Archive · collection · 2006
Carbonate system data on the Molokai reef flat
Listed in PANGAEA and DataCite — shown once because both records carry DOI 10.1594/pangaea.743388
The severity of the impact of elevated atmospheric pCO2 to coral reef ecosystems depends, in part, on how seawater pCO2 affects the balance between calcification and dissolution of carbonate sediments.
Description
Presently, there are insufficient published data that relate concentrations of pCO2 and CO3**2- to in situ rates of reef calcification in natural settings to accurately predict the impact of elevated atmospheric pCO2 on calcification and dissolution processes.
Rates of net calcification and dissolution, CO3**2- concentrations, and pCO2 were measured, in situ, on patch reefs, bare sand, and coral rubble on the Molokai reef flat in Hawaii. Rates of calcification ranged from 0.03 to 2.30 mmol CaCO3/m**2/h and dissolution ranged from -0.05 to -3.3 mmol CaCO3/m**2/h. Calcification and dissolution varied diurnally with net calcification primarily occurring during the day and net dissolution occurring at night.
Read the rest (3 more)
These data were used to calculate threshold values for pCO2 and CO3**2- at which rates of calcification and dissolution are equivalent. Results indicate that calcification and dissolution are linearly correlated with both CO3**2- and pCO2. Threshold pCO2 and CO3**2- values for individual substrate types showed considerable variation.
The average pCO2 threshold value for all substrate types was 654±195 µatm and ranged from 467 to 1003 µatm. The average CO3**2- threshold value was 152±24 µmol/kg, ranging from 113 to 184 µmol/kg. Ambient seawater measurements of pCO2 and CO3**2- indicate that CO3**2- and pCO2 threshold values for all substrate types were both exceeded, simultaneously, 13% of the time at present day atmospheric pCO2 concentrations.
It is predicted that atmospheric pCO2 will exceed the average pCO2 threshold value for calcification and dissolution on the Molokai reef flat by the year 2100.
Links
Where it is published
- Repository landing page doi.pangaea.de/10.1594/PANGAEA.743388 ↗
landing page · from DataCite
- DOI doi.org/10.1594/pangaea.743388 ↗
DOI / persistent id · from PANGAEA
Documentation and papers
- Creative Commons Attribution 3.0 Unported creativecommons.org/licenses/by/3.0/legalcode ↗
license · from DataCite
- IsSupplementTo 10.5194/bg-3-357-2006 doi.org/10.5194/bg-3-357-2006 ↗
publication · from DataCite
Catalogue records · 3
- OAI-PMH record ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=oai_dc&identifier=o… ↗
metadata API · from PANGAEA
- DataCite API api.datacite.org/dois/10.1594/pangaea.743388 ↗
metadata API · from DataCite
- DataCite Commons commons.datacite.org/doi.org/10.1594/pangaea.743388 ↗
catalogue entry · from DataCite
Topics
- Stated by source
- Earth and related environmental sciences
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science · Oceanography
Provenance · 2 source records, 9 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| PANGAEA | oai:pangaea.de:doi:10.1594/PANGAEA.743388 | 14 d ago | JSON v1 |
| DataCite | 10.1594/pangaea.743388 | 14 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · PANGAEA | connector:pangaea@1.0.0 | |
| concepts[field].fos:earth-and-related-environmental-sciences | source · DataCite | connector:datacite@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · PANGAEA | connector:pangaea@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · DataCite | vocabulary-mapper@1.0.0 | keywords['Oceanography'] |
| description | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/description |
| license | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/rights |
| publication_date | source · PANGAEA | connector:pangaea@1.0.0 | |
| spatial | source · PANGAEA | connector:pangaea@1.0.0 | |
| title | source · PANGAEA | connector:pangaea@1.0.0 | /metadata/dc/title |