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Intra-seasonal contrasting trends in clouds due to warming induced circulation changes
S S Prijith1, C B Lima2, M V Ramana2
1National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad, 500037, India. prijithss@gmail.com.
Scientific Reports
|August 21, 2021
Summary
Climate change impacts cloud patterns over the Northwest Indian Ocean. Cloud top height (CTH) initially decreases then increases, affecting monsoon rainfall and requiring accurate climate model representation.
Area of Science:
- Atmospheric Science
- Climate Science
- Meteorology
Background:
- Long-term cloud changes are crucial for climate change assessment.
- Understanding cloud dynamics is vital for accurate climate projections.
Purpose of the Study:
- To investigate contrasting trends in cloud properties and radiative effects over the Northwest Indian Ocean (NWIO) during the South Asian summer monsoon.
- To analyze the influence of atmospheric circulation changes on these cloud trends.
Main Methods:
- Analysis of cloud top height (CTH) trends across different months (June-September).
- Investigation of upper tropospheric wind patterns and atmospheric circulation changes.
- Examination of horizontal wind shifts and the Indian Ocean Walker cell's role.
Main Results:
- CTH decreased in June and July but increased significantly in August and September.
- Strengthening upper tropospheric easterlies and altered vertical winds initially suppressed cloud development.
- Weakening winds, enhanced updrafts, and a strengthened Indian Ocean Walker cell promoted cloud growth and westward spread in August.
Conclusions:
- Intra-seasonal contrasting cloud trends over NWIO are driven by atmospheric circulation shifts.
- These cloud changes impact monsoon rainfall patterns over India.
- Accurate representation of these trends in climate models is essential for improved regional weather predictions.
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