Global Change Effects on the Distribution of Nutrient in the ECS, NW Pacific and Kuroshio Seas (II):A Tidal-Biogeochemical Coupling Model

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Project title

Code/計畫編號

MOST104-2611-M019-015

Translated Name/計畫中文名

全球變遷對西北太平洋臺灣海域海洋生物地球化學與生態系統影響之長期觀測與研究(Ⅱ)---子計畫：全球變遷因子對東海及西北太平洋黑潮海域營養鹽分布之影響(Ⅱ)：潮流生地化耦合模式

Project Coordinator/計畫主持人

Hung-Jen Lee

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

黃世任
劉康克

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=11588299

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

619千元

ResearchField/研究領域

海洋科學
大氣科學
自然生態保育

東海、黃海及渤海的海水運動除受黑潮流的影響外，另受亞洲季節性變化的季風所驅動，強烈的季風使得淺水東海陸棚海域受到很大的影響。當冬季時因受強盛的西北及東北季風所驅動導致形成中國沿岸流，流經長江口並推動長江水舌往南移動；而夏季時受西南季風吹拂情況下，使長江水舌往東北方向擴散，根據Beardsley et al. (1985)研究指出既使長江淡水水舌分布在同一月份亦呈多樣性變化。研究長江水舌擴散分布最明顯的變化就是冬、夏時節之間的變化，而冬、夏季節最大不同的因子就是氣象變化，也就是風場的改變。本研究最主要的目的如前所述因長江的流量相當的大，每年約有928 km3/year 的淡水注入東海，同時也攜帶4.68×108頓的沙泥及大量的營養鹽進入東海，它對東海生地化基礎生產力的影響甚巨，吾人由歷年來LORECS所累積的水文資料中觀察到夏季長江水舌的分布，發現長江水舌有些年發生異常轉向南方擴散現象，而這現象是何因子導致的，探究其原因就是本研究的目的。The water motions of the three-sea system (East China, Yellow sea, and Bohai) are affected by the Kuroshio, and besides, are also driven by the seasonal Asian monsoon. In the shallow shelf area of the East China Sea, the water motion will be seriously influenced by the violent seasonal monsoon. Off the southeastern China, the strong seasonal northwest and northeast winds drive the coastal sea waters to form the so-called China Coastal Current (CCC) in winter, which passes right by the Changjiang River mouth and carries the brackish water flowing southward. In summer time, the southwesterly monsoon drives the Changjiang plume towards the northeast disposal normally. According to the study of Beardsley et al. (1985), they pointed out that the outline of the Changjiang plume disposal manifests different patterns, although in the similar month. To study the issue, the most difference of the plume disposal is in seasonal variations, i.e., winter-summer cyclically. And, the difference between in winter and summer is to have different wind fields, especially in wind direction. The purpose in the study as mentioned before is that Changjiang discharges over 928 km3 of water annually with carrying about 4.68×108 tons yr-1 of sediments and a large amount of nutrients into the East China Sea (ECS). It is an important influence to the marine productivity in the ECS. According to the historical data from the LORECS hydrographic collection, we find that the Changjiang Diluted Water anomaly turns its direction dispersing southward and extending to the southern ECS in summer sometimes.

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Global Change Effects on the Distribution of Nutrient in the ECS, NW Pacific and Kuroshio Seas (II):A Tidal-Biogeochemical Coupling Model

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