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- Title
Diurnal asymmetry in slant column density of NO, O, HO and O during CAIPEEX-IGOC over Mahabubnagar, a rural site in Southern Peninsular India.
- Authors
Meena, G.; Devara, P.; Patil, M.
- Abstract
In order to study the column densities of atmospheric trace gases over a rural environment, zenith-sky scattered light observations have been carried out by employing a high-precision, portable UV-V-IR spectrometer (Ocean Optics Model HR2000) at Mahabubnagar (16°42′N, 77°58′E) during the Cloud Aerosol Interaction and Precipitation Enhancement Experiment-Integrated Ground Observational Campaign during October 1, 2011-November 11, 2011. The observed and calculated differential optical density spectra of NO, O, HO and O are compared in the spectral range 462-498 nm and found good agreement within a percent deviation up to 1, 1, 0.5 and 0.8 %, respectively. Differential slant column densities (SCD) of NO, O, HO and O are retrieved to present the diurnal variation at morning and evening hours between 65° and 95° solar zenith angles (SZAs). The SCD at morning and evening 90° SZA are observed to be 6.4 × 10 and 9.4 × 10 mol cm for NO; 1.03 × 10 and 1.38 × 10 mol cm for O; 1.7 × 10 and 1.8 × 10 mol cm for HO, 1.23 × 10 and 1.57 × 10 mol cm for O, respectively. The diurnal variations of NO in twilight period are observed to vary from 36 to 75 %, O from 23 to 40 %, HO from 2 to 20 % and O from 23 to 53 % during the study period. The SCDs of NO, O and O are observed to be higher in the evening twilight hours compared to the morning twilight hours, which may be due to higher temperature observed at evening as compared to morning between 65° and 95° SZAs.
- Subjects
INDIA; TRACE gases; ATMOSPHERE; DENSITY; PROPERTIES of matter
- Publication
Natural Hazards, 2016, Vol 82, Issue 1, p389
- ISSN
0921-030X
- Publication type
Article
- DOI
10.1007/s11069-016-2206-3