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Title: Seasonal variability of carbon chemistry at the SEATS time-series site, Northern South China Sea Between 2002 and 2003
Authors: Wen-Chen Chou;David Der-Duen Sheu;Chen-Tung Arthur Chen;Shu-Lun Wang;Chun-Mao Tseng
Contributors: 國立臺灣海洋大學:海洋環境化學與生態研究所
Date: 2005-06
Issue Date: 2017-02-07T07:22:15Z
Publisher: Atmospheric and Oceanic Sciences
Abstract: Abstract:Analyses of total carbon dioxide (TCO2 ) and titration alkalinity (TA) in the mixed-layer was performed approximately bimonthly at the SEATS time series site (18¢X15¡¦N, 115¢X35¡¦E) in the northern South China Sea (SCS) from March 2002 to April 2003. These measurements and the calculatedfCO 2 were then used to document their seasonal variations and to estimate the seasonal air-sea flux of CO2 during the observed period at the site. Results show that the normalized TCO2 ( NTCO2 = TCO2 x 35/S) fluctuates seasonally between ~1972 and ~1997 _?¿mol kg−1 , with the highest value in winter. The decline of NTCO2 in spring-summer mainly results from in situ biological utilization, while the resurgence of NTCO2 in fall-winter is due to entrainment of the TCO2-rich subsurface waters from below. TA varies from ~2190 to ~2220 _?¿mol kg −1 in tandem with salinity, suggesting the prime control of physical processes. fCO2 increases progressively from spring to summer, reaches a maximum in July (~382 _?¿a decreases from fall to winter to a minimum (~347 _?¿atm) in January with an amplitude of ~35 _?¿atm. The seasonal variability of fCO2 is in phase with temperature changes but is inversely correlated with the fluctuation of NTCO2 , suggesting that the fCO2 seasonality is primarily controlled by temperature changes, though other factors have compensated partially to yield the observed low amplitude of its variability. The sea-to-air CO2 fluxes for spring, summer, fall and winter are estimated to range from 0.00 ¡__n0.01 to -0.02 ¡__n0.05, +0.03 ¡__n0.01 to +0.23 ¡__n0.06, +0.18 ¡__n0.10 to +0.45 ¡__n0.25, and -0.62 ¡__n0.20 to -1.42 ¡__n0.46 molC m year −2 −1 , respectively. Throughout the year, the annual flux is calculated to be -0.11 ¡__n0.08 ~ -0.23 ¡__n0.18 molC m year −2 −1 during the observed period. Furthermore, although there is a drawdown of NTCO2 of ~25 _?¿mol kg −1 from winter to summer, which implies a net community production of 6.80 ¡__n0.77 mmolC m ye8722;1 in the mixed layer at the SEATS site, there is no corresponding change of nitrate observed, suggesting other sources of nitrogen required to sustain the new production.
Relation: 16(2), pp.445-465
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40952
Appears in Collections:[Institute of Marine Environment and Ecology] Periodical Articles

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