臺風對西北太平洋葉綠素a濃度的影響

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本文關鍵詞：臺風對西北太平洋葉綠素a濃度的影響　出處：《廣東海洋大學》2016年碩士論文　論文類型：學位論文

【摘要】：臺風Sinlaku與Jangmi分別于2008年9月11日和27日先后經過臺灣島東部海域。本文利用衛(wèi)星遙感數據觀測到兩次連續(xù)臺風在不同初始環(huán)境條件下誘發(fā)了兩次不同程度的浮游植物增長。相對于強度更強移動速度更快的臺風Jangmi,慢移動的弱臺風Sinlaku在臺灣島東部誘發(fā)了一次更強的浮游植物增長(Sinlaku:Chl-a0.3 mg?m-3;Jangmi:Chl-a0.2 mg?m-3)。該結果顯示,移動速度是影響浮游植物增長的因素之一。其次,Sinlaku經過前存在的氣旋渦為上層海洋提供相對不穩(wěn)定的熱力學結構,Sinlaku經過后富含營養(yǎng)鹽的深層冷水更容易涌升到表層。而且,Sinlaku引起的混合層加深以及較深的真光層厚度為Jangmi經過后的浮游植物增長提供了不利條件。厚的混合層阻礙了Jangmi過后富含營養(yǎng)鹽的冷水上翻過程,從而產生了較弱的浮游植物增長。研究表明風的強迫作用(包括強度和移動速度)和臺風前的上層海洋環(huán)境條件(混合層深度、渦、營養(yǎng)鹽)在浮游植物增長過程中發(fā)揮重要作用。為了衡量臺風強迫作用和初始海洋環(huán)境條件對浮游植物增長的作用大小,文中我們介紹了一個影響參數。參數化結果表明,Sinlaku過后風的強迫作用更大�；谏鲜鲅芯�,我們進一步調查了2015年首個登陸粵西的強臺風彩虹在南海西北部誘發(fā)了大范圍浮游植物水華。研究結果表明,在粵西離岸海域,Ekman抽吸將次表層富含營養(yǎng)鹽的冷水輸送到上層海洋,促使真光層的營養(yǎng)鹽得到大量補充,誘發(fā)海洋表層浮游植物水華。海南島東部近岸海域,臺風彩虹引起的陸源營養(yǎng)鹽的地表徑流、近慣性振蕩、潮汐及離岸平流輸送的共同作用可能導致了該區(qū)域葉綠素a濃度的增加。通過統(tǒng)計分析海洋上層對2002到2009年夏季(6-9月)16個途經西北太平洋海域的熱帶氣旋的響應發(fā)現葉綠素濃度增長與Ekman抽吸和風應力時間積分呈正相關,相關系數分別達到0.87和0.76。混合層深度的變化與熱帶氣旋經過前混合層深度呈負相關,相關系數為0.46。該結果表明混合層的加深主要是風場強迫作用的結果。
[Abstract]:Typhoon Sinlaku and Jangmi passed through the eastern waters of Taiwan Island on September 11th 2008 and 27th respectively. In this paper, two successive typhoons were observed in different initial rings using satellite remote sensing data. Two times of phytoplankton growth were induced under environmental conditions. Typhoon Jangmi, which moved faster than the intensity of the typhoon. The slow-moving weak typhoon Sinlaku induced a stronger phytoplankton growth in the eastern part of the island, Sinlaku: Chl-a 0.3 mg? M-3 Jangmi: Chl-a 0.2 mg? The results show that the moving velocity is one of the factors that influence the growth of phytoplankton. Secondly, the gas vortex of Sinlaku provides a relatively unstable thermodynamic structure for the upper ocean. Deep cold water, which is rich in nutrients after Sinlaku passes, is more likely to surge to the surface. And. The deepening of the mixing layer caused by Sinlaku and the depth of the eoluminescent layer provide a disadvantage for the phytoplankton growth after the Jangmi passes. The thick mixed layer hinders the rich nutrition after the Jangmi. The cold water overturning of salt. This resulted in weak phytoplankton growth. Studies have shown that the forcing of wind (including intensity and moving velocity) and the conditions of the upper marine environment prior to typhoon (mixing layer depth, vortex). Nutrients) play an important role in phytoplankton growth. In order to measure the effect of typhoon forcing and initial marine environmental conditions on phytoplankton growth. In this paper, we introduce an influence parameter. The parameterization results show that the force of wind after Sinlaku is stronger. In 2015, we investigated the first strong typhoon rainbow landing in western Guangdong and induced a large range of phytoplankton Shui Hua in the northwestern part of the South China Sea. Ekman pumped the cold water rich in nutrients in the subsurface layer to the upper ocean, which promoted the nutrient supplement in the eoluminescent layer and induced the marine surface phytoplankton Shui Hua near the east coast of Hainan Island. Typhoon rainbow causes terrestrial nutrient surface runoff, near inertial oscillation. The combination of tide and offshore advection may lead to the increase of chlorophyll a concentration in the region. The response of 16 tropical cyclones passing through the Northwest Pacific Ocean showed that the increase of chlorophyll concentration was positively correlated with the Ekman suction and the time integral of wind stress. The correlation coefficients are 0.87 and 0.76 respectively. The variation of mixing layer depth is negatively correlated with the depth of the mixed layer before the tropical cyclone passes through. The correlation coefficient is 0.46. The results show that the deepening of the mixed layer is mainly the result of wind forcing.
【學位授予單位】：廣東海洋大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：P732.6

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