How Quickly Does CO2 Influence Temperature?

Extensive research has gone into understanding the response of global temperatures to increased CO2 emissions. However, not enough quantitative studies have investigated the time it takes for this response to manifest itself. Uncertainties in these estimates are due to uncertainties in the understanding of the effects of equilibrium climate sensitivity, carbon cycling and thermal inertia of oceans, which all act to modulate the temperature response to increased greenhouse gases. A recent study published in a current issue of Env. Research Letters by Ricke and Caldeira…

"The Little Ice Age ... How Bad Was It?" Ray Bradley, UMASS

Ray Bradley is one of the foremost respected scientists today working on climate variability across a wide range of time scales. He is particularly interested in how present day climate differs from climates in the past, and what may have caused climates to change.

Bradley is a member of the RealClimate blog, and co-authored papers with Michael Mann and Malcolm Hughes that impelled Texas Represesentative Joe Barton to unsuccessfully demand full data and accounting of his research and funding.  

Joint YCEI/YIBS Climate & History Series: North American Hydroclimate Variability Over the Last Millennium

Western North America suffers epic droughts that have seriously taxed modern and ancient societies and which have also transformed landscape and ecosystems.   Climate modeling will be used to demonstrate the strong control that tropical ocean variability has over precipitation across western North America while leaving ample room for internal atmosphere variability to also contribute variability on seasonal to decadal timescales.  

Climate Change: It's the Variability, Stupid

Studies evaluating the impact of climate change have mostly focused on the effects of mean changes in climate. This approach may severely underestimate the vulnerability of human society to anthropogenic-driven climate change. This is because the biological and agricultural sectors are also affected by changes in climate variability and extreme events. A recent article by Thornton et al. (2014) reviews our current understanding on the topic and highlights significant gaps in the research. Expected changes due to climate…

Linking the Development of a Novel Paleostorm Indicator with Regional Sea-Level Rise Projections and Urban Ecological Design: An Interdisciplinary Foundation for Implementing Connecticut Coastal Resilience Plans

This project seeks to identify proxy indicators in near shore sediments that will give insight into the history of storms and sea-level rise along the Connecticut coast. Collaborators will simultaneously investigate adaptive models and associated policy changes to facilitate adaptation to future storms whose consequences are anticipated to be more severe as sea level continues to rise.

Chinese Annals and Traditional Proxies Reveal Volcanic Monsoon Influence

Volcanic eruptions are generally considered one of the best-understood (and most dramatic) causes of sudden climate changes, with large explosive eruptions capable of causing severe short-term cooling on hemispheric and global scales. This mainly occurs when eruptions inject large volumes of sulfur dioxide into the high atmosphere, where the gas oxidizes to form an aerosol particle haze that reflects incoming solar radiation to space, cooling the…

Global Warming Slows, But Only On the Surface

Global surface temperatures, which rose steadily during the end of the 20th century, have by some measures ceased to climb during the early 21st century. Since carbon dioxide emissions have certainly not decreased during this period, climate science detractors have held this as evidence that global warming is neither caused by human activities nor worth worrying about. A new study by Chen and…

Climate Impacts on Sanitation in Botswana

Worldwide, about 800 million people lack access to an improved water source. In its most basic form, an improved water supply is a well or protected spring that protects water from outside contamination. Lack of access to clean water helps explain why15% of all deaths of children under 5 worldwide are caused by diarrheal diseases. While many factors are involved, water quality and quantity…

Dendrochronology's "Divergence Problem" Explained?

A new study by Alexander Stine and Peter Huybers offers strong evidence that reduced light availability (“global dimming”) explains the apparent lack of tree-ring evidence in many Arctic regions for the recent warming observed in instrumental records there. Dendroclimatology uses measurements of the yearly growth width and density of tree rings to reconstruct changes in past climate. The …


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