DOI: 10.1002/2015GB005324
Scopus记录号: 2-s2.0-84971201960
论文题名: Are mangroves drivers or buffers of coastal acidification? Insights from alkalinity and dissolved inorganic carbon export estimates across a latitudinal transect
作者: Sippo J ; Z ; , Maher D ; T ; , Tait D ; R ; , Holloway C ; , Santos I ; R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期: 5 起始页码: 753
结束页码: 766
语种: 英语
英文关键词: alkalinity
; carbon
; greenhouse gas
; mangroves
; ocean acidification
Scopus关键词: acidification
; alkalinity
; buffering
; carbon sink
; coastal zone
; dissolved inorganic carbon
; greenhouse gas
; inorganic carbon
; latitudinal gradient
; mangrove
; net primary production
; pH
; pristine environment
; transect
; Australia
; Rhizophoraceae
英文摘要: Mangrove forests are hot spots in the global carbon cycle, yet the fate for a majority of mangrove net primary production remains unaccounted for. The relative proportions of alkalinity and dissolved CO2 [CO2*] within the dissolved inorganic carbon (DIC) exported from mangroves is unknown, and therefore, the effect of mangrove DIC exports on coastal acidification remains unconstrained. Here we measured dissolved inorganic carbon parameters over complete tidal and diel cycles in six pristine mangrove tidal creeks covering a 26° latitudinal gradient in Australia and calculated the exchange of DIC, alkalinity, and [CO2*] between mangroves and the coastal ocean. We found a mean DIC export of 59 mmol m−2 d−1 across the six systems, ranging from import of 97 mmol m−2 d−1 to an export of 85 mmol m−2 d−1. If the Australian transect is representative of global mangroves, upscaling our estimates would result in global DIC exports of 3.6 ± 1.1 Tmol C yr−1, which accounts for approximately one third of the previously unaccounted for mangrove carbon sink. Alkalinity exchange ranged between an import of 1.2 mmol m−2 d−1 and an export of 117 mmol m−2 d−1 with an estimated global export of 4.2 ± 1.3 Tmol yr−1. A net import of free CO2 was estimated (−11.4 ± 14.8 mmol m−2 d−1) and was equivalent to approximately one third of the air-water CO2 flux (33.1 ± 6.3 mmol m−2 d−1). Overall, the effect of DIC and alkalinity exports created a measurable localized increase in coastal ocean pH. Therefore, mangroves may partially counteract coastal acidification in adjacent tropical waters. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77850
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW, Australia; National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW, Australia
Recommended Citation:
Sippo J,Z,, Maher D,et al. Are mangroves drivers or buffers of coastal acidification? Insights from alkalinity and dissolved inorganic carbon export estimates across a latitudinal transect[J]. Global Biogeochemical Cycles,2016-01-01,30(5)