Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/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
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
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 |
推荐引用方式 GB/T 7714 | 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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