The Influence of O3, Relative Humidity, NO and NO2 on the Oxidation of α-Pinene and Δ3-Carene     

Linda Pommer  Jerker Fick  Barbro Andersson  Calle Nilsson 《Journal of Atmospheric Chemistry》2004,48(2):173-189

Upto 13% of -pinene and ³-carene had reacted after 213 s in this dark experimental set-up, where O₃, NO and NO₂ were mixed with terpenes at different relative humidities (RHs). The different experiments were planned according to an experimental design, where O₃, NO₂, NO, RH and reaction time were varied between high and low settings (25 and 75 ppb, 15 and 42%, 44 and 213 s). An increased amount of -pinene and ³-carene reacted in the chamber was observed, when the level of O₃, NO and reaction time was increased and RH was decreased. In the study, it was found that different interactions affected the amount of terpene reacted as well. These interactions were between O₃ and NO, O₃ and reaction time, NO and RH, and between NO and reaction time.  相似文献   

Nekton use of salt marsh creeks in the upper Tejo estuary     

Jo?o?P.?SalgadoEmail author  Henrique?N.?Cabral  Maria?José?Costa  Linda?Deegan 《Estuaries and Coasts》2004,27(5):818-825

The use of the Tejo estuary, Portugal, salt marsh creeks by nekton was examined based on sampling surveys with a fyke net from September 1998 until August 2001. From the 20 taxa (14 fish species, 5 decapod crustacean species, and 1 cephalopod species) identified in the studied creeks, 16 were regularly caught throughout the sampling period. The shrimpPalaemonetes varians was the most numerically abundant species in the creeks, while the biomass was dominated by the mulletLiza ramada. The nekton assemblage was mainly represented by marine-estuarine opportunist species, comprising 85% of the total. A high seasonality was detected on the species abundance patterns: the most abundant species (P. varians, Crangon crangon, L. ramada, Pomatoschistus microps, Syngnathus sp., andAnguilla anguilla) occurred throughout the sampling period,Sardina pilchardus, Dicentrarchus, labrax, andAtherina boyeri were particularly abundant in spring and summer, andEngraulis encrasicholus, Liza aurata, Gambusia holbrooki, Palaemon longirostris, andPalaemon serratus were most abundant in autumn and winter.L. ramada occurred in the tidal creeks in high numbers during neap tides, while the majority of the remaining taxa were most abundant during spring tides, suggesting a differential pattern of habitat use occording to species.  相似文献   

Analysis of stomach contents of the porbeagle shark (Lamna nasus Bonnaterre) in the northwest Atlantic   总被引：1，自引：0，他引：1  

Joyce  W. N.; Campana  S. E.; Natanson  L. J.; Kohler  N. E.; Pratt  H. L.  Jr; Jensen  C. F. 《ICES Journal of Marine Science》2002,59(6):1263-1269

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The development of a bloom of the dinoflagellate [Gyrodinium aureolum (Hulbert)] on the south-west Irish coast     

Raine  R.; Joyce  B.; Richard  J.; Pazos  Y.; Moloney  M.; Jones  K. J.; Patching  J. W. 《ICES Journal of Marine Science》1993,50(4):461-469

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The publications of Kristian Fauchald and the polychaete taxa named in those works     

Linda A. Ward 《Marine Ecology》2005,26(3-4):145-154

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Geospatial cryptography: enabling researchers to access private,spatially referenced,human subjects data for cancer control and prevention     

Jacquez  Geoffrey M.  Essex  Aleksander  Curtis  Andrew  Kohler  Betsy  Sherman  Recinda  El Emam  Khaled  Shi  Chen  Kaufmann  Andy  Beale  Linda  Cusick  Thomas  Goldberg  Daniel  Goovaerts  Pierre 《Journal of Geographical Systems》2017,19(3):197-220

Journal of Geographical Systems - As the volume, accuracy and precision of digital geographic information have increased, concerns regarding individual privacy and confidentiality have come to the...  相似文献   

On gas fluxes from small lakes and ponds     

Joyce Kwan  Peter A. Taylor 《Boundary-Layer Meteorology》1994,68(4):339-356

A semi-empirical model for estimating gas fluxes at the air-water interface in a neutrally stratified atmosphere is presented. Gas transfer velocity is assumed to depend on local friction velocity, whose variation with over-water fetch is estimated from Walmsleyet al.'s (1989) Guidelines. As guidance for limnologists estimating CO₂ and CH₄ fluxes from lakes and ponds in the Hudson Bay Lowlands region, we present model results of the variation of gas transfer velocity with over-water fetch,k(x), for comparison with the customary constant valuek ₀. Gas fluxes are estimated over well mixed, circular and elliptical lakes and ponds. The results of accounting for fetch dependence, wind direction, pond shapes and sizes lead to correction factors to fluxes obtained withk ₀. Recent studies of gas transfer velocity for gases of low solubility from lakes are reviewed, and the problem of time averaging on quantities determined from experimental measurements is also discussed.  相似文献   

The dynamics of the ring nebula surrounding the LBV candidate He 3-519     

Linda J. Smith 《Astrophysics and Space Science》1994,216(1-2):291-295

High spatial and spectral resolution observations of the ring nebula surrounding the LBV candidate He 3-519 are presented. The data were obtained at the AAT with the UCL echelle spectrograph and cover the H and [N II] emission lines for two slit positions. The nebular motions are clearly resolved and have a total velocity spread of -40 to +100 km s^–1. The shell shows some deviations from spherical symmetry but overall is expanding at 61 km s^–1 and has an ionized mass of 2 M. The nebular parameters are found to be similar to those of the AG Car nebula, suggesting that it resulted from a bulk ejection of material 2 × 10⁴ yr ago.  相似文献   

Marine vs. terrigenous organic matter in Louisiana coastal sediments: The uses of bromine:organic carbon ratios     

Lawrence M. Mayer  Linda L. Schick  Mead A. Allison  Kathleen C. Ruttenberg  Samuel J. Bentley 《Marine Chemistry》2007

Recent data on the sources of organic carbon buried in the ocean have emphasized the probable importance of terrigenous organic matter in burial budgets of deltaic depocenters. The many markers used to assess relative importance of marine vs. terrestrial sources each have ambiguities. We use the ratio of bromine to organic carbon (Br:OC) as a source indicator for organic matter in the Mississippi delta. Progressive increases in bromine concentrations from the river to the slope indicate increasing content of marine-derived organic matter. Quantitative estimates of marine vs. terrigenous organic matter using Br:OC ratios in a two-endmember mixing model are consistent with recent estimates using a combination of three other source markers [Gordon, E.S., Goñi, M.A. 2003. Sources and distribution of terrigenous organic matter delivered by the Atchafalaya River to sediments in the northern Gulf of Mexico. Geochim. Cosmochim. Acta, 67:2359–2375]. The Br:OC vs. δ¹³C relationship indicates seaward increase in δ¹³C without proportionate incorporation of marine organic matter, consistent with recent arguments that isotopically depleted terrestrial detritus derived from C3 plants is separated from C4-derived terrigenous organic matter during transport. Decreasing Br:OC ratios downcore at many sites that have significant amounts of marine organic matter indicate that the marine organic matter is preferentially lost during burial diagenesis. This preferential loss constrains the contribution of organic matter burial in deltaic environments to global removal of Br.  相似文献   

IVS contribution to ITRF2014   总被引：5，自引：4，他引：1  

Sabine Bachmann  Daniela Thaller  Ole Roggenbuck  Michael Lösler  Linda Messerschmitt 《Journal of Geodesy》2016,90(7):631-654

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