Results 41 to 50 of about 1,728 (177)

How Do Microphysical Processes Influence Large‐Scale Precipitation Variability and Extremes?

Geophysical Research Letters, 2018
Convection permitting simulations using the Model for Prediction Across Scales‐Atmosphere (MPAS‐A) are used to examine how microphysical processes affect large‐scale precipitation variability and extremes.
Samson Hagos, L. Ruby Leung, Chun Zhao, Zhe Feng, Koichi Sakaguchi   +4 more
doaj   +1 more source

QBOi El Niño Southern Oscillation experiments: assessing relationships between ENSO, MJO, and QBO [PDF]

Weather and Climate Dynamics
This study uses an ensemble of climate model experiments coordinated by the Quasi-Biennial Oscillation initiative (QBOi) to analyze the Madden-Julian Oscillation (MJO) in the presence of either perpetual El Niño or La Niña sea surface temperatures during
D. Elsbury, D. Elsbury, F. Serva, J. M. Caron, S.-Y. Back, C. Orbe, J. H. Richter, J. A. Anstey, N. Butchart, C.-C. Chen, J. García-Serrano, J. García-Serrano, A. Glanville, Y. Kawatani, T. Kerzenmacher, F. Lott, H. Naoe, S. Osprey, S. Osprey, F. M. Palmeiro, F. M. Palmeiro, S.-W. Son, M. Taguchi, S. Versick, S. Watanabe, S. Watanabe, K. Yoshida   +26 more
doaj   +1 more source

Performance Evaluation of the MPAS Model in Simulating Southeast Asian Rainfall Characteristics

International Journal of Climatology, EarlyView.
This study evaluates the performance of the Model for Prediction Across Scales–Atmosphere (MPAS) in reproducing key rainfall characteristics over Southeast Asia (SEA) during 2000–2020, using the MSWEP dataset as reference. MPAS realistically captures the observed meridional rainfall gradient, with higher rainfall in the south and lower in the north, as
Nguyen Thanh Hung, Alugula Boyaj, Srivatsan V. Raghavan, Nguyen Ngoc Son, Bhenjamin Jordan Ona   +4 more
wiley   +1 more source

Seasonal Characteristics of Mesoscale Convective Systems Over the Philippines

International Journal of Climatology, EarlyView.
This study examines how mesoscale convective systems (MCSs) over the Philippines are most frequent during boreal summer, while those in winter are longer‐lived and more intense due to cold surges and enhanced easterly moisture transport. Intraseasonal oscillations, such as the Madden‐Julian Oscillation (MJO) and the Boreal Summer Intraseasonal ...
Cathrene Lagare, Junshi Ito, Takeshi Yamazaki, Giuseppe Torri   +3 more
wiley   +1 more source

Dynamics and model representation of two contrasting extreme precipitation events in the Sahel

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Hovmöller diagrams of the two investigated extreme precipitation events in Mali are shown for (i) IMERG observations, and ICOsahedral Nonhydrostatic model (ICON) runs with parameterization of explicit convection (ii) enabled and (iii) disabled. This work highlights that the commonly perceived benefit of using explicit convection in a state‐of‐the‐art ...
Souleymane Sanogo, Marlon Maranan, Andreas H. Fink, Beth J. Woodhams, Peter Knippertz   +4 more
wiley   +1 more source

Windows of opportunity in subseasonal weather regime forecasting: A statistical–dynamical approach

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study explores how the atmospheric state at initialisation creates windows of opportunity for improving week 3 forecasts of weather regime activity. Greenland blocking activity increases following Madden–Julian Oscillation phases 7, 8, and 1 and weak stratospheric polar vortex states, revealing patterns exploitable by statistical models.
Fabian Mockert, Christian M. Grams, Sebastian Lerch, Julian Quinting   +3 more
wiley   +1 more source

Impact of MJO Propagation Speed on Active Atlantic Tropical Cyclone Activity Periods

Geophysical Research Letters
The Madden‐Julian Oscillation (MJO) is often used for subseasonal forecasting of tropical cyclone (TC) activity. However, TC activity still has considerable variability even given the state of the MJO.
Kurt A. Hansen, Matthew A. Janiga, Sharanya J. Majumdar, Benjamin P. Kirtman   +3 more
doaj   +1 more source

The Uncharacteristic Occurrence of the June 2013 Biomass-Burning Haze Event in Southeast Asia: Effects of the Madden-Julian Oscillation and Tropical Cyclone Activity

Atmosphere, 2020
One of the worst haze events to ever hit Peninsular Malaysia occurred in June 2013 due to smoke from Riau, Central Sumatra. While biomass-burning in the region is common, the early occurrence of a haze episode of this magnitude was uncharacteristic of ...
Yaasiin Oozeer, Andy Chan, Jun Wang, Jeffrey S. Reid, Santo V. Salinas, Maggie C. G. Ooi, Kenobi I. Morris   +6 more
doaj   +1 more source

Assessing the impact of model biases on subseasonal forecast skill

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Relaxation experiments where the nudging was performed towards bias‐corrected integrations of the same model display significantly improved skill at weeks 3 and 4, particularly in the northern extratropics. This indicates that there is a large potential for improving dynamical subseasonal forecasting skill by improved treatment of model biases.
Frédéric Vitart, Magdalena Balmaseda
wiley   +1 more source

The Link Between the Madden‐Julian Oscillation and Rainfall Trends in Northwest Australia

Geophysical Research Letters, 2023
Rainfall during the monsoon in northwest Australia has increased since the 1950s. Previous studies have explored possible causes of the rainfall increase; however, the trend has not been fully explained. Understanding the cause of this trend is important
Alexander Borowiak, Andrew King, Todd Lane   +2 more
doaj   +1 more source