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Published on: June 13, 2020
Middle east warming in spring enhances summer rainfall over Pakistan.
Baosheng Li1,2, Lei Zhou3,4, Jianhuang Qin2,5
1State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China.
Springtime land warming in the Middle East intensifies rainfall over Pakistan by 46%, increasing flood risks. This warming shifts the monsoon low-level jet northward, enhancing moisture supply and flood potential.
Area of Science:
- Climate Science
- Atmospheric Science
- Hydrology
Background:
- Monsoon regions are sensitive to climate change, with Pakistan highly vulnerable to heavy rainfall and floods.
- Recent floods in Pakistan, exacerbated by global warming, highlight the need to understand underlying mechanisms.
Purpose of the Study:
- To investigate the mechanisms driving frequent floods in Pakistan.
- To quantify the contribution of Middle Eastern land warming to intensified rainfall in Pakistan and northwestern India.
Main Methods:
- Analysis of climate data from 1979-2022.
- Investigating the relationship between Middle Eastern land warming, sea level pressure (SLP) gradients, and low-level jet (LLJ) dynamics.
- Assessing atmospheric vorticity and moisture transport.
Main Results:
- Middle Eastern land warming during spring accounts for 46% of intensified rainfall over Pakistan and northwestern India.
- Springtime warming causes a decline in SLP, strengthening the meridional SLP gradient and altering the monsoonal LLJ.
- The northward shift of the LLJ enhances moisture supply to Pakistan, increasing flood risk.
Conclusions:
- Middle Eastern spring land warming is a key driver of intensified rainfall and flood risk in Pakistan.
- The study elucidates the atmospheric mechanisms linking land warming to increased monsoon rainfall and flooding.
- Understanding these mechanisms is crucial for climate change adaptation in vulnerable monsoon regions.
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