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

东赤道太平洋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，这项合作研究生成了该地区的综合古海洋学数据集，包括烯酮、微量元素、稳定同位素和沉积物组成。这些数据用于记录EEP冷舌区物理、生物和地球化学特征关键方面的横向和垂直梯度。该方法是围绕三个分辨率越来越高的时间流构建的：末次极大期（LGM）到终止期I，全新世和最近2000年。研究小组验证了一个假设，即EEP的古海洋学是由两个不同的驱动因素决定的：高纬度南大洋的远程影响，从LGM到全新世中期，南大洋的表面和地下特性占主导地位；以及在过去5天左右驱动现代厄尔尼诺-南方涛动（ENSO）系统的热带动力学。更广泛的影响包括研究生和博士后培训，为弱势高中生提供实习机会，以及与南美科学家合作。

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.