CLASP Seminar Series: Prof. Lisa Welp, of Purdue University
WHEN: October 8, 2020 3:30 pm-5:00 pm
Prof. Lisa Welp, of Purdue University will give a virtual lecture as part of the CLASP Seminar Series. Please join us!
This is a Zoom virtual event.
Zoom link: https://umich.zoom.us/j/95849940141?pwd=ZE5mUGkycTAreUpGbW9wWklFVE4zQT09
Meeting ID: 958 4994 0141
TITLE: Precipitation isotopes in the Andean Coastal Cordillera reflect the transition between Atlantic and Pacific moisture influence sub-seasonally
ABSTRACT: The western rain-shadow of the Andes mountains is an extremely arid region stretching from Peru through Chile, but is home to millions of people and associated infrastructure. While rainfall is important for water resources and supporting native vegetation, infrequent extreme rainfall events cause costly damage to human life and property. Just in the past several years, there have been extreme rain events in Northern Peru (2015 and 2017) and the Atacama Desert (2015, 2017, and 2019). This region is a transition zone between Atlantic and Pacific moisture influence driven by atmospheric circulation and coastal conditions. The conditions that produce rain in this region are still not fully understood, especially the role that Pacific sea surface temperatures play. Daily rainfall in Arequipa in southern Peru, near the arid Andean Coastal Cordillera, was analyzed for stable water isotope composition during the 2019 wet season to better understand rainfall processes. During anomalously warm coastal sea surface temperatures, Pacific influence was identified, and the isotopic values were more depleted at the 2,328 masl observation location. Improved understanding of regional moisture sources and rain events in this region can aid communities in managing critical water supplies and mitigating flood damage in the future, inform studies of coupled atmosphere-ocean-cloud feedbacks in the tropics, as well as provide insight into paleoclimate studies in this region. This presentation will also describe some of the unique natural ecological and agricultural systems in this arid region.