Diurnal Variations of Satellite-Measured TBB Areal Distribution and Eye Diameter of Mature Typhoons

Muramatsu, Teruo

doi:10.2151/jmsj1965.61.1_77

Cited by 59 publications

(66 citation statements)

References 11 publications

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“…Cumulonimbus clouds, warm cirrus (TBB> -20C) clouds and low level cumulus/stratocumulus clouds show tendencies toward larger cloud cover at night (2:30 local time). These findings are consistent with previous works (Muramatsu, 1983;Minnis and Harrison, 1984). Cold cirrus (TBB<-20C) clouds show a tendency toward larger cloud cover during the day (14:30 local time).…”

Section: Discussionsupporting

confidence: 93%

“…These day-to-night cloud cover change for cloud types are seen more clearly over the tropical ocean than in typhoon cases. This tendency agrees with the analysis by Muramatsu (1983) for mature typhoons. He found early morning enhancement of convective activity and gradual expansion of cirrus anvils due to active convection near the center of typhoons.…”

Section: Cloud Cover For Typhoon Casessupporting

confidence: 92%

“…However, cloud cover of warmer clouds (TBB<-20C) show a larger value during the day. These results are also consistent with Muramatsu (1983).…”

Section: Cloud Cover For Typhoon Casessupporting

confidence: 91%

“…6). Muramatsu (1983) show larger values at night. However, cloud cover of warmer clouds (TBB<-20C) show a larger value during the day.…”

Section: Cloud Cover For Typhoon Casesmentioning

confidence: 86%

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Day-to-Night Cloudiness Change of Cloud Types Inferred from Split Window Measurements aboard NOAA Polar-Orbiting Satellites

Inoue¹

1997

Journal of the Meteorological Society of Japan

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Split window measurements aboard the NOAA polar orbiting satellites have been used to study cloud cover change between day and night over the western Pacific. The split window technique can discriminate optically thin cirrus type clouds (ice clouds) from optically thick cumulus type clouds. In this study, cirrus and cumulus type clouds are each divided into two classes depending on cloud brightness temperatures (TBB). Cirrus are classified as either warm or cold type, while cumulus type are divided into cumulonimbus type and low-level cumulus/stratocumulus type. From the comparison with ISCCP analysis, mean optical thickness of warm cirrus, cold cirrus, cumulus/stratocumulus and cumulonimbus type clouds were found to be 2.2, 7.4, 15.3 and 33.7, respectively.The diurnal change in cloud cover of the above cloud types is studied for typhoon cases as individual convective systems and for an area of 20 degrees latitude by 30 degrees longitude over the western tropical Pacific. Cumulonimbus type clouds, warm cirrus type clouds and low-level cumulus/stratocumulus type clouds show tendencies toward higher cloud cover at night (about 2:30 local time). Cold cirrus type clouds show a tendency toward more cloud cover during the day (about 14:30 local time).

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Section: Discussionsupporting

confidence: 93%

Section: Cloud Cover For Typhoon Casessupporting

confidence: 92%

“…However, cloud cover of warmer clouds (TBB<-20C) show a larger value during the day. These results are also consistent with Muramatsu (1983).…”

Section: Cloud Cover For Typhoon Casessupporting

confidence: 91%

“…6). Muramatsu (1983) show larger values at night. However, cloud cover of warmer clouds (TBB<-20C) show a larger value during the day.…”

Section: Cloud Cover For Typhoon Casesmentioning

confidence: 86%

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Day-to-Night Cloudiness Change of Cloud Types Inferred from Split Window Measurements aboard NOAA Polar-Orbiting Satellites

Inoue¹

1997

Journal of the Meteorological Society of Japan

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“…Diurnal variations of convection area (TBB < -75C) with a maximum around morning (00 UTC, local time 09 h) followed by that of cloud area (TBB < -60C) with maximum around noon (03 UTC, local time 12 h) was observed on 31 August and 1 September, which is roughly similar to a diurnal variation of eyewall and spiral band convection in mature typhoons (Muramatsu, 1983). Formation of CDO from 30 to 31 August appeared to be overlapped on the convection diurnal variation (Fig.…”

Section: Overview Of Yancysupporting

confidence: 56%

Structure and Evolution of Convection within Typhoon Yancy (T9313) in the Early Developing Stage Observed by the Keifu Maru Radar

Mori¹,

Ishigaki²,

Maehira³

et al. 1999

Journal of the Meteorological Society of Japan

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Typhoon Yancy (T9313), which was in the early gradual developing stage and moved westward over the northwestern Pacific near (19N, 129E), was observed by the Japan Meteorological Agency research vessel Keifu Maru, during 30 August to 1 September 1993. During that period, the circulation center of Yancy approached as close as 80 km to the north of the Keifu Maru. Convection in the major part of Yancy was analyzed using the radar, maritime weather and upper air observation data obtained on the ship and recently available satellite data. Cell echo tracking winds (CETwinds) were estimated and utilized to supplement low level wind data around Yancy.During the early developing stage, an in-concentric structure of Yancy in which a cloud system existed in a southwest quadrant of a lower-level cyclonic circulation (LLCC) of 1500 km scale was transformed to a concentric one through a formation of a central dense overcast ('CDO') in the cloud system. After the establishment of the concentric structure, Yancy began rapid development.Various mesoscale (100-500 km) precipitation features (MPFs) were organized and evolved successively within Yancy. The configurations of the MPFs were changed as the early developing process progressed through four sub-stages. In the initial sub-stage, a large (400 km) echo system (LES) was organized in the southwest quadrant of the LLCC, over which a round cloud system appeared. In the second sub-stage, a long lasting mesoscale intense convective area (MICA) was formed around the northwestern edge of the LES, which was a mesoscale precipitation entity of the 'CDO' in the round cloud system. LLCC appeared to be intensified on a 500 km scale after the formation of MICA. In the third sub-stage, LES and the cloud system evolved into a comma-shaped spiral band with length over 500 km in the intense cyclonic circulation. In the final sub-stage, curvature of the spiral band was increased and an inner near-circular spiral band emerged in the further intensified LLCC. The northern head of the comma-shaped cloud system was encircling the LLCC center. Line systems transversal and longitudinal to lower-level circulation were formed around MICA in the first sub-stage, and in the second sub-stage, respectively.

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Diurnal variations of tropical cyclone outer region size growth

Hong

2023

Atmospheric Science Letters

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Various aspects of tropical cyclones (TCs) fluctuate with the diurnal cycle. TC size is critical to the extent of its damage, but diurnal variations in the growth of the outer region size have largely remained unexplored. This paper examines the diurnal variations in the growth of the radius of gale‐force winds (34 kt; R34) by analyzing best‐track data from 2001 to 2019 for both North Atlantic TCs and global TCs outside of the North Atlantic region. Statistically significant diurnal variations was found for R34 growth, with the maximum 6‐h growth rate occurring at 2100–0300 local solar time (LST) for North Atlantic TCs, and at 0300–0900 LST for global TCs excluding the North Atlantic which experienced rapid intensification (≥30 knots within 24 h). The higher R34 6‐h growth rates during the night were linked to a larger extent of very deep convective clouds with infrared brightness temperatures <208 K during this time.

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Diurnal Variations of Satellite-Measured TBB Areal Distribution and Eye Diameter of Mature Typhoons

Cited by 59 publications

References 11 publications

Day-to-Night Cloudiness Change of Cloud Types Inferred from Split Window Measurements aboard NOAA Polar-Orbiting Satellites

Day-to-Night Cloudiness Change of Cloud Types Inferred from Split Window Measurements aboard NOAA Polar-Orbiting Satellites

Structure and Evolution of Convection within Typhoon Yancy (T9313) in the Early Developing Stage Observed by the Keifu Maru Radar

Diurnal variations of tropical cyclone outer region size growth

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