A Damping Effect of the Maritime Continent for the Madden‐Julian Oscillation

Jiang, Xianan; Su, Hui; Waliser, Duane E.

doi:10.1029/2019jd031503

Cited by 17 publications

(19 citation statements)

References 90 publications

(143 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While this study highlights the role of the basic state moisture in the simulation of the MJO, our understanding of the processes that control the mean state moisture around the MC is still limited. Jiang et al (2019) suggested that the MC diurnal cycle and topography play an important role on the formation of the mean state moisture around the MC. The improvement in the mean state moisture around MC in CMIP6 models is possibly due to the increased horizontal resolution, thus a better representation of MC island effects.…”

Section: Summary and Discussionmentioning

confidence: 99%

MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?

Ahn

Kim

Kang

et al. 2020

Geophysical Research Letters

Self Cite

100

View full text Add to dashboard Cite

Many climate models struggle with a poor simulation of the Madden‐Julian Oscillation (MJO), especially its propagation across the Maritime Continent (MC). This study quantitatively evaluates the robustness of MJO propagation over the MC in climate models that participated in Coupled Model Intercomparison Project Phase 5 (CMIP5) and Phase 6 (CMIP6) with a newly developed MC propagation metric. The results show that the CMIP6 models simulate MJO propagation over the MC more realistically than the CMIP5 models. Lower free‐tropospheric moisture budget analysis highlights that the greater horizontal moisture advection is responsible for the enhanced MJO propagation over the MC. The increase in horizontal moisture advection in the CMIP6 models is mainly attributed to the steeper horizontal mean state moisture gradient around the MC, which is associated with the reduction of the equatorial dry bias.

show abstract

Section: Summary and Discussionmentioning

confidence: 99%

MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?

Ahn

Kim

Kang

et al. 2020

Geophysical Research Letters

Self Cite

100

View full text Add to dashboard Cite

show abstract

“…Also, in the model experiments with disabled diurnal cycles or modified MC topography, the simulated changes to MJO propagation behavior are due to not only the diurnal cycle and MC topography but also associated changes in the large‐scale mean state. For example, as previously discussed, the strong topographically phase‐locked mean moisture pattern over the MC, which strongly interrupts MJO moist preconditioning over the eastern part of the MC mountains, is largely defined by the diurnal cycle (Jiang et al, 2019). If the diurnal cycle is disabled in a model, the regional mean moisture gradient will be significantly weakened, which favors a smooth eastward MJO propagation over the MC (Hagos et al, 2016; Oh et al, 2013).…”

Section: Recent Progress In Understanding Modeling and Predicting Tmentioning

confidence: 96%

“…Hung & Sui, 2018; Jiang et al, 2019). Strongly shaped by the local diurnal cycle, the low‐level winter mean moisture pattern over the MC is characterized by moisture maxima over local mountain peaks (Jiang et al, 2019). Given this mean moisture distribution, the moisture advection by anomalous easterly MJO winds corresponding to the active MJO convection over the eastern Indian Ocean will lead to a drying (moistening) effect to the east (west) of the mountain peaks, which disrupts the organization of large‐scale MJO convection over the MC area.…”

Section: Recent Progress In Understanding Modeling and Predicting Tmentioning

confidence: 99%

“…Meanwhile, by using high‐resolution reanalysis data, it is shown that the interruption of lower tropospheric moistening over the MC islands ahead of the MJO convection is closely associated with the topographically phase‐locked mean moisture pattern over the MC (C.‐S. Hung & Sui, 2018; Jiang et al, 2019). Strongly shaped by the local diurnal cycle, the low‐level winter mean moisture pattern over the MC is characterized by moisture maxima over local mountain peaks (Jiang et al, 2019).…”

Section: Recent Progress In Understanding Modeling and Predicting Tmentioning

confidence: 99%

See 1 more Smart Citation

Fifty Years of Research on the Madden‐Julian Oscillation: Recent Progress, Challenges, and Perspectives

et al. 2020

Self Cite

View full text Add to dashboard Cite

Since its discovery in the early 1970s, the crucial role of the Madden‐Julian Oscillation (MJO) in the global hydrological cycle and its tremendous influence on high‐impact climate and weather extremes have been well recognized. The MJO also serves as a primary source of predictability for global Earth system variability on subseasonal time scales. The MJO remains poorly represented in our state‐of‐the‐art climate and weather forecasting models, however. Moreover, despite the advances made in recent decades, theories for the MJO still disagree at a fundamental level. The problems of understanding and modeling the MJO have attracted significant interest from the research community. As a part of the AGU's Centennial collection, this article provides a review of recent progress, particularly over the last decade, in observational, modeling, and theoretical study of the MJO. A brief outlook for near‐future MJO research directions is also provided.

show abstract

“…They further suggested that ENSO influences the transient dry precursors by modifying the background moisture. Using ERA5 reanalysis, Jiang et al (2019) showed that MC topography interrupts the moistening that supports eastward propagation of the MJO by modifying the seasonal mean zonal distribution of moisture and the associated advection moistening. In another recent study, Hagos et al (2019) estimated the moisture flux convergence directly from precipitation and showed the slow eastward migration of zonal moisture flux convergence between the Asian and Australian monsoon convergence centers from summer to winter.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent

et al. 2020

View full text Add to dashboard Cite

This study investigates the seasonality of the interaction of the Madden‐Julian Oscillation (MJO) with the Maritime Continent (MC). Beside their seasonal east‐west migration with the monsoons, observations show that the MJO amplitude and precipitation over the MC islands exhibit semiannual variability, with apparent strengthening of MJO signal during March and September, when solar insolation is strongest over the MC region. Furthermore, during the high‐insolation months, soil moisture shows wetter conditions during the early phases of the MJO. Motivated by these results, a series of regional convection permitting simulations are performed for the November 2014 MJO event as a case study under the following conditions: (i) increased solar insolation to mimic the local summer, (ii) reduced initial soil moisture, and (iii) the two conditions combined to isolate their local effects from their impacts on the large‐scale circulation. Results show that increased insolation increases precipitation including that associated with MJO moisture convergence over the MC region. On the other hand, decreased initial soil moisture slightly increases precipitation over the MC islands and reduces it over the surrounding waters, but such effect is short lived as the increased precipitation gradually restores the soil moisture to wetter conditions. Using a moisture budget analysis that isolates the MJO and non‐MJO signals and additional idealized simulations, the MJO response to high insolation is demonstrated to be related to an increase in the basic state moisture over the MC region rather than a direct response of the MJO to the insolation.

show abstract

A Damping Effect of the Maritime Continent for the Madden‐Julian Oscillation

Cited by 17 publications

References 90 publications

MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?

MJO Propagation Across the Maritime Continent: Are CMIP6 Models Better Than CMIP5 Models?

Fifty Years of Research on the Madden‐Julian Oscillation: Recent Progress, Challenges, and Perspectives

Impacts of Insolation and Soil Moisture on the Seasonality of Interactions Between the Madden‐Julian Oscillation and Maritime Continent

Contact Info

Product

Resources

About