研究者詳細 - 増永　浩彦

論文 - 増永　浩彦

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The Tropical Convective Evolution in Different Rain Types over the West and East Pacific 査読有り

Chen, YC; Masunaga, H

SOLA 20 巻頁： 392 - 399 2024年12月

When, Where and to What Extent Do Temperature Perturbations Near Tropical Deep Convection Follow Convective Quasi Equilibrium? 査読有り国際共著

Li, YX; Masunaga, H; Takahashi, H; Yu, JY

GEOPHYSICAL RESEARCH LETTERS 51 巻 ( 11 ) 2024年6月

Long-term relationships between summer clouds and aerosols over mid-high latitudes of the Northern Hemisphere 査読有り

Watari, A; Iizuka, Y; Fujita, K; Masunaga, H; Kawamoto, K

SCIENTIFIC REPORTS 14 巻 ( 1 ) 2024年4月

The Energetics of the Lagrangian Evolution of Tropical Convective Systems 査読有り国際共著国際誌

Masunaga, H; Takahashib, H

JOURNAL OF THE ATMOSPHERIC SCIENCES 81 巻 ( 4 ) 頁： 783 - 799 2024年4月

Investigating Convective Processes Underlying ENSO: New Insights Into the Fixed Anvil Temperature Hypothesis 査読有り国際共著国際誌

Takahashi, H; Luo, ZJ; Masunaga, H; Storer, R; Noda, AT

GEOPHYSICAL RESEARCH LETTERS 51 巻 ( 6 ) 2024年3月

The Edge Intensification of Eastern Pacific ITCZ Convection 査読有り

Masunaga Hirohiko

JOURNAL OF CLIMATE 36 巻 ( 11 ) 頁： 3469 - 3480 2023年6月

Process-Level Assessment of the Iris Effect Over Tropical Oceans 査読有り

Ito Masato, Masunaga Hirohiko

GEOPHYSICAL RESEARCH LETTERS 49 巻 ( 7 ) 2022年4月

Characterizing Ice-Scattering Homogeneity in TRMM Microwave Imagers and Its Influence on Oceanic Rain-Rate Estimation Bias of TRMM Precipitation Radar 査読有り国際共著国際誌

Sekaranom Andung Bayu, Nurjani Emilya, Wibowo Sandy Budi, Masunaga Hirohiko

ATMOSPHERE 12 巻 ( 11 ) 2021年11月

Refinement of Surface Precipitation Estimates for the Dual-frequency Precipitation Radar on the GPM Core Observatory Using Near-Nadir Measurements 査読有り国際誌

Hirose Masafumi, Shige Shoichi, Kubota Takuji, Furuzawa Fumie A., Minda Haruya, Masunaga Hirohiko

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 99 巻 ( 5 ) 頁： 1231 - 1252 2021年10月

Transient Aggregation of Convection: Observed Behavior and Underlying Processes 査読有り国際共著

Masunaga Hirohiko, Holloway Christopher E., Kanamori Hironari, Bony Sandrine, Stein Thorwald H. M.

JOURNAL OF CLIMATE 34 巻 ( 5 ) 頁： 1685 - 1700 2021年3月

Detection and Tracking of Tropical Convective Storms Based on Globally Gridded Precipitation Measurements: Algorithm and Survey over the Tropics 査読有り国際共著

Takahashi Hanii, Lebsock Matthew, Luo Zhengzhao Johnny, Masunaga Hirohiko, Wang Cindy

JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY 60 巻 ( 3 ) 頁： 403 - 421 2021年3月

A Satellite-Based Estimate of Convective Vertical Velocity and Convective Mass Flux: Global Survey and Comparison With Radar Wind Profiler Observations 査読有り国際共著

Jeyaratnam Jeyavinoth, Luo Zhengzhao Johnny, Giangrande Scott E., Wang Die, Masunaga Hirohiko

GEOPHYSICAL RESEARCH LETTERS 48 巻 ( 1 ) 2021年1月

Refinement of surface precipitation estimates for the Dual-frequency Precipitation Radar on the GPM Core Observatory using near-nadir measurments 査読有り

Hirose, M., S. Shige, T. Kubota, F. A. Furuzawa, H. Minda, and H. Masunaga

Journal of the Meteorological Society of Japan 99 巻頁： 1231 - 1252 2021年

A Mechanism for the Maintenance of Sharp Tropical Margins 査読有り国際共著

Masunaga Hirohiko, Mapes Brian E.

JOURNAL OF THE ATMOSPHERIC SCIENCES 77 巻 ( 4 ) 頁： 1181 - 1197 2020年4月

Inter-product biases in global precipitation extremes 査読有り国際共著

Masunaga, H., M. Schröder, F. A. Furuzawa, C. Kummerow, E. Rustemeier, and U. Schneider

Environmental Research Letters 14 巻頁： 125016 2019年12月

Vertical Modes and Effective Stability of Quasi-2-Day Waves 査読有り

Sumi Yukari, Masunaga Hirohiko

JOURNAL OF THE ATMOSPHERIC SCIENCES 76 巻 ( 7 ) 頁： 2005 - 2022 2019年7月

Origins of Heavy Precipitation Biases in the TRMM PR and TMI Products Assessed with CloudSat and Reanalysis Data 査読有り国際共著

Sekaranom Andung Bayu, Masunaga Hirohiko

JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY 58 巻 ( 1 ) 頁： 37-54 2019年1月

Radiative Invigoration of Tropical Convection by Preceding Cirrus Clouds 査読有り国際共著

Masunaga Hirohiko, Bony Sandrine

JOURNAL OF THE ATMOSPHERIC SCIENCES 75 巻 ( 4 ) 頁： 1327-1342 2018年4月

The Meandering Margin of the Meteorological Moist Tropics 査読有り国際共著

Mapes Brian E., Chung Eui Seok, Hannah Walter M., Masunaga Hirohiko, Wimmers Anthony J., Velden Christopher S.

GEOPHYSICAL RESEARCH LETTERS 45 巻 ( 2 ) 頁： 1177-1184 2018年1月

New Observational Metrics of Convective Self-Aggregation: Methodology and a Case Study 査読有り

Kadoya Toshiki, Masunaga Hirohiko

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 96 巻 ( 6 ) 頁： 535-548 2018年

Global precipitation measurements for validating climate models 査読有り国際共著

Tapiador F. J., Navarro A., Levizzani V., Garcia-Ortega E., Huffman G. J., Kidd C., Kucera P. A., Kummerow C. D., Masunaga H., Petersen W. A., Roca R., Sanchez J. -L., Tao W. -K., Turk F. J.

ATMOSPHERIC RESEARCH 197 巻頁： 1 - 20 2017年11月

Implications of Warm Rain in Shallow Cumulus and Congestus Clouds for Large-Scale Circulations 査読有り国際共著

Nuijens Louise, Emanuel Kerry, Masunaga Hirohiko, L'Ecuyer Tristan

SURVEYS IN GEOPHYSICS 38 巻 ( 6 ) 頁： 1257-1282 2017年11月

Observing Convective Aggregation 査読有り国際共著

Holloway Christopher E., Wing Allison A., Bony Sandrine, Muller Caroline, Masunaga Hirohiko, L'Ecuyer Tristan S., Turner David D., Zuidema Paquita

SURVEYS IN GEOPHYSICS 38 巻 ( 6 ) 頁： 1199-1236 2017年11月

Comparison of TRMM-Derived Rainfall Products for General and Extreme Rains over the Maritime Continent 査読有り

Sekaranom Andung Bayu, Masunaga Hirohiko

JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY 56 巻 ( 7 ) 頁： 1867-1881 2017年7月

Revisiting the iris effect of tropical cirrus clouds with TRMM and A-Train satellite data 査読有り国際共著

Choi Yong-Sang, Kim WonMoo, Yeh Sang-Wook, Masunaga Hirohiko, Kwon Min-Jae, Jo Hyun-Su, Huang Lei

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122 巻 ( 11 ) 頁： 5917-5931 2017年6月

A toy model of tropical convection with a moisture storage closure 査読有り

Masunaga Hirohiko, Sumi Yukari

JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS 9 巻 ( 1 ) 頁： 647-667 2017年3月

Relationship between the direction of diurnal rainfall migration and the ambient wind over the Southern Sumatra Island 査読有り

Yanase A., Yasunaga K., Masunaga H.

EARTH AND SPACE SCIENCE 4 巻 ( 3 ) 頁： 117-127 2017年3月

Convective and large-scale mass flux profiles over tropical oceans determined from synergistic analysis of a suite of satellite observations 査読有り

Masunaga, H., and Z. J. Luo

J. Geophys. Res. Atmos 121 巻 2016年

A Moist Static Energy Budget Analysis of Quasi 2-day Wave Using Satelite and Reanalsyis Data 査読有り

Sumi, Y. and H. Masunaga

J. Atmos. Sci. 73 巻頁： 743-759 2016年

Assessment of a Satellite-based Atmospheric Budget Analysis Method with CINDY2011/DYNAMO/AMIE and TOGA COARE Sounding Array Data 査読有り

Masunaga, H.

J. Meteor. Soc. Japan 93A 巻頁： 21-40 2015年

Early evaluation of Ku- and Ka-band sensitivities for the Global Precipitation Measurement (GPM) Dual-frequency Precipitation Radar (DPR) 査読有り

Toyoshima, K., H. Masunaga, and F. A. Furuzawa

SOLA 11 巻頁： 14-17 2015年

Assessment of the consistency among global microwave land surface emissivity products 査読有り

Norouzi,H., M. Temimi, C. Prigent, J. Turk, R. Khanbilvardi, Y. Tian, F. A. Furuzawa, and H. Masunaga

Atmos. Meas. Tech. 8 巻頁： 1197-1205 2015年

Free-tropospheric moisture convergence and tropical convective regimes 査読有り

Masunaga, H.

Geophys. Res. Lett. 41 巻頁： 8611-8618 2014年12月

A mechanism of tropical convection inferred from observed variability in the moist static energy budget 査読有り

Masunaga, H., and Tristan S. L'Ecuyer

J. Atmos. Sci. 71 巻頁： 3747-3766 2014年

The potential roles of background surface wind in the SST variability associated with intraseasonal oscillations 査読有り

Kanemaru, K. and H. Masunaga

J. Climate 27 巻頁： 7053-7068 2014年

Quantifying uncertainties in land surface microwave emissivity retrievals 査読有り

Tian, Y., C. Peters-Lidard , K. W. Harrison, C. Prigent, H. Norouzi, F. Aires, S.-A. Boukabara, F. A. Furuzawa, and H. Masunaga Tian, Y., C. Peters-Lidard , K. W. Harrison, C. Prigent, H. Norouzi, F. Aires, S.-A. Boukabara, F. A. Furuzawa, and H. Masunaga

IEEE Trans. Geosci. Remote Sens. 52 巻頁： 829-840 2014年

A satellite study of tropical moist convection and environmental variability: A moisture and thermal budget analysis 査読有り

Masunaga, H.

J. Atmos. Sci. 70 巻頁： 2443-2466 2013年

A satellite study of the relationship between sea surface temperature and column water vapor over tropical and subtropical oceans 査読有り

Kanemaru, K. and H. Masunaga

J. Climate 26 巻頁： 4204-4218 2013年

An evaluation of microwave land surface emissivities over the continental United States to benefit GPM-era precipitation algorithms 査読有り

Ferraro, R., C. Peters-Lidard , C. Hernandez, F. J. Turk, F. Aires, C. Prigent, X. Lin, S.-A. Boukabara, F. Furuzawa, K. Gopalan, K. Harrison, F. Karbou, L. Li, C. Li, H. Masunaga, L. Moy, S. Ringerud, G. Skofronik-Jackson, Y. Tian, and N.-Y. Wang

IEEE Trans. Geosci. Remote Sens. 51 巻頁： 378-398 2013年

Aerosol effects on cumulus congestus population over the tropical Pacific: A cloud-resolving modeling study 査読有り

Li, X., W.-K. Tao, H. Masunaga, G. Gu, and X. Zeng

J. Meteor. Soc. Japan 91 巻頁： 817-833 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

This study examines the significance of aerosol serving as cloud condensation nuclei (CCN) in modulating strengths
of tropical maritime convection. Through a Tropical Ocean Global Atmosphere Couple Ocean̶Atmosphere Response
Experiment (TOGA COARE) case study using a cloud-resolving model (the Goddard Cumulus Ensemble Model with
a horizontal mesh interval of 750 m) anda detailedspectral bin microphysical scheme, it is foundthat low aerosol
concentration acts to reduce convection strengths. Over the tropical western Pacific where low-level water vapor is
abundant and a ubiquitous weak stable level exists near 0°C, the low backgroundmaritime aerosol concentration is
conducive for forming cumulus congestus. Sensitivity tests show that the main mechanism of convection damping in a
clean maritime environment is through reduced condensational growth, although the freezing of supercooled water,
cloudtop evaporation, andrain evaporation also contribute to the simulatedeffects. Considering the importance of
congestus in tropical dynamics and the Madden̶Julian oscillation (MJO) lifecycle, we further propose a hypothesis
that aerosol̶cloud̶precipitation interactions in an ultraclean marine environment may serve as a damping mechanism
for tropical convection.

Analysis of cloud properties associated with tropical convection in climate models and satellite data 査読有り

気象集誌 90 巻頁： 629-646 2012年

Short-term versus climatological relationship between precipitation and tropospheric humidity 査読有り

25 巻頁： 7983-7990 2012年

Reproducibility by climate models of cloud radiative forcing associated with tropical convection 査読有り

25 巻頁： 1247-1262 2012年

A satellite study of the atmospheric forcing and response to moist convection over tropical and subtropical oceans 査読有り

69 巻頁： 150-167 2012年

Equatorial asymmetry of the east Pacific ITCZ: Observational constraints on the underlying processes 査読有り

Masunaga, H. and T. S. L'Ecuyer

J. Climate 24 巻頁： 1784-1800 2011年3月

Satellite Data Simulator Unit (SDSU): A multi-sensor, multi-spectral satellite simulator package 査読有り

Masunaga, H., T. Matsui, W.-K. Tao, A. Y. Hou, C. D. Kummerow, T. Nakajima, P. Bauer, W. S. Olson, M. Sekiguchi, and T. Y. Nakajima

Bull. Amer. Meteorol. Soc. 91 巻頁： 1625-1632 2010年12月

The southeast Pacific warm band and double ITCZ 査読有り

Masunaga, H. and T. S. L'Ecuyer

J. Climate 23 巻頁： 1189-1208 2010年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The east Pacific double intertropical convergence zone (ITCZ) in austral fall is investigated with particular
focus on the growing processes of its Southern Hemisphere branch. Satellite measurements from the Tropical
Rainfall Measuring Mission (TRMM) and Quick Scatterometer (QuikSCAT) are analyzed to derive 8-yr
climatology from 2000 to 2007. The earliest sign of the south ITCZ emerges in sea surface temperature (SST)
by January, followed by the gradual development of surface convergence and water vapor. The shallow
cumulus population starts growing to form the south ITCZ in February, a month earlier than vigorous deep
convection is organized into the south ITCZ. The key factors that give rise to the initial SST enhancement or
the southeast Pacific warm band are diagnosed by simple experiments. The experiments are designed to
calculate SST, making use of an ocean mixed layer ‘‘model’’ forced by surface heat fluxes, all of which are
derived from satellite observations. It is found that the shortwave flux absorbed into the ocean mixed layer is
the primary driver of the southeast Pacific warm band. The warm band does not develop in boreal fall because
the shortwave flux is seasonally so small that it is overwhelmed by other negative fluxes, including the latent
heat and longwave fluxes. Clouds offset the net radiative flux by 10–15 W m22, which is large enough for the
warm band to develop in boreal fall if it were not for clouds reflecting shortwave radiation. Interannual
variability of the double ITCZ is also discussed in brief.

Improving a spectral bin microphysical scheme using TRMM satellite observations 査読有り

Li, X., W.-K. Tao, T. Matsui, C. Liu, and H. Masunaga

Quart. J. Roy. Meteor. Soc. 136 巻頁： 382-399 2010年

記述言語：英語掲載種別：研究論文（学術雑誌）

TRMM-observed mature-stage squall lines during late spring and early summer
in the central USA over a 9-year period are compiled and compared with a case
simulation by the Goddard Cumulus Ensemble (GCE) model with a spectral bin
microphysical scheme. During the quasi-steady state of the simulation, a forward
radiative transfer model calculates TRMM Precipitation Radar (PR) reflectivity
and 85 GHz brightness temperatures from simulated particle size distributions.
Comparisons between model and TRMM observations using radar Contoured
Frequency with Altitude Diagrams (CFADs) and 85 GHz brightness temperature
probability density distributions are performed, in addition to CFADs from a surface
C-band radar for the same case. Radar CFADs comparisons reveal that the model
overestimates sizes of snow/aggregates in the stratiform region.
Three sets of sensitivity tests are carried out in order to improve the simulated
radar reflectivity profiles: increase of aggregates’ density and terminal fall velocity;
changing temperature dependency of collection efficiency between ice-phase
particles, particularly those of the plate-type; and adding a break-up scheme for
large aggregates. While all three approaches mitigate the discrepancies, changing
collection efficiency produces the best match in magnitudes and characteristics
of radar CFADs. In addition, interactions between ice- and water-phase particles
also need to be adjusted in order to have good comparisons in both radar CFADs
and 85 GHz brightness temperature distributions. This study shows that long-term
satellite observations, especially those with multiple sensors, can be very useful in
constraining model microphysics.

A 9-season TRMM observation of the Austral Summer MJO and Low-frequency Equatorial Waves 査読有り

Masunaga, H.

気象集誌 87A 巻頁： 295-315 2009年

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

A long-term observation from the Tropical Rainfall Measuring Mission (TRMM) is analyzed to investigate the Madden-Julian Oscillation (MJO), Kelvin wave, and equatorial Rossby (ER) wave in austral summer seasons. TRMM Precipitation Radar (PR) and Visible/Infrared Scanner (VIRS) measurements are jointly used to clarify convective progression associated with individual modes of the tropical oscillations. Variability in the dynamic and thermodynamic environment involving sea surface temperature (SST), column relative humidity (CRH), and moisture convergence is also examined. A sea surface warming is found to precede the peak MJO convection by ∼ 10 days, while a prior SST increase is not as evident for the Kelvin and ER waves. Moisture convergence and CRH exhibit a horseshoe-like pattern in the composite MJO map, constituted of a pair of off-equatorial maxima and a weak equatorial peak. The Kelvin wave has a moist anomaly on the equator leading the convective peak as theoretically expected, while the moist anomaly also extends poleward without being accompanied by moisture convergence. Moisture convergence leads CRH by a day or two for the Kelvin and ER waves. Moisture convergence is, in contrast, virtually concurrent with CRH for the MJO. The correlation between CRH and deep stratiform coverage is diverse among the three modes of the tropical oscillations. Shallow cumulus and cumulus congestus lead the MJO convective peak by ∼ 1 day, followed by lingering non-precipitating high clouds. ER wave convection is led by moisture convergence but lagged by CRH. The convective progression appears not to proceed in a monotonic way for the ER wave.
A possible mechanism to explain MJO propagation is discussed as suggested by a synthesis of the present findings. The Kelvin wave guides the eastward migration of MJO convection onset over the Indian Ocean. The role of the Kelvin wave in MJO propagation diminishes as the MJO enters the west Pacific with the convective are

An MJO simulated by the NICAM at 14-km and 7-km resolutions 査読有り

Liu, P., M. Satoh, B. Wang, H. Fudeyasu, T. Nasuno, T. Li, H. Miura, H. Taniguchi, H. Masunaga, X. Fu, and H. Annamalai

Mon. Wea. Rev. 137 巻頁： 3254-3268 2009年

記述言語：英語掲載種別：研究論文（学術雑誌）

This study discloses detailed Madden–Julian oscillation (MJO) characteristics in the two 30-day integrations
of the global cloud-system-resolving Nonhydrostatic Icosahedral Atmospheric Model (NICAM) using the allseason
real-time multivariateMJO index ofWheeler and Hendon. The model anomaly is derived by excluding
the observed climatology because the simulation is sufficiently realistic.Results showthat theMJOhas a realistic
evolution in amplitude pattern, geographical locations, eastward propagation, and baroclinic- and westwardtilted
structures. In the central IndianOcean, convection develops with the low-level easterlywind anomaly then
matures where the low-level easterly and westerly anomalies meet. Anomalous moisture tilts slightly with
height. In contrast, over the western Pacific, the convection grows with a low-level westerly anomaly.Moisture
fluctuations, leading convection in eastward propagation, tilt clearly westward with height. The frictional
moisture convergence mechanism operates to maintain the MJO. Such success can be attributed to the explicit
representation of the interactions between convection and large-scale circulations. The simulated event, however,
grows faster in phases 2 and 3, and peaks with 30%higher amplitude than that observed, although the 7-km
version shows slight improvement. The fast-growth phases are induced by the fast-growing low-level convergence
in the IndianOcean and the strongly biased ITCZ in the west Pacific when themodel undergoes a spinup.
The simulated OLR has a substantial bias in the tropics. Possible solutions to the deficiencies are discussed.
1. Introduction
The Madden–Julian oscillation (MJO; Madden and
Julian 1971, 1972, 1994) dominates tropospheric variability
in the tropics on time scales of 30–60 days. The
oscillation influences weather and climate variability
substantially in both the tropics (e.g., Yasunari 1979;
Hendon and Liebmann 1990; Lawrence and Webster
2002) and

Evaluation of Precipitation and High-level Cloud Areas Associated with Large-scale Circulation over the Tropical Pacific in the CMIP3 Models 査読有り

Ichikawa, H., H. Masunaga, and H. Kanzawa

気象集誌 87 巻頁： 771-789 2009年

記述言語：英語掲載種別：研究論文（学術雑誌）

Precipitation and high-level cloud (HLC) areas in association with the large-scale circulation over the tropical
Pacific are analyzed for simulations of nineteen Coupled Model Intercomparison Project Phase 3 (CMIP3) models
with observations for 16 years of 1984–1999. The distribution of rainfall and HLC areas are composited around
the geographical center of tropospheric upper-level (200 hPa) divergence (DIV) along Intertropical Convergence
Zone (ITCZ) using monthly anomaly data. Datasets with a finer temporal sampling than monthly means were
not available for the present purposes. The most notable feature is that the horizontal spread of enhanced circulation
and the related rainfall and HLC areas are all underestimated around the DIV center in the models compared
to the observation. Particularly, the underestimation is pronounced in HLC, presumably owing to di‰culties
in the physical processes relevant to the spatial distribution of HLC area. In general, a model with a higher
correlation between the large-scale circulation field and rainfall tends to have a wider spread of HLC area around
the DIV center.

A Joint Satellite and Global Cloud-Resolving Model Analysis of a Madden-Jullian Oscillation Event: Model Diagnosis 査読有り

Masunaga, H., M. Satoh, and H. Miura

J. Geophys. Res. 113 巻 ( D17210 ) 頁： doi:10.1029/2008JD009986 2008年9月

*Seasonality and Regionality of the Madden-Julian Oscillation, Kelvin Wave, and Equatorial Rossby Wave. 査読有り

Masunaga, H.

J. Atmos. Sci. 64 巻頁： 4400-4416 2007年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The Madden–Julian oscillation (MJO), Kelvin wave, and equatorial Rossby (ER) wave—collectively
called intraseasonal oscillations (ISOs)—are investigated using a 25-yr record of outgoing longwave radiation
(OLR) measurements as well as the associated dynamical fields. The ISO modes are detected by
applying bandpass filters to the OLR data in the frequency–wavenumber space. An automated wavetracking
algorithm is applied to each ISO mode so that convection centers accompanied with the ISOs are
traced in space and time in an objective fashion. The identified paths of the individual ISO modes are first
examined and found strongly modulated regionally and seasonally. The dynamical structure is composited
with respect to the convection centers of each ISO mode. A baroclinic mode of the combined Rossby and
Kelvin structure is prominent for the MJO, consistent with existing work. The Kelvin wave exhibits a
low-level wind field resembling the shallow-water solution, while a slight lead of low-level convergence over
convection suggests the impact of frictional boundary layer convergence on Kelvin wave dynamics. A lagged
composite analysis reveals that the MJO is accompanied with a Kelvin wave approaching from the west
preceding the MJO convective maximum in austral summer. MJO activity then peaks as the Kelvin and ER
waves constructively interfere to enhance off-equatorial boundary layer convergence. The MJO leaves a
Kelvin wave emanating to the east once the peak phase is passed. The approaching Kelvin wave prior to the
development of MJO convection is absent in boreal summer and fall. The composite ER wave, loosely
concentrated around the MJO, is nearly stationary throughout. A possible scenario to physically translate
the observed result is also discussed.

*The Madden-Julian Oscillation Recorded in Early Observations from the Tropical Rainfall Measuring Mission (TRMM). 査読有り

Masunaga, H., T. S. L'Ecuyer, and C. D. Kummerow

J. Atmos. Sci. 63 巻頁： 2777-2794 2006年11月

Observations of Tropical Precipitating Clouds Ranging from Shallow to Deep Convective Systems. 査読有り

Masunaga, H., and C. D. Kummerow

Geophys. Res. Lett. 33 巻 ( L16805 ) 頁： doi:10.1029/2006GL026547 2006年8月

Variability in the Characteristics of Precipitation Systems in the Tropical Pacific.Part II: Implications for Atmospheric Heating 査読有り

TRISTAN S. L’ECUYER, HIROHIKO MASUNAGA, AND CHRISTIAN D. KUMMEROW

J. Climate 19 巻頁： 1388-1406 2006年

Satellite-based Assessment of Marine Low Cloud Variability Associated with Aerosol, Atmospheric Stability, and the Diurnal Cycles. 査読有り

Matsui, T., H. Masunaga, R. A. Pielke Sr., S. M. Kreidenweis, W.-K. Tao, M. Chin, and Y. J. Kaufman

J. Geophys. Res. 111 巻 ( D17204 ) 頁： doi:10.1029/2005JD006097 2006年

*Combined Radar and Radiometer Analysis of Precipitation Profiles for a Parametric Retrieval Algorithm. 査読有り

Masunaga, H. and C. D. Kummerow

J. Atmos. Oceanic Tech. 22 巻頁： 909-929 2005年

*Variability in the Characteristics of Precipitation Systems in the Tropical Pacific. Part I. Spatial Structure. 査読有り

Masunaga, H., T. S. L'Ecuyer, and C. D. Kummerow

J. Climate 18 巻頁： 823-840 2005年

Impact of aerosols and atmospheric thermodynamics on cloudproperties within the climate system 査読有り

Toshihisa Matsui, Hirohiko Masunaga, and Roger A. Pielke Sr.

Geophys. Res. Lett. 31 巻 ( L06109 ) 頁： doi:10.1029/2003GL019287 2004年

Physical Properties of Maritime Low Clouds as Retrieved by Combined Use of TRMM Microwave Imager and Visible/Infrared Scanner. II. Climatology of Warm Clouds and Rain. 査読有り

Masunaga, H., T. Y. Nakajima, T. Nakajima, M. Kachi, and K. Suzuki

J. Geophys. Res 107 巻 ( D19 ) 頁： doi:10.1029/2001JD001269 2002年

Physical Properties of Maritime Low Clouds as Retrieved by Combined Use of TRMM Microwave Imager and Visible/Infrared Scanner. Algorithm. 査読有り

Masunaga, H., T. Y. Nakajima, T. Nakajima, M. Kachi, R. Oki, and S. KurodaMasunaga, H., T. Y. Nakajima, T. Nakajima, M. Kachi, R. Oki, and S. Kuroda

J. Geophys. Res. 107 巻 ( D10 ) 頁： doi:10.1029/2001JD000743 2002年

Comparison of Rainfall Products Derived from TRMM Microwave Imager and Precipitation Radar. 査読有り

Masunaga, H., T. Iguchi, R. Oki, and M. Kachi

J. Applied Meteor. 41 巻頁： 849-862 2002年

The Effective Cloud Fraction of Broken Clouds Obtained by Multi-stream Radiative Transfer. I. Longwave Radiation 査読有り

Masunaga, H. and T. Nakajima

J. Atmos. Sci. 58 巻頁： 2455-2467 2001年

Infall Signatures in Molecular Line Spectra of Protostellar Envelopes. 査読有り

Masunaga, H. and Inutsuka, S.

Astrophys. J. 536 巻頁： 406-415 2000年

A Radiation Hydrodynamic Model for Protostellar Collapse II. The Second Collapse and The Birth of a Protostar. 査読有り

Masunaga, H. and Inutsuka, S.

Astrophys. J. 531 巻頁： 350-365 2000年

Does "t @ 1" Terminate the Isothermal Evolution of Collapsing Clouds? 査読有り

Masunaga, H. and Inutsuka, S.

Astrophys. J. 510 巻頁： 822-827 1999年

A Radiation Hydrodynamic Model for Protostellar Collapse I. The First Collapse. 査読有り

Masunaga, H., Miyama, S.M., and Inutsuka, S.

Astrophys. J. 495 巻頁： 346-369 1998年

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