This paper introduces the Atmospheric Measurement Techniques special issue on tropospheric profiling, which was conceived to host full papers presenting the results shown at the 9th International ...Symposium on Tropospheric Profiling (ISTP9). ISTP9 was held in L'Aquila (Italy) from 3 to 7 September 2012, bringing together 150 scientists representing of 28 countries and 3 continents. The tropospheric profiling special issue collects the highlights of ISTP9, reporting recent advances and future challenges in research and technology development.
Abstract
The solar radiative properties of cirrus clouds depend on ice particle shape, size, and orientation, as well as on the spatial cloud structure. Radiation schemes in atmospheric circulation ...models rely on estimates of cloud optical thickness only. In the present work, a Monte Carlo radiative transfer code is applied to various cirrus cloud scenarios to obtain the radiative response of uncertainties in the above-mentioned microphysical and spatial cloud properties (except orientation). First, plane-parallel homogeneous (0D) clouds with different crystal shapes (hexagonal columns, irregular polycrystals) and 114 different size distributions have been considered. The resulting variabilities in the solar radiative fluxes are in the order of a few percent for the reflected and about 1% for the diffusely transmitted fluxes. Largest variabilities in the order of 10% to 30% are found for the solar broadband absorptance. However, these variabilities are smaller than the flux differences caused by the choice of ice particle geometries.
The influence of cloud inhomogeneities on the radiative fluxes has been examined with the help of time series of Raman lidar extinction coefficient profiles as input for the radiative transfer calculations. Significant differences between results for inhomogeneous and plane-parallel clouds were found. These differences are in the same order of magnitude as those arising from using extremely different crystal shapes for the radiative transfer calculations. From this sensitivity study, the ranking of cirrus cloud properties according to their importance in solar broadband radiative transfer is optical thickness, ice crystal shape, ice particle size, and spatial structure.
Introduction: To conduct an evidence-based review of the literature on the effectiveness of partner notification strategies for syphilis, gonorrhea, chlamydia, and human immunodeficiency virus (HIV) ...in the United States.
Methods: Systematic literature searches of available databases yielded 212 English language articles on partner notification, 13 of which met the inclusion criteria. These 13 articles were systematically reviewed, abstracted, and rated for quality of study methods, analysis, and generalizability.
Results: Partner notification can newly detect HIV and other sexually transmitted diseases among partners. Of the six high-quality studies, the highest numbers of infections per infected person, 0.23 and 0.24, were detected by provider referral while the lowest number of infections per infected person, 0.03, was detected by self referral. None of the 13 studies examined the consequences of partner notification, such as infections or health consequences averted or changes in behavior and partnerships for infected persons or their partners.
Conclusions: There is good evidence that partner notification is a means of newly detecting infections. In addition, there is fair evidence that provider referral generally ensures that more partners are notified and medically evaluated than does self referral. More research is needed to improve elicitation and notification procedures and tailor them to specific populations, to assess the effect of new testing technologies on partner notification, and to understand the consequences of partner notification for infected persons and their partners.
Schwannomas (neurilemmomas) are benign tumors arising from the Schwann cells of the neural sheath. They are typically well-encapsulated lesions and in the chest they are most commonly seen within the ...posterior mediastinum, often originating along the intercostal nerves. Several operative approaches have previously been described for the resection of these tumors, including thoracoscopic techniques and posterolateral thoracotomy. We report a case of a massive schwannoma (27 cm, maximum diameter), unresectable by described approaches, which was successfully excised using a clamshell thoracotomy.
Modelling diffraction by facetted particles Hesse, E.; Macke, A.; Havemann, S. ...
Journal of quantitative spectroscopy & radiative transfer,
03/2012, Letnik:
113, Številka:
5
Journal Article
Recenzirano
Odprti dostop
A method to approximate azimuthally resolved light scattering patterns and phase functions due to diffraction and external reflection by strongly absorbing facetted particles is demonstrated for a ...cube and compared with results from an exact method, T-matrix. A phase function averaged over a range of orientations of a strongly absorbing hexagonal column of aspect ratio unity has been calculated and tested against Discrete Dipole Approximation (DDA) results for a size parameter of 50.
► Improved model of diffraction by faceted particle compared to projected cross sect. ► Kirchhoff approximation applied to sets of apertures corresponding to facets. ► The method has been tested against T-matrix results for a strongly absorbing cube. ► Method suitable for modelling external diffraction within geometric optics.
The Maritime Aerosol Network (MAN) has been collecting data over the oceans since November 2006. The MAN archive provides a valuable resource for aerosol studies in maritime environments. In the ...current paper we investigate correlations between ship-borne aerosol optical depth (AOD) and near-surface wind speed, either measured (onboard or from satellite) or modeled (NCEP). According to our analysis, wind speed influences columnar aerosol optical depth, although the slope of the linear regression between AOD and wind speed is not steep (~0.004–0.005), even for strong winds over 10 m s−1. The relationships show significant scatter (correlation coefficients typically in the range 0.3–0.5); the majority of this scatter can be explained by the uncertainty on the input data. The various wind speed sources considered yield similar patterns. Results are in good agreement with the majority of previously published relationships between surface wind speed and ship-based or satellite-based AOD measurements. The basic relationships are similar for all the wind speed sources considered; however, the gradient of the relationship varies by around a factor of two depending on the wind data used.
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