Effects of Global Change on Ocean Biogeochemistry and Ecosystems in the Seas Surrounding Taiwan in the Northwest Pacific (Ii): Modeling Studies Of? ?Soluble Iron and the Aerosol Acid Reactions (3)

View Statistics Email Alert RSS Feed

Information

Details

Project title

Code/計畫編號

MOST106-2611-M019-021

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水溶性鐵與大氣顆粒酸性反應影響的模擬分析 (Ⅲ)

Project Coordinator/計畫主持人

Fu-Jung Tsai

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Marine Environmental Informatics

Website

https://www.grb.gov.tw/search/planDetail?id=12228993

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

01-07-2018

Bugetid/研究經費

796千元

ResearchField/研究領域

海洋科學

"在全球的⼤洋⾯上，鐵為限制性營養鹽的其中⼀種，影響到浮游植物的⽣⾧。⽽在亞洲的東北季⾵期間，常會有沙塵事件，為90%以上⼤氣中鐵的來源。沙塵事件除了攜帶沙塵顆粒與各種地殼相關營養鹽之外，也常有污染物伴隨⽽來，酸性污染物如硫酸鹽、硝酸鹽也跟隨這些沙塵顆粒前來，這些⼤氣中的酸性污染物附著在沙塵顆粒上可改變沙塵中的化學性質，使原本沙塵顆粒上的三價鐵轉換成可溶性的兩價鐵，⽽這些⽔溶性鐵才能為浮游植物所利⽤吸收。為了了解沙塵顆粒中鐵營養鹽的化學反應，正確推估⽔溶性鐵等營養鹽濃度改變的情形，進⽽定量其沉降⾄海⾯後對浮游植物的影響，本計劃擬於區域性的⼤氣顆粒與沙塵模式中加⼊酸性反應的機制，模擬沙塵顆粒上⾯三價鐵轉換成兩價鐵的機制，並挑選合適的個案，計算在⼤氣中沙塵顆粒表⾯的酸性反應導致顆粒中⽔溶性鐵的濃度增加情形以及其沉降⾄海⾯的多寡，並⽐對觀測與模式中的總鐵與⽔溶性鐵的濃度，確認模式的計算結果，以探討這些⼤氣沉降⽔溶性鐵對台灣及西北太平洋附近海域浮游植物的影響。由於海洋中的⽣物作⽤與各種過程複雜，探討了解營養鹽在海⽔中的循環過程常有很⼤的困難度，相對⽽⾔，⼤氣營⼒卻是影響海洋⽣態環境的過程中較容易定量的因⼦，因此本計劃擬接續上⼀期的計畫，完成探討沙塵中的⽔溶性鐵的反應與對海洋的輸⼊量，進⽽在未來逐步定量⼤氣來源的影響。" "On the global ocean surface, iron is one of the limited nutrient to affect the growth of phytoplankton. Over the Asia, dust events often occur during the northeasterly monsoon, which provide 90% of source for atmospheric iron. In addition to the dust particles that come along during the events, pollutants can also come in accompany with the particles. The acid pollutants attached on the dust particles can change the chemical component of the dust particles, and turn the trivalent iron in the dust particles into two-valent iron, which is bioavailable. In order to estimate the chemical reactions of iron in the dust particles, and to quantify the change of the soluble iron, and their impacts on the phytoplankton, this project intends to add the acid reaction mechanism inside the regional aerosol and dust model, and then find proper cases to calculate the change of the soluble iron due to the reactions. The deposition of the soluble iron on the sea surface, and the effect of the change of nutrient on the phytoplankon will also be quantified. Since the physical and chemical processes of nutrients in the marine is relatively complex, quantification of the contribution of these process is quite difficult. On the other hand, the atmospheric force is a simpler process to estimate. Thus, following the previous project, this project intends to finish quantifying the contribution of soluble iron and their input to the ocean. In the future, hopefully the contribution of the atmosphere will be quantified step by step."

Keyword(s)

⽔溶性鐵
酸性反應
⼤氣顆粒
模式

DSpace CRIS

Effects of Global Change on Ocean Biogeochemistry and Ecosystems in the Seas Surrounding Taiwan in the Northwest Pacific (Ii): Modeling Studies Of? ?Soluble Iron and the Aerosol Acid Reactions (3)

Details

Description