DOI: 10.1175/JCLI-D-14-00505.1
Scopus记录号: 2-s2.0-84944080856
论文题名: A detailed cloud fraction climatology of the upper indus basin and its implications for near-surface air temperature
作者: Forsythe N. ; Hardy A.J. ; Fowler H.J. ; Blenkinsop S. ; Kilsby C.G. ; Archer D.R. ; Hashmi M.Z.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 9 起始页码: 3537
结束页码: 3556
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Catchments
; Climatology
; Radiometers
; Remote sensing
; Runoff
; Satellite imagery
; Asia
; Cloud cover
; Cloud forcing
; Reanalysis
; Satellite observations
; Atmospheric temperature
; air temperature
; climate variation
; climatology
; cloud cover
; cloud radiative forcing
; diurnal variation
; MODIS
; remote sensing
; satellite imagery
; seasonal variation
; spatial variation
; Besham
; Indus Basin
; Khyber-Pakhtunkhwa
; Pakistan
英文摘要: Clouds play a key role in hydroclimatological variability by modulating the surface energy balance and air temperature. This study utilizes MODIS cloud cover data, with corroboration from global meteorological reanalysis (ERA-Interim) cloud estimates, to describe a cloud climatology for the upper Indus River basin. It has specific focus on tributary catchments in the northwest of the region, which contribute a large fraction of basin annual runoff, including 65% of flow originating above Besham, Pakistan or 50 km3 yr-1 in absolute terms. In this region there is substantial cloud cover throughout the year, with spatial means of 50%-80% depending on the season. The annual cycles of catchment spatial mean daytime and nighttime cloud cover fraction are very similar. This regional diurnal homogeneity belies substantial spatial variability, particularly along seasonally varying vertical profiles (based on surface elevation). Correlations between local near-surface air temperature observations and MODIS cloud cover fraction confirm the strong linkages between local atmospheric conditions and near-surface climate variability. These correlations are interpreted in terms of seasonal and diurnal variations in apparent cloud radiative effect and its influence on near-surface air temperature in the region. The potential role of cloud radiative effect in recognized seasonally and diurnally asymmetrical temperature trends over recent decades is also assessed by relating these locally observed trends to ERA-Interim-derived trends in cloud cover fraction. Specifically, reduction in nighttime cloud cover fraction relative to daytime conditions over recent decades appears to provide a plausible physical mechanismfor the observed nighttime cooling of surface air temperature in summermonths. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50501
Appears in Collections: 气候变化事实与影响
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作者单位: Water Resources Systems Research Laboratory, School of Civil Engineering and Geosciences, Newcastle University, Newcastle, United Kingdom; Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; JBA Consulting Engineers and Scientists, Skipton, United Kingdom; Global Change Impacts Studies Centre, Islamabad, Pakistan
Recommended Citation:
Forsythe N.,Hardy A.J.,Fowler H.J.,et al. A detailed cloud fraction climatology of the upper indus basin and its implications for near-surface air temperature[J]. Journal of Climate,2015-01-01,28(9)