Now showing items 1-10 of 39
A Lagrangian Study of Southeast Pacific Boundary Layer Clouds
Low clouds lie at the heart of climate feedback uncertainties. The representation of clouds in global climate models relies on parameterization of many sub-grid scale processes that are crucial to understanding cloud responses to climate; low clouds in particular exist as a result of tightly coupled microphysical, mesoscale, ...
Aerosol cloud interactions in southeast Pacific stratocumulus: satellite observations, in situ data and regional modeling
The influence of anthropogenic aerosols on cloud radiative properties in the persistent southeast Pacific stratocumulus deck is investigated using MODIS satellite observations, in situ data from the VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx), and WRF-Chem, a regional model with interactive chemistry ...
Biogeochemical cycling of mercury in the atmosphere-ocean-land system: Global and regional modeling
Mercury (Hg) is a ubiquitous trace metal in the environment originating from both natural and anthropogenic sources. It is a pollutant of concern because of the adverse human health effects caused by the consumption of fish and seafood containing methylmercury, which is a neurotoxin. Through development of two transport and ...
Detection and Attribution of Global Surface Air Temperature Change in the Instrumental Record
This study investigates the spatial and temporal variability of surface air temperature (SAT) in the instrumental record of climate, emphasizing the detection of SAT change in the presence of natural variability as well as the attribution of SAT variability and trends to atmospheric circulation changes, as reflected in ...
Understanding changes in the stratospheric circulation from observations and simulations
This study investigates the variation of the Brewer-Dobson circulation (BDC) in the stratosphere on interannual and decadal timescales from both observations and numerical simulations. Lower stratospheric temperature has been employed to indicate changes of the BDC over the past few decades. Based on regression analysis and ...
Assimilation of Time-averaged Pseudoproxies for Climate Reconstruction
We examine the efficacy of a novel ensemble data assimilation (DA) technique in climate field reconstructions (CFR) of surface temperature. We perform four pseudoproxy experiments with both general circulation model (GCM) and 20th Century Reanalysis (20CR) data by reconstructing surface temperature fields from a sparse network ...
Dataset to support article titled: The magnitude of the snow-sourced reactive nitrogen flux to the boundary layer in the Uintah Basin, Utah, USA
(Atmospheric Chemistry and Physics, 2016-11-09)
This data set is for a paper in the open access journal Atmospheric Chemistry and Physics. The submitted (not revised, final) version can be found at the following link: http://www.atmos-chem-phys-discuss.net/acp-2016-320/
The Energetic Constraints on the Zonal Mean Atmospheric Circulations in the Tropics, Midlatitudes, and High Latitudes
In this doctoral thesis, I have studied the processes that affect the atmospheric energy budget and their coupling relationships with atmospheric circulations. The equator-to-pole radiation gradient at the top of the atmosphere is the fundamental driver of atmospheric and oceanic circulations. Any anomaly in the energy budget ...
Estimating the Response of Mid-latitude Orographic Precipitation to Global Warming
The possible change in orographic precipitation in response to global warming is a rising concern under climate change, which could potentially cause significant societal impact. A general circulation model was employed to simulate the climate on an aquaplanet which has idealized mountains at its mid-latitudes. It was found ...
Storm-Centered Ensemble Data Assimilation for Tropical Cyclones
A significant challenge for tropical cyclone ensemble data assimilation is that storm-scale observations tend to make analyses that are more asymmetric than the prior forecasts. Compromised structure and intensity, such as an increase of amplitude across the azimuthal Fourier spectrum, are a routine property of ensemble-based ...