A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea
Abstract A local index for describing intraseasonal variability over the Maritime Continent is developed. The index is based on the ratio of area‐averaged rain rate over the land to that over the sea. It takes advantage of the fact that the main convective envelope of intraseasonal variability event...
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| Format: | Article |
| Language: | English |
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Wiley
2016-09-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL069987 |
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| author | C. L. Vincent T. P. Lane M. C. Wheeler |
| author_facet | C. L. Vincent T. P. Lane M. C. Wheeler |
| author_sort | C. L. Vincent |
| collection | DOAJ |
| description | Abstract A local index for describing intraseasonal variability over the Maritime Continent is developed. The index is based on the ratio of area‐averaged rain rate over the land to that over the sea. It takes advantage of the fact that the main convective envelope of intraseasonal variability events tends to modulate the diurnal precipitation cycle over the land over the entire Maritime Continent. Lagged analysis is used to create composite intraseasonal variability events, where “day 0” is chosen according to when the normalized rain rate over the sea becomes greater than that over the land. The index identifies intraseasonal variability events associated with the Madden Julian Oscillation as well as equatorial Kelvin waves and westward propagating equatorial Rossby waves. The results suggest a similar local impact of all such events in suppressing the rain rate over land relative to that over the sea when the main convective envelope approaches. |
| format | Article |
| id | doaj-art-a62b16ea27e64d9ca314da720ab88957 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a62b16ea27e64d9ca314da720ab889572025-08-20T03:10:24ZengWileyGeophysical Research Letters0094-82761944-80072016-09-0143179306931410.1002/2016GL069987A local index of Maritime Continent intraseasonal variability based on rain rates over the land and seaC. L. Vincent0T. P. Lane1M. C. Wheeler2School of Earth Sciences The University of Melbourne Melbourne Victoria AustraliaSchool of Earth Sciences The University of Melbourne Melbourne Victoria AustraliaBureau of Meteorology Melbourne Victoria AustraliaAbstract A local index for describing intraseasonal variability over the Maritime Continent is developed. The index is based on the ratio of area‐averaged rain rate over the land to that over the sea. It takes advantage of the fact that the main convective envelope of intraseasonal variability events tends to modulate the diurnal precipitation cycle over the land over the entire Maritime Continent. Lagged analysis is used to create composite intraseasonal variability events, where “day 0” is chosen according to when the normalized rain rate over the sea becomes greater than that over the land. The index identifies intraseasonal variability events associated with the Madden Julian Oscillation as well as equatorial Kelvin waves and westward propagating equatorial Rossby waves. The results suggest a similar local impact of all such events in suppressing the rain rate over land relative to that over the sea when the main convective envelope approaches.https://doi.org/10.1002/2016GL069987tropical convectionintraseasonal variabilityMaritime Continent |
| spellingShingle | C. L. Vincent T. P. Lane M. C. Wheeler A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea Geophysical Research Letters tropical convection intraseasonal variability Maritime Continent |
| title | A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea |
| title_full | A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea |
| title_fullStr | A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea |
| title_full_unstemmed | A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea |
| title_short | A local index of Maritime Continent intraseasonal variability based on rain rates over the land and sea |
| title_sort | local index of maritime continent intraseasonal variability based on rain rates over the land and sea |
| topic | tropical convection intraseasonal variability Maritime Continent |
| url | https://doi.org/10.1002/2016GL069987 |
| work_keys_str_mv | AT clvincent alocalindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea AT tplane alocalindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea AT mcwheeler alocalindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea AT clvincent localindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea AT tplane localindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea AT mcwheeler localindexofmaritimecontinentintraseasonalvariabilitybasedonrainratesoverthelandandsea |