气候变化领域集成服务门户(CCPortal): Mapping water vapour variability over a mountainous tropical island using InSAR and an atmospheric model for geodetic observations

CCPortal

DOI	10.1016/j.rse.2019.111560
	Mapping water vapour variability over a mountainous tropical island using InSAR and an atmospheric model for geodetic observations
	Webb T.L.; Wadge G.; Pascal K.
发表日期	2020
ISSN	00344257
卷号	237
英文摘要	The three dimensional distribution of water vapour around mountainous terrain can be highly variable. This variability can in turn affect local meteorological processes and geodetic techniques to measure ground surface motion. We demonstrate this general problem with the specific issues of a small tropical island, Montserrat. Over a period of 17 days in December 2014 we made observations using InSAR and GPS techniques, together with concurrent atmospheric models using the WRF code. Comparative studies of water vapour distribution and its effect on refractivity were made at high spatial resolution (300 m) over short distances (~10 km). Our results show that model simulations of the observed differences in water vapour distribution using WRF is insufficiently accurate. We suggest that better use could be made of the knowledge and observations of local water vapour conditions at different scales, specifically the Inter Tropical Convergence Zone (ITCZ), the trade wind fields and the mountain flow (~30 m) perhaps using eddy simulation. The annual perturbations of the ITCZ show that the range of humidity is approximately the same expressed as the differential phase of InSAR imaging (~100 mm). Trade wind direction and speed are particularly important at high wind speeds driving vigorous asymmetrical convection over the island's mountains. We also show that the slant angles of radar can follow distinct separate paths through the water vapour field. Our study is novel in demonstrating how synoptic-scale features and climate can advise the modelling of mesoscale systems and sub-seasonal InSAR imaging on tropical islands. © 2019 Elsevier Inc.
英文关键词	InSAR; ITCZ; Mountainous tropical island; Water vapour
语种	英语
scopus关键词	Atmospheric humidity; Commerce; Geodesy; Landforms; Synthetic aperture radar; Tropics; Water vapor; High spatial resolution; InSAR; Intertropical convergence zone; ITCZ; Small tropical islands; Tropical island; Water vapour; Water-vapour variability; Water conservation; atmospheric convection; GPS; humidity; intertropical convergence zone; large eddy simulation; radar imagery; radar interferometry; spatial resolution; trade wind; water vapor; wind direction; Leeward Islands [Lesser Antilles]; Montserrat
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179522
作者单位	Department of Meteorology, University of Reading, United Kingdom; Laboratoire d'Aérologie, Observatoire Midi-Pyrénées, Toulouse, France; Montserrat Volcano Observatory, Montserrat; Seismic Research Centre, University of the West Indies, Trinidad and Tobago
推荐引用方式 GB/T 7714	Webb T.L.,Wadge G.,Pascal K.. Mapping water vapour variability over a mountainous tropical island using InSAR and an atmospheric model for geodetic observations[J],2020,237.
APA	Webb T.L.,Wadge G.,&Pascal K..(2020).Mapping water vapour variability over a mountainous tropical island using InSAR and an atmospheric model for geodetic observations.Remote Sensing of Environment,237.
MLA	Webb T.L.,et al."Mapping water vapour variability over a mountainous tropical island using InSAR and an atmospheric model for geodetic observations".Remote Sensing of Environment 237(2020).