Diel variability of glycolate in the eastern tropical Atlantic Ocean
Diel variability of glycolate in the eastern tropical Atlantic Ocean
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DOI：
10.1016/s0967-0637(97)00090-3
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发表时间：
1997-12-01
影响因子：
2.4
通讯作者：
Descolas-Gros, C
中科院分区：
文献类型：
--
作者：
Leboulanger, C;Oriol, L;Descolas-Gros, C
用高效液相色谱法测定了1992年6月欧美利4号海洋巡航期间热带大西洋东部海水中溶解乙醇酸的浓度。乙醇酸的日浓度在中营养化水体达到74mU g 1(-1)，在贫营养水体达到17mU g 1(-1)。中午，溶解的乙醇酸总量超过每立方米海洋1克碳，夜间急剧下降(不到0.1克碳每立方米)。在所研究的三个站点中，水柱中乙醇酸碳的昼夜差异与通过合并(CO2)-C-14估算的日初级生产量具有相同的量级。这种化合物在夜间消失表明异养生物的快速消耗。这些数据表明，浮游植物的乙醇酸排泄可能是重要的，并可能受到周围营养物质浓度的影响。此外，由于乙醇酸盐占每日生产力的50%，我们对二氧化碳生物总减少量的估计需要重新审查。版权所有(C)1998爱思唯尔科学有限公司。保留所有权利。
The concentration of dissolved glycolate in sea water was measured by high performance liquid chromatography in the eastern tropical Atlantic Ocean during the Eumeli 4 oceanographic cruise in June 1992. Diurnal concentrations of glycolate reached 74 mu g 1(-1) in mesotrophic waters and 17 mu g 1(-1) in oligotrophic waters. At midday total dissolved glycolate exceeded 1 g of carbon per m(2) of ocean, decreasing strongly during the night (less than 0.1 g of carbon per m(2)). At the three stations studied, glycolate carbon difference between night and day in the water column was of the same order as the daily primary production estimated by incorporation of (CO2)-C-14. Disappearance of this compound at night suggested a rapid consumption by heterotrophic organisms. These data suggest that glycolate excretion by phytoplankton may be important, and possibly influenced by ambient nutrient concentrations. Further, with glycolate representing up to 50% of daily productivity, our estimates of the total biological reduction of CO2 need to be re-examined. Copyright (C) 1998 Elsevier Science Ltd. All rights reserved.