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Interannual variability of carbon dioxide drawdown by subantarctic surface water near New Zealand.
- Source :
- Biogeochemistry; May2011, Vol. 104 Issue 1-3, p23-34, 12p, 1 Chart, 4 Graphs, 1 Map
- Publication Year :
- 2011
-
Abstract
- The ocean-atmosphere flux of carbon dioxide in subantarctic surface water (SASW) east of New Zealand has been determined using data from bi-monthly cruises on a time series transect for 8 years. The 60 km long transect extends from the coast (45.770°S 170.720°E) to a station at 45.833°S 171.500°E. Sea surface temperature, salinity, nutrient concentrations and pCO have been measured at a frequency of about once every 2 months from January 1998 until December 2005. Measured pCO exhibits a seasonal cycle with a maximum in late winter/spring, and a minimum in late summer/autumn, a mean 356 μatm, and an amplitude of 9 μatm. The magnitude of ΔpCO (the air-sea concentration gradient) has increased over the 8 years, primarily due to the increase in atmospheric CO concentration. The air-sea flux of CO was determined from wind speed data and ΔpCO. The uptake of atmospheric CO by SASW in the study area changed from + 1 and +82 mmol m in 1998 and 1999 respectively (ocean as source) to −870 and −510 mmol m in 2004 and 2005 (ocean as sink). These values are substantially less in magnitude than the value obtained from the Takahashi et al. (Deep-Sea Res II, ) flux climatology. [ABSTRACT FROM AUTHOR]
- Subjects :
- CARBON dioxide
RESERVOIR drawdown
WATER temperature
SALINITY
WIND speed
CLIMATOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 01682563
- Volume :
- 104
- Issue :
- 1-3
- Database :
- Complementary Index
- Journal :
- Biogeochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 60874669
- Full Text :
- https://doi.org/10.1007/s10533-009-9355-3