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Global net community production estimated from the annual cycle of surface water total dissolved inorganic carbon SCIE SCOPUS

Title
Global net community production estimated from the annual cycle of surface water total dissolved inorganic carbon
Authors
Lee, K
Date Issued
2001-09
Publisher
AMER SOC LIMNOLOGY OCEANOGRAPHY
Abstract
Global net community production is determined, for the first time, from the decrease in salinity (S)-normalized total dissolved inorganic carbon (NCT = C-T x 35/S) inventory in the surface mixed layer corrected for changes due to net air-sea CO2 exchange and diffusive carbon flux from the upper thermocline. Changes in the mixed layer NCT inventory are estimated using a derived annual cycle of NCT and global records of the mixed layer depth. The annual NCT cycle is deduced from regional algorithms relating NCT to sea surface temperature (SST) and nitrate (NO3-), along with global records of seasonal mean SST and NO3-, and from the monthly mean surface partial pressure of CO2 and total alkalinity fields using thermodynamic models. The two methods show similar regional trends and yield global net community production estimates of 6.7 and 8.0 Gt C (1 Gt C = 1 x 10(12) kg carbon), respectively. The two global estimates are not significantly different and represent an 8-month period of 1990 (warming period) during which the mixed layer NCT concentration decreases. However, the estimates do not account for net community production during a 4-month cooling period. Ratios of net community production during the warming and cooling periods are estimated from multiyear sediment trap data at the Hawaii Ocean Time-series (22 degreesN, 158 degreesW) and Ocean Weather Station P (50 degreesN, 145 degreesW) sites. Global extrapolation of these ratios yields annual rates of net community production of 9.1 +/- 2.7 and 10.8 +/- 2.7 Gt C yr(-1).
URI
https://oasis.postech.ac.kr/handle/2014.oak/11349
DOI
10.4319/lo.2001.46.6.1287
ISSN
0024-3590
Article Type
Article
Citation
LIMNOLOGY AND OCEANOGRAPHY, vol. 46, no. 6, page. 1287 - 1297, 2001-09
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이기택LEE, KITACK
Div of Environmental Science & Enginrg
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