Title
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Munida Transect Ocean Carbon Data off the Otago coast, New Zealand |
Date
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2017-01-04T02:30:00 |
Date type
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creation: date identifies when the resource was brought into existence
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Other citation details
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The citation in a list of references is: "NIWA [year-of-data-download], [Title], [data-access-url], accessed [date-of-access]"
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Abstract
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New Zealand is not immune to ocean acidification. The ‘Munida transect’ Time-series in sub-antarctic waters off Otago is
the Southern Hemisphere’s longest-running record of pH measurements. Monitoring since 1998 has established a decline in
pH that reflects the increase in atmospheric CO2 recorded at NIWA’s atmospheric research station near Wellington.
The Munida time-series is led by NIWA’s Kim Currie, in collaboration with the University of Otago's Department of Chemistry.
Every two months she has collected water samples along a 65-kilometre line from the tip of Otago Harbour out to sub-antarctic
waters. This time-series is particularly valuable because it covers both subtropical and sub-antarctic waters in a one-day
trip, so is in a unique location.
During the transect University of Otago scientists measure the pH while Currie measures alkalinity, total dissolved inorganic
carbon and CO2 as well as other related parameters. The supporting data help to determine what processes are causing changes
in the properties of the water masses, including the changes in pH. For example, pH is linked to temperature and therefore
varies between summer and winter and also year to year.
Parameters in the data set include:
XCO2_DRY - Mole fraction of carbon dioxide (dry air) in the headspace of the equilibrator, unit micromole / mole
XH2O - Mole fraction of water vapour (dry air) in the headspace of the equilibrator, unit micromole / mole
EQ_PRE - The pressure in the equilibrator head space in hectopascal
EQ_TEMP - The temperature of the water in the equilibrator
PCO2_WAT - The Partial pressure of carbon dioxide in the water body in units of microatmospheres
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Status
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historicalArchive: data has been stored in an offline storage facility
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Descriptive keywords
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Global / Oceans | Pacific Ocean, Regional Seas | Tasman Sea, Countries | New Zealand (place). |
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Language
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English |
Character set
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utf8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
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Topic category code
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oceans |
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Time position
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2006-01-26T00:00:00 |
Time position
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2006-10-24T23:45:00 |
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