渤海夏季環(huán)流結構研究
發(fā)布時間：2018-12-22 08:09
【摘要】：本文利用渤海2006年夏季溫度和鹽度大面觀測資料,通過WKB近似和數值方法計算了渤海夏季第一斜壓羅斯貝變形半徑的分布。第一斜壓羅斯貝變形半徑是表征能否建立起地轉平衡關系的臨界尺度,在此基礎上經過淺水訂正,計算了渤海夏季地轉流流場。結果表明,海流經渤海海峽北部進入渤海,至渤海中部,流動發(fā)生彎曲向北行進,最終在渤海中部對應著混合均勻的高溫水的位置,形成一個順時針的正壓的環(huán)流,該環(huán)流中心位于120.5°E,39°N,半徑約為50~60km,流速約為10cm/s。在長興島以西的遼東灣海域,有一逆時針的環(huán)流。該環(huán)流中心位置為120.8°E,39.7°N,半徑約為60~70km。在該流環(huán)的東北有一分支流沿遼東灣東岸北上,經遼東灣北部向西折,與遼東灣沿岸流相接,最終沿灣西岸南下。在黃河口外海域,有一支海流指向北-東北方向,匯入由渤海海峽流入的渤海的高鹽水系中,至灤河口附近西折回流,在渤海灣口形成逆時針環(huán)流。該環(huán)流中心位于119.2°E,38.8°N附近,流環(huán)呈橢圓結構,南北向的長半軸約為50~60km,東西向的短半軸約為15~30km。在萊州灣,有一弱的順時針的環(huán)流。在北戴河和長興島附近海域,第一斜壓羅斯貝變形半徑最大。在渤海中部等值線發(fā)生明顯彎曲,在靠近渤海海峽內側出現一個小值,而與之對應在渤海中部以西出現一個大值。這些極值區(qū)域剛好對應著渤海的三個環(huán)流,分別是遼東灣中部的逆時針環(huán)流、渤海中部的順時針環(huán)流、和渤海灣口以東的逆時針環(huán)流。極值區(qū)的第一斜壓羅斯貝變形半徑的量值均小于環(huán)流半徑的量值,在地轉調整中,海面高度變化在調整過程中的尺度與羅斯貝變形半徑相比為大量,科氏力同壓強梯度力共同支配流的運動的狀態(tài)達到動態(tài)平衡,因此計算得出的渤海夏季環(huán)流結構是合理可靠的。
[Abstract]:In this paper, the distribution of the first baroclinic Rossby deformation radius in the Bohai Sea in summer is calculated by WKB approximation and numerical method using the large surface temperature and salinity observation data of the Bohai Sea in the summer of 2006. The first baroclinic Rossby deformation radius is the critical scale to indicate whether the geostrophic equilibrium relationship can be established. On this basis the geostrophic flow field in the Bohai Sea in summer is calculated through shallow water correction. The results show that the sea flows through the north of the Bohai Strait into the Bohai Sea and reaches the middle of the Bohai Sea. The flow bends northward and finally corresponds to the position of the mixed high temperature water in the middle of the Bohai Sea, forming a clockwise barotropic circulation. The center of the circulation is located at 120.5 擄E ~ (39) 擄N, the radius is about 50 ~ 60 km, and the velocity of flow is about 10 cm / s. In the Liaodong Bay to the west of Changxing Island, there is an anti-clockwise circulation. The center of the circulation is 120.8 擄E ~ (2 +) 39.7 擄N and the radius is about 6070 km. In the northeast of the current ring, one tributary goes north along the east coast of Liaodong Bay, then bends westward through the northern part of Liaodong Bay, meets the coastal current of Liaodong Bay, and finally goes south along the west coast of Liaodong Bay. In the waters outside the Yellow River estuary, there is a current pointing north to northeast, which flows into the high salt water system of the Bohai Sea from the Bohai Strait, and then flows back to the west near the Luanhe River Estuary, and forms counterclockwise circulation at the Bohai Bay mouth. The circulation center is located around 38.8 擄N of 119.2 擄E ~ (2 +). The flow ring is elliptical. The long half axis in the north and the south direction is about 50 ~ 60 km, and the short half axis in the east-west direction is about 1530 km 路m ~ (-1). In Laizhou Bay, there is a weak clockwise circulation. In the sea area near Beidaihe and Changxing Island, the first baroclinic Ross Bay has the largest deformation radius. In the middle of the Bohai Sea, the contour curve is obviously curved, and a small value appears near the inner side of the Bohai Strait, and a large value is corresponding to the west of the central Bohai Sea. These extreme regions are exactly corresponding to the three circulation in the Bohai Sea, namely, the counterclockwise circulation in the middle of Liaodong Bay, the clockwise circulation in the middle of the Bohai Sea, and the counter-clockwise circulation in the east of the Bohai Bay mouth. The values of the first baroclinic Rossby deformation radius in the extreme region are smaller than those of the circulation radius. In the geostrophic adjustment, the scale of the sea surface height variation in the adjustment process is much larger than that of the Rossby deformation radius. The movement state of the current dominated by Coriolis force and pressure gradient force is in dynamic equilibrium, so the calculated circulation structure in the Bohai Sea in summer is reasonable and reliable.
【學位授予單位】：國家海洋局第一海洋研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P731.27
本文編號：2389537
[Abstract]:In this paper, the distribution of the first baroclinic Rossby deformation radius in the Bohai Sea in summer is calculated by WKB approximation and numerical method using the large surface temperature and salinity observation data of the Bohai Sea in the summer of 2006. The first baroclinic Rossby deformation radius is the critical scale to indicate whether the geostrophic equilibrium relationship can be established. On this basis the geostrophic flow field in the Bohai Sea in summer is calculated through shallow water correction. The results show that the sea flows through the north of the Bohai Strait into the Bohai Sea and reaches the middle of the Bohai Sea. The flow bends northward and finally corresponds to the position of the mixed high temperature water in the middle of the Bohai Sea, forming a clockwise barotropic circulation. The center of the circulation is located at 120.5 擄E ~ (39) 擄N, the radius is about 50 ~ 60 km, and the velocity of flow is about 10 cm / s. In the Liaodong Bay to the west of Changxing Island, there is an anti-clockwise circulation. The center of the circulation is 120.8 擄E ~ (2 +) 39.7 擄N and the radius is about 6070 km. In the northeast of the current ring, one tributary goes north along the east coast of Liaodong Bay, then bends westward through the northern part of Liaodong Bay, meets the coastal current of Liaodong Bay, and finally goes south along the west coast of Liaodong Bay. In the waters outside the Yellow River estuary, there is a current pointing north to northeast, which flows into the high salt water system of the Bohai Sea from the Bohai Strait, and then flows back to the west near the Luanhe River Estuary, and forms counterclockwise circulation at the Bohai Bay mouth. The circulation center is located around 38.8 擄N of 119.2 擄E ~ (2 +). The flow ring is elliptical. The long half axis in the north and the south direction is about 50 ~ 60 km, and the short half axis in the east-west direction is about 1530 km 路m ~ (-1). In Laizhou Bay, there is a weak clockwise circulation. In the sea area near Beidaihe and Changxing Island, the first baroclinic Ross Bay has the largest deformation radius. In the middle of the Bohai Sea, the contour curve is obviously curved, and a small value appears near the inner side of the Bohai Strait, and a large value is corresponding to the west of the central Bohai Sea. These extreme regions are exactly corresponding to the three circulation in the Bohai Sea, namely, the counterclockwise circulation in the middle of Liaodong Bay, the clockwise circulation in the middle of the Bohai Sea, and the counter-clockwise circulation in the east of the Bohai Bay mouth. The values of the first baroclinic Rossby deformation radius in the extreme region are smaller than those of the circulation radius. In the geostrophic adjustment, the scale of the sea surface height variation in the adjustment process is much larger than that of the Rossby deformation radius. The movement state of the current dominated by Coriolis force and pressure gradient force is in dynamic equilibrium, so the calculated circulation structure in the Bohai Sea in summer is reasonable and reliable.
【學位授予單位】：國家海洋局第一海洋研究所
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P731.27
【共引文獻】
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