The modulating influence of convectively coupled equatorial waves (CCEWs) on the variability of tropical precipitation.

Lubis, Sandro Wellyanto and Jacobi, Christoph (2015) The modulating influence of convectively coupled equatorial waves (CCEWs) on the variability of tropical precipitation. Open Access International Journal of Climatology, 35 (7). pp. 1465-1483. DOI 10.1002/joc.4069.

[img]
Preview
Text
LubisJacobi_2014.pdf - Published Version

Download (6Mb) | Preview
[img] Text (Figure S1. Wavenumber-frequency spectra of TRMM daily precipitation for winter 1998 to 2009)
joc4069-sup-0001-figures1.pdf - Supplemental Material
Restricted to Registered users only

Download (404Kb) | Contact
[img] Text (Figure S2. As in Figure S1, but for spring)
joc4069-sup-0002-figures2.pdf - Supplemental Material
Restricted to Registered users only

Download (381Kb) | Contact
[img] Text (Figure S3. As in Figure S1, but for summer)
joc4069-sup-0003-figures3.pdf - Supplemental Material
Restricted to Registered users only

Download (392Kb) | Contact
[img] Text (Figure S4. As in Figure S1, but for fall.)
joc4069-sup-0004-figures4.pdf - Supplemental Material
Restricted to Registered users only

Download (384Kb) | Contact
[img] Text (S5:Lagged composite of precipitation (shading), geopotential height (contours), and wind (vectors) associated with Kelvin-wave-filtered time series of precipitation at 850 hPa during DJF. All fields are locally significant at the 95% confidence level)
joc4069-sup-0005-figures5.pdf - Supplemental Material
Restricted to Registered users only

Download (805Kb) | Contact
[img] Text (Figure S6. As in Figure S5, but for MAM)
joc4069-sup-0006-figures6.pdf - Supplemental Material
Restricted to Registered users only

Download (770Kb) | Contact
[img] Text (Figure S7. As in Figure S5, but for SON)
joc4069-sup-0007-figures7.pdf - Supplemental Material
Restricted to Registered users only

Download (863Kb) | Contact
[img] Text ( Figure S8. As in Figure S5, but for JJA)
joc4069-sup-0008-figures8.pdf - Supplemental Material
Restricted to Registered users only

Download (729Kb) | Contact
[img] Text ( Figure S9. As in Figure S5, but for DJF at 200 hPa)
joc4069-sup-0009-figures9.pdf - Supplemental Material
Restricted to Registered users only

Download (1247Kb) | Contact
[img] Text (Figure S10. As in Figure S5, but for MAM at 200 hPa)
joc4069-sup-0010-figures10.pdf - Supplemental Material
Restricted to Registered users only

Download (1294Kb) | Contact
[img] Text (Figure S11. As in Figure S5, but for JJA at 200 hPa)
joc4069-sup-0011-figures11.pdf - Supplemental Material
Restricted to Registered users only

Download (1134Kb) | Contact
[img] Text (Figure S12. As in Figure S5, but for SON at 200 hPa.)
joc4069-sup-0012-figures12.pdf - Supplemental Material
Restricted to Registered users only

Download (1168Kb) | Contact
[img] Text (S13. Lagged composite of precipitation (shading), geopotential height (contours), and wind (vectors) associated with n = 1 ER-wave-filtered time series of precipitation at 850 hPa during DJF. All fields are locally significant at the 95% confidence level)
joc4069-sup-0013-figures13.pdf - Supplemental Material
Restricted to Registered users only

Download (599Kb) | Contact
[img] Text (Figure S14. As in Figure S13, but for MAM)
joc4069-sup-0014-figures14.pdf - Supplemental Material
Restricted to Registered users only

Download (522Kb) | Contact
[img] Text (Figure S15. As in Figure S13, but for JJA)
joc4069-sup-0015-figures15.pdf - Supplemental Material
Restricted to Registered users only

Download (636Kb) | Contact
[img] Text (Figure S16. As in Figure S13, but for SON)
joc4069-sup-0016-figures16.pdf - Supplemental Material
Restricted to Registered users only

Download (605Kb) | Contact
[img] Text (S17. Lagged composite of precipitation (shading), geopotential height (contours), and wind (vectors) associated with MRG-wave-filtered time series of precipitation at 850 hPa during DJF. All fields are locally significant at the 95% confidence level)
joc4069-sup-0017-figures17.pdf - Supplemental Material
Restricted to Registered users only

Download (492Kb) | Contact
[img] Text (Figure S18. As in Figure S17, but for MAM)
joc4069-sup-0018-figures18.pdf - Supplemental Material
Restricted to Registered users only

Download (520Kb) | Contact
[img] Text (Figure S19. As in Figure S17, but for JJA)
joc4069-sup-0019-figures19.pdf - Supplemental Material
Restricted to Registered users only

Download (577Kb) | Contact
[img] Text (Figure S20. As in Figure S17, but for SON)
joc4069-sup-0020-figures20.pdf - Supplemental Material
Restricted to Registered users only

Download (578Kb) | Contact
[img] Text (S21. Lagged composite of precipitation (shading), geopotential height (contours), and wind (vectors) associated with TD-type-wave-filtered time series of precipitation at 850 hPa during DJF. All fields are locally significant at the 95% confidence level)
joc4069-sup-0021-figures21.pdf - Supplemental Material
Restricted to Registered users only

Download (192Kb) | Contact
[img] Text (Figure S22. As in Figure S21, but for MAM)
joc4069-sup-0022-figures22.pdf - Supplemental Material
Restricted to Registered users only

Download (188Kb) | Contact
[img] Text (Figure S23. As in Figure S21, but for JJA)
joc4069-sup-0023-figures23.pdf - Supplemental Material
Restricted to Registered users only

Download (292Kb) | Contact
[img] Text (Figure S24. As in Figure S21, but for SON)
joc4069-sup-0024-figures24.pdf - Supplemental Material
Restricted to Registered users only

Download (242Kb) | Contact

Supplementary data:

Abstract

A detailed examination of the Tropical Rainfall Measuring Mission (TRMM) daily estimates, merging high-quality (HQ)/infrared (IR) precipitation from 1998 to 2009, revealed the modulating influence of convectively coupled equatorial waves (CCEWs), including Kelvin, n = 1 equatorial Rossby (ER), mixed Rossby-gravity (MRG), and tropical depression (TD)-type waves, on the variability of tropical precipitation. Consistent with inviscid β-plane shallow water theory, the wave-induced convergence zones are found to be an active location for precipitation. Modulated precipitation by ER waves exhibits slow westward phase progression of approximately −4.8 m s−1, and it is distributed as a symmetric pair of off-equatorial maxima and a weak equatorial peak. MRG waves show an asymmetrically modulated precipitation distribution and a faster phase progression of about −16.1 m s−1 followed by enhanced symmetrical gyres. Peak precipitation within TD-type waves originates in the trough axis of off-equatorial vortex trains and propagates to the west at approximately −9.5 m s−1. Regarding Kelvin waves, typical positive precipitation anomalies travelling in the east–west direction occur in the maxima of low-level wind convergences, with an approximate phase progression of about 15.4 m s−1.

Variability of tropical precipitation due to CCEWs behaves relatively varied over different seasons and locations. TD-type waves exhibit more predominant impacts than other waves, with maximum impacts of up to 9.75 ± 4.54% of the total precipitation variance during boreal summer, which is three times higher than the MRG peak (2.90 ± 0.82%). On the other hand, Kelvin and n = 1 ER waves each have more prominent effects during boreal winter; up to 6.99 ± 3.30 % and 3.77 ± 1.79 %, respectively. On average, our results suggest that, although being less dominant than other tropical oscillations (e.g. ENSO, MJO), these four types of CCEWs can considerably affect precipitation by contributing up to 16–20% of the total intraseasonal (2.5–72 days) precipitation variance in the tropics.

Document Type: Article
Additional Information: WOS:000355953600021
Keywords: CCEWs; Kelvin waves; MRG waves; n = 1 Rossby waves; TD-type waves; tropical precipitation; TRMM
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/joc.4069
ISSN: 0899-8418
Date Deposited: 19 Nov 2014 10:14
Last Modified: 01 Jul 2017 23:38
URI: http://oceanrep.geomar.de/id/eprint/26035

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...