On the role of the Planetary Boundary Layer in the numerical simulation of a severe cyclonic storm Nargis using a mesoscale model. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors.
The difference in heating and cooling and the ensuing pressure gradient is what drives this jet. Dynamics of the Low-Level Westerly Jet Over West Africa. Geophysics, Geomagnetism [1], The mid-level African easterly jet is considered to play a crucial role in the southwest monsoon of Africa,[3] and helps form the tropical waves that move across the tropical Atlantic and eastern Pacific oceans during the warm season. [7] We computed cc between the absolute VWS and the frequency of STS for the period 1950–2007.
Recent unprecedented weakening of Indian summer monsoon in warming environment. Tropical waves last from a couple of days to several weeks, with new waves forming every few days.
Journal of Geophysical Research: Atmospheres.
The scale of STS is the same as the shear except for the units. The jet moves northward from its south-most location in January, reaching its most northerly latitude in August. [13] The TEJ strength during the summer monsoon period of June through September shows a strong decreasing trend in recent years. In a recent study, Rao et al. National Oceanic and Atmospheric Administration, https://en.wikipedia.org/w/index.php?title=African_easterly_jet&oldid=978324806, Creative Commons Attribution-ShareAlike License, This page was last edited on 14 September 2020, at 06:36. Tropical Easterly Jet Stream occurs near the tropopause over Southeast Asia, India, and Africa during summer. All the values are means for the 4‐month season: June, July, August and September, and for the period 1950 through 2007. Geology and Geophysics, Physical
It is known that tropical cyclones of hurricane intensity occur in the north Indian ocean basin only during the pre and post monsoon period. Also the sea surface temperatures (SSTs) for the north Indian ocean were obtained from http://jisao.washington.edu/data_stes/#surface_temperature_gridded_data_sets. Its strongest winds are in September while it begins shifting back towards the equator. Related to Geologic Time, Mineralogy By June, it shifts northward into northwest Africa. The jet's maximum wind speeds are at a height of 3 kilometres (1.9 mi).
Impact of aerosols on tropical cyclone-induced precipitation over the mainland of China.
Thus, the purpose of the present paper is to investigate the relationship between the decrease in easterly shear associated with the weakening of TEJ strength and the formation of STS in this region. [8] Table 1 shows the correlation between the absolute VWS (the average of 4‐month season: June, July, August and September) over two different layers and frequency of depressions and STS for the period 1950–2007.
The TEJ is a typical characteristic of the north Indian ocean summer climate. There is a strong negative correlation (significant at 99.9% confidence level) between the absolute easterly shear and the number of severe storms suggesting that a decrease in easterly shear is favorable for the formation of more severe storms.
That is, the decrease of VWS associated with weakening of TEJ is favorable for the higher number of STS and lower number of depressions.
Arabian Sea tropical cyclones intensified by emissions of black carbon and other aerosols. The temperature contrast between the Sahara Desert and the Gulf of Guinea causes the jet to form to the north of the monsoon trough. Continuous lines show the 200 hPa geopotential height in meters. lower shear is favorable for the higher number of STS.
Oceanography, Interplanetary The result is a strong area of high altitude winds commonly called the African Easterly Jet. (1896-1977), Chinese Journal of Geophysics (2000-2018), International This suggests that if the present decreasing trend of TEJ intensity continues there is a strong likelihood of the formation of tropical cyclones of hurricane intensity even during the summer monsoon. Response of tropical cyclone potential intensity over the north Indian Ocean to global warming. Many tropical waves are generated by the African Easterly Jet (AEJ), an east-to-west oriented wind (much like the jet stream) that flows across Africa into the tropical Atlantic Ocean.The wind near the AEJ moves faster than the surrounding air, causing … If the jet is south of its normal location during August and September, tropical cyclogenesis is suppressed. Please check your email for instructions on resetting your password. Anomalies of vertical wind shear. Red line is the mean. Is the trend in TEJ reversing over the Indian subcontinent?. Composition and Structure, Atmospheric This jet implies a deep layer of warm air to the north of the jet and colder air to the south over the Indian Ocean.
In any case, further detailed analysis is needed to confirm these results.
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