Origin of the pre-tropical storm Debby (2006) African easterly wave-mesoscale convective system

Lin, Yuh-Lang; Liu, Liping; Tang, Guiqian; Spinks, James; Jones, Wilson

doi:10.1007/s00703-013-0248-6

Cited by 9 publications

(9 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…What is most interesting about the difference analysis is the area located at (15 ∘ N, 55 ∘ E). This is the same location that Lin et al (2013) investigated to be a genesis region for easterly waves because of cyclonic …”

Section: Subtropical Highs Compositesmentioning

confidence: 91%

“…The shear and curvature vorticity both strengthens to the south of the Arabian Peninsula. This can be explained by the cyclonic convergence located (15 ∘ -20 ∘ N, 50 ∘ -60 ∘ E) from the easterlies of the Arabian High over the Arabian Peninsula and the westerlies from the Indian Ocean High (Lin et al, 2013). This region is also the location of the Intertropical Convergence Zone (ITCZ).…”

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 96%

“…The most intense region of vorticity can be seen over central Africa between 0 ∘ E and 10 ∘ E. The vorticity field remains intense in East Africa and decreases slightly in the Arabian Peninsula. There exists a vorticity maximum at 10 ∘ N between 40 ∘ E and 50 ∘ E, which is a significant feature for genesis of vorticity perturbations that could lead to wave initiation once is advected into East Africa and enhanced by the Ethiopian Highlands and Darfur Mountains (Lin et al, 2013). Other features from the vorticity field include the trough located between the Saharan and Arabian Highs and vorticity field on the east quadrant of the Arabian High.…”

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 98%

“…Lin et al (2013) explored the genesis of the pre-tropical Storm Debby AEW over the Arabian Peninsula. This wave is propagated along the easterly wind at 600 mb and was enhanced by orographic forcing associated with the Ethiopian Highlands and the LWM E .…”

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 99%

“…The Arabian High serves as a maintenance mechanism for the LWM E , which, in turn, aids easterly waves propagating from a genesis area located between 45 ∘ E and 55 ∘ E along the southern coast of the Arabian Peninsula into East Africa (Lin et al, 2013). Lin et al also proposed that this genesis area of vorticity is induced by the convergence of cyclonic vorticity produced by northerly winds and southerly winds from the Highs over Arabian Peninsula and Indian Ocean.…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer

Spinks

Lin

2014

Int. J. Climatol

Self Cite

View full text Add to dashboard Cite

ABSTRACT:The North African climate is analysed for August during a 32-year period using the European Centre for Medium Range Weather Forecast (ECMWF) global data set to investigate the intensity variability at 600 mb of the subtropical highs, Africa easterly jet (AEJ) with two embedded local wind maxima, and African easterly waves over North Africa and the Arabian Peninsula. The variability of these synoptic weather systems is higher in East Africa. The most noticeable variability of intensity occurred with easterly waves. Maintenance of easterly waves from the Arabian Peninsula into East Africa is dependent on strong zonal gradients from the AEJ through shear vorticity. These zonal gradients were induced by the strengthening of the subtropical highs and the presence of a westerly jet in Central Africa and south of the Arabian Peninsula. During positive ENSO periods, these systems are generally weaker while in negative periods are stronger. The focus of this research is to investigate the role of the Arabian High and eastern local wind maximum (LWM E ) on complementing the Saharan High and western local wind maximum (LWM W ). It is found that an intense local wind maximum in East Africa helps maintain the easterly waves and their westward propagation from the Arabian Peninsula.

show abstract

Section: Subtropical Highs Compositesmentioning

confidence: 91%

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 96%

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 98%

Section: Variability Of Subtropical Highs Lwms and Easterly Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer

Spinks

Lin

2014

Int. J. Climatol

Self Cite

View full text Add to dashboard Cite

show abstract

Synoptic Systems

Cornforth

Mumba

Parker

et al. 2017

Meteorology of Tropical West Africa

View full text Add to dashboard Cite

Effects of the subtropical anticyclones over North Africa and Arabian Peninsula on the African easterly jet

Spinks

Lin

Mekonnen

2014

Intl Journal of Climatology

Self Cite

View full text Add to dashboard Cite

North African climate is analysed between 1979 and 2010 with an emphasis on August using the European Center for Medium‐Range Weather Forecast (ECMWF) global dataset to investigate the effects of the subtropical anticyclones over North Africa and the Arabian Peninsula on the African easterly jet (AEJ). It was found that the AEJ encloses a core with a local wind maximum (LWM) in both West and East Africa, in which the west LWM core has a higher zonal wind speed. The strength of both cores is distinctly different by way of thermal wind balance. As found in previous studies, the AEJ is formed through baroclinicity with influence from Saharan lower level heating along and to the north of the Intertropical Front (ITF). As there are two separate anticyclonic centres, the AEJ is maintained by the anticyclonic systems in West Africa, East Africa as well as the Arabian Peninsula. The presence of these two anticyclonic centres provides the AEJ with two separate core maxima with the western LWM located at 15°W, 17°N and the eastern LWM located at 35°E, 15°N for August.

show abstract

Origin of the pre-tropical storm Debby (2006) African easterly wave-mesoscale convective system

Cited by 9 publications

References 39 publications

Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer

Variability of the subtropical highs, African easterly jet and easterly wave intensities over North Africa and Arabian Peninsula in late summer

Synoptic Systems

Effects of the subtropical anticyclones over North Africa and Arabian Peninsula on the African easterly jet

Contact Info

Product

Resources

About