DOI: 10.1016/j.atmosres.2017.10.010
Scopus记录号: 2-s2.0-85034060693
论文题名: Characteristics of cloud occurrence using ceilometer measurements and its relationship to precipitation over Seoul
作者: Lee S. ; Hwang S.-O. ; Kim J. ; Ahn M.-H.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 201 起始页码: 46
结束页码: 57
语种: 英语
英文关键词: Ceilometer
; Cloud base height
; Cloud occurrence
; Cloud vertical frequency
; Microwave radiometer
Scopus关键词: Meteorological instruments
; Microwave devices
; Microwave measurement
; Radiometers
; Atmospheric conditions
; Ceilometer
; Cloud-base height
; Comprehensive analysis
; Frequency distributions
; Ground-based observations
; Meteorological station
; Microwave radiometers
; Precipitation (meteorology)
; cloud
; diurnal variation
; ground-based measurement
; microwave radiometer
; observational method
; precipitation (climatology)
; temporal analysis
; trend analysis
; Seoul [South Korea]
; South Korea
英文摘要: Clouds are an important component of the atmosphere that affects both climate and weather, however, their contributions can be very difficult to determine. Ceilometer measurements can provide high resolution information on atmospheric conditions such as cloud base height (CBH) and vertical frequency of cloud occurrence (CVF). This study presents the first comprehensive analysis of CBH and CVF derived using Vaisala CL51 ceilometers at two urban stations in Seoul, Korea, during a three-year period from January 2014 to December 2016. The average frequency of cloud occurrence detected by the ceilometers is 54.3%. It is found that the CL51 is better able to capture CBH as compared to another ceilometer CL31 at a nearby meteorological station because it could detect high clouds more accurately. Frequency distributions for CBH up to 13,000 m providing detailed vertical features with 500-m interval show 55% of CBHs below 2 km for aggregated CBHs. A bimodal frequency distribution was observed for three-layers CBHs. A monthly variation of CVF reveals that frequency concentration of lower clouds is found in summer and winter, and higher clouds more often detected in spring and autumn. Monthly distribution features of cloud occurrence and precipitation are depending on seasons and it might be easy to define their relationship due to higher degree of variability of precipitation than cloud occurrence. However, a fluctuation of cloud occurrence frequency in summer is similar to precipitation in trend, whereas clouds in winter are relatively frequent but precipitation is not accompanied. In addition, recent decrease of summer precipitation could be mostly explained by a decrease of cloud occurrence. Anomalous precipitation recorded sometimes is considerably related to corresponding cloud occurrence. The diurnal and daily variations of CBH and CVF from ceilometer observations and the analysis of microwave radiometer measurements for two typical cloudiness cases are also reviewed in parallel. This analysis in finer temporal scale exhibits that utilization of ground-based observations together could help to analyze the cloud behaviors. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108994
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Meteorological Observation Laboratory, Weather Information Service Engine, Hankuk University of Foreign Studies, Yongin-si, Gyeonggi-do 17035, South Korea; Department of Atmospheric Science, Yonsei University, Yonsei-ro 50, Seodaemun-gu, Seoul, 03722, South Korea; Department of Atmospheric Science and Engineering, Ewha Womans University, Ewha-Yeodae-Gil 52, Seodaemun-gu, Seoul, South Korea
Recommended Citation:
Lee S.,Hwang S.-O.,Kim J.,et al. Characteristics of cloud occurrence using ceilometer measurements and its relationship to precipitation over Seoul[J]. Atmospheric Research,2018-01-01,201