A Contrasting Study of the Rainfall Anomalies between Central Tibet and Central India during the Summer Monsoon Season of 1979

Chang, C. C.

doi:10.1175/1520-0477(1981)062<0020:acsotr>2.0.co;2

Cited by 11 publications

(7 citation statements)

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“…The heavy precipitation during the 1993 monsoon was caused by moisture intrusion through the synoptic trough with meandering westerlies [ Ueno , 1998]. On a sub‐seasonal timescale, Chang [1981] has found an inverse correlation of precipitation amount in central India and that in the central TP, with a timescale of about 15 and 40 days. The plateau's summer monsoon break corresponds with an active phase of the Indian summer monsoon.…”

Section: Introductionmentioning

confidence: 99%

Water vapor transport for summer precipitation over the Tibetan Plateau: Multidata set analysis

2012

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[1] The atmospheric water vapor transport for summer precipitation over the southeastern Tibetan Plateau (hereafter TP) during 1979-2002 is examined by using five precipitation data sets and three reanalysis data sets. The multidata ensemble mean shows that under climate mean conditions, TP is a moisture sink in summer, having a net moisture convergence of 4 mm/day. The climatological water vapor transport from the southern boundary, which originates from the Indian Ocean and the Bay of Bengal, dominates the summer precipitation over the southeastern TP. It is estimated that the water vapor from the western boundary along the southern edge of the TP is about 32% of that from the southern boundary. The summer precipitation over the southeastern TP exhibits strong interannual variability, with a standard deviation of 1.3 mm/day, but no significant long-term trend. The water vapor transport for the interannual variability of summer rainfall over the southeastern TP mainly comes from the western boundary of the TP, which is originally from lower latitudes. An excessive rainfall anomaly of 1 mm/day over the southeastern TP is associated with an anomalous water vapor input of 138 (104) kg/m/s from the western (southern) boundary. It is worth noting that the quantitative analysis in this study is determined by the setting of the domain. The interannual variability of summer precipitation over the southeastern TP is dominated by an anomalous anticyclone over the northern Indian subcontinent and the Bay of Bengal, which intensifies the water vapor transport along the southern edge of the TP and leads to more water vapor convergence over the southeastern TP, thus the excessive rainfall in the area.Citation: Feng, L., and T. Zhou (2012), Water vapor transport for summer precipitation over the Tibetan Plateau: Multidata set analysis,

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Section: Introductionmentioning

confidence: 99%

Water vapor transport for summer precipitation over the Tibetan Plateau: Multidata set analysis

2012

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“…The 40-day timescale is caused by the northward movement of cloud disturbance over the Asian monsoon region (60°−120°E), which is initiated by eastward propagating of clouds corresponded with the Madden-Julian Oscillation (e.g., Yasunari 1979;Yasunari 1981;Lau and Chan 1986). Chang (1981) indicated an inverse correlation between the precipitation amount in central India and that in the central TP with the timescale of about 15 and 40 days. In other words, the active phase of the Indian monsoon corresponded to the break phase of the plateau monsoon, meaning that active WV supply into the TP could occur during the break phase of the Indian monsoon.…”

Section: Introductionmentioning

confidence: 99%

Transportation of Water Vapor into the Tibetan Plateau in the Case of a Passing Synoptic-Scale Trough

Sugimoto

Ueno

Sha

2008

Journal of the Meteorological Society of Japan

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The passing of a synoptic trough is expected to contribute strongly to water vapor (WV) transport processes from the Indian Ocean to the Tibetan Plateau (TP) during the monsoon season. However, the pathway of the WV into the plateau associated with passing a trough and its contribution to the WV budget over the TP are not clear. In this study, the processes of WV transport in the case of a passing trough in 1998 were analyzed using GAME reanalysis data and the numerical model, focusing especially on the WV transportation pattern in the Indian Monsoon region and the diurnal variation of WV intrusion from south of the Himalayas to the TP.WV advection into the TP was larger in the case of a passing synoptic trough than in the case of a prevailing Tibetan High. Sub-continental scale circulation for the two synoptic types corresponded with active/break phase of the Indian monsoon. In case of prevailing Tibetan High, a cyclonic circulation with a low-pressure area over India, associated with active Indian monsoon phase, prevented the WV intrusion into the TP in the middle troposphere. However, in the case of the trough that corresponded with break phase of Indian Monsoon, WV was transported directly from Arabian Sea to the southern foot of the Himalayas with a northward shift of the low-level monsoon westerly and it intruded into the southeastern TP.Numerical experiments showed that the WV transport process was composed of multiple steps in the case of the passing trough. WV was transported by the monsoon westerly to the southern foot of the Himalayas at 1500 m above sea level (a.s.l.). The moist air mass reached south of the TP with at about 5500 m a.s.l. during the noon to evening because of the development of a mixing layer and the enhancement of an upslope wind in southern slope of the Himalayas. A moist southwesterly flow was converged latitudinally in the southeastern TP because of the dry northwesterly flow prevailing in the rear of the passing trough over the TP. This convergence area expanded northward from mid-afternoon into the night and disappeared early next morning.

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“…They have also shown that the thermal contrast between the TP and the equatorial cold tongue is significantly related to the Indian summer monsoon rainfall (ISMR: June to September total rainfall). The relationship between the atmospheric conditions over the TP and that in its surrounding areas has also been demonstrated by Chang (1981), who found that there is an inverse relationship between central ISMR and central Tibet precipitation in July and August.…”

Section: Introductionmentioning

confidence: 57%

Thermal field over Tibetan Plateau and Indian summer monsoon rainfall

Bansod

Yin

Lin

et al. 2003

Intl Journal of Climatology

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The interannual variability of the temperature anomalies over the Tibetan Plateau (25-45°N, 75-105°E) is examined in relation to the Indian summer monsoon rainfall (ISMR: June to September total rainfall). For this purpose, the temperature anomaly data of the central-eastern Tibetan Plateau is divided into three regions using principal component analysis and the ISMR data for the period 1957-89 have been used. It is found that the January temperature anomaly of Region 2 has a significant negative relationship (r = −0.67) with the ISMR of the subsequent season. This region is located over the northeastern part of the Tibetan Plateau, mostly in Qinghai province, including the Bayan Harr Mountain range and the Qaidam Basin. This relationship is consistent and robust during the period of analysis and can be used to predict the strength of the Indian summer monsoon in the subsequent season. It was found that the January temperature anomaly in this region was associated with a persistent winter circulation pattern over the Eurasian continent during January through to March. Finally, the variation patterns of the temperature anomalies in all three regions over the central-eastern Tibetan Plateau during extreme years of the ISMR are examined. It is concluded that the January temperature anomaly over the northeastern Tibetan Plateau can be useful in forecasting the drought and flood conditions over India, especially in predicting the monsoon rainfall over the areas lying along the monsoon trough.

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A Contrasting Study of the Rainfall Anomalies between Central Tibet and Central India during the Summer Monsoon Season of 1979

Cited by 11 publications

References 1 publication

Water vapor transport for summer precipitation over the Tibetan Plateau: Multidata set analysis

Water vapor transport for summer precipitation over the Tibetan Plateau: Multidata set analysis

Transportation of Water Vapor into the Tibetan Plateau in the Case of a Passing Synoptic-Scale Trough

Thermal field over Tibetan Plateau and Indian summer monsoon rainfall

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