DOI: 10.1175/JCLI-D-13-00062.1
Scopus记录号: 2-s2.0-84892558217
论文题名: Multiyear cloudsat and CALIPSO observations of the dependence of cloud vertical distribution on sea surface temperature and tropospheric dynamics
作者: Nair A.K.M. ; Rajeev K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 2 起始页码: 672
结束页码: 683
语种: 英语
Scopus关键词: Altitude distributions
; Cloud-aerosol lidar and infrared pathfinder satellite observations
; Deep convective clouds
; Dynamical parameters
; Passive imagers
; Sea surface temperature (SST)
; Spatial gradients
; Vertical distributions
; Atmospheric temperature
; Oceanography
; Clouds
; CALIPSO
; cloud cover
; CloudSat
; convective cloud
; outflow
; sea surface temperature
; temperature gradient
; troposphere
英文摘要: Utilizing the synergy of the capabilities of CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) and ~4.5 years of their observations, this paper investigates the dependence of the altitude distribution and thickness of tropical clouds on sea surface temperature (SST). Variations in the altitude distribution of clouds with SST show three distinct regimes: SST < 27.5°C, 27.5° < SST<29°C, and SST>29°C. At an SST<27.5°C, the convection is rather weak, so that most of the clouds are limited to <2-km altitude with peak occurrence at 1-1.5 km. The frequency of occurrence of the low-altitude clouds as well as the prominence of the peak at ~1.5km consistently decreases for SST > 24°C. Vertical development of clouds through the 3-12-km-altitude region increases for SST > 27.5°C to achieve maximum cloud occurrence and thickness in the SST range of 29°-30.5°C. Penetration of the deep convective clouds to altitudes>15km and their frequency of occurrence increase with SST until~30°C. These observations reveal two differences with the SST dependence of total cloudiness observed using passive imager data: (i) the increase in cloudiness at an SST > 26°-27°C observed using the imager data is found to be influenced by the increase in cirrus clouds generated by deep convective outflows and is not directly driven by the local SST, and (ii) the total cloudiness does not decrease for SST > 29.5°C as observed using imagers, but weakly increases until an SST of ~30.5°C. The role of the spatial gradient of SST and atmospheric dynamical parameters in modulating the observed SST dependence of cloudiness at different SST regimes is investigated. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51100
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Space physics laboratory, Vikram sarabhai space centre, Thiruvananthapuram, India
Recommended Citation:
Nair A.K.M.,Rajeev K.. Multiyear cloudsat and CALIPSO observations of the dependence of cloud vertical distribution on sea surface temperature and tropospheric dynamics[J]. Journal of Climate,2014-01-01,27(2)