Diurnal variations in summer season precipitation in India

Shouraseni S Roy, Robert C. Balling

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

In the present study, we have analyzed the spatial patterns in the diurnal cycle of precipitation over the Indian subcontinent. We assembled hourly precipitation data for 78 stations spread across the Indian subcontinent for the period 1980 to 2000. On the basis of the results of the first harmonic, we found the presence of a distinct diurnal cycle over most of the Indian subcontinent for frequency, total, and intensity of precipitation events. The standardized amplitudes, indicative of the strength of diurnal cycle over a region, are strongest in peninsular India, with greater than 80% explained variance. The diurnal spatial patterns are broadly a result of the interaction of local orography and convectional processes. The time of maximum precipitation along the west coast is predominantly concentrated a few hours after midnight to predawn hours. The interiors of the subcontinent generally experience late afternoon to early evening showers, which may be attributed to local convective processes. The time of maximum for total amount of precipitation are mostly about half an hour to 1 h before the time of maximum for the frequency. The overall patterns of diurnal cycle were also found to be robust against interannual variations, in the form of ENSO and La Niña years.

Original languageEnglish (US)
Pages (from-to)969-976
Number of pages8
JournalInternational Journal of Climatology
Volume27
Issue number7
DOIs
StatePublished - Jun 15 2007

Fingerprint

diurnal variation
summer
orography
El Nino-Southern Oscillation
annual variation
coast
station

Keywords

  • Diurnal
  • Harmonics
  • India
  • Monsoon
  • Precipitation

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Diurnal variations in summer season precipitation in India. / Roy, Shouraseni S; Balling, Robert C.

In: International Journal of Climatology, Vol. 27, No. 7, 15.06.2007, p. 969-976.

Research output: Contribution to journalArticle

@article{8ba24cbd133845eba90ea216bce59756,
title = "Diurnal variations in summer season precipitation in India",
abstract = "In the present study, we have analyzed the spatial patterns in the diurnal cycle of precipitation over the Indian subcontinent. We assembled hourly precipitation data for 78 stations spread across the Indian subcontinent for the period 1980 to 2000. On the basis of the results of the first harmonic, we found the presence of a distinct diurnal cycle over most of the Indian subcontinent for frequency, total, and intensity of precipitation events. The standardized amplitudes, indicative of the strength of diurnal cycle over a region, are strongest in peninsular India, with greater than 80{\%} explained variance. The diurnal spatial patterns are broadly a result of the interaction of local orography and convectional processes. The time of maximum precipitation along the west coast is predominantly concentrated a few hours after midnight to predawn hours. The interiors of the subcontinent generally experience late afternoon to early evening showers, which may be attributed to local convective processes. The time of maximum for total amount of precipitation are mostly about half an hour to 1 h before the time of maximum for the frequency. The overall patterns of diurnal cycle were also found to be robust against interannual variations, in the form of ENSO and La Ni{\~n}a years.",
keywords = "Diurnal, Harmonics, India, Monsoon, Precipitation",
author = "Roy, {Shouraseni S} and Balling, {Robert C.}",
year = "2007",
month = "6",
day = "15",
doi = "10.1002/joc.1458",
language = "English (US)",
volume = "27",
pages = "969--976",
journal = "International Journal of Climatology",
issn = "0899-8418",
publisher = "John Wiley and Sons Ltd",
number = "7",

}

TY - JOUR

T1 - Diurnal variations in summer season precipitation in India

AU - Roy, Shouraseni S

AU - Balling, Robert C.

PY - 2007/6/15

Y1 - 2007/6/15

N2 - In the present study, we have analyzed the spatial patterns in the diurnal cycle of precipitation over the Indian subcontinent. We assembled hourly precipitation data for 78 stations spread across the Indian subcontinent for the period 1980 to 2000. On the basis of the results of the first harmonic, we found the presence of a distinct diurnal cycle over most of the Indian subcontinent for frequency, total, and intensity of precipitation events. The standardized amplitudes, indicative of the strength of diurnal cycle over a region, are strongest in peninsular India, with greater than 80% explained variance. The diurnal spatial patterns are broadly a result of the interaction of local orography and convectional processes. The time of maximum precipitation along the west coast is predominantly concentrated a few hours after midnight to predawn hours. The interiors of the subcontinent generally experience late afternoon to early evening showers, which may be attributed to local convective processes. The time of maximum for total amount of precipitation are mostly about half an hour to 1 h before the time of maximum for the frequency. The overall patterns of diurnal cycle were also found to be robust against interannual variations, in the form of ENSO and La Niña years.

AB - In the present study, we have analyzed the spatial patterns in the diurnal cycle of precipitation over the Indian subcontinent. We assembled hourly precipitation data for 78 stations spread across the Indian subcontinent for the period 1980 to 2000. On the basis of the results of the first harmonic, we found the presence of a distinct diurnal cycle over most of the Indian subcontinent for frequency, total, and intensity of precipitation events. The standardized amplitudes, indicative of the strength of diurnal cycle over a region, are strongest in peninsular India, with greater than 80% explained variance. The diurnal spatial patterns are broadly a result of the interaction of local orography and convectional processes. The time of maximum precipitation along the west coast is predominantly concentrated a few hours after midnight to predawn hours. The interiors of the subcontinent generally experience late afternoon to early evening showers, which may be attributed to local convective processes. The time of maximum for total amount of precipitation are mostly about half an hour to 1 h before the time of maximum for the frequency. The overall patterns of diurnal cycle were also found to be robust against interannual variations, in the form of ENSO and La Niña years.

KW - Diurnal

KW - Harmonics

KW - India

KW - Monsoon

KW - Precipitation

UR - http://www.scopus.com/inward/record.url?scp=34250310847&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34250310847&partnerID=8YFLogxK

U2 - 10.1002/joc.1458

DO - 10.1002/joc.1458

M3 - Article

VL - 27

SP - 969

EP - 976

JO - International Journal of Climatology

JF - International Journal of Climatology

SN - 0899-8418

IS - 7

ER -