DOI: 10.1016/j.atmosenv.2017.08.059
Scopus记录号: 2-s2.0-85028568082
论文题名: The pulsating nature of large-scale Saharan dust transport as a result of interplays between mid-latitude Rossby waves and the North African Dipole Intensity
作者: Cuevas E ; , Gómez-Peláez A ; J ; , Rodríguez S ; , Terradellas E ; , Basart S ; , García R ; D ; , García O ; E ; , Alonso-Pérez S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167 起始页码: 586
结束页码: 602
语种: 英语
英文关键词: Atmospheric dynamics
; Dust
; MODIS AOD
; NAFDI
; Rossby waves
; Sahara
; SHL
Scopus关键词: Atmospheric aerosols
; Atmospheric movements
; Correlation methods
; Dust
; Tropics
; Atmospheric dynamics
; MODIS AOD
; NAFDI
; Rossby wave
; Sahara
; Mechanical waves
; advection
; aerosol
; air temperature
; atmospheric dynamics
; dust
; geopotential
; Indian Ocean Dipole
; MODIS
; optical depth
; Rossby wave
; seasonal variation
; troposphere
; aerosol
; Article
; atmospheric transport
; dust
; latitude
; Libyan Arab Jamahiriya
; meteorological phenomena
; mineral dust
; Morocco
; North Africa
; optical depth
; priority journal
; saharan dust
; seasonal variation
; summer
; Western Sahara
; Africa
; Atlantic Ocean
; Atlantic Ocean (North)
; Mediterranean Sea
; Morocco
; Sahara
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: It was previously shown that during August the export of Saharan dust to the Atlantic was strongly affected by the difference of the 700-hPa geopotential height anomaly between the subtropics and the tropics over North Africa, which was termed the North African Dipole Intensity (NAFDI). In this work a more comprehensive analysis of the NAFDI is performed, focusing on the entire summer dust season (June–September), and examining the interactions between the mid-latitude Rossby waves (MLRWs) and NAFDI. Widespread and notable aerosol optical depth (AOD) monthly anomalies are found for each NAFDI-phase over the dust corridors off the Sahara, indicating that NAFDI presents intra-seasonal variability and drives dust transport over both the Mediterranean basin and the North Atlantic. Those summer months with the same NAFDI-phase show similar AOD-anomaly patterns. Variations in NAFDI-phase also control the displacement of the Saharan Heat Low (SHL) westwards or eastwards through horizontal advection of temperature over Morocco-Western Sahara or eastern Algeria-Western Libya, respectively. The connection between the SHL and the NAFDI is quantified statistically by introducing two new daily indexes that account for their respective phases (NAFDI daily index -NAFDIDI-, and SHL longitudinal shift index -SHLLSI-) and explained physically using the energy equation of the atmospheric dynamics. The Pearson's correlation coefficient between the one–day-lag SHLLSI and the NAFDIDI for an extended summer season (1980–2013) is 0.78. A positive NAFDI is associated with the West-phase of the SHL, dust sources intensification on central Algeria, and positive AOD anomalies over this region and the Subtropical North Atlantic. A negative NAFDI is associated with the East-phase of the SHL, and positive AOD anomalies over central-eastern Sahara and the central-western Mediterranean Sea. The results point out that the phase changes of NAFDI at intra-seasonal time scale are conducted by those MLRWs that penetrate deeply into the low troposphere. © 2017 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82311
Appears in Collections: 气候变化事实与影响
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作者单位: Izaña Atmospheric Research Centre (AEMET), c/ La Marina 20Santa Cruz de Tenerife, Spain; SDS-WAS Regional Centre (AEMET), Edificio Nexus II, c/ Jordi Girona 29, Barcelona, Spain; Earth Sciences Department, Barcelona Supercomputing Centre, Edificio Nexus II, c/ Jordi Girona 29, Barcelona, Spain; Air Liquide S.A., Delegación de Canarias, Plaza Industrial Valle Güímar Manz, Güímar, Santa Cruz de Tenerife, Spain; Universidad Europea de Canarias, Campus de la Orotava, c/ Inocencio García 1, La Orotava, Santa Cruz de Tenerife, Spain
Recommended Citation:
Cuevas E,, Gómez-Peláez A,J,et al. The pulsating nature of large-scale Saharan dust transport as a result of interplays between mid-latitude Rossby waves and the North African Dipole Intensity[J]. Atmospheric Environment,2017-01-01,167