DOI: 10.1002/joc.5240
论文题名: Aerosols characteristics, trends and their climatic implications over northeast india and adjoining South Asia
作者: Dahutia P. ; Pathak B. ; Bhuyan P.K.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 3 起始页码: 1234
结束页码: 1256
语种: 英语
英文关键词: Aerosol index
; Aerosol optical depth
; Ångström exponent
Scopus关键词: Atmospheric aerosols
; Atmospheric thermodynamics
; Climate models
; Location
; Optical properties
; Ozone
; Radiometers
; Spectrometers
; Aerosol index
; Aerosol optical depths
; Aerosol-radiation interactions
; Future climate projections
; Moderate resolution imaging spectroradiometer
; Ozone monitoring instruments
; Spatiotemporal variability
; Total ozone mapping spectrometer
; Climate change
; aerosol
; cloud condensation nucleus
; optical depth
; spatial variation
; temporal variation
; trend analysis
; Bangladesh
; Bhutan
; Dhaka [Bangladesh]
; India
; Thimphu
英文摘要: Aerosol characteristics and climatic implications derived for selected locations of the north-eastern region of India and adjoining locations Thimphu (THM), Dhaka (DAC) and Banmauk between 22-30°N and 88-98°E are reported. The region is found to reveal a distinct spatio-temporal variability in aerosol distribution, with highest climatological mean aerosol optical depth at 550 nm (AOD550) at DAC (0.65 ± 0.07) and lowest at the high altitude location THM (0.19 ± 0.02). Seasonally the maximum AOD550 is observed in the pre-monsoon season. Moderate resolution imaging spectroradiometer Level-3 Collection 6 AOD550 and Ångström exponent (AE) exhibit a significant and simultaneous increasing trend in the range of ∼0.003 year− 1 to 0.012 year− 1 and ∼−0.001 year− 1 to 0.020 year− 1, respectively, during the period 2001-2014. Together with AE, increasing trend of total ozone mapping spectrometer and ozone monitoring instrument-retrieved aerosol index (∼0.001 year− 1 to 0.007 year− 1 during 1979-2014) signifies an increase in anthropogenic aerosol loading, leading to an increase in number density of cloud condensation nuclei and decrease/increase of cloud effective radius /cloud optical depth (COD). This is further associated with overall decreasing trends of rainfall rate over this complex monsoon region. A slow increase in maximum temperature (Tmax) (∼0.008 ∘C year− 1 to 0.049 ∘C year− 1) compared to that in minimum temperature (Tmin) (∼0.007 ∘C year− 1 to 0.068 ∘C year− 1) is attributed to solar dimming due to increasing aerosol loading and COD (∼0.056 year− 1 to 0.15 year− 1). A decrease in high-level cloud (CODhigh) counteracts decreasing trends of ground reaching solar radiation over a few locations, including Dibrugarh. This study is important from an aerosol radiation interaction and aerosol cloud interaction viewpoint, which facilitates in reaching a closure of model simulated present day climate change and future climate projections. © 2017 Royal Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117143
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, Dibrugarh UniversityAssam, India; Centre for Atmospheric Studies, Dibrugarh UniversityAssam, India
Recommended Citation:
Dahutia P.,Pathak B.,Bhuyan P.K.. Aerosols characteristics, trends and their climatic implications over northeast india and adjoining South Asia[J]. International Journal of Climatology,2018-01-01,38(3)