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THE CHANGES IN THE MOISTURE BUDGET DURING THE 1978-79 SOUTHERN HEMISPHERE SUMMER MONSOON

Penulis : SAUT MARULI LUBIS
Kontributor / Dosen Pembimbing :
  • Pembimbing: T. Murakami, Chairman Scanner: Irwan S.
Jenis Koleksi : Tesis
Tahun Terbit :
Penerbit :
Fakultas :
Subjek :
Kata Kunci : MOISTURE BUDGET
Sumber :
Staf Input/Edit :   Alice Diniarti
File : 1 file
Tanggal Input : 12 Nov 2004

1984 SAUT MARULI LUBIS
PUBLIC Open In Flip Book Alice Diniarti

Utilizing FGGE Level IIIb data, the moisture balance over an extensive region (30°S - 30°N, 60°E - 120°W) during the 1978-79 Southern Hemisphere summer monsoon is analyzed. In this study, the onset and the break periods are defined by the changes in the moisture budget over the northeast Australia - western South Pacific region (7.5° - 22.5°S, 135° - 165°E). The analysis shows that the major moisture source regions for the monsoon rainfall are the Indonesian Seas (0° - 12°S, 95° - 120°E) and the subtropical South Pacific off the east coast of Australia. The contribution of the Northern Hemisphere moisture flux is less than these Southern Hemisphere sources. The monsoon activity shifts eastward and southward from pre- to post-onset. During the break period, the monsoon activity shifts still further eastward and poleward. The moisture convergence pattern over Australia illustrates some of the similarities between the break conditions for the Southern Hemisphere summer monsoon and the Indian monsoon. The strong moisture convergence center over northeast Australia (about 15°S, 140°E) during the active period splits into two centers during the break period. The stronger center is situated around 20 °S, 140°E and is about 5° poleward of the previous active period position. The other center is more equatorward at around 7.5°S, 140°E. During the break period, a strong interhemispheric moisture exchange exists over the central Pacific between the dateline and 150°W. A prominent cross-equatorial moisture flux between 150°E - 1800 merges into the equatorial westerly moisture flux. This westerly moisture flux extends eastward across the dateline and becomes a strong northerly moisture flux around 150°W in the South Pacific. The northeastern Indian Ocean west of Indonesia is a key area for the moisture balance in the Indonesian region. When the moisture flux from this area reaches a maximum, the moisture convergence over the Indonesia region is also at its peak. When this flux decreases, the moisture convergence also drops.

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