TY - JOUR
T1 - Tropical Atlantic-Korea teleconnection pattern during boreal summer season
AU - Ham, Yoo Geun
AU - Chikamoto, Yoshimitsu
AU - Kug, Jong Seong
AU - Kimoto, Masahide
AU - Mochizuki, Takashi
N1 - Funding Information:
This work is supported by the Korean Meteorological Administration Research and Development Program under Grant KMIPA2015-6170. The partial assimilation experiments were performed with the support of the Japanese Ministry of Education, Culture, Sports, Science and Technology, through the Program for Risk Information on Climate Change. Y.C. was supported through NSF Award No. 1049219.
Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - The remote impact of tropical Atlantic sea surface temperature (SST) variability on Korean summer precipitation is examined based on observational data analysis along with the idealized and hindcast model experiments. Observations show a significant correlation (i.e. 0.64) between Korean precipitation anomalies (averaged over 120–130°E, 35–40°N) and the tropical Atlantic SST index (averaged over 60°W–20°E, 30°S–30°N) during the June–July–August (JJA) season for the 1979–2010 period. Our observational analysis and partial-data assimilation experiments using the coupled general circulation model demonstrate that tropical Atlantic SST warming induces the equatorial low-level easterly over the western Pacific through a reorganization of the global Walker Circulation, causing a decreased precipitation over the off-equatorial western Pacific. As a Gill-type response to this diabatic forcing, an anomalous low-level anticyclonic circulation appears over the Philippine Sea, which transports wet air from the tropics to East Asia through low-level southerly, resulting an enhanced precipitation in the Korean peninsula. Multi-model hindcast experiments also show that predictive skills of Korean summer precipitation are improved by utilizing predictions of tropical Atlantic SST anomalies as a predictor for Korean precipitation anomalies.
AB - The remote impact of tropical Atlantic sea surface temperature (SST) variability on Korean summer precipitation is examined based on observational data analysis along with the idealized and hindcast model experiments. Observations show a significant correlation (i.e. 0.64) between Korean precipitation anomalies (averaged over 120–130°E, 35–40°N) and the tropical Atlantic SST index (averaged over 60°W–20°E, 30°S–30°N) during the June–July–August (JJA) season for the 1979–2010 period. Our observational analysis and partial-data assimilation experiments using the coupled general circulation model demonstrate that tropical Atlantic SST warming induces the equatorial low-level easterly over the western Pacific through a reorganization of the global Walker Circulation, causing a decreased precipitation over the off-equatorial western Pacific. As a Gill-type response to this diabatic forcing, an anomalous low-level anticyclonic circulation appears over the Philippine Sea, which transports wet air from the tropics to East Asia through low-level southerly, resulting an enhanced precipitation in the Korean peninsula. Multi-model hindcast experiments also show that predictive skills of Korean summer precipitation are improved by utilizing predictions of tropical Atlantic SST anomalies as a predictor for Korean precipitation anomalies.
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U2 - 10.1007/s00382-016-3474-z
DO - 10.1007/s00382-016-3474-z
M3 - Article
AN - SCOPUS:85003944876
SN - 0930-7575
VL - 49
SP - 2649
EP - 2664
JO - Climate Dynamics
JF - Climate Dynamics
IS - 7-8
ER -