黃渤海環(huán)流對冬季大風過程的響應機制研究
發(fā)布時間：2018-08-19 06:26
【摘要】：冬季，黃渤海域常有寒潮引發(fā)的大范圍的大風過程，本文關注于黃渤海環(huán)流對冬季大風天氣的高頻響應，包括黃海暖流的延遲響應、黃海暖流的西偏過程以及渤黃海的水交換過程，并研究天氣尺度的黃海陸架波以及開爾文波在黃渤海環(huán)流響應過程中的作用。 關于大風過程下的黃海暖流延遲響應，現(xiàn)場觀測以及數(shù)值模式結果均顯示，黃海暖流很好地響應大風爆發(fā)過程，但是存在響應時間上的滯后（形成滯后和峰值滯后），并且黃海暖流的響應過程伴隨著黃海陸架波的傳播。進一步的理論分析揭示了陸架波使黃海暖流產(chǎn)生延遲響應的動力學機制：黃海暖流在緯向上處于地轉平衡，陸架波通過調(diào)整緯向上的壓強梯度力來調(diào)整黃海暖流的強度。在大風爆發(fā)階段，激發(fā)的陸架波傳播之后才可以提供緯向上的壓強梯度力，此時黃海暖流才得以形成，故將滯后大風的爆發(fā)時刻；在大風衰退階段，隨著動力平衡打破陸架波被釋放再次傳播，緯向上的壓強梯度力將會達到極值，此時黃海暖流達到峰值，故將滯后大風峰值時刻。 關于大風過程下的黃海暖流西偏過程，數(shù)值模式與理想數(shù)值試驗結果均顯示，，在大風過程期間，黃海暖流西向偏移至黃海西側陸架（大風爆發(fā)階段），并在黃海西側陸架上增強與衰減（大風衰退階段）。進一步的理論分析揭示了陸架波影響黃海暖流流軸位置的動力學機制。通過海盆北部的連續(xù)地形波導，海盆東側的陸架波可以將高水位傳入海盆西側，導致緯向壓強梯度力的極值位置也被向西推移，使得黃海暖流流軸發(fā)生西向偏移（因為黃海暖流在緯向上處于地轉平衡）。進一步研究發(fā)現(xiàn)海盆北部地形波導是否連續(xù)（即是否存在位勢渦度障礙）將決定黃海暖流是否西偏，底摩擦通過捕獲陸架波將影響逆風流的西偏程度。 關于大風過程下的渤黃海水交換過程，現(xiàn)場觀測以及數(shù)值模式結果均顯示，在大風爆發(fā)階段，渤海水位下降，海水從渤海流入黃海，在大風衰退階段，渤海水位回升，海水從黃海流入渤海，并且整個水交換過程伴隨著開爾文波的傳播調(diào)整。進一步的理論分析揭示了開爾文波影響渤黃海水交換的動力學機制。在大風爆發(fā)階段，朝鮮半島沿岸的開爾文波傳入渤海導致整個渤海海平面下降，使得海水從渤海流入黃海，開爾文波被捕獲在渤海海盆。在大風衰退階段，開爾文波被釋放而傳出渤海，整個渤海海平面上升，使得海水從黃海流入渤海。因此，旋轉效應下的開爾文波調(diào)整過程是影響渤黃海水交換的主要因素。
[Abstract]:In winter, there is a wide range of windy processes in the Yellow Sea and Bohai Sea. This paper focuses on the high frequency response of the circulation of the Yellow Sea and Bohai Sea to the windy weather in winter, including the delayed response of the Huang Hai warm current. The westward process of the Huang Hai warm current and the water exchange process of the Bohai Sea (Huang Hai), and the role of the synoptic scale Huang Hai shelf wave and Kelvin wave in the response process of the circulation in the Yellow Sea and Bohai Sea are studied. The results of field observation and numerical model show that the Huang Hai warm current is well responsive to the gale burst process, and the results of field observation and numerical model show that the response of Huang Hai warm current to the gale burst is very good. However, there is a lag in response time (formation lag and peak lag), and the response process of Huang Hai warm current is accompanied by the propagation of Huang Hai continental shelf waves. Further theoretical analysis reveals the dynamic mechanism of the delay response of the Huang Hai warm current caused by the continental shelf wave: the Huang Hai warm current is in geostrophic equilibrium at the latitudinal level, and the continental shelf wave adjusts the intensity of the Huang Hai warm current by adjusting the pressure gradient force in the zonal direction. In the gale burst stage, the induced continental shelf wave propagation can provide the upward pressure gradient force, and then the Huang Hai warm current can be formed, so it will lag behind the gale burst time, and in the gale recession stage, As the dynamic balance breaks the shelf wave is released and propagates again, the pressure gradient force will reach the extreme value, and the Huang Hai warm current will reach the peak value, so it will lag the peak moment of strong wind. The numerical model and ideal numerical test results show that, during the gale process, the Huang Hai warm current deviates from the west. The Huang Hai warm current shifts westward to the west shelf of Huang Hai (gale burst stage) and increases and attenuates on the west side of Huang Hai (gale recession phase). Further theoretical analysis reveals the dynamic mechanism of the influence of continental shelf waves on the position of the Huang Hai warm current axis. Through the continuous topographic waveguides in the northern part of the basin, the continental shelf waves on the east side of the basin can spread high water level to the west side of the basin, resulting in the extreme position of the zonal pressure gradient force also moving westward. The Huang Hai warm current axis is shifted westward (because the Huang Hai warm current is in geostrophic equilibrium at latitudes). It is further found that the continuity of topographic waveguides in the northern part of the basin (that is, the existence of potential vorticity barriers) will determine the westward deviation of the Huang Hai warm current, and the degree of westward deviation of the inverse wind current will be affected by the bottom friction through capturing the continental shelf waves. As to the exchange process of Bohai Sea and Yellow Sea under the strong wind, the field observation and numerical model results show that the Bohai Sea water level decreases during the gale burst stage, the seawater flows into Huang Hai from the Bohai Sea, and the Bohai Sea water level rises in the period of strong wind recession. Seawater flows from Huang Hai to the Bohai Sea, and the whole process of water exchange is adjusted by Kelvin wave propagation. Further theoretical analysis revealed the dynamic mechanism of Kelvin wave affecting sea water exchange in Bohai Sea and Yellow Sea. In the stage of strong wind burst, the Kelvin waves along the coast of the Korean Peninsula spread to the Bohai Sea, which caused the sea level to fall, which made the sea water flow from the Bohai Sea to Huang Hai, and the Kelvin wave was captured in the Bohai Sea basin. During the period of strong wind and recession, Kelvin wave was released and spread out to the Bohai Sea, and the sea level of the whole Bohai Sea rose, which caused the sea water to flow from Huang Hai into the Bohai Sea. Therefore, the adjustment process of Kelvin wave under rotation effect is the main factor affecting the sea water exchange between Bohai Sea and Yellow Sea.
【學位授予單位】：中國海洋大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P731.27;P732
本文編號：2190930
[Abstract]:In winter, there is a wide range of windy processes in the Yellow Sea and Bohai Sea. This paper focuses on the high frequency response of the circulation of the Yellow Sea and Bohai Sea to the windy weather in winter, including the delayed response of the Huang Hai warm current. The westward process of the Huang Hai warm current and the water exchange process of the Bohai Sea (Huang Hai), and the role of the synoptic scale Huang Hai shelf wave and Kelvin wave in the response process of the circulation in the Yellow Sea and Bohai Sea are studied. The results of field observation and numerical model show that the Huang Hai warm current is well responsive to the gale burst process, and the results of field observation and numerical model show that the response of Huang Hai warm current to the gale burst is very good. However, there is a lag in response time (formation lag and peak lag), and the response process of Huang Hai warm current is accompanied by the propagation of Huang Hai continental shelf waves. Further theoretical analysis reveals the dynamic mechanism of the delay response of the Huang Hai warm current caused by the continental shelf wave: the Huang Hai warm current is in geostrophic equilibrium at the latitudinal level, and the continental shelf wave adjusts the intensity of the Huang Hai warm current by adjusting the pressure gradient force in the zonal direction. In the gale burst stage, the induced continental shelf wave propagation can provide the upward pressure gradient force, and then the Huang Hai warm current can be formed, so it will lag behind the gale burst time, and in the gale recession stage, As the dynamic balance breaks the shelf wave is released and propagates again, the pressure gradient force will reach the extreme value, and the Huang Hai warm current will reach the peak value, so it will lag the peak moment of strong wind. The numerical model and ideal numerical test results show that, during the gale process, the Huang Hai warm current deviates from the west. The Huang Hai warm current shifts westward to the west shelf of Huang Hai (gale burst stage) and increases and attenuates on the west side of Huang Hai (gale recession phase). Further theoretical analysis reveals the dynamic mechanism of the influence of continental shelf waves on the position of the Huang Hai warm current axis. Through the continuous topographic waveguides in the northern part of the basin, the continental shelf waves on the east side of the basin can spread high water level to the west side of the basin, resulting in the extreme position of the zonal pressure gradient force also moving westward. The Huang Hai warm current axis is shifted westward (because the Huang Hai warm current is in geostrophic equilibrium at latitudes). It is further found that the continuity of topographic waveguides in the northern part of the basin (that is, the existence of potential vorticity barriers) will determine the westward deviation of the Huang Hai warm current, and the degree of westward deviation of the inverse wind current will be affected by the bottom friction through capturing the continental shelf waves. As to the exchange process of Bohai Sea and Yellow Sea under the strong wind, the field observation and numerical model results show that the Bohai Sea water level decreases during the gale burst stage, the seawater flows into Huang Hai from the Bohai Sea, and the Bohai Sea water level rises in the period of strong wind recession. Seawater flows from Huang Hai to the Bohai Sea, and the whole process of water exchange is adjusted by Kelvin wave propagation. Further theoretical analysis revealed the dynamic mechanism of Kelvin wave affecting sea water exchange in Bohai Sea and Yellow Sea. In the stage of strong wind burst, the Kelvin waves along the coast of the Korean Peninsula spread to the Bohai Sea, which caused the sea level to fall, which made the sea water flow from the Bohai Sea to Huang Hai, and the Kelvin wave was captured in the Bohai Sea basin. During the period of strong wind and recession, Kelvin wave was released and spread out to the Bohai Sea, and the sea level of the whole Bohai Sea rose, which caused the sea water to flow from Huang Hai into the Bohai Sea. Therefore, the adjustment process of Kelvin wave under rotation effect is the main factor affecting the sea water exchange between Bohai Sea and Yellow Sea.
【學位授予單位】：中國海洋大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P731.27;P732
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