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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Increased net CO2 outgassing in the upwelling region of the southern Bering Sea in a period of variable marine climate between 1995 and 2001
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Increased net CO2 outgassing in the upwelling region of the southern Bering Sea in a period of variable marine climate between 1995 and 2001

机译:在1995年至2001年间海洋气候变化时期,白令海南部上升流地区的净二氧化碳排放量增加

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We investigated seasonality and interannual variability of the surface water pCO2 (pCO2sw) and sea-air CO2 fluxes in the upwelling region of the southern Bering Sea (53°N to 55°N, 174°E to 194°E). Data of surface water and atmospheric pCO2, sea surface temperature and salinity were based on automated measurements on board cargo ships for 6 years (1995–2001). We observed a significant interannual trend towards more CO2 supersaturated surface water relative to the atmosphere. From linear regression of seasonally detrended data we obtained an annual pCO2sw increase of 6.5 ± 1.4 μatm yr?1 and 11 ± 1.9 μatm yr?1 in the basin and shelf slope, respectively. This was higher than the observed pCO2air increase (between 0.47 ± 0.28 and 0.96 ± 0.62 μatm yr?1), indicating the importance of other processes than oceanic CO2 uptake from the atmosphere to explain the pCO2sw increase. Sea surface temperature and salinity showed a trend towards cooler and more saline conditions. We estimated large interannual variability of net annual oceanic CO2 outgassing, with low CO2 outgassing in years before 1998 (<1 mol m?2 yr?1), increasing to a maximum of 4.5 mol m?2 yr?1 in 2000. Highest net CO2 outgassing was observed in the relatively cold years of 1999 and 2000, whereas the exceedingly warm year 1997 showed four times lower CO2 flux to the atmosphere. Interestingly, we found close coupling between the net CO2 outgassing and biological production; years with less net CO2 outgassing coincided with high biological CO2 drawdown, especially evident in 1997.
机译:我们调查了白令海南部上升流地区(53°N至55°N,174°E至194°E)的地表水pCO2(pCO2sw)和海洋空气CO2通量的季节性和年际变化。地表水和大气中的pCO2,海面温度和盐度的数据是基于对货船6年(1995-2001年)的自动测量得出的。我们观察到一个明显的年际趋势,即相对于大气,更多的CO2过饱和地表水。根据季节性趋势数据的线性回归,我们得出盆地和陆架坡度的pCO2sw年度增加分别为6.5±1.4μatmyr?1和11±1.9μatmyr?1。这高于观察到的pCO2空气增加(在0.47±0.28和0.96±0.62μatmyr?1之间),表明除了从大气中吸收海洋CO2以外的其他过程对于解释pCO2sw的增加也很重要。海表温度和盐度显示出趋向凉爽和盐碱化的趋势。我们估计海洋年净CO2排放量存在较大的年际变化,在1998年之前的几年中CO2排放量较低(<1 mol m?2 yr?1),到2000年增加到最大4.5 mol m?2 yr?1。在1999年和2000年相对寒冷的年份中观察到了CO2释放气体,而在1997年极其温暖的年份中,向大气中的CO2通量降低了四倍。有趣的是,我们发现净二氧化碳排放与生物生产之间存在紧密的联系。年,净二氧化碳排放量较少,而生物二氧化碳的排放量较高,这在1997年尤为明显。

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