Thomas R. Karl
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View article: Drought shifts ozone deposition pathways in spruce forest from stomatal to non-stomatal flux
Drought shifts ozone deposition pathways in spruce forest from stomatal to non-stomatal flux Open
Dry deposition is the primary pathway for tropospheric ozone (O3) removal, with forests playing a critical role. However, environmental stressors such as drought can reduce this removal capacity by limiting stomatal O3 uptake due to stomat…
View article: Exploring the Effects of Local Air Pollution on Popliteal Artery Aneurysms
Exploring the Effects of Local Air Pollution on Popliteal Artery Aneurysms Open
Objectives: A growing body of evidence highlights the effects of air pollution on chronic and acute cardiovascular diseases, such as associations between PM10 and several cardiovascular events. However, evidence of the impact of fine air p…
View article: Reply on AC1
Reply on AC1 Open
Abstract. The COVID-19 pandemic created an extreme natural experiment in which sudden changes in human behavior and economic activity resulted in significant declines in nitrogen oxide (NOx) emissions, immediately after strict lockdowns we…
View article: Organosulfates as Tracers for Secondary Organic Aerosol (SOA) Formation from 2-Methyl-3-Buten-2-ol (MBO) in the Atmosphere
Organosulfates as Tracers for Secondary Organic Aerosol (SOA) Formation from 2-Methyl-3-Buten-2-ol (MBO) in the Atmosphere Open
2-Methyl-3-buten-2-ol (MBO) is an important biogenic volatile organic compound (BVOC) emitted by pine trees and a potential precursor of atmospheric secondary organic aerosol (SOA) in forested regions. In the present study, hydroxyl radica…
View article: Observed Climatological Relationships of Extreme Daily Precipitation Events With Precipitable Water and Vertical Velocity in the Contiguous United States
Observed Climatological Relationships of Extreme Daily Precipitation Events With Precipitable Water and Vertical Velocity in the Contiguous United States Open
An analysis of 3,104 stations in the United States shows virtually every station exhibits a positive correlation between precipitable water (PW) and extreme daily precipitation (EP) with over one‐third statistically significant. To first a…
View article: Precipitation Extremes: Trends and Relationships with Average Precipitation and Precipitable Water in the Contiguous United States
Precipitation Extremes: Trends and Relationships with Average Precipitation and Precipitable Water in the Contiguous United States Open
Trends of extreme precipitation (EP) using various combinations of average return intervals (ARIs) of 1, 2, 5, 10, and 20 years with durations of 1, 2, 5, 10, 20, and 30 days were calculated regionally across the contiguous United States. …
View article: Drought And Natural Resources Management In The United States: Impacts And Implications Of The 1987-89 Drought
Drought And Natural Resources Management In The United States: Impacts And Implications Of The 1987-89 Drought Open
The 1987-89 drought was a signal event in the evolving interrelationshipsamong climate, natural resources management, technology,and society in the United States. Over half of the country experiencedsevere to extreme drought by midsummer o…
View article: The global warming hiatus: Slowdown or redistribution?
The global warming hiatus: Slowdown or redistribution? Open
Global mean surface temperatures ( GMST ) exhibited a smaller rate of warming during 1998–2013, compared to the warming in the latter half of the 20th Century. Although, not a “true” hiatus in the strict definition of the word, this has be…
View article: Percentile indices for assessing changes in heavy precipitation events
Percentile indices for assessing changes in heavy precipitation events Open
Many climate studies assess trends and projections in heavy precipitation events using precipitation percentile (or quantile) indices. Here we investigate three different percentile indices that are commonly used. We demonstrate that these…
View article: Percentile indices for assessing changes in heavy precipitation events
Percentile indices for assessing changes in heavy precipitation events Open
Many climate studies assess trends and projections in heavy precipitation events using precipitation percentile (or quantile) indices. Here we investigate three different percentile indices that are commonly used. We demonstrate that these…