Effects of Environmental Changes on Atmospheric Chemical Transport and the Associated Modeling Study in the East China Sea

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Project title

Code/計畫編號

NSC98-2611-M019-019-MY3

Translated Name/計畫中文名

東海長期觀測與研究(IV)---子計畫---大氣物質傳播與環境變遷數值模式之發展

Project Coordinator/計畫主持人

Fu-Jung Tsai

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

許世傑

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=1893485

Year

2009

Start date/計畫起

01-08-2009

Expected Completion/計畫迄

01-07-2010

Bugetid/研究經費

1327千元

ResearchField/研究領域

海洋科學
大氣科學

"東海位於中國大陸的邊緣，受到大陸所排放的大氣天然與人為污染物的嚴重影響，近年來中國大陸工業快速成長，這些排放物種所提供的大氣營養鹽對東海海洋生地化的現象可能造成無法輕忽之衝擊，然而截至目前為止東海的乾濕沈降量資料缺乏，尤其其中濕沈降可佔總沈降量的60%以上，但觀測與模擬資料卻極少。因此大氣物質所提供的營養鹽在乾濕總沈降量上的評估目前仍是個爭議性問題，之前一些研究認為大氣的輸入量可與河流相當，但也有學者持相反意見，大氣營養鹽對海洋生產力的影響目前更是無法定論。本研究擬採用東亞的區域性大氣模式(TAQM)模擬估算長時期的大氣沈降營養成分在東海的分布，定量了解大氣的輸入量及其對海洋生產力的影響。TAQM 大氣模式由美國引進，於台灣的大氣與環境領域已應用多年，與環境觀測分析也有很好的結果，因此適合應用於探討東海的大氣沈降營養成份分析。另外，除了模式模擬，本研究也將進行東海的乾濕沈降量觀測，於研究船上架設大氣乾濕總沈降的沈降桶，長期觀測大氣總沈降量，配合模式分析了解東海大氣營養成份的總沈降量及對海洋生產力可能的影響。本計畫預期以三年時間分階段完成大氣乾濕沈降量模式輸出的程式編寫，配合研究船上乾濕沈降量筒的觀測，校正沈降程式，以更趨近於實際觀測值，校正模式後並完成近三年長時期大氣沈降營養成份的模擬，並配合整合型計畫的其他觀測結果，實際探討大氣沈降量對東海生地化的影響。" "East China Sea is the marginal sea of China. It is significantly affected by the emissions of atmospheric natural and anthropogenic chemicals from China. Recently, China’s rapid industrialization and the resulting change of atmospheric inputs of marine nutrients can affect the biogeochemistry of East China Sea in an irreversible way. The importance of atmospheric dry and wet depositions to the biogeochemistry of East China Sea is non-negligible. In particularly, the wet depositions can account for up to 60% of the total depositions, but the data are scarce over East China Sea. Thus, the magnitude of atmospheric inputs and their impacts remains unknown. Some of the previous studies suggest that the nutrient inputs to the sea from atmosphere approximately equal the amount of inflow from rivers, but others are in the contrary. As a result, the impacts of atmospheric inputs to the marine biogeochemistry are still an issue under debate. In this study, we intent to use the regional atmospheric chemistry and aerosol model – TAQM, covering East Asia, to estimate the long term atmospheric inputs of marine nutrients. Through this study, their distributions over East China Sea can be quantified and the impacts of these nutrients to the marine biogeochemistry can be estimated. TAQM is modified from an atmospheric chemistry model originally used in the USA. It has been applied to modeling the atmospheric chemistry and aerosol concentrations over East Asia during the past decade and the results were reasonably well in comparison with observations. Thus, the same model is applied in this study to estimate the atmospheric inputs of marine nutrients over East China Sea. In addition to the modeling work, total deposition measurements will also be performed during this study. The long-term total depositions will be collected by a deposition tank on board the research vessel. In this study, the modeling results are compared with the observations, and the results of atmospheric input of marine nutrients are quantified and their impacts on the marine biogeochemistry are estimated. This study intent to accomplish both the atmospheric modeling studies and measurements of dry and wet depositions in a span of three years, including editing the code, set up the total deposition tank, modifying the deposition codes according to the measurements and calculating the 3 years of dry and wet depositions. It is believed that the results can be use to quantify the magnitude of atmospheric inputs of marine nutrients as well as to estimate the impacts of atmospheric inputs to the marine biogeochemistry."

Keyword(s)

乾濕沈降量
營養成份
區域性大氣模式
dry and wet depositions
marine nutrients
regional atmospheric model

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Effects of Environmental Changes on Atmospheric Chemical Transport and the Associated Modeling Study in the East China Sea

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