原名「台灣學術線上」
包含TAO期刊庫 + TAO書籍庫 + 論文 + 史料文獻
首頁 | 關於TAO | 瀏覽 | 進階查詢 | 參考工具 | 會員服務 | 已購專書 | RSS服務 | 電子報 | FAQ  
查詢範圍:
   
查詢模式:
熱門查詢詞:
dvd臺灣農村規劃的在地美閱讀臺灣
   
   
   
     
   
 
項次 書目
1
題名:Th-234 Scavenging in the Water Column off Southwestern Taiwan    
台灣西南海域水體中T-234的清除作用
著者:Chin-Chang Hung(洪慶章) ;Ching-Ling Wei(魏慶琳)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:3卷2期(1992.6)
頁碼:183-197
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

本研究於台灣西南海域選擇一測站(22°25'N 120°08'E),採集海水以量測溶解相及顆粒相釷─234。自垂直剖面觀之,釷─234在透光層主要是受生物活動,深層則是被再懸浮顆粒所清除。於透光層中,由盒子模式計算溶解相與顆粒相釷─234之停留時間分別?90-110天和12-28天;並據以推算釷-234在透光層底部的通量?1220 dpm m-2d-1。從顆粒的外形鑑定,顯示深層及底層之顆粒體?水平方向傳送過來之再懸浮顆粒組成,但難以定量。再懸浮顆粒體?一有效之釷─234清除者,造成深層水中釷─234和鈾─238之不平衡。在深層水中,溶解相和顆粒相釷─234之停留時間分別?112天和27天。我們估計釷─234進入沈積物中之最低能量?1600 dpm m-2d-1
A station off southwestern Taiwan (22°25'N 120°08'E) was selected to carry out detailed seawater sampling for the measurements of dissolved and particulate 234Th. The profiles showed that 234Th is subject to scavenging and removal processes by biological particles in the euphotic zone and by resuspended particles in the deep layer. Estimated by box-model, the residence times of dissolved and particulate 234Th in the euphotic layer are in the ranges of 90-110 days and 12-28 days, respectively. A vertical 234Th flux of 1220 dpm m-2 d-1 out of the euphotic layer is estimated. Horizontal transport of resuspended particles in the deep and bottom layer is evident based on morphological examination of particles but is difficult to quantify. Resuspended particles act as an effective scavenger for Th in the deep layer and cause a radioactive disequilibrium of 234Th with respect to its progenitor, 238U. Residence times of dissolved and particulate 234Th in this layer are 112 days and 35 days, respectively. A lower limit of 234Th flux of 1600 dpm m-2 d-1 into the bottom sediment can be estimated.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 3卷2期 (1992.6)
Compression Studies of Single-Crystal SnO2 and PbO2 in a Diamond Cell/ Eugene HuangAlice S. LiShu-Cheng Yu
A Study of the True Height Analysis Methods/ J. Y. LiuS. L. Wu
Evaluation of Galai CIS-1 for Measuring Size Distribution of Suspended Primary Particles in the Ocean/ Cheng-Han TsaiSu-Ren Rau
Measurement of Dissolved Organic Carbon in Seawater: a Comparison between the High-Temperature Catalytic Oxidation Method and the Persulfate Oxidation Method/ Jia-Jang HungWei-Ann Chang
Th-234 Scavenging in the Water Column off Southwestern Taiwan/ Chin-Chang HungChing-Ling Wei
Effect of Equatorial Long Waves on the North Equatorial Countercurrent/ T. Y. TangY. J. YangMiug-Chin Wu
 
   
 
   

與TAO合作 | 隱私與版權聲明 | 聯絡方式 | 下載Adobe Reader
地址:台北市中正區(100)北平東路30-12號3樓
電話:(02)2393-6968 傳真:(02)2393-6877
Email: service@wordpedia.com
Wordpedia Family: 學校、企業版入口 | 遠流影音館
Copyright©2011 Wordpedia Co., Ltd. All Rights Reserved.