TY - JOUR
T1 - Decadal oscillation of spring rain in northern Taiwan
AU - Hung, Chih Wen
AU - Hsu, Huang Hsiung
AU - Lu, Mong Ming
PY - 2004/11/28
Y1 - 2004/11/28
N2 - This study found that the spring (February-April) rainfall in northern Taiwan has fluctuated concurrently with the Pacific Decadal Oscillation (PDO) since the early 20th century. It is proposed that this fluctuation in spring rain is induced by the tropical sea surface temperature (SST) anomaly embedded in the PDO, which has been known to oscillate in opposite phase to the SST in the extra-tropical North Pacific. When the PDO index is positive (negative), the SST over the tropical Central-Eastern Pacific is warmer (colder) than normal, and a low-level anti-cyclonic (cyclonic) anomalous flow is induced over the Philippine Sea. This anomalous anti-cyclonic (cyclonic) flow results in southwesterly (northeasterly) anomalous winds to the east of Taiwan and enhances (reduces) the trough extending southwestward from southern Japan to northern Taiwan. As a consequence, more (less) spring rain occurs in northern Taiwan during the positive (negative) PDO phases.
AB - This study found that the spring (February-April) rainfall in northern Taiwan has fluctuated concurrently with the Pacific Decadal Oscillation (PDO) since the early 20th century. It is proposed that this fluctuation in spring rain is induced by the tropical sea surface temperature (SST) anomaly embedded in the PDO, which has been known to oscillate in opposite phase to the SST in the extra-tropical North Pacific. When the PDO index is positive (negative), the SST over the tropical Central-Eastern Pacific is warmer (colder) than normal, and a low-level anti-cyclonic (cyclonic) anomalous flow is induced over the Philippine Sea. This anomalous anti-cyclonic (cyclonic) flow results in southwesterly (northeasterly) anomalous winds to the east of Taiwan and enhances (reduces) the trough extending southwestward from southern Japan to northern Taiwan. As a consequence, more (less) spring rain occurs in northern Taiwan during the positive (negative) PDO phases.
KW - 3309 Meteorology and Atmospheric Dynamics: Climatology (1620)
KW - 3339 Meteorology and Atmospheric Dynamics: Ocean/atmosphere interactions (0312, 4504)
KW - 3354 Meteorology and Atmospheric Dynamics: Precipitation (1854)
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U2 - 10.1029/2004GL021344
DO - 10.1029/2004GL021344
M3 - Article
AN - SCOPUS:14044269319
SN - 0094-8276
VL - 31
SP - 1
EP - 4
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 22
ER -