DOI: 10.1002/2017GB005631
Scopus记录号: 2-s2.0-85028327603
论文题名: In situ measurements of atmospheric O2 and CO2 reveal an unexpected O2 signal over the tropical Atlantic Ocean
作者: Pickers P ; A ; , Manning A ; C ; , Sturges W ; T ; , Le Quéré C ; , Mikaloff Fletcher S ; E ; , Wilson P ; A ; , Etchells A ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 8 起始页码: 1289
结束页码: 1305
语种: 英语
英文关键词: Atlantic
; model
; ocean
; outgassing
; oxygen
Scopus关键词: annual variation
; atmosphere-ocean system
; atmospheric transport
; carbon dioxide
; container ship
; diffusion
; environmental gradient
; in situ measurement
; intertropical convergence zone
; meridional circulation
; oxygen
; seasonal variation
; tracer
; Atlantic Ocean
; Atlantic Ocean (Equatorial)
; Atlantic Ocean (Tropical)
; Pacific Ocean
英文摘要: We present the first meridional transects of atmospheric O2 and CO2 over the Atlantic Ocean. We combine these measurements into the tracer atmospheric potential oxygen (APO), which is a measure of the oceanic contribution to atmospheric O2 variations. Our new in situ measurement system, deployed on board a commercial container ship during 2015, performs as well as or better than existing similar measurement systems. The data show small short-term variability (hours to days), a step-change corresponding to the position of the Intertropical Convergence Zone (ITCZ), and seasonal cycles that vary with latitude. In contrast to data from the Pacific Ocean and to previous modeling studies, our Atlantic Ocean APO data show no significant bulge in the tropics. This difference cannot be accounted for by interannual variability in the position of the ITCZ or the Atlantic Meridional Mode Index and appears to be a persistent feature of the Atlantic Ocean system. Modeled APO using the TM3 atmospheric transport model does exhibit a significant bulge over the Atlantic and overestimates the interhemispheric gradient in APO over the Atlantic Ocean. These results indicate that either there are inaccuracies in the oceanic flux data products in the equatorial Atlantic Ocean region, or that there are atmospheric transport inaccuracies in the model, or a combination of both. Our shipboard O2 and CO2 measurements are ongoing and will reveal the long-term nature of equatorial APO outgassing over the Atlantic as more data become available. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77717
Appears in Collections: 气候变化事实与影响
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作者单位: Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Tyndall Centre for Climate Change Research, University of East Anglia, Norwich, United Kingdom; National Institute of Water and Atmospheric Research, Wellington, New Zealand
Recommended Citation:
Pickers P,A,, Manning A,et al. In situ measurements of atmospheric O2 and CO2 reveal an unexpected O2 signal over the tropical Atlantic Ocean[J]. Global Biogeochemical Cycles,2017-01-01,31(8)