共查询到20条相似文献，搜索用时 31 毫秒
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C. C. &#;W. LEE J. H. SAVARINO H. CACHIER M. H. THIEMENS 《Tellus. Series B, Chemical and physical meteorology》2002,54(3):193-200
The recent discovery of an anomalous enrichment in 17 O isotope in atmospheric sulfate has opened a new way to investigate the oxidation pathways of sulfur in the atmosphere. From laboratory investigations, it has been suggested that the wet oxidation of sulfur in rain droplets was responsible for the excess 17 O. In order to confirm this theory, sulfur and oxygen isotope ratios of different primary sulfates produced during fossil fuel combustion have been investigated and are reported. None of these samples exhibits any anomalous oxygen or sulfur isotopic content, as compared to urban sulfate aerosols. These results, in agreement with the laboratory investigations, reinforce the idea of an aqueous origin for the oxygen-17 anomaly found in tropospheric sulfates. 相似文献
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The relationship between 18 O/16 O and 13 C/12 C ratios of ambient CO2 in two Amazonian tropical forests
LEONEL DA S. L. STERNBERG MARCELO Z. MOREIRA LUIZ A. MARTINELLI REYNALDO L. VICTORIA EDELCILIO M. BARBOSA LUIZ C. M. BONATES DANIEL NEPSTAD 《Tellus. Series B, Chemical and physical meteorology》1998,50(4):366-376
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By TOBIAS NAEGLER 《Tellus. Series B, Chemical and physical meteorology》2009,61(2):372-384
Oceanic excess radiocarbon data is widely used as a constraint for air–sea gas exchange. However, recent estimates of the global mean piston velocity 〈 k 〉 from Naegler et al., Krakauer et al., Sweeney et al. and Müller et al. differ substantially despite the fact that they all are based on excess radiocarbon data from the GLODAP data base. Here I show that these estimates of 〈 k 〉 can be reconciled if first, the changing oceanic radiocarbon inventory due to net uptake of CO2 is taken into account; second, if realistic reconstructions of sea surface Δ14 C are used and third, if 〈 k 〉 is consistently reported with or without normalization to a Schmidt number of 660. These corrections applied, unnormalized estimates of 〈 k 〉 from these studies range between 15.1 and 18.2 cm h−1 . However, none of these estimates can be regarded as the only correct value for 〈 k 〉 . I thus propose to use the 'average' of the corrected values of 〈 k 〉 presented here (16.5 ± 3.2 cm h−1 ) as the best available estimate of the global mean unnormalized piston velocity 〈 k 〉 , resulting in a gross ocean-to-atmosphere CO2 flux of 76 ± 15 PgC yr−1 for the mid-1990s. 相似文献
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GUEBUEM KIM NAJID HUSSAIN THOMAS M. CHURCH 《Tellus. Series B, Chemical and physical meteorology》2000,52(1):74-80
Many researchers have reported the widespread occurrence of excess 210 Po in the global atmosphere and suggested probable sources such as resuspension of top soils, stratospheric aerosols, sea spray of the surface micro‐layer, volcanic emission, and bio‐volatile 210 Po species from the productive ocean. We have observed excess 210 Po on aerosols in the coastal atmosphere of the Chesapeake and Delaware Bays. On‐board measurements in the Chesapeake Bay atmosphere show that the increase of this excess 210 Po is dependent upon wind speed. Simultaneously measured activity ratios of 7 Be/210 Pb and 210 Pb/222 Rn argue against either higher altitude air or continental soils as the source of this excess. We hypothesize that the excess 210 Po originates mainly from surface waters either by the sea‐spray of the surface microlayer, or more likely, by gas exchange. We conclude gas exchange as the mechanism since the polonium excess increases linearly with wind speed over a threshold of 3 m s−1 (mean) similar to other gases (i.e., CO2 , SF6 , and DMS). In addition, higher 210 Po excess with lower 222 Rn is observed in on‐shore marine air at Lewes, DE. This suggests sea‐air exchange of volatile Po along with other bio‐volatile species (i.e., DMS, DMSe, and MMHg) in the coastal productive ocean during high wind speeds. 相似文献
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Hiroshi A. Takahashi Eiichi Konohira Tetsuya Hiyama Masayo Minami Toshio Nakamura Naohiro Yoshida 《Tellus. Series B, Chemical and physical meteorology》2002,54(2):97-109
Diurnal variation in the atmospheric CO2 concentration and the carbon isotopic composition (Δ14 C and δ13 C) was measured in a forest in an urban area on 9 February 1999. The carbon isotope approach used in the present study differentiated between the quantitative contributions from anthropogenic and biogenic CO2 sources in the urban atmosphere. The anthropogenic (fossil fuel) and biogenic (soil respiration) contributions was estimated, and they ranged from 1 to 16% and from 2 to 8% of the total atmospheric CO2 . The diurnal variation of the anthropogenic CO2 was the major cause of the total atmospheric CO2 variation, while the biogenic CO2 remained relatively constant throughout the day. Estimating the contribution of soil respired CO2 provided the mean residence time of soil respired CO2 within the forest atmosphere. 相似文献
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