Some aspects of break and active monsoon over southern Asia during
                        summer

Hamilton, M. G.

doi:10.3402/tellusa.v29i4.11365

Cited by 11 publications

(1 citation statement)

References 2 publications

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“…The rainfall data were taken from the Indian Daily Weather News, the Records of the Central Meteorological Bureau of China, and other conventional data sources. We have chosen central India as the region representative of the Indian monsoon regime because this area is more sensitive to monsoon anomalies than the rest of the peninsula, as pointed out by Hamilton (1977). On the other hand, the central part of the Qinghai-Xizang (Tibet) Plateau has been selected for comparison with central India, mainly because of the availability of rainfall data at 12 surface stations there, including the Lhasa station.…”

Section: Methods Of Analysismentioning

confidence: 99%

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

Chang

1981

Bull. Amer. Meteor. Soc.

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Based on a comparison of rainfall anomalies between central India and central Tibet in July and August 1979, a negative correlation between them is found. When an active monsoon prevailed over central India, a break monsoon occurred over central Tibet, and vice versa. The large-scale circulation conditions for an active Indian monsoon are characterized by the presence of a large area of negative height departures over the Indian Peninsula and large areas of positive height departures over central Tibet. On the other hand, the circulation conditions responsible for a break monsoon in India are characterized by frequent wave-trough activity over Tibet and the regions to the west of Tibet, and by a dominating high-pressure area over the Indian Peninsula.

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Section: Methods Of Analysismentioning

confidence: 99%

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

Chang

1981

Bull. Amer. Meteor. Soc.

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Low‐level air flow circulation over the Arabian Sea during the summer monsoon as deduced from satellite‐tracked superpressure balloons. Part II‐Analysis of the flow field

Cadet

Olory‐Togbé

1978

Quart J Royal Meteoro Soc

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Trajectories of superpressure balloon flights in the tropical boundary layer over the Indian Ocean during the 1975 summer monsoon are analysed in relation to conventional meteorological observations, mainly ship reports. An assimilation of these randomly distributed observations is performed to compute mean gridded fields of wind and pressure during four periods defined according to monsoon activity over the Indian sub‐continent. Mean cloud cover fields over a 2.5° × 2.5° square are also determined from satellite images. The main features of the low‐level monsoon circulation are deduced from the two sets of data; these are in conflict with earlier conclusions deduced from the interpretation of local conditions. The differences in meteorological fields between the various phases of the activity of the monsoon over India are studied and discussed.

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A study of mean boundary-layer structures over the Arabian Sea and the Bay of Bengal during active and break monsoon periods

Holt

Raman

1987

Boundary-Layer Meteorol

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Observations from research ships which took part in the Indo-Soviet Monsoon Experiment of 1977 (MONSOON 77) and the International Monsoon Experiments (MONEX 79) over the central Arabian Sea and the north central Bay of Bengal were analyzed to study the mean wind and temperature structure of the monsoon boundary layer during active and break conditions. Mean profiles of wind speed and direction along with virtual potential temperature obtained by averaging data from several research ships during 1977 and 1979 indicate that onset conditions were associated with substantial increases in wind speed over the Arabian Sea and a shift to strong southwest flow. Monsoon onset was also characterized by near-neutral to slightly unstable temperature profiles in the lowest kilometer. Break conditions in 1977 in which the monsoon trough moved northward and substantial (5 mb) pressure rises were noted over the Arabian Sea show wind speeds typically decreasing from approximately 18 m s-r during active conditions to roughly 8 m s -'. Temperature profiles during break conditions are similar to those observed in pre-monsoon conditions in that the boundary layer is observed to be generally much more stable up to 900 mb. Above 900 mb, profiles of virtual potential temperature show little variation.Analysis of latent and sensible heat fluxes during June 1977 calculated by the bulk aerodynamic method indicates values oflatent heat flux during active conditions to be roughly two to three times larger than those during break conditions. Sensible heat flux shows an increase from approximately 20 to 80 W me2 during the onset of the monsoon. Surface fluxes of water vapor indicate the importance of water vapor transport over the ship observation region in the central Arabian Sea during active conditions. Onset of the monsoon over the Arabian Sea is accompanied by an increase in the surface moisture flux by a factor of about two. Time histories of precipitable water show decreases of approximately 15 % from active to break periods.

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Some aspects of break and active monsoon over southern Asia during summer

Cited by 11 publications

References 2 publications

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

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

Low‐level air flow circulation over the Arabian Sea during the summer monsoon as deduced from satellite‐tracked superpressure balloons. Part II‐Analysis of the flow field

A study of mean boundary-layer structures over the Arabian Sea and the Bay of Bengal during active and break monsoon periods

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