ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Digitale Medien

Calculations of the temperature dependence of the NO2 photodissociation coefficient in the atmosphere (1984)

Madronich, S. ; Hastie, D. R. ; Ridley, B. A. ; [weitere]

Springer

Journal of atmospheric chemistry 1 (1984), S. 151-157

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1573-0662

Schlagwort(e): Atmosphere ; photolysis ; nitrogen dioxide ; photodissociation coefficient ; temperature effect

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie , Geologie und Paläontologie

Notizen: Abstract The photodissociation coefficient, J NO2 of NO2 in the atmosphere was calculated at 235 and 298 K using the measured temperature dependences of the absorption cross-sections and quantum yields. These calculations gave a ratio J NO2(298 K)/J NO2(235 K)=1.155±0.010 which is only weakly dependent on altitude, surface albedo and solar zenith angle.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00053837

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

Unbekannt

Ground-based nitric oxide measurements at Wallops Island, Virginia (1985)

Carroll, M. A. ; Mcfarland, M. ; Ridley, B. A. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-19

Beschreibung: In July of 1983, ambient measurements of nitric oxide (NO) were obtained at Wallops Island, VA, during the NASA GTE/CITE ground-based instrument intercomparison field study. The instrument, which was designed for measurements in the remote troposphere from an aircraft platform, is briefly described. Ten days of ambient air observations showed broadly uniform diurnal behavior, although considerable variability was encountered. Two distinct synoptic meteorological conditions resulted in markedly different levels of nitric oxide abundance. When the local winds were from the north to west sectors, which placed the sampling site within 130 to 300 km of large urban centers, the midday mixing ratios were typically in the range of 200-300 pptv. In contrast, when the air mass sustained a 1- or 2-day period over the Atlantic Ocean, the mixing ratios were substantially lower and in the 50-60 pptv range.

Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 12

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

Unbekannt

An intercomparison of nitric oxide measurement techniques (1985)

Carroll, M. A. ; Davis, D. D. ; Rodgers, M. O. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-19

Beschreibung: Results from an intercomparison of techniques to measure tropospheric levels of nitric oxide (NO) are discussed. The intercomparison was part of the National Aeronautics and Space Administration's Global Tropospheric Experiment and was conducted at Wallops Island, VA, in July 1983. Instruments intercompared included a laser-induced fluorescence system and two chemiluminescence instruments. The intercomparisons were performed with ambient air at NO mixing ratios ranging from 10 to 60 pptv and NO-enriched ambient air at mixing ratios from 20 to 170 pptv. All instruments sampled from a common manifold. The techniques exhibited a high degree of correlation among themselves and with changes in the NO mixing ratio. Agreement among the three techniques was placed at approximately + or - 30 percent. Within this level of agreement, no artifacts or species interferences were identified.

Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 12

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

Unbekannt

Convective Generation of Cirrus Near the Tropopause (2004)

Webster, C. R. ; Garrett, T. J. ; Ridley, B. A. ; [weitere]

In: CASI

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2018-06-06

Beschreibung: The July 2004 CRYSTAL-FACE field program, based from Key West, Florida, showed that long-lived thin tropopause cirrus (TTC) layers were common above thunderstorm anvils. This paper investigates the origins of these cloud using airborne measurements. The horizontal dimensions of the TTC were nearly identical to the convectively formed anvil beneath. However, the TTC did not appear to have originated from convective detrainment. Rather it appears to have formed in stably stratified air derived from high altitudes near the tropopause. The TTC was separated from the anvil by approx. 1 km, it lacked precipitation particles, and it was strongly depleted in HDO. Nonetheless, compared to surrounding clear air near the tropopause, the TTC was enriched in moisture and trace gases in a manner consistent with it having mixed with the same convective airmass that produced the anvil. Unlike surrounding air, the TTC had embedded a monochromatic gravity wave with a wavelength of 2 km and an amplitude of several hundred meters. Combined, this evidence, supported by a photograph from CRYSTAL-FACE, leads to the conjecture that the TTC originated as a pileus cloud layer, which formed near the tropopause ahead of vigorous convective uplift. We hypothesize that the pileus was penetrated by the convection, moistened through mixing, and once the convection subsided, it was sustained by radiative cooling due to the presence of the anvil layer beneath.

Schlagwort(e): Meteorology and Climatology

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

Unbekannt

Quantifying the Impact of the North American Monsoon and Deep Midlatitude Convection on the Subtropical Lowermost Stratosphere using in Situ Measurements (2007)

Xueref, I. ; Richard, E. C. ; Anderson, J. G. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2019-07-19

Beschreibung: The chemical composition of the lowermost stratosphere exhibits both spatial and temporal variability depending upon the relative strength of (1) isentropic transport from the tropical tropopause layer (TTL), (2) diabatic descent from the midlatitude and northern midlatitude stratosphere followed by equatorward isentropic transport, and (3) diabatic ascent from the troposphere through convection. In situ measurements made in the lowermost stratosphere over Florida illustrate the additional impact of equatorward flow around the monsoon anticyclone. This flow carries, along with older stratospheric air, the distinct signature of deep midlatitude convection. We use simultaneous in situ measurements of water vapor (H2O), ozone (O3), total odd nitrogen (NOy), carbon dioxide (CO2), and carbon monoxide (CO) in the framework of a simple box model to quantify the composition of the air sampled in the lowermost stratosphere during the mission on the basis of tracer mixing ratios ascribed to the source regions for these transport pathways. The results show that in the summer, convection has a significant impact on the composition of air in the lowermost stratosphere, being the dominant source of water vapor up to the 380 K isentrope. The implications of these results extend from the potential for heterogeneous ozone loss resulting from the increased frequency and lifetime of cirrus near the local tropopause, to air with increased water vapor that as part of the equatorward flow associated with the North American monsoon can become part of the general circulation.

Schlagwort(e): Meteorology and Climatology

Materialart: Journal of Geophysical Research (ISSN 0148-0227); 112

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

Treffer 1 - 5 | 5 Treffer