Collaborative Research: High resolution paleoceanography in the heart of the Equatorial Pacific Cold Tongue

东赤道太平洋(EEP)在全球气候和海洋生物地球化学中起着关键作用。利用最近从秘鲁边缘收集的一系列岩心，这项合作研究产生了该地区的综合古海洋学数据集，包括烯烃、微量元素、稳定同位素和沉积物成分。这些数据被用来记录EEP冷舌区物理、生物和地球化学性质的关键方面的横向和垂直梯度。该方法围绕三个分辨率越来越高的时间流构建：末次冰期最大(LGM)到末次冰期I、全新世和最后2000年。研究小组测试了这一假设，即EEP的古海洋学由两个不同的驱动因素决定：从末次盛冰期到全新世中期，高纬度南大洋的遥远影响，以及驱动现代厄尔尼诺-南方涛动(ENSO)系统过去5年的热带动力。更广泛的影响包括研究生和博士后培训、贫困高中生的实习以及与南美科学家的合作。

The Eastern Equatorial Pacific (EEP) plays a key role in global climate and ocean biogeochemistry. Using a recently collected series of cores from the Peruvian margin, this collaborative research generates an integrated paleoceanographic data set from this region, including alkenones, trace elements, stable isotopes, and sediment composition. These data are used to document lateral and vertical gradients in key aspects of physical, biological, and geochemical properties of the cold tongue region of the EEP. The approach is structured around three time streams of increasingly high resolution: last glacial maximum (LGM) through Termination I, the Holocene, and the last 2 millennia. The research team tests the hypothesis that the paleoceanography of the EEP has been dictated by two distinct drivers: the remote influence of the high latitude southern ocean, which dominated surface and subsurface properties from the LGM to the middle Holocene, and tropical dynamics which drove the modern El Nino-Southern Oscillation (ENSO) system over the past ~5 ky. Broader impacts include graduate and post-doctoral training, internships for disadvantaged high school students, and collaborations with South American scientists.