Inter-Annual Variability of Boreal Summer Intra-Seasonal Oscillation Propagation from the Indian Ocean to the Western Pacific
Abstract
:1. Introduction
2. Data and Methods
2.1. Data
2.2. Classification of BSISO Propagation from IO to WP
- A 5–30-day lagged window after the peak of EIO ISO is used to define whether the ISO signal over the WEP and WNP originates from the EIO. The 5–30-day lagged window is selected based on the evolution of regressed BSISO for all years over the WP from day 5 to day 30 (Figure 1).
- The ratio of WEP/WNP ISO strength during this 5–30 window to EIO strength is used to detect whether the ISO originating from the EIO may propagate to the WEP or WNP for a particular year. The ratio is used to eliminate the effect of BSISO strength at origin and isolate the role of mean state.
3. Four BSISO Propagation Modes
4. Different Background Characteristics of the Four Propagation Modes
5. Conclusions and Discussion
Author Contributions
Funding
Conflicts of Interest
References
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Names of Modes | Definition | Years |
---|---|---|
Northeast (11) | SWEP/SEIO > 0.42, SWNP/SEIO > 0.36 | 1997, 1992, 1998, 1999, 2000, 2001, 2002, 2007, 2008, 2009, 2014 |
North-only (8) | SWEP/SEIO < 0.42, SWNP/SEIO > 0.36 | 1981, 1985, 1988, 1990, 2006, 2010, 2011, 2018 |
East-only (7) | SWEP/SEIO > 0.42, SWNP/SEIO < 0.36 | 1980, 1983, 1986, 1987, 1993, 2004, 2015 |
Stationary (14) | SWEP/SEIO < 0.42, SWNP/SEIO < 0.36 | 1982, 1984, 1989, 1991, 1994, 1995, 1996, 1997, 2003, 2005, 2012, 2013, 2016, 2017 |
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Zhang, J.; Wang, H.; Liu, F. Inter-Annual Variability of Boreal Summer Intra-Seasonal Oscillation Propagation from the Indian Ocean to the Western Pacific. Atmosphere 2019, 10, 596. https://doi.org/10.3390/atmos10100596
Zhang J, Wang H, Liu F. Inter-Annual Variability of Boreal Summer Intra-Seasonal Oscillation Propagation from the Indian Ocean to the Western Pacific. Atmosphere. 2019; 10(10):596. https://doi.org/10.3390/atmos10100596
Chicago/Turabian StyleZhang, Jiayu, Hui Wang, and Fei Liu. 2019. "Inter-Annual Variability of Boreal Summer Intra-Seasonal Oscillation Propagation from the Indian Ocean to the Western Pacific" Atmosphere 10, no. 10: 596. https://doi.org/10.3390/atmos10100596