Diurnal Variations of the Meiyu/Baiu Rain Belt

Geng, Biao; Yamada, Hiroyuki

doi:10.2151/sola.2007-016

Cited by 35 publications

(32 citation statements)

References 13 publications

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“…The TP and other mountain ranges are important factors in organizing and modulating precipitation during the Asian summer monsoon period (Xie et al 2006). The dual influence of complex topography and the summer monsoon on the diurnal variations of warm-season precipitation over this region has been noted in many recent studies (e.g., Geng and Yamada 2007;Wang et al 2004Wang et al , 2005Yu et al 2007a,b;Chen et al 2009;Chen et al 2010). Some of these studies also examined the regional difference of diurnal precipitation variations and propagation (e.g., Wang et al 2004Wang et al , 2005Hirose and Nakamura 2005).…”

Section: Introductionmentioning

confidence: 95%

Diurnal Variations of Warm-Season Precipitation East of the Tibetan Plateau over China

2011

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This study explores the diurnal variations of the warm-season precipitation to the east of the Tibetan Plateau over China using the high-resolution NOAA/Climate Prediction Center morphing technique (CMORPH) precipitation data and the Global Forecast System (GFS) gridded analyses during mid-May to mid-August of 2003-09. Complementary to the past studies using satellite or surface observations, it is found that there are strong diurnal variations in the summertime precipitation over the focus domain to the east of the Tibetan Plateau. These diurnal precipitation cycles are strongly associated with several thermally driven regional mountain-plains solenoids due to the differential heating between the Tibetan Plateau, the highlands, the plains, and the ocean. The diurnal cycles differ substantially from region to region and during the three different month-long periods: the pre-mei-yu period (15 May-15 June), the mei-yu period (15 June-15 July), and the post-mei-yu period (15 July-15 August).In particular, there is a substantial difference in the propagation speed and eastward extent of the peak phase of the dominant diurnal precipitation cycle that is originated from the Tibetan Plateau. This diurnal peak has a faster (slower) eastward propagation speed, the more (less) coherent propagation duration, and thus covers the longest (shortest) distance to the east during the pre-mei-yu (post-mei-yu) period than that during the mei-yu period. The differences in the mean midlatitude westerly flow and in the positioning and strength of the western Pacific subtropical high during different periods are the key factors in explaining the difference in the propagation speed and the eastward extent of this dominant diurnal precipitation cycle.

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Section: Introductionmentioning

confidence: 95%

Diurnal Variations of Warm-Season Precipitation East of the Tibetan Plateau over China

2011

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“…Previous studies have noted that warm-season convection in the northern hemisphere often forms over the high mountains during the afternoon and subsequently propagates eastward across the lee-side plains overnight due to diurnal changes in diabatic heating between regions with different surface topography (Ding, 1993;Geng and Yamada, 2007;Carbone et al, 2002, hereafter, CAR02;Carbone and Turtle, 2008;Trier et al, 2006Trier et al, , 2010Wang et al, 2004Wang et al, , 2005He and Zhang, 2010, hereafter HZ10;Huang et al, 2010;Bao et al, 2011, hereafter BZS11). The terrains of both East Asia and North America feature a western plateau (mountainous region) and an eastern low-lying plain.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the diurnal variations of warm-season precipitation for East Asia vs. North America downstream of the Tibetan Plateau vs. the Rocky Mountains

Zhang

Sun

2014

Atmos. Chem. Phys.

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Abstract.A wave-number-frequency spectral decomposition technique is used to analyze the high-resolution NOAA/Climate Prediction Center morphing technique (CMORPH) precipitation data set and to explore the differences and similarities of the diurnal variation of warm-season precipitation in the East Asia and North America downstream of big topography. The predominant phase speed of precipitation at different time scales for North America, averaged over all warm-season months (May-August) for [2003][2004][2005][2006][2007][2008][2009][2010], is ∼ 20 ms −1 , which is faster than the speed of ∼ 14 ms −1 calculated for East Asia. Consistent with the recent studies of the precipitation diurnal cycles for these two regions, the difference in the diurnal phase propagation is likely due to the difference in the mean steering level wind speed for these two regions. The wave-number-frequency spectral analysis further reveals the complex, multi-scale, multi-modal nature of the warm-season precipitation variation embedded within the diurnal cycle over both continents, with phase speeds varying from 10 to 30 ms −1 and wave periods varying from diurnal to a few hours. At the diurnal frequency regulated by the thermodynamically driven mountains-plains solenoids (MPSs), increased precipitation for both continents first originates in the afternoon from the eastern edge of big topography and subsequently moves downslope in the evening and reaches the broad plains area at night. More complex diurnal evolutions are observed in East Asia due to the more complex, multistep terrains east of the Tibetan Plateau and the associated localized MPS circulations. Nevertheless, increased variation of precipitation at smaller spatial and temporal scales is evident in the active phase of the dominant diurnal cycle for both continents.

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“…Meanwhile, the rainfall and reflectivity in mei-yu present significant diurnal variation, which usually enhance from midnight to EM (Luo et al 2003;Geng and Yamada 2007;Chen et al 2010). Previous studies based on limited station observations or Tropical Rainfall Measuring Mission (TRMM) products presented indications that the nighttime or morning rainfall over eastern China may undergo seasonal advance and retreat, which is possibly related to the movement of EASM Yin et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Subseasonal Characteristics of Diurnal Variation in Summer Monsoon Rainfall over Central Eastern China

Yuan

Chen

et al. 2010

Journal of Climate

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Subseasonal characteristics of the diurnal variation of the summer monsoon rainfall over central eastern China (258-408N, 1108 are analyzed using hourly station rain gauge data. Results show that the rainfall in the monsoon rain belt is dominated by the long-duration rainfall events ($7 h) with early-morning peaks. The long-duration rainfall events and early-morning diurnal peaks experience subseasonal movement that is similar to that of the monsoon rain belt. When the monsoon rainfall is separated into the active and break periods, the long-duration early-morning precipitation dominates the active period, which is in sharp contrast to the short-duration (#6 h) rainfall with leading late-afternoon diurnal peaks during the break period. The combination of different diurnal features of monsoon rainfall in the active and break monsoon periods also explains the less coherent diurnal phases of summer mean rainfall over central eastern China. The cause of the early-morning peak of rainfall during the active monsoon period is discussed.

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Diurnal Variations of the Meiyu/Baiu Rain Belt

Cited by 35 publications

References 13 publications

Diurnal Variations of Warm-Season Precipitation East of the Tibetan Plateau over China

Diurnal Variations of Warm-Season Precipitation East of the Tibetan Plateau over China

Comparison of the diurnal variations of warm-season precipitation for East Asia vs. North America downstream of the Tibetan Plateau vs. the Rocky Mountains

Subseasonal Characteristics of Diurnal Variation in Summer Monsoon Rainfall over Central Eastern China

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