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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52868

Title: 南海北部(東沙島)乾沉降水溶性氮物種之研究
Water-soluble nitrogen in dry deposition in a remote island (Dongsha) of the northern South China Sea
Authors: Huang, Shih-Zhe
黃士哲
Contributors: NTOU:Department of Marine Environmental Informatics
國立臺灣海洋大學:海洋環境資訊系
Keywords: 南海;東沙;大氣懸浮微粒;氯虧損;氮通量;新生產力
South China Sea;Dongsha Island;Atmospheric aerosols;Chloride depletion;Nitrogen flux;New production
Date: 2018
Issue Date: 2020-01-20T06:20:30Z
Abstract: 本研究自2007年4月至2009年3月,於南海北部(東沙島)採集懸浮微粒樣本,共收集大氣總懸浮微粒樣本240組,並分析樣本中的主要離子及水溶性氮物種(water-soluble nitrogen species)。 結果顯示東沙島水溶性離子的濃度分佈呈現明顯的季節變化,在東北季風盛行季節(秋季至春季)較高,低值多出現於西南季風之季節(夏季)。水溶性總氮(water-soluble total nitrogen, WSTN)平均濃度217115 nmol m-3,其中水溶性無機氮(water-soluble inorganic nitrogen, WSIN)和水溶性有機氮(water-soluble organic nitrogen, WSON)之比例為60±15%:40±15%,平均濃度分別為13288和8546 nmol m-3。WSIN中銨鹽(ammonium, NH4+)和硝酸鹽(nitrate, NO3-)之比例為60±14%:40±14%,平均濃度分別為78.4±67.3和54.3±28.7 nmol m-3。 NH4+與nss-SO42-莫耳濃度之比值計算結果顯示東沙島海域之大氣有許多酸性物質輸入,主要是以NH4HSO4形式呈現。在所有的無機物種中,NaCl是水溶性無機離子主要的貢獻來源,大氣中Cl-和Na+莫耳濃度比值的估算結果顯示,東沙島在盛行東北季風之季節Cl-有明顯的虧損現象。 東沙島在研究期間NH4+與NO3-之通量分別為2.5±2.1 mmol m-2 yr-1及21±11 mmol m-2 yr-1,分別占WSIN之11%與89%。WSON(27±15 mmol m-2 yr-1)與WSIN(23±13 mmol m-2 yr-1)分別占WSTN之54%與46%。利用Redfield ratio中碳與氮的比值(6.625)來推算在東沙島之新基礎生產力,估計為0.52~0.81 mmol C m-2 day-1,約有5.58~8.74的新基楚生產力貢獻於南海北部之表層海洋(9.24 mmol C m-2 day-1)。
In this study, we collected and analyzed particulate aerosol samples from Dongsha Island, which is a remote island located north of the South China Sea (SCS). From April 2007 until March 2009, 240 total suspended particle (TSP) samples were collected over a 2-year period and were analyzed to examine the major ions and water-soluble nitrogen species. The concentrations of water-soluble ions in aerosols over the Dongsha Island show a strong seasonal variation which the relative high concentrations are found in northeast monsoon seasons (autumn to spring), and the low concentrations in southwest monsoon season (summer). The mean concentration of the water-soluble total nitrogen (WSTN) is 217±115 nmol m-3. The water-soluble inorganic nitrogen (WSIN) and water-soluble organic nitrogen (WSON) accounted for approximately 61±15% and 39±15% of the WSTN, with mean concentrations of 132±88 and 85±46 nmol m-3. The ammonium (NH4+) and nitrate (NO3-) accounted for 59±14% and 41±14% of the WSIN, with mean concentrations of 78.4±67.3 and 54.3±28.7 nmol m-3. The calculation results of molar ratios between NH4 and nss-SO42- reveal that the atmosphere over the study area suffer from heavy acidic ion species. The compound of sulfate in aerosol is probably in the form of NH4HSO4. Among all the inorganic species, sea salt (NaCl) is a major contributor to the water-soluble inorganic ions, the evaluation of Cl-/Na+ ratios in aerosols indicates a strong chloride deficient under the northeast monsoon seasons. Regarding the dry deposition fluxes, the NH4+ (2.5±2.1 mmol m-2 yr-1) and NO3- (21±11 mmol m-2 yr-1) accounted for 11% and 89% of the WSIN, respectively, and the WSON (27±15 mmol m-2 yr-1) and WSIN (23±13 mmol m-2 yr-1) accounted for 54% and 46% of the WSTN, respectively. Using the ratio of carbon and nitrogen in the Redfied ratio (6.625), we estimated that the new production at Dongsha Island (0.52~0.81 mmol C m-2 day-1) which can contribute 5.58~8.74% of new production in the surface water of northern South China Sea (9.24 mmol C m-2 day-1).
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010581005.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52868
Appears in Collections:[海洋環境資訊系] 博碩士論文

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