DOI: 10.1002/2013JD020717
论文题名: Impact of land use change on the diurnal cycle climate of the Canadian Prairies
作者: Betts A.K. ; Desjardins R. ; Worth D. ; Cerkowniak D.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 11996
结束页码: 12011
语种: 英语
英文关键词: agricultural land use
; Canadian Prairies
; cloud radiative forcing
; diurnal cycle
; land-atmosphere coupling
; seasonal cycle
Scopus关键词: Atmospheric radiation
; Cultivation
; Land use
; Transpiration
; Water supply
; Agricultural land use
; Canadian prairie
; Cloud radiative forcing
; Diurnal cycle
; Land-atmosphere couplings
; Seasonal cycle
; Precipitation (meteorology)
; air temperature
; cloud cover
; cloud radiative forcing
; diurnal variation
; growing season
; land use change
; prairie
; relative humidity
; seasonal variation
; Canada
; Saskatchewan
英文摘要: This paper uses hourly observations from 1953 to 2011 of temperature, relative humidity, and opaque cloud cover from 14 climate stations across the Canadian Prairies to analyze the impact of agricultural land use change on the diurnal cycle climate, represented by the mean temperature and relative humidity and their diurnal ranges. We show the difference between the years 1953-1991 and 1992-2011. The land use changes have been largest in Saskatchewan where 15-20% of the land area has been converted in the past four decades from summer fallow (where the land was left bare for 1 year) to annual cropping. During the growing season from 20 May to 28 August, relative humidity has increased by about 7%. During the first 2 months, 20 May to 19 July, maximum temperatures and the diurnal range of temperature have fallen by 1.2°C and 0.6°C, respectively, cloud cover has increased by about 4%, reducing surface net radiation by 6 W m-2, and precipitation has increased. We use the dry-downs after precipitation to separate the impact of cloud cover and show the coupling between evapotranspiration and relative humidity. We estimate, using reanalysis data from ERA-Interim, that increased transpiration from the larger area of cropland has reduced the surface Bowen ratio by 0.14-0.2. For the month on either side of the growing season, cloud cover has fallen slightly; maximum temperatures have increased, increasing the diurnal temperature range and the diurnal range of humidity. Key Points Increased annual cropping has cooled and moistened the summer climate More transpiration has increased precipitation and lowered cloud base Changing seasonal diurnal temperature and humidity ranges ©2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Reproduced with permission of the Minister of Agriculture and Agri-Food Canada. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63197
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Atmospheric Research, Pittsford, VT 05763, United States; Agriculture and Agri-Food Canada, Ottawa, ON, Canada; Agriculture and Agri-Food Canada, Saskatoon, SK, Canada
Recommended Citation:
Betts A.K.,Desjardins R.,Worth D.,et al. Impact of land use change on the diurnal cycle climate of the Canadian Prairies[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)