Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-8893-2018 |
Local time dependence of polar mesospheric clouds: a model study | |
Schmidt, Francie; Baumgarten, Gerd; Berger, Uwe; Fiedler, Jens; Luebken, Franz-Josef | |
2018-06-26 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:12页码:8893-8908 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | The Mesospheric Ice Microphysics And tranSport model (MIMAS) is used to study local time (LT) variations of polar mesospheric clouds (PMCs) in the Northern Hemisphere during the period from 1979 to 2013. We investigate the tidal behavior of brightness, altitude, and occurrence frequency and find a good agreement between model and lidar observations. At the peak of the PMC layer the mean ice radius varies from 35 to 45 nm and the mean number density varies from 80 to 150 cm(-3) throughout the day. We also analyze PMCs in terms of ice water content (IWC) and show that only amplitudes of local time variations in IWC are sensitive to threshold conditions, whereas phases are conserved. In particular, relative local time variations decrease with larger thresholds. Local time variations also depend on latitude. In particular, absolute local time variations increase towards the pole. Furthermore, a phase shift exists towards the pole which is independent of the threshold value. In particular, the IWC maximum moves backward in time from 08:00 LT at midlatitudes to 02:00 LT at high latitudes. The persistent features of strong local time modulations in ice parameters are caused by local time structures in background temperature and water vapor. For a single year local time variations of temperature at 69 degrees N are in a range of +/- 3 K near 83 km altitude. At sublimation altitudes the water vapor variation is about +/- 3.5 ppmv, leading to a change in the saturation ratio by a factor of about 2 throughout the day. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000436248800001 |
WOS关键词 | NOCTILUCENT CLOUDS ; DIURNAL-VARIATIONS ; SUMMER MESOPAUSE ; ARCTIC SUMMER ; WATER-VAPOR ; SOLAR-CYCLE ; LIDAR ; ALOMAR ; TEMPERATURE ; ATMOSPHERE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/31090 |
专题 | 地球科学 |
作者单位 | Rostock Univ, Leibniz Inst Atmospher Phys, Kuhlungsborn, Germany |
推荐引用方式 GB/T 7714 | Schmidt, Francie,Baumgarten, Gerd,Berger, Uwe,et al. Local time dependence of polar mesospheric clouds: a model study[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(12):8893-8908. |
APA | Schmidt, Francie,Baumgarten, Gerd,Berger, Uwe,Fiedler, Jens,&Luebken, Franz-Josef.(2018).Local time dependence of polar mesospheric clouds: a model study.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(12),8893-8908. |
MLA | Schmidt, Francie,et al."Local time dependence of polar mesospheric clouds: a model study".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.12(2018):8893-8908. |
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