6 to 3.8 ng/m3. It is demonstrated that the mercury concentration distribution has geographical zoning and depends on the movement of air masses and on the closeness of anthropogenic sources. The maximum mercury concentration is detected in the central part of the sea at the southwestern and southern directions of the wind, that is associated with the industrial emissions of East Asia countries. The minimum mercury concentration corresponding to the concentration in the surface air layer of the Arctic, Atlantic Ocean (Northern Hemisphere), and the Sea of Okhotsk and Bering Sea was observed along the coast of Primorye at the northwestern wind direction. 相似文献
6.
M. D. Kravchishina A. A. Klyuvitkin V. N. Lukashin N. V. Politova A. N. Novigatsky A. P. Lisitsyn 《Russian Meteorology and Hydrology》2018,43(10):697-705
The distribution of suspended particulate matter (SPM) and chlorophyll a in the Caspian Sea water column from April to November in 2008–2016 is analyzed. It is shown that the spatiotemporal variability of SPM concentration is defined by its sources, especially by the autochthonous (primary production) and allochthonous (particulate river runoff, aerosols) components. The effect of marginal filters of rivers on the volume of coming allochthonous SPM is considered. It is revealed that chlorophyll a is a reliable marker of the autochthonous component of SPM and biogenic sedimentation conditions. The stable vertical stratification defines the distribution of allochthonous and autochthonous SPM in the water column. Vertical profiles of these SPM components in the active layer (its thickness is usually up to ~60 m, more rarely to ~100 m) of the sea are similar in April and October-November and differ much in May-September. 相似文献
7.
Seasonal Variability of the Yellow Sea／East China Sea Surface Fluxes and Thermohaline Structure 总被引：1，自引：0，他引：1
We use the U.S. Navy‘s Master Oceanographic Observation Data Set (MOODS) for the Yellow Sea/East China Sea (YES) to investigate the climatological water mass features and the seasonal and non-seasonal variabilities of the thermohaline structure, and use the Comprehensive Ocean-Atmosphere Data Set (COADS) from 1945 to 1989 to investigate the linkage between the fluxes (momentum, heat, and moisture) across the air-ocean interface and the formation of the water mass features. After examining the major current systems and considering the local bathymetry and water mass properties, we divide YES into five regions: East China Sea (ECS) shelf, Yellow Sea (YS) Basin, Cheju bifurcation (CB) zone,Taiwan Warm Current (TWC) region, Kuroshio Current (KC) region. The long term mean surface heat balance corresponds to a heat loss of 30 W m^-2 in the ESC and CB regions, a heat loss of 65 W m^-2 in the KC and TWC regions, and a heat gain of 15 W m^-2 in the YS region. The surface freshwater balance is defined by precipitation minus evaporation. The annual water loss from the surface for the five subarea sranges from 1.8 to 4 cm month^-1. The fresh water loss from the surface should be compensated for from the river run-off. The entire water column of the shelf region (ECS, YS, and CB) undergoes an evident seasonal thermal cycle with maximum values of temperature during summer and maximum mixed layer depths during winter. However, only the surface waters of the TWC and KC regions exhibit a seasonal thermal cycle. We also found two different relations between surface salinity and the Yangtze River run-off,namely, out-of-phase in the East China Sea shelf and in-phase in the Yellow Sea. This may confirm an earlier study that the summer fresh water discharge from the Yangtze River forms a relatively shallow, low salinity plume-like structure extending offshore on average towards the northeast. 相似文献
8.
Seasonal variations of hydrological conditions in the area adjoining the southeastern coast of Sakhalin Island are described based on the analysis of monthly mean temperature and salinity obtained over standard oceanic sections Makarov-Cape Georgii and Cape Svobodny-the sea and from nine oceanic surveys. The Poronai River runoff that promotes the formation of a warm surface layer with low salinity largely influences the water area of Terpeniya Bay in the northern part of the area studied. In spring, these waters primarily spread southward along the coast; in summer, they flow southeastward, forming a weak vortex structure at 144° E. In the fall, major changes occur below 20 m, where waters of the cold intermediate layer are replaced by warmer waters (4–6°C) of low salinity connected with the Amur River runoff. The destruction of the CIL core near the shelf edge at depths of about 100 m resulting from the fall intensification of the East Sakhalin Current is pronounced in the southern, abyssal part of the region. The coastal area is covered by waters with salinity below 32‰ connected with the Amur River runoff. The volume of low-salinity waters coming through the Cape Svobodny-the sea section into the southern part of the Sea of Okhotsk is estimated at 3000 km3 taking into account instrumental measurements of flow rates. 相似文献
9.
Hiroaki Ueda Yuusuke Amagai Masamitsu Hayasaki 《Asia-Pacific Journal of Atmospheric Sciences》2017,53(2):287-293
La Niña conditions during boreal winter sometimes brings excessive snowfall in Japan, especially on the East Sea/Sea of Japan coastal and mountain areas through intensified northwesterly cold winds caused by La-Niña related atmospheric teleconnection. Meanwhile, snowfall events also increase in the Pacific coast area of Japan during the El Niño state due to extratropical cyclones passing along the south coast of Japan (hereafter referred to as South-coast cyclone). In the present study, we investigated year-to-year snowfall/rainfall variations based on meteorological station data and cyclone tracks identified by using the Japanese 55-year Reanalysis. The result clearly indicates increase of the South-coast cyclone during El Niño-developing winters, which is consistent with excessive snow-fall in the northern part of the Pacific coast. Strong subtropical jet hampers cyclogenesis due to less vertical interaction through the trapping of upper-level eddies. During El Niño-developing winters, the subtropical jet is weakened over East Asia, indicating dynamic linkage to increased cyclone frequency. In addition to this, both the deepening of the upper-tropospheric trough over East Asia and anomalous low-tropospheric northwest anticyclones extending from the Philippines toward Japan are also consistent with the enhancement of cyclogenesis over the East China Sea as well as warm winter in Japan. 相似文献
10.
A. S. Kukushkin 《Russian Meteorology and Hydrology》2013,38(7):486-495
Considered are the effects of suspended matter content and water mass dynamics on the formation of optical structure of water in the upper layer of the deep part of the Black Sea using the data of long-term simultaneous observations. It is demonstrated that the peculiarities of horizontal distribution of the depth of transparent and turbid optical layers depend on the distribution of hydrological parameters characterizing the dynamic processes in the upper layer of the sea. Computed and analyzed are the parameters of regression relationship between the beam attenuation coefficient and the concentration of organic and total suspension and chlorophyll-a as well as between the depth of transparent layer and the position of the lower boundary of cold intermediate layer in different dynamic formations in spring, summer, and autumn. 相似文献
11.
近50a东北冷涡暴雨水汽源地分布及其水汽贡献率分析 总被引：2，自引：1，他引：1
用HYSPLIT v4.9轨迹追踪模式,以分辨率为2.5°×2.5°的再分析资料驱动模式,对东北地区308例冷涡暴雨过程中的目标气块,进行后向轨迹追踪模拟。结果显示东北冷涡暴雨主要有4个水汽源地,(Ⅰ)西太平洋及相邻海域(包括鄂霍次克海、日本海、黄海、渤海和东海)水汽贡献率最大,平均水汽贡献率达39.8%;依次是(Ⅱ)孟加拉湾—南海海域为32.1%;(Ⅲ)欧亚大陆,尤其是贝加尔湖附近为20.9%;(Ⅳ)东北地区的水汽贡献率最小,仅为7.2%。欧亚大陆主要输送700 hPa高度附近的干冷气团,而各海域则输送800 hPa高度以下的暖湿气团。 相似文献
12.
海洋对全球变暖的响应及南海观测证据 总被引：1，自引：0，他引：1
回顾了世界各大洋和若干区域海洋的海平面、热含量、温盐结构及珊瑚变化等方面的主要成果,并对中国南海温盐结构的长期变化趋势进行了初步分析。结果表明,对全球增暖的响应,南海中层水盐度的长期变化表现出一定的淡化趋势。 相似文献
13.
我国夏季降水及相关大气环流场未来变化的预估及不确定性分析 总被引：8，自引：1，他引：7
利用政府间气候变化专门委员会第四次评估报告(IPCCAR4)的15个耦合气候模式在不同排放情景下的模拟结果,对我国夏季降水及相关大气环流场的未来时空变化特征与模式之间的不确定性作了研究。结果表明,在全球变暖背景下,我国夏季降水表现出较强的局地特征。其中,我国东部和高原地区的降水在21世纪表现出明显的增加趋势,而且这种趋势随着变暖的加剧而增强,同时模式模拟结果之间的一致性也更好,表明这一结果的可信度较高。在全球变暖背景下,我国新疆南部地区表现为持续的降水减少趋势,而我国西南地区夏季降水的变化则呈现出先减少(21世纪初)后增加的特征,不同模式对降水这些局地特征的模拟也都表现出较好的一致性。其他地区夏季降水在21世纪的变化不大,同时模式模拟的一致性也较差。多模式模拟的我国未来百年夏季降水的这些变化特征在温室气体高、中、低不同排放情景下基本一致,A2情景预估结果变化最大,A1B次之,B1相对最小。东亚夏季大气环流场的预估结果显示,在全球变暖的背景下,大部分模式的模拟结果都表明,东亚夏季风环流有所增强,从而使得由低纬度大洋和南海地区向我国大陆的水汽输送增加,造成该地区大气含水量的增多,从而为我国东部地区夏季降水的增加提供有利条件。此外,随着全球变暖的加剧,西太平洋副热带高压持续增强,其变化对我国东部地区夏季降水的影响程度和范围也明显增大。这些环流场及其不确定性的分析结果进一步加强了我国夏季降水未来变化预估结果的可信度。 相似文献
14.
Analyzed is the intraannual variability ofvertical distribution of salinity in the southern part of the Sea of Japan. It is demonstrated that the sign change in freshwater balance is the reason for the formation and disappearance of minima and maxima of salinity in the water column. The dynamics of variability of salinity minima parameters is demonstrated for the first time. The conclusion is made that the salinity minimum cannot be considered as a water mass because it is a temporary phenomenon. 相似文献
15.
We describe the long-term stability and mean climatology of oceanic circulations simulated by version 2 of the Flexible Global Ocean-Atmosphere-Land System model(FGOALS-s2).Driven by pre-industrial forcing,the integration of FGOALS-s2 was found to have remained stable,with no obvious climate drift over 600 model years.The linear trends of sea SST and sea surface salinity(SSS) were 0.04°C(100yr)-1 and 0.01 psu(100yr)-1,respectively.The simulations of oceanic temperatures,wind-driven circulation and thermohaline circulation in FGOALS-s2 were found to be comparable with observations,and have been substantially improved over previous FGOALS-s versions(1.0 and 1.1).However,significant SST biases(exceeding 3°C) were found around strong western boundary currents,in the East China Sea,the Sea of Japan and the Barents Sea.Along the eastern coasts in the Pacific and Atlantic Ocean,a warm bias(>3°C) was mainly due to overestimation of net surface shortwave radiation and weak oceanic upwelling.The difference of SST biases in the North Atlantic and Pacific was partly due to the errors of meridional heat transport.For SSS,biases exceeding 1.5 psu were located in the Arctic Ocean and around the Gulf Stream.In the tropics,freshwater biases dominated and were mainly caused by the excess of precipitation.Regarding the vertical dimension,the maximal biases of temperature and salinity were located north of 65°N at depths of greater than 600 m,and their values exceeded 4°C and 2 psu,respectively. 相似文献
16.
中国东部夏季降水年际变化与东中国海及邻近海域海温异常的关系 总被引：8，自引：0，他引：8
本文首先利用1979～2008年中国756个站点和GPCP2.1的降水资料与Hadley中心的HadISST再分析海温资料以及应用合成和相关分析方法, 分析了中国东部夏季降水年际变化及其与东中国海及邻近海域海温异常的关系。分析结果表明: 当东中国海及邻近海域为暖 (冷) 异常时, 长江中下游、 江淮地区夏季降水减少 (偏多), 而东北南部的降水偏多 (减少)。并且, 本文应用RegCM3区域气候模式对上述关系进行数值试验, 结果表明了东中国海及邻近海域的暖 (冷) 异常, 将使得我国长江、 黄淮流域和华北大部分地区夏季降水的减少 (增加), 而华南地区、 东北南部和朝鲜半岛等地夏季降水的增加 (减少)。此外, 本文还利用NCEP/NCAR再分析资料和数值模拟对上述关系的大气环流变异过程进行了分析, 分析结果揭示了上述海域的升温或降温对东亚地区上空的纬向和经向环流有较明显的影响。当东中国海及邻近海域升温时, 除了在该海域东部引起低空辐合, 高空辐散, 产生上升运动外, 还在其西部的长江、 黄淮流域和华北地区引起低空辐散, 高空辐合, 产生下沉运动, 这将引起长江、 黄淮流域和华北等地夏季降水的减少; 并在华南、 东北南部和朝鲜半岛地区引起低空辐合, 高空辐散, 从而产生上升运动, 这使得华南地区、 东北南部和朝鲜半岛夏季降水的增加。反之, 当东中国海及邻近海域降温时, 上述区域出现相反的现象。这些都说明东中国海及邻近海域的热力状态可能是影响我国东部夏季降水的重要因子之一。 相似文献
17.
Jianhong WANG Meiqi LI X.San LIANG Xing WANG Feng XUE Mo PENG Chunsheng MIAO 《大气科学进展》2018,35(7):826-838
The asymmetrical structure of typhoon-induced ocean eddies(TIOEs) in the East China Sea(including the Yellow Sea)and the accompanying air–sea interaction are studied using reanalysis products. Thirteen TIOEs are analyzed and divided into three groups with the k-prototype method: Group A with typhoons passing through the central Yellow Sea; Group B with typhoons re-entering the sea from the western Yellow Sea after landing on continental China; and Group C with typhoons occurring across the eastern Yellow Sea near to the Korean Peninsula. The study region is divided into three zones(Zones Ⅰ, Ⅱ and Ⅲ) according to water depth and the Kuroshio position. The TIOEs in Group A are the strongest and could reverse part of the Kuroshio stream, while TIOEs in the other two groups are easily deformed by topography. The strong currents of the TIOEs impact on the latent heat flux distribution and upward transport, which facilitates the typhoon development. The strong divergence within the TIOEs favors an upwelling-induced cooling. A typical TIOE analysis shows that the intensity of the upwelling of TIOEs is proportional to the water depth, but its magnitude is weaker than the upwelling induced by the topography. In Zones Ⅰ and Ⅱ, the vertical dimensions of TIOEs and their strong currents are much less than the water depths.In shallow water Zone Ⅲ, a reversed circulation appears in the lower layer. The strong currents can lead to a greater, faster,and deeper energy transfer downwards than at the center of TIOEs. 相似文献
18.
19.
Possible impacts of Barents Sea ice on the Eurasian atmospheric circulation and the rainfall of East China in the beginning of summer 总被引：2，自引：1，他引：1
Possible influences of the Barents Sea ice anomalies on the Eurasian atmospheric circulation and the East China precipitation distribution in the late spring and early summer (May-June) are investigated by analyzing the observational data and the output of an atmospheric general circulation model (AGCM).The study indicates that the sea ice condition of the Barents Sea from May to July may be interrelated with the atmospheric circulation of June. When there is more than average sea ice in the Barents Sea, the local geopotential height of the 500-hPa level will decrease, and the same height in the Lake Baikal and Okhotsk regions will increase and decrease respectively to form a wave-chain structure over North Eurasia.This kind of anomalous height pattern is beneficial to more precipitation in the south part of East China and less in the north. 相似文献
20.
Based on the daily maximum air temperature data from 300 stations in China from 1958 to 2008, the climatological distribution of the number of days with high temperature extremes （HTEs, maximum temperatures higher than 35℃） are studied with a focus on the long-term trends. Although the number of HTE days display well-defined sandwich spatial structures with significant decreasing trends in central China and increasing trends in northern China and southern China, the authors show that the decrease of HTE days in central China occurs mainly in the early period before the 1980s, and a significant increase of HTE days dominates most of the stations after the 1980s. The authors also reveal that there is a jump-like acceleration in the number of HTE days at most stations across China since the mid 1990s, especially in South China, East China, North China, and northwest China. 相似文献