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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dissolved methane concentration and flux in the coastal zone of the Southern California Bight-Mexican sector: Possible influence of wastewater
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Dissolved methane concentration and flux in the coastal zone of the Southern California Bight-Mexican sector: Possible influence of wastewater

机译：南加州比特-墨西哥地区沿海地区溶解的甲烷浓度和通量：废水的可能影响

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摘要

We measured dissolved methane concentrations ([CH_4]) in the coastal zone of the Southern California Bight-Mexican sector (SCBMex) during two cruises: S1 in the USA-Mexico Border Area (BA) during a short rainstorm and S2 in the entire SCBMex during a drier period a few days later. High spatial variability in surface mixed layer (ML) [CH_4] was observed, ranging from 2.2 nmol L~(-1) to 17.8 nmol L~(-1). ML-[CH_4] was supersaturated at all BA stations during both cruises. The highest [CH_4] was 72.4 nmol L~(-1) (2819 % supersaturated) measured at 10 m depth during S2, about 3 km southwest of the discharge point of the South Bay Ocean Outfall (SBOO). Our results show an apparent connection between wastewater treatment discharges and [CH_4]. Application of a sewer CH_4 production model suggests that the SBOO may be a large source of CH_4 to the BA and points to the need to consider point sources in developing coastal marine CH_4 budgets for highly populated areas. Based on our data, the SCBMex appears to be a relatively strong source of CH_4 to the atmosphere compared to other Pacific Basin areas. The average BA sea-to-air CH_4 flux (F) during S1 was (15.5 ± 8.6) × 10~(-2) nmol m~(-2) s~(-1) about 1.5 times higher than F during S2, which had a flux of (9.5 ± 6.9) × 10~(-2) nmol m~(-2) s~(-1) mainly due to the higher wind speed during S1.
机译：我们在两次巡游中测量了南加州海岸线墨西哥地区（SCBMex）沿海地区的溶解甲烷浓度（[CH_4]）：一次短暴雨期间在美国墨西哥边境地区（BA）的S1和整个SCBMex的S2在几天后的干旱时期。在表面混合层（ML）[CH_4]中观察到高空间变异性，范围从2.2 nmol L〜（-1）到17.8 nmol L〜（-1）。两次巡航期间，所有BA站的ML- [CH_4]都过饱和。 S2期间，在南湾海洋排污口（SBOO）排放点西南约3 km处，在10 m深度测得的最高[CH_4]为72.4 nmol L〜（-1）（2819％过饱和）。我们的结果表明废水处理排放与[CH_4]之间存在明显的联系。下水道CH_4生产模型的应用表明，SBOO可能是BA的CH_4的主要来源，并指出在为人口稠密地区开发沿海海洋CH_4预算时需要考虑点源。根据我们的数据，与其他太平洋盆地地区相比，SCBMex似乎是大气中CH_4的相对强大来源。 S1期间BA的平均海空CH_4通量（F）为（15.5±8.6）×10〜（-2）nmol m〜（-2）s〜（-1）约为S2期间F的1.5倍，其通量为（9.5±6.9）×10〜（-2）nmol m〜（-2）s〜（-1），主要是由于S1期间风速较高。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第1期|65-74|共10页
  • 作者

    Karel Castro-Morales; J. Vinicio Macias-Zamora; S. Raul Canino-Herrera; Roger A. Burke;

  • 作者单位

    Facultad de Ciencias Marinas, Universidad Autonoma de Baja California, Can. Tijuana-Ensenada, Ensenada, Baja California 22800, Mexico,Institute de Investigaciones Oceanologicas, Carr. Tijuana-Ensenada, Ensenada, Baja California 22800, Mexico;

    Institute de Investigaciones Oceanologicas, Carr. Tijuana-Ensenada, Ensenada, Baja California 22800, Mexico;

    Facultad de Ciencias Marinas, Universidad Autonoma de Baja California, Can. Tijuana-Ensenada, Ensenada, Baja California 22800, Mexico;

    Ecosystems Research Division, National Exposure Research Laboratory, U.S. Environmental Protection Agency, 960 College Station Road, Athens, GA 30605, USA;

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  • 正文语种 eng
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  • 关键词

    methane; coastal zone; outfalls; air-water exchanges; Mexico;

    机译：甲烷沿海地区排污口;空气-水交换;墨西哥;

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