完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.author | Shukla, K. K. | en_US |
dc.contributor.author | Phanikumar, D., V | en_US |
dc.contributor.author | Newsom, Rob K. | en_US |
dc.contributor.author | Ojha, N. | en_US |
dc.contributor.author | NiranjanKumar, K. | en_US |
dc.contributor.author | Singh, Narendra | en_US |
dc.contributor.author | Sharma, Som | en_US |
dc.contributor.author | Kotamarthi, V. R. | en_US |
dc.contributor.author | Kumar, K. K. | en_US |
dc.date.accessioned | 2019-04-02T06:00:26Z | - |
dc.date.available | 2019-04-02T06:00:26Z | - |
dc.date.issued | 2019-02-01 | en_US |
dc.identifier.issn | 1364-6826 | en_US |
dc.identifier.uri | http://dx.doi.org/10.1016/j.jastp.2018.12.011 | en_US |
dc.identifier.uri | http://hdl.handle.net/11536/148849 | - |
dc.description.abstract | Hight-resolved observations of vertical winds remain nearly non-existing over the Himalayas, despite of anticipated crucial role of vertical motions in transporting pollution across the Himalayan hills. The present study analyze the vertical wind observations from surface to 1 km above ground level over Manora Peak (29.4 degrees N; 79.5 degrees E; 1958 m amsl) in the Himalaya performed using a Doppler Lidar during the Ganges Valley Aerosol Experiment (GVAX). Vertical wind exhibited a pronounced diurnal variability at Manora Peak comprising of upward motions during the daytime (05-10 UT) and downward motions during nighttime typical of a mountain valley system. Mean vertical wind speeds are observed to be varying from -0.8 to + 0.8 ms(-1) during the study period with a variance of 0.1-1.5 m(2)s(-2), which is attributed to the thermally driven turbulence. Mean vertical winds are observed to be stronger in the Doppler Lidar profiles above Manora Peak (-0.8 to 0.8 ms(-1)) as compared to near surface measurements at this station using an ultrasonic anemometer (-0.4 to 0.4 ms(-1)), and low altitude stations in India. Daytime vertical wind speeds are observed to be higher during pre-monsoon (0.81 ms(-1)), as compared to post-monsoon (0.24 ms(-1)) and winter (0.33 ms(-1)). Average Black Carbon (BC) concentrations are significantly higher during strong upward vertical winds, which indicates efficient transport of polluted air mass from low-altitude regions to the Himalaya. Weather Research and Forecasting (WRF) model reproduces the observed diurnal pattern in the vertical wind at the observation site however the model underestimates the variability. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | Doppler Lidar | en_US |
dc.subject | GVAX | en_US |
dc.subject | Vertical velocity | en_US |
dc.subject | Black carbon | en_US |
dc.subject | WRF | en_US |
dc.title | Investigations of vertical wind variations at a mountain top in the Himalaya using Doppler Lidar observations and model simulations | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1016/j.jastp.2018.12.011 | en_US |
dc.identifier.journal | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | en_US |
dc.citation.volume | 183 | en_US |
dc.citation.spage | 76 | en_US |
dc.citation.epage | 85 | en_US |
dc.contributor.department | 環境工程研究所 | zh_TW |
dc.contributor.department | Institute of Environmental Engineering | en_US |
dc.identifier.wosnumber | WOS:000458224800007 | en_US |
dc.citation.woscount | 0 | en_US |
顯示於類別: | 期刊論文 |