GSTDTAP  > 地球科学
DOI10.5194/acp-17-9645-2017
Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI delta D observations
Lacour, Jean-Lionel1,2,5; Flamant, Cyrille1,2; Risi, Camille1,3; Clerbaux, Cathy1,2,4; Coheur, Pierre-Francois4
2017-08-10
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2017
卷号17期号:15
文章类型Article
语种英语
国家France; Belgium; Iceland
英文摘要

The isotopic composition of water vapour in the North Atlantic free troposphere is investigated with Infrared Atmospheric Sounding Interferometer (IASI) measurements of the D = H ratio (delta D) above the ocean. We show that in the vicinity of West Africa, the seasonality of delta D is particularly strong (130 %), which is related with the influence of the Saharan heat low (SHL) during summertime. The SHL indeed largely influences the dynamic in that region by producing deep turbulent mixing layers, yielding a specific water vapour isotopic footprint. The influence of the SHL on the isotopic budget is analysed on various time and space scales and is shown to be large, highlighting the importance of the SHL dynamics on the moistening and the HDO enrichment of the free troposphere over the North Atlantic. The potential influence of the SHL is also investigated on the inter-annual scale as we also report important variations in delta D above the Canary archipelago region. We interpret the variability in the enrichment, using backward trajectory analyses, in terms of the ratio of air masses coming from the North Atlantic and air masses coming from the African continent. Finally, the interest of IASI high sampling capabilities is further illustrated by presenting spatial distributions of ffi D and humidity above the North Atlantic from which we show that the different sources and dehydration pathways controlling the humidity can be disentangled thanks to the added value of ffi D observations. More generally, our results demonstrate the utility of delta D observations obtained from the IASI sounder to gain insight into the hydrological cycle processes in theWest African region.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000407464800002
WOS关键词DATA ASSIMILATION SYSTEM ; WATER-VAPOR ; AIR LAYER ; DUST ; VALIDATION ; IASI/METOP ; TRANSPORT ; RESOLUTION ; HDO/H2O ; MAINTENANCE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/30632
专题地球科学
作者单位1.UPMC Univ Paris 06, Paris, France;
2.Univ Versailles St Quentin, LATMOS IPSL, Paris, France;
3.LMD IPSL, CNRS INSU, UMR8539, Paris, France;
4.ULB, Serv Chim Quant & Photophys, Spect Atmosphere, Brussels, Belgium;
5.Univ Iceland, Inst Earth Sci, Reykjavik, Iceland
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Lacour, Jean-Lionel,Flamant, Cyrille,Risi, Camille,et al. Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI delta D observations[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(15).
APA Lacour, Jean-Lionel,Flamant, Cyrille,Risi, Camille,Clerbaux, Cathy,&Coheur, Pierre-Francois.(2017).Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI delta D observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(15).
MLA Lacour, Jean-Lionel,et al."Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI delta D observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.15(2017).
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