Universität zu Köln

van der Linden, Roderick ORCID: 0000-0002-7364-323X and Fink, Andreas H. ORCID: 0000-0002-5840-2120 (2016). Synoptic-Dynamic Analysis of Early Dry-Season Rainfall Events in the Vietnamese Central Highlands. Mon. Weather Rev., 144 (4). S. 1509 - 1528. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1520-0493

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Abstract

The Central Highlands are Vietnam's main coffee growing region. Unusual wet spells during the early dry season in November and December negatively affect two growing cycles in terms of yield and quality. The meteorological causes of wet spells in this region have not been thoroughly studied to date. Using daily rain gauge measurements at nine stations for the period 1981-2007 in the Central Highlands, four dynamically different early dry-season rainfall cases were investigated in depth: 1) the tail end of a cold front, 2) a tropical depression-type disturbance, 3) multiple tropical wave interactions, and 4) a cold surge with the Borneo vortex. Cases 1 and 4 are mainly extratropically forced. In case 1, moisture advection ahead of a dissipating cold front over the South China Sea led to high equivalent potential temperature in the southern highland where this air mass stalled and facilitated recurrent outbreaks of afternoon convection. In this case, the low-level northeasterly flow over the South China Sea was diverted around the southern highlands by relatively stable low layers. On the contrary, low-level flow was more orthogonal to the mountain barrier and high Froude numbers and concomitant low stability facilitated the westward extension of the rainfall zone across the mountain barrier in the other cases. In case 3, an eastward-traveling equatorial Kelvin wave might have been a factor in this westward extension, too. The results show a variety of interactions of large-scale wave forcings, synoptic-convective dynamics, and orographic effects on spatiotemporal details of the rainfall patterns.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code van der Linden, Roderick UNSPECIFIED orcid.org/0000-0002-7364-323X UNSPECIFIED Fink, Andreas H. UNSPECIFIED orcid.org/0000-0002-5840-2120 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-280634
DOI:	10.1175/MWR-D-15-0265.1
Journal or Publication Title:	Mon. Weather Rev.
Volume:	144
Number:	4
Page Range:	S. 1509 - 1528
Date:	2016
Publisher:	AMER METEOROLOGICAL SOC
Place of Publication:	BOSTON
ISSN:	1520-0493
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NEAR-EQUATORIAL DISTURBANCES; MADDEN-JULIAN OSCILLATION; NORTHEASTERLY COLD SURGES; UPPER-LEVEL TROUGHS; WINTER MONEX AREA; SOUTH CHINA SEA; TROPICAL CYCLOGENESIS; INTERANNUAL VARIATION; HEAVY RAINFALL; KELVIN WAVES Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28063