(Table 1) Age determination of ODP Site 145-883

Foraminifera-based sea surface temperature estimates in the northwest Pacific (Ocean Drilling Program Site 883; 51°N) varied by 4°C on millennial timescales over the last 60,000 calendar (cal) years, with the most prominent amplitudes during marine isotope stage 3. Age control is based on benthic d18O records, 14C ages, and on geomagnetic intensity variations at Site 883 tuned to the North Atlantic paleointensity stack since 75 ka (NAPIS-75), in turn, tied to the Greenland Ice Sheet Project 2 (GISP2) ice core chronology. On the basis of this tuning, northwest Pacific warm phases parallel Greenland cold stadials and viceversa. This contrasts with atmospheric heat transfer, expected to produce quasi-coeval signals across the Northern Hemisphere. The antiphasing may instead stem from variations in global thermohaline circulation. At its North Pacific terminus in the subarctic gyre, any slowdown or shutoff of North Atlantic Deep Water formation during Dansgaard-Oeschger stadials led to a turnoff or reduction of the upwelling of cold Pacific deepwater and thus, to striking, instantaneous, short-term warmings of surface water.基于有孔虫（Foraminifera）的西北太平洋（大洋钻探计划（Ocean Drilling Program）883站位；北纬51°）海水表层温度估算结果显示，过去6万年日历（cal）年以来，该区域的温度在千年尺度上波动幅度达4℃，其中波动幅度最显著的时期为海洋同位素3期（Marine Isotope Stage 3）。该数据集的定年控制基于底栖d18O记录、14C测年结果，以及883站位的地磁强度变化数据；这些数据被调谐至75 ka以来的北大西洋古地磁强度堆叠序列（NAPIS-75），而该序列又绑定于格陵兰冰芯计划2（GISP2）的冰芯年代框架。基于该调谐方案，西北太平洋的暖期与格陵兰的寒冷冰阶同步对应，反之亦然。这与预期的大气热传输效应相悖——后者本应在北半球产生准同期的温度信号。这种反相位现象或源于全球温盐环流的变化。在北太平洋亚北极环流圈的末端区域，当丹斯果-奥施格尔（Dansgaard-Oeschger）冰阶期间北大西洋深层水形成出现减缓或中断时，会导致太平洋深层冷水的上涌减弱或停止，进而引发表层海水出现显著、瞬时的短期升温。