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Defenses Spring 2017

Fall 2016 | Fall 2017

The Dynamics of Hadley Circulation Variability and Change

Nicholas Davis
June 23, 2017

The Hadley circulation exerts a dominant control on the surface climate of earth's tropical belt. Its converging surface winds fuel the tropical rains, while subsidence in the subtropics dries and stabilizes the atmosphere, creating dese...

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SKILLFUL LONG-RANGE FORECASTS OF NORTH AMERICAN HEAT WAVES FROM PACIFIC STORM PROPAGATION

Andrea Jenney
June 22, 2017

Extreme heat poses major threats to public health and the economy. Long-range predictions of heat waves offer little improvement over climatology despite the continuing improvements of weather forecast models. Previous studies have hinte...

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IMPACTS OF UNCONVENTIONAL OIL AND GAS DEVELOPMENT ON ATMOSPHERIC AEROSOL PARTICLES

Ashley Evanoski-Cole
June 13, 2017

Rising demands for global energy production and shifts in the economics of fossil fuel production have recently driven rapid increases in unconventional oil and gas drilling operations in the United States. Limited field measurements of...

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Climatology and Variability of Atmospheric Rivers over the North Pacific

Bryan Mundhenk
June 9, 2017

Atmospheric rivers (ARs) are plumes of intense water vapor transport that dominate the flux of water vapor into and within the extratropics. Upon landfall, ARs are a major source of precipitation and often trigger weather and/or hydrolo...

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COLD-SEASON TORNADOES: CLIMATOLOGICAL, METEORLOGICAL, and SOCIAL PERSPECTIVES

Samuel Childs
June 1, 2017

Tornadoes that occur during the cold season, defined here as November – February (NDJF), pose many unique societal risks. For example, people can be caught off-guard because in general one does not expect severe weather and tornadoes...

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EXPLORING THE LIMITS OF VARIATIONAL PASSIVE MICROWAVE RETRIEVALS

David Duncan
May 30, 2017

Passive microwave observations from satellite platforms constitute one of the most important data records of the global observing system. Operational since the late 1970s, passive microwave data underpin climate records of precipitation,...

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Madden-Julian Oscillation teleconnections and their influence on Northern Hemisphere winter blocking

Stephanie Henderson
March 22, 2017

Winter blocking events are characterized by persistent and quasi-stationary patterns that re-direct precipitation and air masses, leading to long-lasting extreme winter weather. Studies have shown that the teleconnection patterns forced...

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Reconciling TRMM Precipitation Estimates to El Niño Southern Oscillation Variability

David Henderson
March 9, 2017

Over the tropical oceans, large discrepancies in TRMM passive and active microwave rainfall retrievals become apparent during El Niño-Southern Oscillation (ENSO) events, where TMI retrievals exhibit a systematic shift in precipitation s...

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Transport-Radiation Feedbacks of Ozone in the Tropical Tropopause Layer

Ed Charlesworth
February 14, 2017

The tropical tropopause layer (TTL) is a region in the atmosphere that shows an interesting combination of tropospheric and stratospheric characteristics over the extent of several kilometers. For example, the TTL shows both convectively...

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