Paul Knapp
Biographic Data
| ID | 3998421 |
|---|---|
| NAME | Paul Knapp |
| GIVEN NAMES | Paul |
| FAMILY NAME | Knapp |
| SIGNATURE | KNAPP P |
| AFFILIATIONS | University of North Carolina at Greensboro |
| ORCID | 0000-0002-0783-7933 |
| VERIFIED | Yes |
| TOTAL WORKS | 11 |
| TOTAL CITATIONS | 9 |
| WORKS AS AUTHOR | 11 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1991 |
| LATEST PUBLICATION YEAR | 2023 |
| H-INDEX | 2 |
Global Patterns of Antioxidant-Rich Food Crops Based on Geographical Origins
We mapped antioxidant values of 118 common food crops at a global scale based on geographical origins using median oxygen radical absorbance capacity (ORAC) and total phenolics (TP) for twenty-three regions to evaluate broad-scale patterns. Using the U.S. Department of Agriculture Food Composition Database we used k-means clustering to differentiate regions based on ORAC and TP values. Latitude is positively associated with ORAC (rs = 0.51, p < 0…
Microelevational Differences Affect Longleaf Pine (Pinus palustris Mill.) Sensitivity to Tropical Cyclone Precipitation
Latewood ring widths of longleaf pine (Pinus palustris Mill.) growing on Carolina bay sand rims on the coastal plains of North Carolina are effective recorders of tropical cycone precipitation (TCP). Longleaf pine are hypothesized to be effective recorders of TCP because of their extensive lateral root structure that is exposed to enhanced soil moisture when TCP events raise the water table to root level, but this hypothesis has not been empirica…
The importance of infrequent, high-intensity rainfall events for longleaf pine (Pinus palustris Mill.) radial growth and implications for dendroclimatic research
Tree-ring based precipitation reconstructions are beneficial in placing interannual variability in an historical context. However, absent specificity on what is being modeled (e.g., event type or rainfall intensity), similar rainfall totals inferred from reconstructions between different years imply similar conditions. Consequently, variability in specific precipitation event types or intensity can affect radial growth widths despite no changes i…
Climate-Growth Responses From Pinus Ponderosa Trees Using Multiple Measures of Annual Radial Growth
When using old-growth trees from semiarid, open-canopy environments, basal area increment (BAI), an absolute measure of radial growth, is sometimes used instead of the more commonly used ‘conservative techniques’ (negative exponential or linear regression with a negative slope; NegX) because narrow rings have been shown to potentially bias results. In this study we explore the relationship between radial growth of ponderosa pine from four study s…
Spatiotemporal Changes in Comfortable Weather Duration in the Continental United States and Implications for Human Wellness
We examined the spatial distribution of monthly, seasonal, and annual changes in comfortable weather hours (CWHs) between 1950 and 2011 and explored the relationship between human wellness and the amount and timing of CWHs. Using a thermohygrometric index based on air temperature and dewpoint temperature recorded every three hours from thirty-five U.S. cities, we determined whether changes in human thermal comfort were coincident with warming and…
Drought-Busting Tropical Cyclones in the Southeastern Atlantic United States
Droughts and tropical cyclones (TCs) are climatologically common events in the southeastern United States, yet little research has examined the potential for TCs to ameliorate drought impacts. Here, we identify the frequency of TCs that abruptly end drought conditions (i.e., drought busters, or DB) and determine possible influences of coupled ocean–atmosphere teleconnections on the likelihood of a TC-induced DB (TCDB). Using the HURDAT database a…
Lewis and Clarks’ Tempest
Three weeks after arriving near the Pacific Northwest (PNW) coast in November 1805, Lewis and Clarks’ Corps of Discovery experienced a two-day windstorm that may have rivaled the strongest historically documented storms of the nineteenth and twentieth centuries. Based on the Corps’ detailed historical accounts describing the event as the perfect storm, we characterized the severity of the 1805 windstorm using tree-ring growth anomalies from winds…
Climatic Regionalization and the Spatio-Temporal Occurrence of Extreme Single-Year Drought Events (1500–1998) in the Interior Pacific Northwest, USA
Tree-ring records from western juniper ( Juniperus occidentalis var. occidentalis Hook.) growing throughout the interior Pacific Northwest identify extreme climatic pointer years (CPYs) (i.e., severe single-year droughts) from 1500–1998. Widespread and extreme CPYs were concentrated in the 16th and early part of the 17th centuries and did not occur again until the early 20th century. The 217-yr absence of extreme CPYs may have occurred during an …
Vegetation Change and the Role of Atmospheric CO 2 Enrichment on a Relict Site in Central Oregon
Atmospheric CO2 enrichment is incresingly implicated as a contributory cause of vegetation change on North American rangelands. To explore the role of the rising CO2 content of the earth's atmosphere as an agent of vegetation change, we revisited (June 1994) the Island Research Natural Area (IRNA), a relict site of semiarid vegetation in central Oregon, to conduct a replicate survey of Driscoll's (1962) 1960 work. IRNA is one of the best non-labo…
Cheatgrass (Bromus tectorum L) dominance in the Great Basin Desert
Mammography in a health maintenance organization
The charts of a random sample of 496 women, aged 51 and older, in a staff model health maintenance organization (HMO) were retrospectively audited for mammography frequency over an 8-year period. Of the 496 women, 306 (61.7%) had at least one mammogram. For the 422 women who had been members of the HMO for at least 2 years, 196 (46.4%) had mammography within the previous 18 months
Cheatgrass (Bromus tectorum L) dominance in the Great Basin Desert
Drought-Busting Tropical Cyclones in the Southeastern Atlantic United States
Droughts and tropical cyclones (TCs) are climatologically common events in the southeastern United States, yet little research has examined the potential for TCs to ameliorate drought impacts. Here, we identify the frequency of TCs that abruptly end drought conditions (i.e., drought busters, or DB) and determine possible influences of coupled ocean–atmosphere teleconnections on the likelihood of a TC-induced DB (TCDB). Using the HURDAT database a…
Lewis and Clarks’ Tempest
Three weeks after arriving near the Pacific Northwest (PNW) coast in November 1805, Lewis and Clarks’ Corps of Discovery experienced a two-day windstorm that may have rivaled the strongest historically documented storms of the nineteenth and twentieth centuries. Based on the Corps’ detailed historical accounts describing the event as the perfect storm, we characterized the severity of the 1805 windstorm using tree-ring growth anomalies from winds…
Vegetation Change and the Role of Atmospheric CO 2 Enrichment on a Relict Site in Central Oregon
Atmospheric CO2 enrichment is incresingly implicated as a contributory cause of vegetation change on North American rangelands. To explore the role of the rising CO2 content of the earth's atmosphere as an agent of vegetation change, we revisited (June 1994) the Island Research Natural Area (IRNA), a relict site of semiarid vegetation in central Oregon, to conduct a replicate survey of Driscoll's (1962) 1960 work. IRNA is one of the best non-labo…
Mammography in a health maintenance organization
The charts of a random sample of 496 women, aged 51 and older, in a staff model health maintenance organization (HMO) were retrospectively audited for mammography frequency over an 8-year period. Of the 496 women, 306 (61.7%) had at least one mammogram. For the 422 women who had been members of the HMO for at least 2 years, 196 (46.4%) had mammography within the previous 18 months
Vegetation Change and the Role of Atmospheric CO 2 Enrichment on a Relict Site in Central Oregon
Atmospheric CO2 enrichment is incresingly implicated as a contributory cause of vegetation change on North American rangelands. To explore the role of the rising CO2 content of the earth's atmosphere as an agent of vegetation change, we revisited (June 1994) the Island Research Natural Area (IRNA), a relict site of semiarid vegetation in central Oregon, to conduct a replicate survey of Driscoll's (1962) 1960 work. IRNA is one of the best non-labo…
Cheatgrass (Bromus tectorum L) dominance in the Great Basin Desert
Climatic Regionalization and the Spatio-Temporal Occurrence of Extreme Single-Year Drought Events (1500–1998) in the Interior Pacific Northwest, USA
Tree-ring records from western juniper ( Juniperus occidentalis var. occidentalis Hook.) growing throughout the interior Pacific Northwest identify extreme climatic pointer years (CPYs) (i.e., severe single-year droughts) from 1500–1998. Widespread and extreme CPYs were concentrated in the 16th and early part of the 17th centuries and did not occur again until the early 20th century. The 217-yr absence of extreme CPYs may have occurred during an …
Lewis and Clarks’ Tempest
Three weeks after arriving near the Pacific Northwest (PNW) coast in November 1805, Lewis and Clarks’ Corps of Discovery experienced a two-day windstorm that may have rivaled the strongest historically documented storms of the nineteenth and twentieth centuries. Based on the Corps’ detailed historical accounts describing the event as the perfect storm, we characterized the severity of the 1805 windstorm using tree-ring growth anomalies from winds…
Drought-Busting Tropical Cyclones in the Southeastern Atlantic United States
Droughts and tropical cyclones (TCs) are climatologically common events in the southeastern United States, yet little research has examined the potential for TCs to ameliorate drought impacts. Here, we identify the frequency of TCs that abruptly end drought conditions (i.e., drought busters, or DB) and determine possible influences of coupled ocean–atmosphere teleconnections on the likelihood of a TC-induced DB (TCDB). Using the HURDAT database a…
Spatiotemporal Changes in Comfortable Weather Duration in the Continental United States and Implications for Human Wellness
We examined the spatial distribution of monthly, seasonal, and annual changes in comfortable weather hours (CWHs) between 1950 and 2011 and explored the relationship between human wellness and the amount and timing of CWHs. Using a thermohygrometric index based on air temperature and dewpoint temperature recorded every three hours from thirty-five U.S. cities, we determined whether changes in human thermal comfort were coincident with warming and…
Climate-Growth Responses From Pinus Ponderosa Trees Using Multiple Measures of Annual Radial Growth
When using old-growth trees from semiarid, open-canopy environments, basal area increment (BAI), an absolute measure of radial growth, is sometimes used instead of the more commonly used ‘conservative techniques’ (negative exponential or linear regression with a negative slope; NegX) because narrow rings have been shown to potentially bias results. In this study we explore the relationship between radial growth of ponderosa pine from four study s…
Microelevational Differences Affect Longleaf Pine (Pinus palustris Mill.) Sensitivity to Tropical Cyclone Precipitation
Latewood ring widths of longleaf pine (Pinus palustris Mill.) growing on Carolina bay sand rims on the coastal plains of North Carolina are effective recorders of tropical cycone precipitation (TCP). Longleaf pine are hypothesized to be effective recorders of TCP because of their extensive lateral root structure that is exposed to enhanced soil moisture when TCP events raise the water table to root level, but this hypothesis has not been empirica…
The importance of infrequent, high-intensity rainfall events for longleaf pine (Pinus palustris Mill.) radial growth and implications for dendroclimatic research
Tree-ring based precipitation reconstructions are beneficial in placing interannual variability in an historical context. However, absent specificity on what is being modeled (e.g., event type or rainfall intensity), similar rainfall totals inferred from reconstructions between different years imply similar conditions. Consequently, variability in specific precipitation event types or intensity can affect radial growth widths despite no changes i…
Global Patterns of Antioxidant-Rich Food Crops Based on Geographical Origins
We mapped antioxidant values of 118 common food crops at a global scale based on geographical origins using median oxygen radical absorbance capacity (ORAC) and total phenolics (TP) for twenty-three regions to evaluate broad-scale patterns. Using the U.S. Department of Agriculture Food Composition Database we used k-means clustering to differentiate regions based on ORAC and TP values. Latitude is positively associated with ORAC (rs = 0.51, p < 0…
Geography (9 works) · Biology (6 works) · Climatology (6 works) · Meteorology (6 works) · Dendrochronology (5 works) · Environmental Science (5 works) · Plant Water Relations and Carbon Dynamics (5 works) · Tree-ring climate responses (5 works) · Botany (4 works) · Geology (4 works)