English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40649
Visitors : 639565      Online Users : 60
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40891

Title: CO2 system in the oligotrophic northwest Pacific Ocean during the Asian dust storm season
Authors: Wen-Chen Chou;Gwo-Ching Gong;Wei-Jun Cai;David.D. Sheu;Chin-Chang Hung;Hung-Yu Chen;Chih-Ching Chung
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Keywords: CO2;Dust storm;North Pacific;Oligotrophic
Date: 2011-12-20
Issue Date: 2017-02-07T03:51:06Z
Publisher: Marine Chemistry
Abstract: Abstract:To explore the effect of atmospheric forcing on the CO2 system in the subtropical northwest Pacific Ocean, which is oligotrophic and nitrogen limited, total alkalinity (TA), dissolved inorganic carbon (DIC), fugacity of CO2 (fCO2), and other pertinent data (i.e. temperature, salinity, and concentrations of nitrate and chlorophyll a (Chl a)) were collected from 7 cruises during the spring Asian dust storm (ADS) periods of 2007 and 2008. In contrast to the reported substantial fCO2 decrease following dissolved iron addition in the “high-nutrient-low-chlorophyll” region during the mesoscale iron enrichment experiments, the present results show that no significant drawdown of fCO2 was found following an ADS event, despite the fact that an approximately 3-fold increase of Chl a was observed. This may be attributed to the fact that nutrients from the wind-induced entrainment of subsurface water, rather than atmospheric deposition, were the major source stimulating biological production. The entrained nitrate not only comes with it high CO2 but also may have rendered an unfavorable environmental condition for nitrogen fixers to compete with other picophytoplanktons. Consequently, even if the Fe and/or P deposition may have increased, nitrogen fixation, a mechanism favoring CO2 sequestration in the oligotrophic region, cannot take place during the ADS period. A model simulation further confirms that the increase of fCO2 caused by CO2 inputs from the subsurface water can nearly be compensated for by the fCO2 decrease resulting from the accompanying cooling effect and the enhancement of biological production. Accordingly, although a previous study revealed that the elevated biological production may enhance particulate organic carbon export during the ADS period, our results suggest that it may not contribute much to the sequestration of atmospheric CO2 in the oligotrophic subtropical northwest Pacific Ocean. Our work further suggests that sea surface TA and perhaps DIC can be predicted from salinity in this low production area.
Relation: 127(1-4), pp.210–222
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40891
Appears in Collections:[海洋環境與生態研究所] 期刊論文

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback