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Land-sea thermal contrast associated with summer monsoon onset over the Chao Phraya River basin
| Title: | Land-sea thermal contrast associated with summer monsoon onset over the Chao Phraya River basin |
| Authors: | Yamada, Tomohito J. Browse this author →KAKEN DB | | Shrivastava, Sourabh Browse this author | | Kato, Ryosuke Browse this author |
| Issue Date: | Oct-2022 |
| Publisher: | Springer |
| Journal Title: | Theoretical and Applied Climatology |
| Volume: | 150 |
| Issue: | 1-2 |
| Start Page: | 73 |
| End Page: | 83 |
| Publisher DOI: | 10.1007/s00704-022-04131-3 |
| Abstract: | Earlier onset of the Southeast Asian summer monsoon (SAM) was observed over the Chao Phraya River basin in Thailand using Thai Meteorological Department-derived high-resolution merged rainfall data from 1981 to 2016. SAM variability depends on numerous local and global factors, including thermal conditions over the Bay of Bengal (BoB) and Tibetan Plateau (TbT). Despite tremendous past research efforts, the effect of thermal heat contrast on the SAM remains unclear. Using observational and reanalysis datasets, we found that the absolute value of total heat over the BoB was increasing. However, the interannual variability of total heat was greater over the TbT. Changes in surface temperature (+/- 1.5 degrees C), air thickness (+/- 20 m), and geopotential height over the TbT were associated with the timing of SAM onset. The results also suggested that significant changes in air thickness are driven by surface temperature differences over the TbT, while changes in the integrated apparent heat source and integrated apparent moisture sink of +/- 100 W m(-2) resulted in anomalous convective activities over the BoB and mainland of the Indochina Peninsula in years of early and late SAM onset. At the intraseasonal timescale, Madden-Julian oscillation (MJO) was observed over the Indian Ocean and Western Hemisphere for 4-10 days in years of early SAM onset. The opposite situation was found for years of late SAM onset, with MJO located over the Western Pacific Ocean and Maritime Continent. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86807 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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