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首页> 外文期刊>Environmental Science & Technology >Global Ocean Spectrophotometric pH Assessment: Consistent Inconsistencies
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Global Ocean Spectrophotometric pH Assessment: Consistent Inconsistencies

机译：全球海洋分光光度法pH评估：一致的不一致

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摘要

Ocean acidification (OA)-or the decrease in seawater pH resulting from ocean uptake of CO_2 released by human activities-stresses ocean ecosystems and is recognized as a Climate and Sustainable Development Goal Indicator that needs to be evaluated and monitored. Monitoring OA-related pH changes requires a high level of precision and accuracy. The two most common ways to quantify seawater pH are to measure it spectrophotometrically or to calculate it from total alkalinity (TA) and dissolved inorganic carbon (DIC). However, despite decades of research, small but important inconsistencies remain between measured and calculated pH. To date, this issue has been circumvented by examining changes only in consistently measured properties. Currently, the oceanographic community is defining new observational strategies for OA and other key aspects of the ocean carbon cycle based on novel sensors and technologies that rely on validation against data records and/or synthesis products. Comparison of measured spectrophotometric pH to calculated pH from TA and DIC measured during the 2000s and 2010s eras reveals that (1) there is an evolution toward a better agreement between measured and calculated pH over time from 0.02 pH units in the 2000s to 0.01 pH units in the 2010s at pH > 7.6; (2) a disagreement greater than 0.01 pH units persists in waters with pH < 7.6, and (3) inconsistencies likely stem from variations in the spectrophotometric pH standard operating procedure (SOP). A reassessment of pH measurement and calculation SOPs and metrology is urgently needed.
机译：海洋酸化（OA） - 人类活动释放的CO_2导致的海水博物会减少 - 应力海洋生态系统，被认为是需要进行评估和监测的气候和可持续发展目标指标。监测相关的OA相关的pH变化需要高水平的精度和准确性。量化海水pH的两种最常见的方法是通过总碱度（TA）和溶解的无机碳（DIC）来测量分光光度法或计算它。然而，尽管有数十年的研究，但在测量和计算的pH之间仍然存在小但重要的不一致。迄今为止，通过检查始终如一的测量属性，通过检查更改来避免此问题。目前，海洋群落根据新颖的传感器和技术依赖于数据记录和/或合成产品的验证，确定海洋碳周期的OA和其他关键方面的新观测战略。测量的分光光度pH从2000年代和2010年测量的Ta和DIC计算pH值的比较揭示了（1）在2000年代的0.02 pH单位到0.01 pH单位的0.02 pH值之间测量和计算的pH之间的更好一致性达到了更好的同意。在2010年代，PH> 7.6; （2）大于0.01 pH单位的分歧在具有pH <7.6的水中持续存在，（3）不一致可能源于分光光度法pH标准操作程序（SOP）的变化。迫切需要重新评估pH测量和计算SOP和计量。

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  • 来源
    《Environmental Science & Technology》 |2020年第18期|10977-10988|共12页
  • 作者

    Marta Alvarez; Noelia M. Fajar; Brendan R. Carter; Elisa F. Guallart; Fiz F. Perez; Ryan J. Woosley; Akihiko Murata;

  • 作者单位

    Institute Espahol de Oceanografia A Coruna 15001 Spain;

    Institute Espanol de Oceanografia A Coruha 15001 Spain;

    Joint Institute for the Study of the Atmosphere and Ocean Seattle Washington 98105 United States Pacific Marine Environmental Laboratory National Oceanic and Atmospheric Administration Seattle Washington 98115 United States;

    Instituto Espanol de Oceanografia A Coruha 15001 Spain;

    Instituto de Investigaciones Marinas - CSIC Vigo 36208 Spain;

    Center for Global Change Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 United States;

    Research Institute for Global Change Japan Agency for Marine-Earth Science and Technology Kanagawa Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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