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  本文關(guān)鍵詞：黃渤海一氧化碳的分布及源匯研究　出處：《中國海洋大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 渤海 黃海 一氧化碳 分布 源匯

【摘要】：一氧化碳(CO)是大氣中重要的痕量氣體,能夠和對流層中主要的氧化劑羥基自由基反應(yīng),影響大氣中很多化學(xué)活性氣體的濃度,被認(rèn)為是一種間接溫室氣體。海洋是大氣中CO的一個重要來源,因而開展海洋中CO的生物地球化學(xué)研究具有重要意義。本論文以中國典型的陸架海域——黃渤海為研究海域,系統(tǒng)地研究了黃渤海春季(2012年5月1日-22日)、夏季(2011年6月13日-30日)、秋季(2010年9月8日-22日)和冬季(2012年11月1日-21日,實(shí)際上是秋末冬初,為比較季節(jié)變化稱為冬季)4個季節(jié)CO的時空分布特征和表層源匯過程,并對黃渤海表層海水中CO源匯做了平衡估算。本論文主要研究結(jié)果如下：(1)黃渤海上空大氣中CO具有明顯的時空分布特征,渤海4個季節(jié)平均[CO]atm為572ppbv,高于黃海4個季節(jié)平均值(497 pbv)。從季節(jié)上看,渤海[CO]atm按照秋季、冬季、夏季、春季依次降低；而黃海[CO]atm按照秋季、春季、夏季、冬季次序降低,黃渤海均表現(xiàn)為秋季[CO]atm最高。從不同海域來看,渤海在夏季、秋季和冬季均高于黃海,春季低于黃海。(2)黃渤海表層海水中CO的濃度具有明顯的時空分布特征,渤海4個季節(jié)平均[CO]surf為1.89 nmol L-1,與黃海4個季節(jié)平均值(1.82 nmol L-1)基本相同。從季節(jié)上看,渤海[CO]surf按照夏季、春季、秋季、冬季依次降低；而黃海[CO]surf按照春季、夏季、秋季、冬季次序降低；黃渤海均是春夏[CO]surf偏高,秋冬季偏低,冬季最低。從不同海域來看,夏秋季渤海[CO]surf高于黃海,春冬季黃海[CO]surf高于渤海。(3)黃渤海CO具有明顯的周日變化。CO濃度最高值出現(xiàn)在正午之后,最低值出現(xiàn)在凌晨左右。黃渤海CO具有明顯的垂直分布特征,一般來說CO濃度呈現(xiàn)表層高,隨深度增加逐漸降低,到一定深度基本保持不變,個別站位底層CO略有增加。(4)黃渤海表層海水CO相對于其上空大氣是過飽和的,是黃渤海上空大氣中CO的源。從不同海域來看,冬季渤海為其上空大氣中CO的匯,其余季節(jié)為源,黃海四個季節(jié)均為源。黃渤海海-氣通量具有明顯的時空變化。從季節(jié)上看,渤海CO海-氣通量按照夏季、春季、秋季、冬季次序降低,黃海按照春季、夏季、秋季、冬季依次降低;總的來說黃渤海CO海-氣通量春夏季高,秋冬季低,冬季最低。從不同海域來看,夏季渤海CO海-氣通量高于黃海,春季、秋季和冬季渤海CO海-氣通量均低于黃海。(5) 黃渤海表層海水CO的來源有光化學(xué)生成、暗反應(yīng)生成和藻類釋放。其中有色溶解有機(jī)物的光化學(xué)降解為主要來源,且CO光致生成速率具有明顯的季節(jié)變化,按照夏季、春季、秋季、冬季次序降低。黃渤海表層海水CO的匯有海-氣擴(kuò)散和微生物消費(fèi),其中微生物消費(fèi)為主要的匯。黃渤海微生物消費(fèi)速率也存在明顯的季節(jié)變化,按照夏季、春季、秋季、冬季依次降低。本論文計算表明,黃渤海表層海水CO的源為56.9-74.6 Gg CO-C yr-1,匯為66.1 Gg CO-C yr-1源匯基本持平,符合海洋穩(wěn)態(tài)理論。
[Abstract]:Carbon monoxide (CO) is an important trace gas in the atmosphere, and the main oxidant hydroxyl radical reactions in the troposphere, affect the atmospheric concentrations of many chemical reactive gases, is considered to be an indirect greenhouse gas. The ocean is an important source of CO in the atmosphere, because of the biological geochemistry research carried out in the ocean CO is of great significance. In this paper, shelf China typical - Huang Bohai as the research area, systematic study of the yellow spring in Bohai (-22 May 1, 2012), summer (June 13, 2011 -30), autumn (September 8, 2010 -22) and winter (November 1, 2012 -21, in the late autumn and early winter, in order to compare the seasonal variation of said for the winter 4 season) CO spatial distribution characteristics and surface source process, and the Bohai yellow CO in the surface waters of the source sink balance estimates. In this thesis, the main results are as follows: (1) Huang Bohai In the atmosphere above CO has obvious temporal and spatial distribution characteristics of Bohai, the 4 season average [CO]atm was 572ppbv higher than that of the Yellow Sea, the 4 season average value (497 PBV). From the point of the season, Bohai [CO]atm in autumn, winter, spring and summer, decreasing; the Yellow Sea [CO]atm according to spring, summer, autumn and winter in order to reduce. Huang Bohai showed the highest [CO]atm in autumn. From different waters, Bohai in the summer, autumn and winter were higher than that of the Yellow Sea, spring than the Yellow Sea. (2) had obvious temporal and spatial distribution characteristics of CO concentration in surface waters of Huang Bohai, Bohai for 4 seasons, the average [CO]surf is 1.89 nmol L-1, and the Yellow Sea 4 seasons average (1.82 nmol L-1) is basically the same. From the point of the season, Bohai [CO]surf in spring, summer, autumn and winter were decreased; and the the Yellow Sea [CO]surf in spring, summer, autumn, winter order reduced; Huang Bohai is spring and summer [CO]surf High and low in autumn and winter, lowest in winter. From different waters, summer and autumn in spring and winter in Bohai [CO]surf is higher than that in the Yellow Sea, the Yellow Sea [CO]surf is higher than that of Bohai. (3) Huang Bohai CO on Sunday with the change of.CO concentration obviously the highest value appeared at noon, the lowest in the morning. Huang Bohai CO has the obvious vertical distribution. General CO concentration showed a high surface, gradually decreased with the increasing of depth, to a certain depth remained unchanged, and some sites underlying CO increased slightly. (4) Huang Bohai CO relative to the atmosphere over the sea surface is saturated, Huang Bohai in the atmosphere above CO source. From different sea view, Bohai is the winter sky the atmospheric CO sink, the rest of the season as the source of the Yellow Sea's four season was the source. The Yellow Bohai sea air flux has obvious spatial-temporal change. From the point of the season, the Bohai CO air sea flux in summer, spring, autumn, winter In order to reduce the season, according to the the Yellow Sea spring, summer, autumn and winter are lower; General Huang Bohai CO air sea fluxes in spring and summer, autumn and winter, lowest in winter. From different waters, in summer in Bohai CO air sea flux is higher than that of the Yellow Sea, spring, autumn and winter in Bohai CO air sea fluxes were below the Yellow Sea. (5) source of photochemical generation of Huang Bohai CO in the surface seawater, dark reaction and release of algae. The photochemical degradation of colored dissolved organic matter as the main source, and CO light induced generation rate has obvious seasonal variation, in spring, summer, autumn, winter order reduced. Yellow Bohai sea surface CO the exchange has sea air diffusion and microbial consumption, including microbial consumption as the main sink. Huang Bohai microbial consumption rate has obvious seasonal variation, in spring, summer, autumn and winter were reduced. The calculation results show that, Huang Bohai The surface water source for the 56.9-74.6 CO Gg CO-C yr-1, 66.1 Gg CO-C yr-1 source sink was essentially flat, with ocean steady state theory.

【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：P732;P734

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