Relative role of pre-monsoon conditions and intraseasonal oscillations in determining early-vs-late indian monsoon intensity in a GCM
The aim of this paper is to identify relative roles of different land-atmospheric conditions, apart from sea surface temperature (SST), in determining early vs. late summer monsoon intensity over India in a high resolution general circulation model (GCM). We find that in its early phase (June–July;...
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| Veröffentlicht in: | Theoretical and applied climatology 2018, Vol.131 (1-2), p.319-333 |
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| description | The aim of this paper is to identify relative roles of different land-atmospheric conditions, apart from sea surface temperature (SST), in determining early vs. late summer monsoon intensity over India in a high resolution general circulation model (GCM). We find that in its early phase (June–July; JJ), pre-monsoon land-atmospheric processes play major role to modulate the precipitation over Indian region. These effects of pre-monsoon conditions decrease substantially during its later phase (August–September; AS) for which the interannual variation is mainly governed by the low frequency northward propagating intraseasonal oscillations. This intraseasonal variability which is related to mean vertical wind shear has a significant role during the early phase of monsoon as well. Further, using multiple linear regression, we show that interannual variation of early and late monsoon rainfall over India is best explained when all these land-atmospheric parameters are taken together. Our study delineates the relative role of different processes affecting early versus later summer monsoon rainfall over India that can be used for determining its subseasonal predictability. |
| doi_str_mv | 10.1007/s00704-016-1970-z |
| format | Article |
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We find that in its early phase (June–July; JJ), pre-monsoon land-atmospheric processes play major role to modulate the precipitation over Indian region. These effects of pre-monsoon conditions decrease substantially during its later phase (August–September; AS) for which the interannual variation is mainly governed by the low frequency northward propagating intraseasonal oscillations. This intraseasonal variability which is related to mean vertical wind shear has a significant role during the early phase of monsoon as well. Further, using multiple linear regression, we show that interannual variation of early and late monsoon rainfall over India is best explained when all these land-atmospheric parameters are taken together. 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We find that in its early phase (June–July; JJ), pre-monsoon land-atmospheric processes play major role to modulate the precipitation over Indian region. These effects of pre-monsoon conditions decrease substantially during its later phase (August–September; AS) for which the interannual variation is mainly governed by the low frequency northward propagating intraseasonal oscillations. This intraseasonal variability which is related to mean vertical wind shear has a significant role during the early phase of monsoon as well. Further, using multiple linear regression, we show that interannual variation of early and late monsoon rainfall over India is best explained when all these land-atmospheric parameters are taken together. Our study delineates the relative role of different processes affecting early versus later summer monsoon rainfall over India that can be used for determining its subseasonal predictability.</description><subject>Analysis</subject><subject>Annual variations</subject><subject>Aquatic Pollution</subject><subject>Atmospheric conditions</subject><subject>Atmospheric processes</subject><subject>Atmospheric Protection/Air Quality Control/Air Pollution</subject><subject>Atmospheric Sciences</subject><subject>Climate science</subject><subject>Climatology</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>General circulation models</subject><subject>Interannual variability</subject><subject>Madden-Julian oscillation</subject><subject>Monsoon intensity</subject><subject>Monsoon rainfall</subject><subject>Monsoons</subject><subject>Original Paper</subject><subject>Oscillations</subject><subject>Precipitation</subject><subject>Rain</subject><subject>Rainfall</subject><subject>Sea surface</subject><subject>Sea surface temperature</subject><subject>Summer</subject><subject>Summer monsoon</subject><subject>Surface temperature</subject><subject>Vertical wind shear</subject><subject>Waste Water Technology</subject><subject>Water Management</subject><subject>Water Pollution Control</subject><subject>Wind 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intensity in a GCM</title><author>Ghosh, Rohit ; Chakraborty, Arindam ; Nanjundiah, Ravi S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c432t-b1a3c897d6c14f73d5ceeafa25db1e053803a416ac009913063cfe66eb97eb1c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Analysis</topic><topic>Annual variations</topic><topic>Aquatic Pollution</topic><topic>Atmospheric conditions</topic><topic>Atmospheric processes</topic><topic>Atmospheric Protection/Air Quality Control/Air Pollution</topic><topic>Atmospheric Sciences</topic><topic>Climate science</topic><topic>Climatology</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>General circulation models</topic><topic>Interannual variability</topic><topic>Madden-Julian oscillation</topic><topic>Monsoon intensity</topic><topic>Monsoon rainfall</topic><topic>Monsoons</topic><topic>Original Paper</topic><topic>Oscillations</topic><topic>Precipitation</topic><topic>Rain</topic><topic>Rainfall</topic><topic>Sea surface</topic><topic>Sea surface temperature</topic><topic>Summer</topic><topic>Summer monsoon</topic><topic>Surface temperature</topic><topic>Vertical wind shear</topic><topic>Waste Water Technology</topic><topic>Water Management</topic><topic>Water Pollution Control</topic><topic>Wind shear</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ghosh, Rohit</creatorcontrib><creatorcontrib>Chakraborty, Arindam</creatorcontrib><creatorcontrib>Nanjundiah, Ravi S</creatorcontrib><collection>Springer Nature OA/Free Journals</collection><collection>CrossRef</collection><collection>Gale In Context: Science</collection><collection>ProQuest Central (Corporate)</collection><collection>Aqualine</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Water 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determining early vs. late summer monsoon intensity over India in a high resolution general circulation model (GCM). We find that in its early phase (June–July; JJ), pre-monsoon land-atmospheric processes play major role to modulate the precipitation over Indian region. These effects of pre-monsoon conditions decrease substantially during its later phase (August–September; AS) for which the interannual variation is mainly governed by the low frequency northward propagating intraseasonal oscillations. This intraseasonal variability which is related to mean vertical wind shear has a significant role during the early phase of monsoon as well. Further, using multiple linear regression, we show that interannual variation of early and late monsoon rainfall over India is best explained when all these land-atmospheric parameters are taken together. Our study delineates the relative role of different processes affecting early versus later summer monsoon rainfall over India that can be used for determining its subseasonal predictability.</abstract><cop>Vienna</cop><pub>Springer Vienna</pub><doi>10.1007/s00704-016-1970-z</doi><tpages>15</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Theoretical and applied climatology, 2018, Vol.131 (1-2), p.319-333 |
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| subjects | Analysis Annual variations Aquatic Pollution Atmospheric conditions Atmospheric processes Atmospheric Protection/Air Quality Control/Air Pollution Atmospheric Sciences Climate science Climatology Earth and Environmental Science Earth Sciences General circulation models Interannual variability Madden-Julian oscillation Monsoon intensity Monsoon rainfall Monsoons Original Paper Oscillations Precipitation Rain Rainfall Sea surface Sea surface temperature Summer Summer monsoon Surface temperature Vertical wind shear Waste Water Technology Water Management Water Pollution Control Wind shear |
| title | Relative role of pre-monsoon conditions and intraseasonal oscillations in determining early-vs-late indian monsoon intensity in a GCM |
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