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the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Intraseasonal variations of upper tropospheric water vapor in Asian monsoon region
Abstract. This study investigates intraseasonal oscillations (ISOs) of upper tropospheric water vapor (UTWV) in the Asian monsoon region in boreal summer by using data with high spatial and temporal resolution from the AIRS instrument. There are robust intraseasonal cycles with periods of 30–60 days and 10–20 days in the UTWV field over both South Asia and East Asia. The 30–60-day oscillation accounts for more than 60 percent of the total variance. For the 30–60-day mode, the source and propagating signature of the UTWV disturbances are distinct in two monsoon sub-systems. Two patterns in the 30–60 day oscillation are seen: a South Asian pattern that originates on the western side of the Arabian Sea and moves eastward, and an East Asian pattern that develops over West Pacific and moves westward. The 10–20-day mode exhibits a uniform westward propagating signature from West Pacific to the Arabian Sea. The Asian summer monsoon region is identified as a main source for UTWV, so another special interest in this study is the relationship between monsoon activity and the 30–60-day oscillation of UTWV. The data show that the upper troposphere is moistened following intense monsoon convection with lags about 5–10 days. An examination of the low level circulation reveals that wet and dry periods in UTWV are closely related to active and break (inactive) periods in monsoon convection, suggesting that the Asian summer monsoon plays an important role in the intraseasonal variations of UTWV. Similar variability is seen in water vapor from European Center for Medium-Range Weather Forecasts (ECMWF) analyses.
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RC S3655: 'review of intraseasonal variations', Anonymous Referee #2, 10 Oct 2006
- AC S4277: 'Response to comments of reviewer #2', Ruifen Zhan, 02 Nov 2006
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RC S3812: 'Review Zhan et al.', Anonymous Referee #1, 15 Oct 2006
- AC S4271: 'Response to comments of reviewer #1', Ruifen Zhan, 02 Nov 2006
-
RC S3655: 'review of intraseasonal variations', Anonymous Referee #2, 10 Oct 2006
- AC S4277: 'Response to comments of reviewer #2', Ruifen Zhan, 02 Nov 2006
-
RC S3812: 'Review Zhan et al.', Anonymous Referee #1, 15 Oct 2006
- AC S4271: 'Response to comments of reviewer #1', Ruifen Zhan, 02 Nov 2006
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Cited
10 citations as recorded by crossref.
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- Comparison of the structure and evolution of intraseasonal oscillations before and after onset of the Asian summer monsoon Y. Qi et al. 10.1007/s13351-013-0511-2
- Upper Tropospheric Water Vapor Transport from Indian to Sahelian Regions A. Sy et al. 10.3390/atmos9100403
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- Influence of atmospheric heat sources over the Tibetan Plateau and the tropical western North Pacific on the inter-decadal variations of the stratosphere-troposphere exchange of water vapor R. Zhan & J. Li 10.1007/s11430-008-0082-8
- Another look at influences of the Madden-Julian Oscillation on the wintertime East Asian weather J. He et al. 10.1029/2010JD014787
- A Study of the Free Tropospheric Humidity Interannual Variability Using Meteosat Data and an Advection–Condensation Transport Model H. Brogniez et al. 10.1175/2009JCLI2963.1
- Dominant Modes of Subseasonal Variability of East Asian Summertime Surface Air Temperature and Their Predictions P. Liang et al. 10.1175/JCLI-D-17-0368.1