DOI: 10.1002/jgrd.50548
论文题名: Combining ground-based with satellite-based measurements in the atmospheric state retrieval: Assessment of the information content
作者: Ebell K. ; Orlandi E. ; Hünerbein A. ; Löhnert U. ; Crewell S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 13 起始页码: 6940
结束页码: 6956
语种: 英语
英文关键词: information content
; infrared
; microwave
; remote sensing
; synergy
; tropospheric profiling
Scopus关键词: Infrared radiation
; Microwave devices
; Microwaves
; Remote sensing
; Satellites
; Space optics
; Troposphere
; Uncertainty analysis
; Atmospheric conditions
; Homogeneous atmospheres
; Information contents
; Remote sensing techniques
; Spinning Enhanced Visible and Infrared Imager
; synergy
; Temperature and humidities
; tropospheric profiling
; Atmospheric humidity
; assessment method
; homogeneity
; humidity
; measurement method
; microwave radiation
; monitoring
; remote sensing
; satellite imagery
; temperature profile
; troposphere
英文摘要: Remote sensing techniques offer the unique possibility to continuously and automatically monitor the atmospheric state from ground and space. Ground-based microwave radiometers (MWRs), for example, are frequently used for temperature and humidity profiling of the lower troposphere. In order to improve the profiles in the middle and upper troposphere, further information is needed. In this respect, satellite measurements are expected to be very useful. In this study, the synergy benefit in temperature and humidity clear-sky profiling using different combinations of state-of-the-art microwave and infrared ground- and satellite-based instruments is assessed. The synergy benefit is regarded as the information gain in light of ground-based MWR observations together with some climatological a priori knowledge. The maximum information content for this kind of synergy is estimated by assuming optimum conditions, e.g., no forward model uncertainties and a horizontal homogeneous atmosphere. For a midlatitude site, the ground-based MWR gives about 4.4 and 2.4 independent pieces of information on the temperature and humidity profile, respectively. For the temperature profile, the combination with Improved Atmospheric Sounding in the Infrared (IASI) and Atmospheric Microwave Sounding Unit-A/Microwave Humidity Sounder (AMSU-A/MHS) increases the information by a factor of about 1.8 and 1.5, respectively, with highest benefit in warm and/or humid conditions. The vertical information on humidity is significantly improved by highly spectrally resolved IR observations from ground or space when the atmosphere is cold and dry; the vertical information is more than tripled. If measurements from AMSU-A/MHS, IASI, or Spinning Enhanced Visible and Infrared Imager are included, retrieval uncertainties in the middle and upper troposphere are significantly reduced by up to 68%. Key Points Satellite sensors complement ground based T and q profile information Doubling (tripling) of ground based MWR information on T (q) through synergy Magnitude of synergy benefit depends on atmospheric condition ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63563
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: Institute for Geophysics and Meteorology, University of Cologne, Zülpicher Str. 49a, DE-50674 Cologne, Germany; Institute for Tropospheric Research, Leipzig, Germany
Recommended Citation:
Ebell K.,Orlandi E.,Hünerbein A.,et al. Combining ground-based with satellite-based measurements in the atmospheric state retrieval: Assessment of the information content[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)