dorsal/arxiv
View SchemaCharacteristics of Aerosol Spectral Optical Depths over Manora Peak, Nainital $-$ A High Altitude Station in the Central Himalayas
| Authors | Ram Sagar, Brijesh Kumar, U. C. Dumka, K. Krishna Moorthy, P. Pant |
|---|---|
| Categories | |
| ArXiv ID | physics/0306043 |
| URL | https://arxiv.org/abs/physics/0306043 |
| DOI | 10.1029/2003JD003954 |
Abstract
We present, for the first time, spectral behaviour of aerosol optical depths (AODs) over Manora Peak, Nainital located at an altitude of $\sim$ 2 km in the Shivalik ranges of central Himalayas. The observations were carried out using a Multi-Wavelength solar Radiometer during January to December 2002. The main results of the study are extremely low AODs during winter, a remarkable increase to high values in summer and a distinct change in the spectral dependencies of AODs from a relatively steeper spectra during winter to a shallower one in summer. During transparent days, the AOD values lie usually below 0.08 while during dusty (turbid) days, it lies between 0.08 to 0.69 at 0.5 $\mu$m. The average AOD value at 0.5 $\mu$m during winters, particularly in January and February, is $\sim 0.03\pm0.01$. The mean aerosol extinction law at Manora Peak during 2002 is best represented by $0.10 \lambda^{-0.61}$. However during transparent days, which almost covers 40% of the time, it is represented by $0.02 \lambda^{-0.97}$. This value of wavelength exponent, representing reduced coarse concentration and presence of fine aerosols, indicates that the station measures aerosol in the free troposphere at least during part of the year.
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"abstract": "We present, for the first time, spectral behaviour of aerosol optical depths\n(AODs) over Manora Peak, Nainital located at an altitude of $\\sim$ 2 km in the\nShivalik ranges of central Himalayas. The observations were carried out using a\nMulti-Wavelength solar Radiometer during January to December 2002. The main\nresults of the study are extremely low AODs during winter, a remarkable\nincrease to high values in summer and a distinct change in the spectral\ndependencies of AODs from a relatively steeper spectra during winter to a\nshallower one in summer. During transparent days, the AOD values lie usually\nbelow 0.08 while during dusty (turbid) days, it lies between 0.08 to 0.69 at\n0.5 $\\mu$m. The average AOD value at 0.5 $\\mu$m during winters, particularly in\nJanuary and February, is $\\sim 0.03\\pm0.01$. The mean aerosol extinction law at\nManora Peak during 2002 is best represented by $0.10 \\lambda^{-0.61}$. However\nduring transparent days, which almost covers 40% of the time, it is represented\nby $0.02 \\lambda^{-0.97}$. This value of wavelength exponent, representing\nreduced coarse concentration and presence of fine aerosols, indicates that the\nstation measures aerosol in the free troposphere at least during part of the\nyear.",
"arxiv_id": "physics/0306043",
"authors": [
"Ram Sagar",
"Brijesh Kumar",
"U. C. Dumka",
"K. Krishna Moorthy",
"P. Pant"
],
"categories": [
"physics.ao-ph"
],
"doi": "10.1029/2003JD003954",
"title": "Characteristics of Aerosol Spectral Optical Depths over Manora Peak, Nainital $-$ A High Altitude Station in the Central Himalayas",
"url": "https://arxiv.org/abs/physics/0306043"
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