Large-Scale features of the indian summer monsoon rainfall and their association with some oceanic and atmospheric variables

Prasad, K. D.; Singh, S. V.

doi:10.1007/bf02656794

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…Though the region on the eastern side of Eastern Ghat is not a separate homogeneous region when considering the loadings >0.2, it behaves like a separate homogeneous region when considering the equal signs of loadings (either all positive or all negative) over different stations for all the significant EOFs. Prasad and Singh (1988) regionalized India by assuming that the region over which the …”

Section: Rotated Eofs In T-modementioning

confidence: 99%

“…There have been many studies on spatial variability of rainfall over India, e.g. Rakhecha and Mandal (1981), Hastenrath and Rosen (1983), Rasmusson and Carpenter (1983), Prasad and Singh (1988), Kripalani et al (1991) and Majumdar (1998).…”

Section: Introductionmentioning

confidence: 99%

“…Studies on spatial variability of monsoon rainfall over India using EOF/PCA include those of Bedi and Bindra (1980) on seasonal (June-September) monsoon rainfall of 70 stations during 1911-70; of Hastenrath and Rosen (1983) on annual total rainfall of 31 meteorological subdivisions of contiguous India during 1900-72, as estimated by the India Meteorological Department (IMD); of Rasmusson and Carpenter (1983) on seasonal area-weighted monsoon rainfall of 31 meteorological subdivisions calculated from 31 representative stations during 1875-1979of Shukla (1987) on seasonal monsoon rainfall of 31 meteorological subdivisions during 1901-70 of Prasad and Singh (1988) on area-weighted seasonal moonsoon rainfall of 31 subdivisions during 1901-80; and of Gregory (1989) on area-weighted seasonal rainfall of 29 meteorological subdivisions during 1871-1985 as calculated from rainfall over 306 stations representing 306 districts of contiguous India (Parthasarathy et al, 1987). Applications of EOF/PCA in the medium-range scale have been made by Gadgil and Iyengar (1980), Kripalani et al (1991) and Majumdar (1998).…”

Section: Introductionmentioning

confidence: 99%

“…This zonal band is also the region of the monsoon trough and movement of low-pressure systems like depressions, etc., developing over the Bay of Bengal. Whereas Orissa and Gangetic West Bengal constitute a separate homogeneous region according to Prasad and Singh (1988), Orissa, Chhatishgarh and east Madhya Pradesh constitute a homogeneous region according to Gregory (1989).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of daily rainfall over Orissa, India, during the southwest summer monsoon season

Mohapatra

Mohanty

Behera

2003

Intl Journal of Climatology

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Southwest summer monsoon rainfall over Orissa, a state of eastern India, shows characteristic spatial and temporal variability, due to the interaction of basic westerly flow with orography and the synoptic-scale monsoon disturbances developing over the northern Bay of Bengal and moving west-northwestwards along the monsoon trough. The aim of this study is to find out the main features of the spatial variability of daily monsoon rainfall over Orissa and associated synoptic systems. Empirical orthogonal function (EOF) analysis is a good tool to filter out the main components from any noise, and this was applied to daily monsoon rainfall (June-September) data of 31 uniformly distributed stations over a period of 20 years (1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999). The association of synoptic systems with significant EOFs has been confirmed by analysing daily synoptic systems over Orissa and its neighbourhood during the same period.The first three EOFs in S-mode may be attributed to good monsoon rainfall in association with low-pressure systems/cyclonic circulation (LPSC), like lows, depressions, cyclonic storms and cyclonic circulation extending up to the mid-tropospheric level over the northwest (NW) Bay/NW and the adjoining northeast (NE) Bay, over Gangetic West Bengal (GWB) and over Orissa/NW and the adjoining west central (WC) Bay. The fourth and fifth EOFs may be attributed to a weak monsoon condition being associated only with a monsoon trough without any embedded system and LPSC over the NE and the adjoining NW Bay respectively. Based on rotation of significant EOFs in T-mode, which gives better regionalization, Orissa consists of five homogeneous regions of daily monsoon rainfall: (i) eastern Orissa, (ii) western Orissa, (iii) northwest Orissa, (iv) north Orissa and (v) northeast Orissa. Eastern Orissa gets higher rainfall than the other regions, due to LPSC over NW Bay/NW and the adjoining NE Bay, western Orissa rainfall is due to LPSC over Orissa/NW and the adjoining WC Bay; likewise, northwest Orissa rainfall is due to LPSC over GWB, north Orissa rainfall is due to LPSC over the NE and the adjoining NW Bay, and northeast Orissa rainfall is due only to a monsoon trough without any significant embedded system over Orissa and adjoining land/sea areas.

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Section: Rotated Eofs In T-modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spatial variability of daily rainfall over Orissa, India, during the southwest summer monsoon season

Mohapatra

Mohanty

Behera

2003

Intl Journal of Climatology

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“…It is known that monsoons exhibit variability even on inter-decadal time scales in association with many other global climate variables. The complexities of the ISM have been studied by several authors emphasizing its spatial variability [1][2][3][4][5][6][7][8][9]. The spatial variability of ISM has also been studied by a few researchers [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Monsoon Rainfall Variability over India and the Odisha State

Gouda

Sahoo

Samantray

et al. 2017

Climate

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Indian summer monsoon (ISM) plays an important role in the weather and climate system over India. The rainfall during monsoon season controls many sectors from agriculture, food, energy, and water, to the management of disasters. Being a coastal province on the eastern side of India, Odisha is one of the most important states affected by the monsoon rainfall and associated hydro-meteorological systems. The variability of monsoon rainfall is highly unpredictable at multiple scales both in space and time. In this study, the monsoon variability over the state of Odisha is studied using the daily gridded rainfall data from India Meteorological Department (IMD). A comparative analysis of the behaviour of monsoon rainfall at a larger scale (India), regional scale (Odisha), and sub-regional scale (zones of Odisha) is carried out in terms of the seasonal cycle of monsoon rainfall and its interannual variability. It is seen that there is no synchronization in the seasonal monsoon category (normal/excess/deficit) when analysed over large (India) and regional (Odisha) scales. The impact of El Niño, La Niña, and the Indian Ocean Dipole (IOD) on the monsoon rainfall at both scales (large scale and regional scale) is analysed and compared. The results show that the impact is much more for rainfall over India, but it has no such relation with the rainfall over Odisha. It is also observed that there is a positive (negative) relation of the IOD with the seasonal monsoon rainfall variability over Odisha (India). The correlation between the IAV of monsoon rainfall between the large scale and regional scale was found to be 0.46 with a phase synchronization of 63%. IAV on a sub-regional scale is also presented.

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Interannual variations of outgoing longwave radiation and Indian summer monsoon rainfall

Prasad

Bansod

2000

Int. J. Climatol.

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The outgoing longwave radiation (OLR) over tropical Asia has been analysed for a relationship with the Indian summer monsoon rainfall (ISMR; June–September) total using 19 years' data. The ISMR is found to be negatively associated with a simultaneous period of OLR variation over west–central India and the south Equatorial Indian Ocean, and positively associated with that of the variation over the east of Madagascar Sea. The OLR of west–central India, particularly, is strongly coupled with the ISMR. The averaged OLR for west–central India (index A) accounts for 92% of the total variance of the ISMR, and hence, index A (with opposite sign) can be considered as a proxy of the ISMR variability. The relationship between index A and the ISMR is found to be stable. The monthly scale variation of these two parameters (i.e. all‐India rainfall and OLR averaged for west–central India) also exhibits a significant association during each of the summer monsoon (June–September) months. However, the association appears better in the latter half (August–September), as compared with the first half (June–July), of the season. The ISMR can be estimated with a high degree of accuracy through a linear regression model using index A. Index A, thus, appears useful in updating the ISMR series, which is generally accomplished by averaging the area weighted rainfall of 306 stations distributed over India. Similarly, index A can be computed with a high degree of accuracy through a linear regression model using the ISMR. The relationship can be utilized in filling the OLR data gap for 1978 over west–central India. The study further provides scope for investigating interannual variability of the Indian summer monsoon in relation to climate variability of the global tropics. Copyright © 2000 Royal Meteorological Society

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Large-Scale features of the indian summer monsoon rainfall and their association with some oceanic and atmospheric variables

Cited by 12 publications

References 8 publications

Spatial variability of daily rainfall over Orissa, India, during the southwest summer monsoon season

Spatial variability of daily rainfall over Orissa, India, during the southwest summer monsoon season

Comparative Study of Monsoon Rainfall Variability over India and the Odisha State

Interannual variations of outgoing longwave radiation and Indian summer monsoon rainfall

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