DOI: 10.1002/gbc.20016
Scopus记录号: 2-s2.0-84876927307
论文题名: Annual cycle of air-sea CO2 exchange in an Arctic Polynya Region
作者: Else B ; G ; T ; , Papakyriakou T ; N ; , Asplin M ; G ; , Barber D ; G ; , Galley R ; J ; , Miller L ; A ; , Mucci A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 2 起始页码: 388
结束页码: 398
语种: 英语
英文关键词: Air-Sea Gas Transfer
; Polynya
; Sea Ice
Scopus关键词: Bulk aerodynamic
; Eddy covariance measurements
; Gas transfer
; International polar year
; Measurements of
; Polynya
; Sea ice concentration
; Sea surface temperature (SST)
; Atmospheric temperature
; Freezing
; Sea ice
; Carbon dioxide
; aerodynamics
; air-sea interaction
; annual cycle
; carbon dioxide
; carbon flux
; carbon sink
; eddy covariance
; freezing
; gas transport
; polynya
; sea ice
; sea surface temperature
; wind velocity
; Arctic Ocean
; Beaufort Sea
; Cape Bathurst Polynya
英文摘要: During the Canadian International Polar Year projects in the Cape Bathurst polynya region, we measured a near-complete annual cycle of sea surface CO 2 (pCO2sw), atmospheric CO2 (pCO 2atm), sea surface temperature (SST), salinity (S), and wind speed (U). In this paper, we combine these data with ancillary measurements of sea ice concentration (Ci) to estimate the mean annual (September 2007-September 2008) air-sea CO2 exchange for the region. For the non-freezing seasons the exchange was calculated using a standard bulk aerodynamic approach, whereas during the freezing seasons we extrapolated eddy covariance measurements of CO2 exchange. Our results show that in 2007-08 the region served as a net sink of atmospheric CO2 at a mean rate of -10.1 ± 6.5 mmol m- 2 d- 1. The strongest calculated uptake rate occurred in the fall when wind velocities were highest, pCO2sw was significantly lower than pCO2atm, and ice was beginning to form. Atmospheric CO2 uptake was calculated to occur (at lower rates) throughout the rest of the year, except for a brief period of outgassing during late July. Using archival U, Ci, and pCO 2sw data for the region, we found that winds in 2007-08 were 25-35 % stronger than the decadal mean and were predominately easterly, which appears to have induced a relatively late freeze-up (by ∼ 3 weeks relative to mean conditions) and an early polynya opening (by ∼ 4 weeks). In turn, these conditions may have given rise to a higher CO2 uptake than normal. Estimated winter CO2 exchange through leads and small polynya openings made up more than 50% of the total CO2 uptake, consistent with recent observations of enhanced CO2 exchange associated with open water components of the winter icescape. Our calculations for the Cape Bathurst polynya region are consistent with past studies that estimated the total winter CO2 uptake in Arctic coastal polynyas to be on the order of 1012 g C yr- 1. ©2013. 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/77612
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada; Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada; GEOTOP, Department of Earth and Planetary Science, McGill University, Montreal, QC, Canada
Recommended Citation:
Else B,G,T,et al. Annual cycle of air-sea CO2 exchange in an Arctic Polynya Region[J]. Global Biogeochemical Cycles,2013-01-01,27(2)