globalchange  > 气候变化事实与影响
DOI: 10.1016/j.jag.2017.07.008
Scopus记录号: 2-s2.0-85032466476
论文题名:
Validation of MODIS integrated water vapor product against reference GPS data at the Iberian Peninsula
作者: Vaquero-Martínez J; , Antón M; , Ortiz de Galisteo J; P; , Cachorro V; E; , Costa M; J; , Román R; , Bennouna Y; S
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2017
卷: 63
起始页码: 214
结束页码: 221
语种: 英语
英文关键词: GPS ; IWV ; MODIS ; Satellite ; Validation ; Water vapor
Scopus关键词: Aqua (satellite) ; coastal zone ; GPS ; MODIS ; seasonal variation ; Terra (satellite) ; water vapor ; Iberian Peninsula
英文摘要: In this work, the water vapor product from MODIS (MODerate-resolution Imaging Spectroradiometer) instrument, on-board Aqua and Terra satellites, is compared against GPS water vapor data from 21 stations in the Iberian Peninsula as reference. GPS water vapor data is obtained from ground-based receiver stations which measure the delay caused by water vapor in the GPS microwave signals. The study period extends from 2007 until 2012. Regression analysis in every GPS station show that MODIS overestimates low integrated water vapor (IWV) data and tends to underestimate high IWV data. R2 shows a fair agreement, between 0.38 and 0.71. Inter-quartile range (IQR) in every station is around 30–45%. The dependence on several parameters was also analyzed. IWV dependence showed that low IWV are highly overestimated by MODIS, with high IQR (low precision), sharply decreasing as IWV increases. Regarding dependence on solar zenith angle (SZA), performance of MODIS IWV data decreases between 50° and 90°, while night-time MODIS data (infrared) are quite stable. The seasonal cycles of IWV and SZA cause a seasonal dependence on MODIS performance. In summer and winter, MODIS IWV tends to overestimate the reference IWV value, while in spring and autumn the tendency is to underestimate. Low IWV from coastal stations is highly overestimated (∼60%) and quite imprecise (IQR around 60%). On the contrary, high IWV data show very little dependence along seasons. Cloud-fraction (CF) dependence was also studied, showing that clouds display a negligible impact on IWV over/underestimation. However, IQR increases with CF, except in night-time satellite values, which are quite stable. © 2017
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79971
Appears in Collections:气候变化事实与影响

Files in This Item:

There are no files associated with this item.


作者单位: Departamento de Física, Universidad de Extremadura, Badajoz, Spain; Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura, Badajoz, Spain; Agencia Estatal de Meteorologia (AEMET), Valladolid, Spain; Grupo de Óptica Atmosférica, Universidad de Valladolid, Valladolid, Spain; Departamento de Física, Instituto de Ciências da Terra, Escola de Ciências e Tecnología, Universidade de Évora, Évora, Portugal; Department of Applied Physics, University of Granada, Granada, Spain; Andalusian Institute for Earth System Research (IISTA-CEAMA), Granada, Spain

Recommended Citation:
Vaquero-Martínez J,, Antón M,, Ortiz de Galisteo J,et al. Validation of MODIS integrated water vapor product against reference GPS data at the Iberian Peninsula[J]. International Journal of Applied Earth Observation and Geoinformation,2017-01-01,63
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Vaquero-Martínez J]'s Articles
[, Antón M]'s Articles
[, Ortiz de Galisteo J]'s Articles
百度学术
Similar articles in Baidu Scholar
[Vaquero-Martínez J]'s Articles
[, Antón M]'s Articles
[, Ortiz de Galisteo J]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Vaquero-Martínez J]‘s Articles
[, Antón M]‘s Articles
[, Ortiz de Galisteo J]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.