DOI: 10.1002/joc.5854
Scopus记录号: 2-s2.0-85054193171
论文题名: The ability of moderate resolution imaging spectroradiometer land surface temperatures to simulate cold air drainage and microclimates in complex Arctic terrain
作者: Pepin N.C. ; Pike G. ; Read S. ; Williams R.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
卷: 39, 期: 2 起始页码: 953
结束页码: 973
语种: 英语
英文关键词: cold air drainage
; local or boundary layer scale
; MODIS land surface temperature
; mountain climate
; polar
; remote sensing
; surface-based observations
Scopus关键词: Boundary layers
; Climatology
; Complex networks
; Landforms
; Radiometers
; Remote sensing
; Satellite imagery
; Spectrometers
; Surface measurement
; Surface properties
; Cold air
; Land surface temperature
; local or boundary layer scale
; mountain climate
; polar
; Surface-based
; Atmospheric temperature
; boundary layer
; cold air
; drainage
; image resolution
; land surface
; microclimate
; MODIS
; remote sensing
; surface temperature
; Finland
; Kevo
; Lappi [Finland]
英文摘要: The Arctic has experienced the most rapid warming in the world in recent decades. Complex topography combines with low solar elevation to create distinct microclimates in Arctic regions, and for many applications such as ecological response and cryospheric change it is critical to obtain reliable temperature trends at the local scale. Due to lack of weather stations, satellite land surface temperature (LST) is increasingly important as a proxy for air temperature (T air ), but how accurately it can represent microclimates is unknown. For the first time, we compare 10 years (2007–2017) of T air recorded over a dense network of 65 sites (~25 km 2 ) around Kevo Subarctic Research Station in Finland with equivalent moderate resolution imaging spectroradiometer (MODIS) LST at 1 km resolution from MOD11A2/MYD11A2 8-day products. We assess whether LST can pick up the extreme local gradients in air temperature (>20 °C/km) caused by cold air drainage. Although there is a high correspondence between LST and T air anomalies on a synoptic timescale, small-scale patterns in T air (lapse rates, aspect contrasts) are not picked up by LST. Temperature gradients in T air become positive (temperature inversions) in winter, and at night, but LST gradients show almost the reverse. Aspect contrasts in T air peak in spring and autumn during the day, but LST shows biggest differences in the evening. Land cover has a large influence on LST, tundra heating up/cooling down more than birch or pine forest. The conflation between land cover and elevation means that differential land-cover response dominates the elevational LST signal. Contrasts between T air and LST cannot be explained by the number of stations measuring T air in a pixel, elevation error, timing differences or the frequency of cloud cover within the 8-day composite. Important features of the Arctic climate such as microscale cold air drainage are thus potentially obscured by land-cover effects. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116568
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Geography, University of Portsmouth, Portsmouth, United Kingdom; Kevo Subarctic Research Station, University of Turku, Turku, Finland; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Pepin N.C.,Pike G.,Read S.,et al. The ability of moderate resolution imaging spectroradiometer land surface temperatures to simulate cold air drainage and microclimates in complex Arctic terrain[J]. International Journal of Climatology,2019-01-01,39(2)