scholarly journals Phase locking between atmospheric convectively coupled equatorial Kelvin waves and the diurnal cycle of precipitation over the Maritime Continent

2016 ◽  
Vol 43 (15) ◽  
pp. 8269-8276 ◽  
Author(s):  
Dariusz B. Baranowski ◽  
Maria K. Flatau ◽  
Piotr J. Flatau ◽  
Adrian J. Matthews
Keyword(s):  
Diurnal Cycle ◽  
Phase Locking ◽  
Kelvin Waves ◽  
Maritime Continent ◽  
Diurnal Cycle Of Precipitation

scholarly journals On the Sensitivity of the Simulated Diurnal Cycle of Precipitation to 3-Hourly Radiosonde Assimilation: A Case Study over the Western Maritime Continent

2021 ◽  
Vol 149 (10) ◽  
pp. 3449-3468
Author(s):  
Joshua Chun Kwang Lee ◽  
Anurag Dipankar ◽  
Xiang-Yu Huang
Keyword(s):  
Diurnal Cycle ◽  
High Frequency ◽  
Initial Conditions ◽  
Rainfall Variability ◽  
Weather Prediction ◽  
Radiosonde Data ◽  
Western Coast ◽  
Maritime Continent ◽  
Model Biases ◽  
Diurnal Cycle Of Precipitation

AbstractThe diurnal cycle is the most prominent mode of rainfall variability in the tropics, governed mainly by the strong solar heating and land–sea interactions that trigger convection. Over the western Maritime Continent, complex orographic and coastal effects can also play an important role. Weather and climate models often struggle to represent these physical processes, resulting in substantial model biases in simulations over the region. For numerical weather prediction, these biases manifest themselves in the initial conditions, leading to phase and amplitude errors in the diurnal cycle of precipitation. Using a tropical convective-scale data assimilation system, we assimilate 3-hourly radiosonde data from the pilot field campaign of the Years of Maritime Continent, in addition to existing available observations, to diagnose the model biases and assess the relative impacts of the additional wind, temperature, and moisture information on the simulated diurnal cycle of precipitation over the western coast of Sumatra. We show how assimilating such high-frequency in situ observations can improve the simulated diurnal cycle, verified against satellite-derived precipitation, radar-derived precipitation, and rain gauge data. The improvements are due to a better representation of the sea breeze and increased available moisture in the lowest 4 km prior to peak convection. Assimilating wind information alone was sufficient to improve the simulations. We also highlight how during the assimilation, certain multivariate background error constraints and moisture addition in an ad hoc manner can negatively impact the simulations. Other approaches should be explored to better exploit information from such high-frequency observations over this region.

Understanding the role of topography on the diurnal cycle of precipitation in the Maritime Continent during MJO propagation

2022 ◽  
Author(s):  
Haochen Tan ◽  
Pallav Ray ◽  
Bradford Barrett ◽  
Jimy Dudhia ◽  
Mitchell Moncrieff ◽  
...  
Keyword(s):  
Diurnal Cycle ◽  
Maritime Continent ◽  
Diurnal Cycle Of Precipitation

scholarly journals Morning Precipitation Peak over the Strait of Malacca under a Calm Condition

2010 ◽  
Vol 138 (4) ◽  
pp. 1474-1486 ◽  
Author(s):  
Mikiko Fujita ◽  
Fujio Kimura ◽  
Masanori Yoshizaki
Keyword(s):  
Numerical Model ◽  
Observational Data ◽  
Diurnal Cycle ◽  
Early Morning ◽  
Malay Peninsula ◽  
Maritime Continent ◽  
Precipitation System ◽  
Calm Condition ◽  
Diurnal Cycle Of Precipitation ◽  
Strait Of Malacca

Abstract This paper describes the formation mechanism of morning maximum in the diurnal cycle of precipitation, at the Strait of Malacca under a calm condition, with a nonhydrostatic mesoscale numerical model and ship-based observational data. The morning precipitation peak at the strait is induced by the convergence of two cold outflows that have been produced by the precipitation systems in the previous evening over Sumatra and the Malay Peninsula. The outflows converge at the Strait of Malacca around midnight; a new precipitation system is thus generated and reaches its peak in the early morning. Sensitivity experiments using the numerical model suggest that the timing and position of the morning precipitation peak are affected by the width of the strait. In the case of the Strait of Malacca, its width favors the formation of the morning precipitation system around the center of the strait, which explains why its diurnal cycle of precipitation can be observed much clearer than those in other coastal areas over the Maritime Continent.

scholarly journals Contemporary GCM Fidelity in Representing the Diurnal Cycle of Precipitation Over the Maritime Continent

2019 ◽  
Vol 124 (2) ◽  
pp. 747-769 ◽  
Author(s):  
Dariusz B. Baranowski ◽  
Duane E. Waliser ◽  
Xianan Jiang ◽  
James A. Ridout ◽  
Maria K. Flatau
Keyword(s):  
Diurnal Cycle ◽  
Maritime Continent ◽  
Diurnal Cycle Of Precipitation

scholarly journals Assessment of the Diurnal Cycle of Precipitation over the Maritime Continent Simulated by a 20 km Mesh GCM Using TRMM PR Data

2009 ◽  
Vol 87A ◽  
pp. 413-424 ◽  
Author(s):  
Masayuki HARA ◽  
Takao YOSHIKANE ◽  
Hiroshi G. TAKAHASHI ◽  
Fujio KIMURA ◽  
Akira NODA ◽  
...  
Keyword(s):  
Diurnal Cycle ◽  
Maritime Continent ◽  
Trmm Pr ◽  
Diurnal Cycle Of Precipitation

scholarly journals The Impact of MJO, Kelvin, and Equatorial Rossby Waves on the Diurnal Cycle over the Maritime Continent

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 711
Author(s):  
Lakemariam Worku ◽  
Ademe Mekonnen ◽  
Carl Schreck
Keyword(s):  
Diurnal Cycle ◽  
Deep Convection ◽  
Kelvin Waves ◽  
Kelvin Wave ◽  
Maritime Continent ◽  
Diurnal Cycles ◽  
Precipitation Analysis ◽  
The Impact ◽  
Convection Dominated ◽  
Equatorial Rossby Waves

The impacts of the Madden–Julian Oscillation (MJO), Kelvin waves, and Equatorial Rossby (ER) waves on the diurnal cycle of rainfall and types of deep convection over the Maritime Continent are investigated using rainfall from the Tropical Rainfall Measurement Mission Multisatellite Precipitation Analysis and Infrared Weather States (IR–WS) data from the International Satellite Cloud Climatology Project. In an absolute sense, the MJO produced its strongest modulations of rainfall and organized deep convection over the islands, when and where convection is already strongest. The MJO actually has a greater percentage modulation over the coasts and seas, but it does not affect weaker diurnal cycle there. Isolated deep convection was also more prevalent over land during the suppressed phase, while organized deep convection dominated the enhanced phase, consistent with past work. This study uniquely examined the effects of Kelvin and ER waves on rainfall, convection, and their diurnal cycles over the Maritime Continent. The modulation of convection by Kelvin waves closely mirrored that by the MJO, although the Kelvin wave convection continued farther into the decreasing phase. The signals for ER waves were also similar but less distinct. An improved understanding of how these waves interact with convection could lead to improved subseasonal forecast skill.

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