A5020006546- Geology and Paleoclimatology Research
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Aeolian processes and effects
- Pleistocene-Era Hominins and Archaeology
- Isotope Analysis in Ecology
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Maritime and Coastal Archaeology
- Karst Systems and Hydrogeology
- Climate variability and models
- Cryospheric studies and observations
- Archaeology and ancient environmental studies
- Oceanographic and Atmospheric Processes
- Hydraulic Fracturing and Reservoir Analysis
- Marine and coastal ecosystems
- Pacific and Southeast Asian Studies
- Tree-ring climate responses
- Marine and environmental studies
- Groundwater and Isotope Geochemistry
- Environmental and Cultural Studies in Latin America and Beyond
- Paleontology and Stratigraphy of Fossils
- Atmospheric and Environmental Gas Dynamics
- Geological and Geochemical Analysis
Massachusetts Institute of Technology
2015-2024
Planetary Science Institute
2012-2023
Moscow Institute of Thermal Technology
2020-2022
Southern California University for Professional Studies
2022
University of Southern California
2022
Lawrence Livermore National Laboratory
2022
Binghamton University
2022
ORCID
2020-2021
University of Massachusetts Amherst
2020
Columbia University
2008-2012
Abstract The authors quantify the relationship between location of intertropical convergence zone (ITCZ) and atmospheric heat transport across equator (AHTEQ) in climate models observations. observed zonal mean ITCZ varies from 5.3°S boreal winter to 7.2°N summer with an annual position 1.65°N while AHTEQ 2.1 PW northward 2.3 southward 0.1 southward. Seasonal variations are highly anticorrelated observations a suite state-of-the-art coupled regression coefficients −2.7° −2.4° PW−1...
Through study of observations and coupled climate simulations, it is argued that the mean position Inter-Tropical Convergence Zone (ITCZ) north equator a consequence northwards heat transport across by ocean circulation. Observations suggest hemispheric net radiative forcing at top atmosphere almost perfectly symmetric about equator, so total (atmosphere plus ocean) small (order 0.2 PW northwards). Due to Atlantic ocean's meridional overturning circulation, however, carries significantly...
Dust plays a critical role in Earth's climate system and serves as natural source of iron other micronutrients to remote regions the ocean. We have generated records dust deposition over past 500,000 years at three sites spanning breadth equatorial Pacific Ocean. Equatorial fluxes are highly correlated with global ice volume Antarctica, which suggests that generation interhemispheric exhibited common response change late-Pleistocene glacial cycles. Our results provide quantitative...
Abstract. Mineral dust plays an important role in the climate system by interacting with radiation, clouds, and biogeochemical cycles. In addition, natural archives show that cycle experienced variability past response to global local change. The compilation of DIRTMAP (Dust Indicators Records from Terrestrial MArine Palaeoenvironments) paleodust data sets last 2 decades provided a benchmark for paleoclimate models include cycle, following time slice approach. We propose innovative framework...
Reconstructions of past Saharan dust deposition in marine sediments provide foundational records North African climate over time scales 103 to 106 years. Previous show primarily glacial-interglacial variability the Pleistocene, contrast other monsoon showing strong precessional variability. Here, we present first record spanning multiple glacial cycles obtained using 230Th normalization, an improved method calculating fluxes. Contrary previous data, our from West margin demonstrates high...
Abstract Changing climate conditions affect dust emissions and the global cycle, which in turn affects biogeochemistry. In this study we use observationally constrained model reconstructions of cycle since Last Glacial Maximum, combined with different simplified assumptions atmospheric sea ice processing dust‐borne iron, to provide estimates soluble iron deposition oceans. For conditions, discuss uncertainties model‐based key oceanic regions, highlighting large degree uncertainty important...
Abstract 230 Th normalization is a valuable paleoceanographic tool for reconstructing high‐resolution sediment fluxes during the late Pleistocene (last ~500,000 years). As its application has expanded to ever more diverse marine environments, nuances of systematics, with regard particle type, size, lateral advective/diffusive redistribution, and other processes, have emerged. We synthesized over 1000 sedimentary records from across global ocean at two time slices, Holocene (0–5,000 years...
Wet conditions in the southwest United States during Heinrich stadials are linked to southward shifts of Pacific ITCZ.
The interannual variability of the location intertropical convergence zone (ITCZ) is strongly (R = 0.75) correlated with atmospheric heat transport across equator (AHTEQ) over satellite era (1979–2009). A 1° northward displacement ITCZ associated 0.34 PW anomalous AHTEQ from north to south. and precipitation anomalies are both an intensification climatological Hadley cell that displaced equator. This relationship suggests tropical driven by a hemispheric asymmetry energy input atmosphere at...
Variations in long-range Saharan dust transport may have amplified past Atlantic ITCZ and West African monsoon changes.