Deborah Khider

Deborah Khider
University of Southern California | USC · Department of Earth Sciences

PhD

About

30
Publications
8,107
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418
Citations
Introduction
Additional affiliations
January 2016 - January 2017
University of Southern California
Position
  • PostDoc Position

Publications

Publications (30)
Article
Full-text available
Studying past climate variability is fundamental to our understanding of current changes. In the era of Big Data, the value of paleoclimate information critically depends on our ability to analyze large volume of data, which itself hinges on standardization. Standardization also ensures that these datasets are more Findable, Accessible, Interoperab...
Article
Major societal and environmental challenges involve complex systems that have diverse multi-scale interacting processes. Consider, for example, how droughts and water reserves affect crop production and how agriculture and industrial needs affect water quality and availability. Preventive measures, such as delaying planting dates and adopting new a...
Article
Full-text available
Chronological uncertainty is a hallmark of the paleoenvironmental sciences and geosciences. While many tools have been made available to researchers to quantify age uncertainties suitable for various settings and assumptions, disparate tools and output formats often discourage integrative approaches. In addition, associated tasks like propagating a...
Preprint
Full-text available
Chronological uncertainty is a hallmark of the paleosciences. While many tools have been made available to researchers to quantify age uncertainties suitable for various settings and assumptions, disparate tools and output formats often discourage integrative approaches. In addition, associated tasks like propagating age model uncertainties to subs...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
A comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series co...
Poster
Understanding the impacts of climate change on natural and human systems poses major challenges as it requires the integration of models and data across various disciplines, including hydrology, agriculture, ecosystem modeling, and econometrics. While tactical situations arising from an extreme weather event require rapid responses, integrating the...
Article
Full-text available
The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of community-sanctioned data standards in paleoclimatology has largely precluded the benefits of Big Da...
Technical Report
This document proposes an overarching modeling problem framework and definitions for terms used in the World Modelers program in TA2-TA3 modeling, also called bottom-up modeling. There are several reasons to propose a shared conceptual framework and terminology. First, there is a high degree of ambiguity in the use of terms such as "scenario", "mod...
Article
Full-text available
Climate records exhibit scaling behavior with large exponents, resulting in larger fluctuations at longer timescales. It is unclear whether climate models are capable of simulating these fluctuations, which draws into question their ability to simulate such variability in the coming decades and centuries. Using the latest simulations and data synth...
Conference Paper
Understanding the interactions between natural processes and human activities poses major challenges as it requires the integration of models and data across disparate disciplines. It typically takes many months and even years to create valid end-to-end simulations as different models need to be configured in consistent ways and generate data that...
Article
Full-text available
We present a detailed analysis of the seasonal distribution, size, morphological variability, and geochemistry of co-occurring pink and white chromotypes of Globigerinoides ruber from a high-resolution (1–2 weeks) and long-running sediment trap time series in the northern Gulf of Mexico. We find no difference in the seasonal flux of the two chromot...
Conference Paper
Model repositories are key resources for scientists in terms of model discovery and reuse, but do not focus on important tasks such as model comparison and composition. Model repositories do not typically capture important comparative metadata to describe assumptions and model variables that enable a scientist to discern which models would be bette...
Article
Full-text available
Understanding the mechanisms behind any changes in the climate system often requires establishing the timing of events imprinted on the geological record. However, these proxy records are prone to large uncertainties, which may preclude meaningful conclusions about the relative timing of events. In this study, we put forth a framework to estimate t...
Conference Paper
Full-text available
Traditional approaches to ontology development have a large lapse between the time when a user using the ontology has found a need to extend it and the time when it does get extended. For scientists, this delay can be weeks or months and can be a significant barrier for adoption. We present a new approach to ontology development and data annotation...
Article
Full-text available
We present a 5-Myr probabilistic stack, which we name the Prob-stack. It is constructed from 180 globally distributed benthic δ¹⁸O records using a profile hidden Markov model (HMM). Benthic stacks have been extensively employed to estimate ages in marine sediment cores and lead-lag relationships between paleoclimate proxies. Because this stack is p...
Article
Oxygen minimum zones (OMZs), located below highly productive marine regions, are sites of microbially-mediated denitrification and biogeochemical cycling that have global significance. The intensity of OMZs fluctuate naturally, however, the degree of these fluctuations and a comprehensive understanding of the factors that drive these fluctuations o...
Article
Full-text available
The use of Mg/Ca in marine carbonates as a paleothermometer has been challenged by observations that implicate salinity as a contributing influence on Mg incorporation into biotic calcite and that dissolution at the sea-floor alters the original Mg/Ca. Yet, these factors have not yet been incorporated into a single calibration model. We introduce a...
Article
Full-text available
The assessment of age uncertainty in stratigraphically aligned records is a pressing need in paleoceanographic research. The alignment of ocean sediment cores is used to develop mutually consistent age models for climate proxies and is often based on the δ18O of calcite from benthic foraminifera, which records a global ice volume and deep water tem...
Article
Full-text available
[1] We investigate the relationship between tropical Pacific and Southern Ocean variability during the Holocene using the stable oxygen isotope and magnesium/calcium records of co-occurring planktonic and benthic foraminifera from a marine sediment core collected in the western equatorial Pacific. The planktonic record exhibits millennial-scale sea...
Article
The millennial climate changes referred to as the Medieval Climate Anomaly/Little Ice Age (MCA/LIA) have been attributed to varying solar insolation and volcanism that affected Earth's radiation balance. It remains unclear whether ocean heat transport contributed to the MCA/LIA climate variability. The marine sediment core MD98-2181 from the edge o...
Article
Full-text available
We present a reconstruction of El Nio Southern Oscillation (ENSO) variability spanning the Medieval Climate Anomaly (MCA, A.D. 800-1300) and the Little Ice Age (LIA, A.D. 1500-1850). Changes in ENSO are estimated by comparing the spread and symmetry of δ18O values of individual specimens of the thermocline-dwelling planktonic foraminifer Pulleniati...
Data
We present a reconstruction of El Niño Southern Oscillation (ENSO) variability spanning the Medieval Climate Anomaly (MCA, A.D. 800-1300) and the Little Ice Age (LIA, A.D. 1500-1850). Changes in ENSO are estimated by comparing the spread and symmetry of d18O values of individual specimens of the thermocline-dwelling planktonic foraminifer Pulleniat...
Article
Full-text available
We present a reconstruction of El Niño Southern Oscillation (ENSO) variability for the last millennium using stable oxygen and carbon isotope data obtained by analyzing samples from a marine sediment core (core MD98-2177) collected in the Indonesian Seas, at the edge the western Pacific warm pool. At this location the delta18O of calcite produced b...
Article
The thermocline of the Makassar Strait within the Indo-Pacific Warm Pool is strongly influenced by the El Niño-Southern Oscillation (ENSO) and, to a lesser extent, by seasonal wind reversals associated with the monsoon cycle. The thermocline temperature and salinity changes associated with this variability are accompanied by changes in the producti...

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