Сhanges of the Structure Indicators and the Salinity Field Average Value in the Sea of Azov

IF 0.7 Q4 OCEANOGRAPHY
E. O. Spiridonova, B. Panov
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引用次数: 1

Abstract

Purpose. The work is aimed at continuing the started in the previous papers investigations of structure of the Azov Sea salinity field based on the oceanographic survey data collected since 2000. Interest in studying this parameter is conditioned by its anomalous increase after 2006. Methods and Results. The data of 49 seasonal oceanographic surveys carried out in the Sea of Azov by the Azov-Black Sea Branch of "VNIRO" ("AzNIIRKH") from 2001 to 2016 permitted to calculate the following: the radii in the concentration region of the field spatial correlation function in the meridional and zonal directions for the surface and bottom layers (the characteristic of the field homogeneity); the ratio between these radii; the sea-average values of salinity field for the surface and bottom layers. The time graphical and the paired correlation analyses of the calculated indicators’ series were done. The average values of the meridional and zonal radii of the concentration region of the spatial correlation function (42.5 and 47.1 km) testify presence of two relatively isolated zones in the sea related to the water circulation. These zones are formed under the conditions of the eastern winds dominating in the region. The average values of the above-mentioned radii in the near-bottom sea layer were approximately equal, whereas in the surface layer, the average zonal radii exceeded the meridional ones. In spring and summer, the meridional radius in the bottom layer surpassed the zonal one. Long-term variability shows that in the surface layer, the meridional radius values tend to increase, and in the bottom layer, the zonal radius ones – to decrease. These trends demonstrate a change in the nature of water exchange in the sea, namely from predominance of the zonal transport to that of the meridional one. Conclusions. Since 2006, the changes in the structure of the Azov Sea water salinity field (trends towards decrease of the zonal radii and increase of the meridional ones in the concentration region of the field spatial correlation function) resulted from decrease in the river water inflow and increase of water exchange with the Kerch Strait, and were accompanied by growth of average salinity. Water exchange with the Kerch Strait in the bottom layer was the most active in spring and summer. The anticipatory shift of the field structural characteristics by 1 and 2 years relative to its average values makes it possible to forecast them with a two-year advance time.
亚速海结构指标和盐度场平均值的变化
目的。本文的目的是根据2000年以来收集的海洋调查资料,继续前人研究亚速海盐度场结构的工作。研究这一参数的兴趣是由其2006年后的异常增加所决定的。方法与结果。利用2001 - 2016年“VNIRO”亚速海-黑海分站(“AzNIIRKH”)在亚速海进行的49次季节性海洋调查数据,计算了表层和底层经向和纬向场空间相关函数集中区域的半径(场均匀性特征);这些半径之间的比值;表层和底层盐度场的海洋平均值。对计算指标序列进行了时间图解和配对相关分析。空间相关函数集中区的经向半径和纬向半径的平均值(42.5 km和47.1 km)证明了海洋中存在两个相对孤立的与水循环有关的区域。这些带是在该地区以东风为主的条件下形成的。在近海底,上述半径的平均值大致相等,而在表层,纬向半径的平均值超过了经向半径。春夏季,底层经向半径大于纬向半径。长期变化表明,在表层,经向半径值有增大的趋势,而在底层,纬向半径值有减小的趋势。这些趋势表明了海水交换性质的变化,即从纬向输送为主转变为经向输送为主。结论。2006年以来,亚速海海水盐度场结构的变化(在场空间相关函数集中区域呈现纬向半径减小、经向半径增大的趋势)是由河流入水量减少和与克赤海峡水量交换增加引起的,并伴随着平均盐度的增长。与底层刻赤海峡的水交换在春夏季最为活跃。油田构造特征相对于其平均值的预测位移为1年和2年,因此可以提前两年对其进行预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
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