Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
A hemispheric dust storm affecting the Atlantic and Mediterranean in April 1994: Analyses, modeling, ground-based measurements and satellite observations
Date
2001-08-27
Author
Ozsoy, E
Kubilay, N
Nickovic, S
Moulin, C
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
236
views
0
downloads
Cite This
One of the largest recorded dust tranpsort events originating from the great Sahara desert during April 1994 affected the entire region extending from the Caribbean to the Eurasian continent. This hemispherical transport of airborne dust took place during a series of storms that developed during the first three weeks of April in a background of low-index circulation. These repeated events are studied through the combined analyses and interpretation of atmospheric data, ground-based aerosol measurements, visibility observations, AVHRR and Meteosat visible band satellite data, and the results of Eta model simulations, including an aerosol transport component. The observations produce a consistent picture of the temporal and spatial development of the dust events, whose main features are used in parts to verify the model results. The rate of dust suspension from some areas of the western Sahara desert exceeded 1.5 mg m(-2) h(-1) and the maximum column integrated dust load reached 2 g m(-2) during April 3-5 1994, when the first major suspension event produced two simultaneous pulses of dust moving in opposite directions across the subtropical Atlantic Ocean and the eastern Mediterranean Sea. These dust suspensions were created by surface winds resulting from subsidence on the northeastern side of a blocking anticyclone in the Atlantic region and subsequent winds of an intense developing cyclone in the Mediterranean-African region. In the following period, maximum dust loads of 4.5 and 2.5 g m(-2) occurred on April 12 and 17, respectively, when new cyclones transported dust across the Mediterranean from Africa to Europe. The generation of the two dust pulses during the first even and the recurrent cyclone transport in the following period is shown to be the result of a large-scale, anomalous atmospheric circulation connected with blocking in the Atlantic Ocean and the interactions of tipper air jets downstream of the blocking. The particular state of the hemispheric circulation during the studied period corresponded to the positive phase of the North Atlantic Oscillation (NAO). While previous statistical evidence has consistently linked dust transport in the region with the NAO signatures, we show the same connection on the basis of this case study.
Subject Keywords
Earth-Surface Processes
,
Ecology
,
Earth and Planetary Sciences (miscellaneous)
,
Space and Planetary Science
,
Palaeontology
,
Forestry
,
Aquatic Science
,
Atmospheric Science
,
Soil Science
,
Geochemistry and Petrology
,
Geophysics
,
Oceanography
,
Water Science and Technology
URI
https://hdl.handle.net/11511/67879
Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
DOI
https://doi.org/10.1029/2000jd900796
Collections
Graduate School of Marine Sciences, Article
Suggestions
OpenMETU
Core
Paleomagnetic evidence for upper plate response to a STEP fault, SW Anatolia
Kaymakcı, Nuretdin; ÖZKAPTAN, MURAT; Özacar, Atilla Arda; UZEL, BORA; SÖZBİLİR, HASAN (Elsevier BV, 2018-09-15)
Pliny-Strabo Trench is a Subduction Transform-Edge Propagator (STEP) Fault developed on the northern edge of the subducted African Oceanic Lithosphere. It connects the Aegean and Cyprian trenches in the Eastern Mediterranean convergent system. Although, deep geometry of the STEP fault and associated slab tear in mantle are imaged, its shallow vertical and lateral continuation in the crust and impact on the over-riding plate are still unknown. Thus, we have studied SW Anatolia, the candidate site where this ...
THE UPPER LAYER CIRCULATION OF THE BLACK-SEA - ITS VARIABILITY AS INFERRED FROM HYDROGRAPHIC AND SATELLITE-OBSERVATIONS
OGUZ, T; LAVIOLETTE, PE; UNLUATA, U (American Geophysical Union (AGU), 1992-08-15)
Quasi-synoptic hydrographic data and satellite imagery are used to describe the circulation and the structural variability of the Black Sea with particular emphasis on the Turkish coast. The circulation is indicated to involve a variable cyclonic circulation with no apparent central locus and a well-defined cyclonic "Rim Current" containing meanders and interacting eddy fields confined to the shelf slope. Interspersed between the coastal eddies are filaments and intense jets, often with dipole eddies at the...
Tsunamis in the Black Sea: Comparison of the historical, instrumental, and numerical data
Yalçıner, Ahmet Cevdet; Talipova, T; Kurkin, A; Kozelkov, A; Zaitsev, A (American Geophysical Union (AGU), 2004-12-15)
The tsunami hazard in the Black Sea is discussed by comparing historical, instrumental data and numerical results. There are 22 tsunami events in the Black Sea documented since the first century, and nine of them have occurred in twentieth century. The numerical simulations of tsunami propagation for the 1966 and 1939 events are performed by using the framework of the shallow-water theory. The instrumental data from tide gauge records are used to compare and validate the simulation results and estimate the ...
Flood forecasting and analysis within the Ulus Basin, Turkey, using geographic information systems
Usul, Nurunnisa; Turan, Burak (Springer Science and Business Media LLC, 2006-10-01)
Floods have been the most severe natural disasters in the West Black Sea Region of Turkey for many years; therefore Ulus Basin is selected as a study area for a thorough hydrologic flood analysis. The lack of embankments around the Ulus River and careless changes to the riverbed made by villagers, resulted in major flood events in the basin, causing significant damage in the area. In this study, the hydrodynamic characteristics of the basin and the riverbed are determined by calibrating the hydraulic module...
Modeling the response of top-down control exerted by gelatinous carnivores on the Black Sea pelagic food web
Oguz, T; Ducklow, HW; Purcell, JE; Malanotte-Rizzoli, P (American Geophysical Union (AGU), 2001-03-15)
Recent changes in structure and functioning of the interior Black Sea ecosystem are studied by a series of simulations using a one-dimensional, vertically resolved, coupled physical-biochemical model. The simulations are intended to provide a better understanding of how the pelagic food web structure responds to increasing grazing pressure by gelatinous carnivores (medusae Aurelia aurita and ctenophore Mnemiopsis leidyi) during the past 2 decades. The model is first shown to represent typical eutrophic ecos...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
E. Ozsoy, N. Kubilay, S. Nickovic, and C. Moulin, “A hemispheric dust storm affecting the Atlantic and Mediterranean in April 1994: Analyses, modeling, ground-based measurements and satellite observations,”
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
, pp. 18439–18460, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67879.