Moisture Advection by Rotational and Divergent Winds Associated with an MJO. Kazu. Yasunaga (JAMSTEC/Univ. of Toyama)
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1 Moisture Advection by Rotational and Divergent Winds Associated with an MJO Kazu. Yasunaga (JAMSTEC/Univ. of Toyama)
2 Importance of horizontal advection of qv CINDY/DYNAMO (Kerns and Chen, 2013) Frequent Intrusion of dry air and synoptic eddies MJO convection was suppressed by dry-air intrusions, and moved to the east.
3 Importance of horizontal advection of qv Simple linear model (Sobel, and Maloney,2012) Modulation of synoptic-eddy drying is included in the term (Cu D). Synoptic-eddy drying contributes to eastward propagation of the MJO.
4 Importance of horizontal advection of qv SPCAM (Pritcharda and Bretherton, 2014) Tropical moisture advection by vorticity anomalies is artificially modulated in a SPCAM. More rotational Boosting horizontal moisture advection by tropical vorticity anomalies accelerates and amplifies the simulated MJO.
5 Decomposition of horizontal velocity v q v LF component ISV component HF component LF q ISV q HF q v v v v v v rotational component divergent component ( v LF + v ISV + v HF ) q ( v LF + v ISV + v HF ) q ψ ψ ψ χ χ χ v Each term is evaluated by using reanalysis data (ERA) v
6 Methodology Linear regression between MJO rainfall anomalies, and moisture advection from a global reanalysis dataset. Power spectrum of rainfall West k East P e r i o d DATA: TRMM-3B42, ERA-Interim Period: JAN to DEC MJO rainfall anomalies back to a real space from a spectral space
7 horizontal advection of qv around the Eq. Western IO (60E) Eastern IO (90E) mid-lev. peak Mari.-Conti.(120E) Western PO (150E) weaker peak
8 Decomposition of qv adv. Western Indian Ocean(60E) LF V(div.) ISV V(div.) HF V(div.) LF V(rot.) ISV V(rot.) HF V(rot.)
9 Decomposition of qv adv. Eastern Indian Ocean(90E) LF V(div.) ISV V(div.) HF V(div.) LF V(rot.) ISV V(rot.) HF V(rot.)
10 Decomposition of qv adv. Maritime-Continent (120E) LF V(div.) ISV V(div.) HF V(div.) LF V(rot.) ISV V(rot.) HF V(rot.)
11 Decomposition of qv adv. Western Pacific Ocean (150E) LF V(div.) ISV V(div.) HF V(div.) LF V(rot.) ISV V(rot.) HF V(rot.)
12 Vertical advection of qv around the Eq. Western IO (60E) Eastern IO (90E) Mari.-Conti.(120E) Western PO (150E)
13 Western Indian Ocean(60E) Total LF omega ISV omega HF omega
14 Eastern Indian Ocean(90E) Total LF omega ISV omega HF omega
15 Maritime-Continent (120E) Total LF omega ISV omega HF omega
16 Western Pacific Ocean (150E) Total LF omega ISV omega HF omega
17 Summary(1) Horizontal wind -> 3 components (LF, ISV, and HF). LF, ISV, and HF components -> rot. and div. components. Relative importance of the horizontal advection is evaluated. Horizontal advection signals are more dominant over IO. Over the Western IO: ISV (rot.) wind Over the Eastern IO: all wind, except for LF div. wind. Over the maritime-continent: ISV (rot. and div.) winds Over the Western PO: ISV and HF (div.) winds Relative importance varies from a region to a region. Adequate evidence of synoptic eddy drying is not found.
18 Summary(2) Vertical moisture advection is much more important. Verticatal wind -> 3 components (LF, ISV, and HF). Relative importance of the vertical advection is evaluated. Vertical advection of moisture mainly results from ISV winds. Over the Eastern IO, and Western PO, LF vertical wind cannot be negligible. Environmental upward motion is important for the propagation of an MJO?
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