An important biogeochemical link between organic and inorganic carbon cycling: Effects of organic alkalinity on carbonate chemistry in coastal waters influenced by intertidal salt marshes
An important biogeochemical link between organic and inorganic carbon cycling: Effects of organic alkalinity on carbonate chemistry in coastal waters influenced by intertidal salt marshes
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有机和无机碳循环之间重要的生物地球化学联系：有机碱度对受潮间带盐沼影响的沿海水域碳酸盐化学的影响
DOI：
10.1016/j.gca.2020.02.013
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发表时间：
2020
影响因子：
5
通讯作者：
Liang, Haorui
中科院分区：
文献类型：
--
作者：
Song, Shuzhen;Wang, Zhaohui Aleck;Gonneea, Meagan Eagle;Kroeger, Kevin D.;Chu, Sophie N.;Li, Daoji;Liang, Haorui
溶解有机碳 (DOC) 含有有机酸电荷基团，可将有机碱度 (OrgAlk) 贡献给总碱度 (TA)。在许多水生二氧化碳研究中，这些影响常常被忽视或被视为计算不确定性。本研究评估了美国东北部受地下水影响的盐沼与河口水域潮汐交换的 OrgAlk 变异性、来源和特征。 OrgAlk 通过直接影响 pH 值，进而影响 CO2 系统形态和缓冲能力，在有机和无机碳循环之间建立了生物地球化学联系。确定了两个主要电荷基团，包括羧基和酚基或胺基。陆地地下水和盐沼泥炭内的原位生产为潮汐溪提供了 OrgAlk，其中前者是更重要的来源。进入沼泽地的地下水含有极高的 OrgAlk (> 150μmolkg−1)，这些化合物在地下水输送和与沿海水混合的过程中优先保留在 DOC 池中。地下水和受沼泽影响的水中的 OrgAlk:DOC 比率随空间和时间的不同而变化。这凸显了使用固定比例的 DOC 来解释有机酸电荷基团的不足。考虑到在受沼泽影响的潮水中观察到的相对 OrgAlk 贡献为 TA 的 0.9-4.3%，OrgAlk 改变了 H+ 浓度~1-41nmolkg−1（相当于 pH 值变化~0.03-0.26），pCO2 改变了~30-1600 μatm，缓冲能力改变了~0.00-0.14mmolkg−1。因此，OrgAlk 可能对沿海无机碳循环产生重大影响。进一步的理论计算证实，OrgAlk 的这些浓度将对碳酸盐形态产生相当大的影响，并最终对不同沿海环境（从河口到陆架水域）的海气二氧化碳通量产生相当大的影响。提出了一种连接沿海水域有机和无机碳循环的新概念模型，以强调有机酸电荷基团的源和汇，以及它们的生物地球化学行为和对二氧化碳系统的机械控制。
Dissolved organic carbon (DOC) contains organic acid charge groups that contribute organic alkalinity (OrgAlk) to total alkalinity (TA). These effects are often ignored or treated as a calculation uncertainty in many aquatic CO2studies. This study evaluated OrgAlk variability, sources, and characteristics in estuarine waters exchanged tidally with a groundwater-influenced salt marsh in the northeast USA. OrgAlk provided a biogeochemical link between organic and inorganic carbon cycling through its direct effects on pH, and thus CO2system speciation and buffer capacity. Two main charge groups were identified including carboxylic and phenolic or amine groups. Terrestrial groundwater and in-situ production within salt marsh peat contributed OrgAlk to the tidal creek, with the former being a more significant source. Groundwater entering the marsh complex contained exceptionally high OrgAlk (> 150 µmol kg−1), and these compounds were preferentially preserved within the DOC pool during groundwater transport and mixing with coastal water. OrgAlk:DOC ratios in groundwater and marsh-influenced water varied across space and time. This highlights the insufficiency of using a fixed proportion of DOC to account for organic acid charge groups. Accounting for OrgAlk altered H+concentrations by ∼1–41 nmol kg−1(equivalent to a pH change of ∼0.03–0.26),pCO2by ∼30–1600 μatm and buffer capacity by ∼0.00–0.14 mmol kg−1at the relative OrgAlk contributions of 0.9–4.3% of TA observed in the marsh-influenced tidal water. Thus, OrgAlk may have a significant influence on coastal inorganic carbon cycling. Further theoretical calculations confirm that these concentrations of OrgAlk would have sizable impacts on both carbonate speciation and, ultimately, air-sea CO2fluxes in different coastal environments, ranging from estuarine to shelf waters. A new conceptual model linking organic and inorganic carbon cycling for coastal waters is proposed to highlight the sources and sinks of organic acid charge groups, as well as their biogeochemical behaviors and mechanistic control on the CO2system.
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通过强碱电位滴定估算海水介质中的酸解离常数 I. 水的离子积 — Kw。
DOI：
--
发表时间：
1979
期刊：
影响因子：
--
作者：
A.G Dickson;J.P Riley
通讯作者：
J.P Riley
影响因子：
4.6
作者：
Holmquist JR;Windham-Myers L;Bliss N;Crooks S;Morris JT;Megonigal JP;Troxler T;Weller D;Callaway J;Drexler J;Ferner MC;Gonneea ME;Kroeger KD;Schile-Beers L;Woo I;Buffington K;Breithaupt J;Boyd BM;Brown LN;Dix N;Hice L;Horton BP;MacDonald GM;Moyer RP;Reay W;Shaw T;Smith E;Smoak JM;Sommerfield C;Thorne K;Velinsky D;Watson E;Grimes KW;Woodrey M
通讯作者：
Woodrey M
影响因子：
5.2
作者：
R. Najjar;M. Herrmann;R. Alexander;E. Boyer;D. Burdige;D. Butman;W. Cai;E. Canuel;Robert F. Chen;M. Friedrichs;R. Feagin;P. Griffith;A. Hinson;J. Holmquist;Xinping Hu;W. Kemp;K. Kroeger;A. Mannino;S. L. McCallister;W. McGillis;M. Mulholland;C. Pilskaln;J. Salisbury;S. Signorini;P. St‐Laurent;H. Tian;M. Tzortziou;P. Vlahos;Zhaohui Aleck Wang;R. Zimmerman
通讯作者：
R. Najjar;M. Herrmann;R. Alexander;E. Boyer;D. Burdige;D. Butman;W. Cai;E. Canuel;Robert F. Chen;M. Friedrichs;R. Feagin;P. Griffith;A. Hinson;J. Holmquist;Xinping Hu;W. Kemp;K. Kroeger;A. Mannino;S. L. McCallister;W. McGillis;M. Mulholland;C. Pilskaln;J. Salisbury;S. Signorini;P. St‐Laurent;H. Tian;M. Tzortziou;P. Vlahos;Zhaohui Aleck Wang;R. Zimmerman
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
P. Tishchenko;K. Wallmann;N. A. Vasilevskaya;T. I. Volkova;V. I. Zvalinskii;N. D. Khodorenko;E. Shkirnikova
通讯作者：
E. Shkirnikova
影响因子：
4.9
作者：
Abril, G.;Bouillon, S.;Borges, A. V.
通讯作者：
Borges, A. V.