This preprint is under consideration at Theoretical and Applied Climatology. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
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Research Article
vahideh sayad
Kharazmi University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-6924-7656
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This work is licensed under a CC BY 4.0 License. Read Full License
• The Sudanese low pressure systems is one of the thermal low pressures that are formed around the Red Sea and their low-pressure lines cover the south of the Red Sea, Sudan, and Ethiopia and continue their route through the southwest of Iran and cause heavy rainfall. The common feature of all these rain systems is land surface low pressures or low altitudes of higher levels. For dynamic and thermodynamic analysis of the mechanism of precipitation caused by the Sudanese low-pressure system, the climate maps containing data of u wind, v wind, omega, Shum, slp, monthly average of northward surface stress, daily mean precipitation rate, and temperature from 1988–2020 during the cold season of the year were applied. The results show that the Sudanese low-pressure core has the largest extent in 1999, 2006, and 2011. During this period, from the Sudanese region to the upper latitudes of Iran, the element of northward surface stress had good potential. The study showed that jet streams create rivers that originate in Africa and are reinforced by Sudanese low pressure and transfer moisture to the upper atmosphere of Iran. Between the positive and negative omega contours of about 600 hPa, the horizontal moisture transfer mechanism for Iran's rainfall is created by atmospheric rivers reinforced by Sudan's moisture core. High-temperature gradients in isothermal lines in the range of 550–850 hPa also occurred on the same day. Finally, the precipitation map shows a relatively good rainfall by atmospheric river above Iran.
Keywords
Sudanese low pressure, Atmospheric river, atmospheric thermodynamics, temperature gradient, precipitation
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This preprint is under consideration at Theoretical and Applied Climatology. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
vahideh sayad
Kharazmi University
Corresponding Author
ORCiD: https://orcid.org/0000-0002-6924-7656
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 16 Mar, 2021
No community comments so far
Reviewers invited
Invitations sent on 14 Mar, 2021
Review #? received
Received 14 Mar, 2021
Editor assigned
On 14 Mar, 2021
First submitted
On 12 Mar, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Climatology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
• The Sudanese low pressure systems is one of the thermal low pressures that are formed around the Red Sea and their low-pressure lines cover the south of the Red Sea, Sudan, and Ethiopia and continue their route through the southwest of Iran and cause heavy rainfall. The common feature of all these rain systems is land surface low pressures or low altitudes of higher levels. For dynamic and thermodynamic analysis of the mechanism of precipitation caused by the Sudanese low-pressure system, the climate maps containing data of u wind, v wind, omega, Shum, slp, monthly average of northward surface stress, daily mean precipitation rate, and temperature from 1988–2020 during the cold season of the year were applied. The results show that the Sudanese low-pressure core has the largest extent in 1999, 2006, and 2011. During this period, from the Sudanese region to the upper latitudes of Iran, the element of northward surface stress had good potential. The study showed that jet streams create rivers that originate in Africa and are reinforced by Sudanese low pressure and transfer moisture to the upper atmosphere of Iran. Between the positive and negative omega contours of about 600 hPa, the horizontal moisture transfer mechanism for Iran's rainfall is created by atmospheric rivers reinforced by Sudan's moisture core. High-temperature gradients in isothermal lines in the range of 550–850 hPa also occurred on the same day. Finally, the precipitation map shows a relatively good rainfall by atmospheric river above Iran.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
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