Seasonal and interannual variability of sea-surface carbon dioxide species at the European Station for Time Series in the Ocean at the Canary Islands (ESTOC) between 1996 and 2000 -: art. no. 1076
Seasonal and interannual variability of sea-surface carbon dioxide species at the European Station for Time Series in the Ocean at the Canary Islands (ESTOC) between 1996 and 2000 -: art. no. 1076
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DOI：
10.1029/2002gb001993
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发表时间：
2003-07-15
影响因子：
5.2
通讯作者：
González-Dávila, EF
中科院分区：
文献类型：
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作者：
González-Dávila, M;Santana-Casiano, JM;González-Dávila, EF
[1]在位于东北大西洋副热带环流加那利群岛（ESTOC）的欧洲海洋时间序列站（European Station for Time Series in the Canary Islands，简称ESTOC），通过每月一次的巡航测量了地表水的水文季节特征、CO2分压、fCO(2)、pH(t)、总碱度、A(t)、总溶解无机碳、C-T、养分和叶绿素A。利用从1996年开始的5年多的海洋资料，确定了CO2种类的季节和年际变化趋势以及CO2的海气交换。净CO2通量表明，该地区是一个次要的CO2源，平均放出值为179 mmol CO2 m(-2) yr(-1)，主要受5 - 8月吹的信风控制。短期风变率对CO2通量的影响已通过在6小时采样频率下增加63%的海气通量得到解决。控制每月碳- t变化的过程已经确定。从3月到10月，当CT减小时，混合层底部的混合（11.5 +/- 1.5 mmol m(-3)）被海气交换补偿，估计净有机产量为25.5 +/- 5.7 mmol m（-3）。从年尺度上看，3 - 10月无机碳的减少主要由生物减少引起，而10月至秋末碳- t的增加主要由混合过程控制。去除季节性变率后，fCO（2sw）以0.71 +/- 5.1 μ mol / kg /年（-1）的速率增加，无机碳作为对大气趋势的响应，以0.39 +/- 1.6 μ mol / kg /年(-1)/年（-1）的速率增加。
[1] Seasonal patterns in hydrography, partial pressure of CO2, fCO(2), pH(t), total alkalinity, A(T), total dissolved inorganic carbon, C-T, nutrients, and chlorophyll a were measured in surface waters on monthly cruises at the European Station for Time Series in the Ocean at the Canary Islands (ESTOC) located in the northeast Atlantic subtropical gyre. With over 5 years of oceanographic data starting in 1996, seasonal and interannual trends of CO2 species and air-sea exchange of CO2 were determined. Net CO2 fluxes show this area acts as a minor source of CO2, with an average outgassing value of 179 mmol CO2 m(-2) yr(-1) controlled by the dominant trade winds blowing from May to August. The effect of short-term wind variability on the CO2 flux has been addressed by increasing air-sea fluxes by 63% for 6-hourly sampling frequency. The processes governing the monthly variations of C-T have been determined. From March to October, when CT decreases, mixing at the base of the mixed layer (11.5 +/- 1.5 mmol m(-3)) is compensated by air-sea exchange, and a net organic production of 25.5 +/- 5.7 mmol m(-3) is estimated. On an annual scale, biological drawdown accounts for the decrease in inorganic carbon from March to October, while mixing processes control the C-T increase from October to the end of autumn. After removing seasonality variability, fCO(2sw) increases at a rate of 0.71 +/- 5.1 muatm yr(-1), and as a response to the atmospheric trend, inorganic carbon increases at a rate of 0.39 +/- 1.6 mumol kg(-1) yr(-1).