DOI: 10.5194/tc-10-1297-2016
Scopus记录号: 2-s2.0-84975784239
论文题名: Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series
作者: Picard G ; , Libois Q ; , Arnaud L ; , Verin G ; , Dumont M
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 3 起始页码: 1297
结束页码: 1316
语种: 英语
英文关键词: albedo
; calibration
; data processing
; equipment
; estimation method
; light intensity
; radiometer
; snow
; spectral analysis
; time series
; zenith angle
; Antarctica
; Dome Concordia
; East Antarctica
英文摘要: Spectral albedo of the snow surface in the visible/near-infrared range has been measured for 3 years by an automatic spectral radiometer installed at Dome C (75°S, 123°E) in Antarctica in order to retrieve the specific surface area (SSA) of superficial snow. This study focuses on the uncertainties of the SSA retrieval due to instrumental and data processing limitations. We find that when the solar zenith angle is high, the main source of uncertainties is the imperfect angular response of the light collectors. This imperfection introduces a small spurious wavelength-dependent trend in the albedo spectra which greatly affects the SSA retrieval. By modeling this effect, we show that for typical snow and illumination conditions encountered at Dome C, retrieving SSA with an accuracy better than 15ĝ€% (our target) requires the difference of response between 400 and 1100ĝ€nm to not exceed 2ĝ€%. Such a small difference can be achieved only by (i) a careful design of the collectors, (ii) an ad hoc correction of the spectra using the actual measured angular response of the collectors, and (iii) for solar zenith angles less than 75°. The 3-year time series of retrieved SSA features a 3-fold decrease every summer which is significantly larger than the estimated uncertainties. This highlights the high dynamics of near-surface SSA at Dome C. © Author(s) 2016. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75127
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: UGA/CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE) UMR 5183, Grenoble, France; ACE CRC, University of Tasmania, Private Bag 80, Hobart, TAS, Australia; Météo-France - CNRS, CNRM - GAME UMR 3589, Centre d'Études de la Neige, Grenoble, France; Now At: ESCER Centre, Department of Earth and Atmospheric Sciences, Université du Québec À Montréal (UQAM), Montréal, Canada
Recommended Citation:
Picard G,, Libois Q,, Arnaud L,et al. Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series[J]. Cryosphere,2016-01-01,10(3)