caa a22 4500 605471444 CHVBK 20210128100333.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00382-014-2454-4 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2454-4 Intensified impact of tropical Atlantic SST on the western North Pacific summer climate under a weakened Atlantic thermohaline circulation [Elektronische Daten] [Wei Chen, June-Yi Lee, Riyu Lu, Buwen Dong, Kyung-Ja Ha] The tropical North Atlantic (TNA) sea surface temperature (SST) has been identified as one of regulators on the boreal summer climate over the western North Pacific (WNP), in addition to SSTs in the tropical Pacific and Indian Oceans. The major physical process proposed is that the TNA warming induces a pair of cyclonic circulation anomaly over the eastern Pacific and negative precipitation anomalies over the eastern to central tropical Pacific, which in turn lead to an anticyclonic circulation anomaly over the western to central North Pacific. This study further demonstrates that the modulation of the TNA warming to the WNP summer climate anomaly tends to be intensified under background of the weakened Atlantic thermohaline circulation (THC) by using a water-hosing experiment. The results suggest that the weakened THC induces a decrease in thermocline depth over the TNA region, resulting in the enhanced sensitivity of SST variability to wind anomalies and thus intensification of the interannual variation of TNA SST. Under the weakened THC, the atmospheric responses to the TNA warming are westward shifted, enhancing the anticyclonic circulation and negative precipitation anomaly over the WNP. This study supports the recent finding that the negative phase of the Atlantic multidecadal oscillation after the late 1960s has been favourable for the strengthening of the connection between TNA SST variability and WNP summer climate and has important implications for seasonal prediction and future projection of the WNP summer climate. Springer-Verlag Berlin Heidelberg, 2014 Western North Pacific (WNP) summer climate nationallicence Tropical North Atlantic (TNA) SST nationallicence Weakened Atlantic thermohaline circulation (THC) nationallicence Atlantic multidecadal oscillation (AMO) nationallicence Chen Wei State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physic, Chinese Academy of Sciences, Beijing, China aut Lee June-Yi Research Center for Climate Sciences, Pusan National University, Busan, Korea aut Lu Riyu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physic, Chinese Academy of Sciences, Beijing, China aut Dong Buwen Department of Meteorology, National Centre for Atmospheric Science-Climate, University of Reading, Reading, UK aut Ha Kyung-Ja Research Center for Climate Sciences, Pusan National University, Busan, Korea aut Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2033-2046 0930-7575 45:7-8<2033 2015 45 382 https://doi.org/10.1007/s00382-014-2454-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2454-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Wei State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physic, Chinese Academy of Sciences, Beijing, China aut NATIONALLICENCE 700 1- Lee June-Yi Research Center for Climate Sciences, Pusan National University, Busan, Korea aut NATIONALLICENCE 700 1- Lu Riyu State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physic, Chinese Academy of Sciences, Beijing, China aut NATIONALLICENCE 700 1- Dong Buwen Department of Meteorology, National Centre for Atmospheric Science-Climate, University of Reading, Reading, UK aut NATIONALLICENCE 700 1- Ha Kyung-Ja Research Center for Climate Sciences, Pusan National University, Busan, Korea aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/7-8(2015-10-01), 2033-2046 0930-7575 45:7-8<2033 2015 45 382