Andrea K. Kern

Andrea K. Kern
Duke University | DU · Nicholas School of the Environment

PhD

About

43
Publications
17,683
Reads
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645
Citations
Introduction
My main scientific interests are paleoclimate and paleoenvironmental reconstructions with a focus on vegetation dynamics, biodiversity and biome reconstructions. Currently, I study mainly Quaternary and Neogene deposits across the South American tropics.
Additional affiliations
June 2014 - present
University of São Paulo
Position
  • PostDoc Position
Description
  • Vegetation and climate reconstructions of the Neogene Central Amazon
July 2012 - April 2014
State Museum of Natural History Stuttgart
Position
  • Varved sequences from a Early/Middle Miocene maar lake (Randeck Maar)
Description
  • - describing high-resolution vegetation changes - detecting solar cycles on Middle Miocene maar sediments - discussing seasonality at the Middle Miocene Climatic Optimum
March 2009 - June 2012
Naturhistorisches Museum Wien
Position
  • Millennial- to centennial-scale vegetation dynamics and surface water productivity during the Late Miocene in and around Lake Pannon”
Description
  • Questions -Which time resolution for environmental variations can be achieved? -How do different environments change? -Can a common trigger be identified? Link to climate change? -Are there repetitive patterns present (sub-Milankovitch cycles)?
Education
February 2009 - July 2012
Karl-Franzens-Universität Graz
Field of study
  • Earth Science - Geobiology and Palecology
October 2003 - February 2009
University of Vienna
Field of study
  • Biology - Paleobiology

Publications

Publications (43)
Article
The modern Amazonian rainforest has a great fascination and global significance, but our knowledge of past landscape changes is still limited due to sparse data and the lack of radiometric age constrains. Precise dating in records older than the late Pleistocene are difficult to obtain and often regionally confined, therefore biostratigraphic corre...
Article
Full-text available
Uplift of the Andean Cordillera during the Miocene and Pliocene produced large-scale changes in regional atmospheric circulation that impacted local ecosystems. The Lauca Basin (northern Chilean Altiplano) contains variably fluvial and lacustrine sedimentary sequences spanning the interval from 8.7 to 2.3 Ma. Field samples were collected from paleo...
Article
In the Amazonian lowlands, the shift from a large wetland dominated by flooded forests (Varzea) to the modern incised valleys bounded by extensive areas of non-flooded forests (Terra Firme) is considered a key driver of the Amazonian mega-biodiversity. Dating the sedimentary beds covered by Terra Firme forest is crucial to constrain the timing of s...
Article
Paleoenvironmental reconstructions based on Amazonian fluvial and marine pollen data are often hindered due to the scarcity of modern calibration data. In Amazonia, rivers are the main pathways for pollen from upland and flooded forests to continental and marine sediment sinks. Linking pollen assemblages transported by rivers to watershed vegetatio...
Article
Paleofluvial dynamics is crucial to understand the role of rivers as biogeographic boundaries in Amazonia during the Cenozoic, period when the Amazonian biome and drainage system were assembled. In central Amazonia, fluvial deposits of the Alter do Chão, Iranduba and Novo Remanso Formations host supergene iron oxides and record changes in the distr...
Article
Planktonic foraminifera are an important biochronostratigraphic tool and one of the main proxies used in paleoceanographic studies. Here we present the integration of quantitative analyses of planktonic foraminifera biostratigraphy, planktonic and benthic foraminifera oxygen isotopic data, and planktonic foraminifera radiocarbon ages in a biochrono...
Chapter
Evidence from various climate proxies provides us with increasingly reliable proof that only in the past 10 millennia were natural systems more or less as we see them at the present (without considering human impact). Prior to 10,000 years ago, natural systems repeatedly changed under the influence of an unstable climate. This is particularly true...
Article
Full-text available
Brown coal deposits of the Lower Rhine Basin, northwest Germany, cover the late Burdigalian to Serravallian and most of the Tortonian enabling access to observations of vegetation dynamics during the Miocene Climatic Optimum and Late Miocene Cooling. Based on a total of 500 microfloras sampled from brown coal seams in the Bergheim and Inden open ca...
Article
Full-text available
Sarmatian and Pannonian cores, drilled at the western margin of the Vienna Basin in the City of Vienna, reveal a complex succession of marine and lacustrine depositional environments during the middle to late Miocene transition. Two Sarma-tian and two Pannonian transgressive-regressive sequences were studied in detail. Identical successions of bent...
Conference Paper
Reconstructing the history of the Amazonian lowlands is hampered by the scarcity and quality of long sedimentary sequences. Outcrops are mainly exposed along river cuts or alongside the westernmost edge of the Amazonian basins, where they are uplifted and cut-in by present-day rivers. This has led to paleogeographical and paleoenvironmental reconst...
Article
Today, NE China is highly affected by cold and dry winter monsoon winds, causing long and severe winters with monthly mean temperatures below−10 °C. Yet, the Neogene paleoclimatic history of this region is not well understood due to the lack of precisely dated paleontological localities. Herein,we present several Ar–Ar basalt ages round a plant-bea...
Article
Full-text available
This article presents the scientific rationale for an ambitious ICDP drilling project to continuously sample Late Cretaceous to modern sediment in four different sedimentary basins that transect the equatorial Amazon of Brazil, from the Andean foreland to the Atlantic Ocean. The goals of this project are to document the evolution of plant biodivers...
Article
The lower Maeotian sedimentary rocks of the Popov Kamen section (Russia, Taman Region, Eastern Paratethys) were investigated by cyclostratigraphy methods based on magnetic susceptibility measurements. Time series analysis (Lomb-Scargle and REDFIT periodograms, wavelets, Gaussian filters) revealed statistically significant signal at 5.2–6 m correspo...
Article
In order to reassess and amend previously published palynological data drawn from the Novo Remanso Formation, central Ama-zonia, we revisited the organic-rich samples from their work using systematic and quantitative biostratigraphic analyses, with possible implications in the biodiversity and paleoecological studies of Late Neogene deposits of Ama...
Article
Full-text available
The Randeck Maar in S Germany is a well-known fossil lagerstätte with exceptionally preserved fossils, particularly insects and plants, which thrived in and around the maar lake during the Mid-Miocene Climatic Optimum (late Early/early Middle Miocene, mammal zone MN5). We provide the first critical and detailed overview of the fauna and flora with...
Article
The late early to middle Miocene sediments at Varkala cliff section (SW India) offer a great potential to study paleoenvironmental and paleoclimatic conditions. The succession consists of coastal marine sands alternating with fine grained, organic-rich siliciclastics. Based on several palyno-samples, a mangrove flora could be reconstructed, compose...
Article
Full-text available
Human induced range expansions of invasive dreissenid bivalves are of great concern. However, the underlying biological processes are only poorly understood, partly due to the lack of information on natural expansion events. Here we use the extinct bivalve species Sinucongeria primiformis as a model organism for testing natural (i.e. pre-Anthropoce...
Article
Full-text available
Human induced range expansions of invasive dreissenid bivalves are of great concern. However, the underlying biological processes are only poorly understood, partly due to the lack of information on natural expansion events. Here we use the extinct bivalve species Sinucongeria primiformis as a model organism for testing natural (i.e. non-Anthropoce...
Article
Full-text available
Precipitation over India is driven by the Indian monsoon. Although changes in this atmospheric circulation are caused by the differential seasonal diabatic heating of Asia and the Indo-Pacific Ocean, it is so far unknown how global warming influences the monsoon rainfalls regionally. Herein, we present a Miocene pollen flora as the first direct proxy f...
Article
Full-text available
A high-resolution multi-proxy analysis was conducted on a 1.5-m-long core of Tortonian age (~ 10.5 Ma; Late Miocene) from Austria (Europe). The lake sediments were studied with a 1-cm resolution to detect all small-scale variations based on palynomorphs (pollen and dinoflagellate cysts), ostracod abundance, geochemistry (carbon and sulfur) and geop...
Data
The table shows a detailed list of plant taxa used to the Coexistence Approach climatic reconstruction. For each taxon, the nearest living relative is given; further a reason for each plants excluded from the analysis is mentioned.
Data
The table contains all measured and counted data according to sample numbers. Additionally to an overview of all proxies, special sheets of all pollen and dinoflagellate cysts counts is provided.
Article
Full-text available
The Late Miocene paleogeography of central Europe and its climatic history are well studied with a resolution of c. 106 years. Small-scale climatic variations are yet unresolved. Observing past climatic change of short periods, however, would encourage the understanding of the modern climatic system. Therefore, past climate archives require a resol...
Article
The Asian monsoon is an integral component of the global climate system. This large-scale atmospheric circulation comprises the East Asian summer and winter monsoon and the Indian monsoon subsystems, all characterized by seasonal reversing winds and precipitation changes associated with asymmetric heating of land and sea. The Neogene monsoon histor...
Data
Data sheet with a list of selected dinoflagellates and pollen taxa in percentages (occurring with more than 1% at least in one sample) used for statistical analysis.
Data
Detailed climatic values of the coexistence intervals are shown next to the total taxa number of taxa included in each estimate, the total number in general and a list of excluded plants for each of the intervals.
Article
Full-text available
Herein the organic-walled dinoflagellate cyst Mendicodinium mataschenensis is introduced as a new species. The taxon derives from lower Tortonian clays from the clay pit Mataschen in Styria, Austria. These deposits formed in Lake Pannon, which was characterized throughout the Late Miocene by its highly endemic and rapidly evolving biota. As most sp...
Article
Pollen analyses have been proven to possess the possibility to decipher rapid vegetational and climate shifts in Neogene sedimentary records. Herein, a c. 21-kyr-long transgression-regression cycle from the Lower Austrian locality Stetten is analysed in detail to evaluate climatic benchmarks for the early phase of the Middle Miocene Climate Optimum...
Article
Full-text available
The aragonite shells of 55 mollusc specimens from the late Early and early Middle Miocene of two palaeolakes of the Dinaride Lake System (DLS) are analysed for their δ18O and δ13C signatures. The data set has a bimodal distribution with a prominent peak between −3 and −4‰ for both isotopes and a second much weaker peak at more depleted values of c....
Data
Pollen analyses have been proven to possess the possibility to decipher rapid vegetational and climate shifts in Neogene sedimentary records. Herein, a c. 21-kyr-long transgression-regression cycle from the Lower Austrian locality Stetten is analysed in detail to evaluate climatic benchmarks for the early phase of the Middle Miocene Climate Optimum...
Article
Full-text available
The aim of the paper is to present a thorough documentation of the palynoflora of a small part of the Lukundol Formation from the Kathmandu Basin in Nepal. The comparison of light microscope pictures with the scanning electron microscope pictures of the identical specimens allows a better understanding of the taxa present in the latest Early or Mid...
Article
Full-text available
The Korneuburg Basin (Lower Austria) is a ca. 20 km long and at most 7 km wide asymmetric pull-apart basin formed within the Alpine-Carpathian thrustbelt during last Alpine movements in the Karpatian (late Early Miocene). During the construction of the S1 motorway a ca. 1.8 km long section between the Tradenberg tunnel and the city of Korneuburg wa...
Article
A detailed ultra-high-resolution analysis of a 37-cm-long core of Upper Miocene lake sediments of the long-lived Lake Pannon has been performed. Despite a general stable climate at c. 11-9 Ma, several high-frequency oscillations of the paleoenvironments and depositional environments are revealed by the analysis over a short time span of less than 1...

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Projects (2)
Project
Dynamic loads from roads, tunnels and rails are fatal loads for the stability of any nearby structure, and therefore; In this project; We submit a methodology for using geotechnical factors to enhance the stability of buildings by controlling the geometric factors of water movement, soil mechanics and wind speed.
Project
NECLIME is an open international network of scientists working on Cenozoic climate evolution and related changes of continental ecosystems. During the past 65 million years of Earth history, globally warmer-then-present conditions prevailed in a world with almost modern paleogeography. These timespans represent promising case studies for anticipated future scenarios. Within the NECLIME network, we aim to combine data on past climate change and its environmental impact for large-scale reconstructions. NECLIME research activities comprise paleoclimate reconstructions, including atmospheric CO₂ and ecosystem analysis using multiple quantitative methods on various primarily continental proxies (plants; vertebrates; invertebrates; geochemistry and geological proxies). Complementing model studies are employed to assess connections and processes driving ocean, atmosphere and biosphere at global and regional scales. NECLIME was established in 1999 with the aim to understand Neogene trends across Eurasia. This basic idea quickly and constantly expanded to a global interest and a wider stratigaphical frame. The steadily growing NECLIME network with currently around 140 members in 34 countries is coordinated by a team of researchers and an advisory board. NECLIME holds annual conferences and workshops and administers working groups bringing forward scientific exchange, joint projects, and the integration of research data. For more information go to www.neclime.de