Carolina Tree-Ring Science Laboratory

Be Just and Good – Thomas Jefferson 1812


Recent Publications

Carolina Tree-Ring Science Laboratory affiliation in bold and former affiliation italicized 


Montpellier, E.E., Soule’ P.T., Knapp, P.A. and Shelly, J.S. Divergent growth rates of alpine larch trees in response to microenvironmental variability. Arctic, Antarctic, and Alpine Research 50 (1), e1415626 (9 pages),


Maxwell, J.T., Knapp, P.A., Ortegren, J.T., Ficklin, D. and Soule’ P.T. Changes in the mechanisms causing rapid drought cessation in the southeastern United States of America. Geophysical Research Letters DOI : 10.1002/2017GL076261

Knapp, P.A. and Soule’, P.T. Spatio-Temporal linkages between declining Arctic sea-ice extent and increasing wildfire activity in the western United States. Forests 8(9), 313; doi:10.3390/f8090313.


Patterson, T.W. and Knapp, P.A. Scientific Note: Stand dynamics influence masting/radial growth relationships in Pinus palustris Mill.  Castanea  81(4) 314–322.

Hadley, K.S. and Knapp, P.A. Post-windstorm radial growth of Picea sitchensis and Pseudotsuga menziesii. MadroñoA West American Journal of Botany 63:234–248.

Knapp, P.A., Maxwell, J.T. and Soulé, P.T. Tropical cyclone rainfall variability in coastal North Carolina derived from longleaf pine (Pinus palustris Mill.): AD 1771–2014. Climatic Change 135:311–323.

Knapp, P.A., Maxwell, J.T., Ortegren, J.O. and Soulé, P.T. Spatio-temporal changes in comfortable weather duration in the continental U.S. and implications for human wellness. Annals of the Association of American Geographers 106:1–18

Patterson, T.W. and Knapp, P.A. Observations on a Rare Old-Growth Montane Longleaf Pine Forest in Central North Carolina. Natural Areas Journal. 36(2) 153–161.

Patterson, T.W., Cummings, L.W., and Knapp, P.A. Longleaf pine (Pinus palustris Mill.) morphology and climate/growth responses along a physiographic gradient in North Carolina. The Professional Geographer. 68(2) 238–248.


 Soulé, P.T. and Knapp, P.A. Sesquicentennial trends in intrinsic water-use efficiency: Analyses of intrinsic water-use efficiency indicate performance differences of ponderosa pine and Douglas-fir in response to CO2 enrichment. Journal of Biogeography 42: 144–155.


Patterson, T.W. Geographic Pattern Analysis of North Carolina Climate Division Data 1895–2013. Southeastern Geographer 54-3: 308–322.


Maxwell, J.T., Knapp, P.A. and Ortegren, J.T. Influence of the Atlantic multidecadal oscillation on tupelo honey production from AD 1800-2010. Agricultural and Forest Meteorology 174–175:129–134.

Knapp, P.A., Soulé, P.T. and Maxwell, J.T. Mountain pine beetle selectivity in old-growth ponderosa pine forests, Montana, USA. Ecology and Evolution, doi: 10.1002/ece3.522.

Soulé, P.T. and Knapp P.A. Radial growth rates of two co-occurring coniferous trees in the Northern Rockies during the past century. Journal of Arid Environments 94:87-95.


Knapp, P.A. and Hadley, K.S. A 300-Year History of Pacific Northwest Windstorms Inferred from Tree Rings. Global and Planetary Change 92-93: 257-266

Maxwell, J.T., and Knapp, P.A. Reconstructed tupelo-honey yield in northwest Florida inferred from Nyssa Ogeche tree-ring data: 1850–2009. Agriculture, Ecosystems, and Environment 149: 100–108.

Knapp, P.A., and Soulé, P.T. Reconstructing annual area burned in the northern Rockies, USA: AD 1626–2008.Geophysical Research Letters 38: L17402, doi:10.1029/2011GL048119.

Soulé, P.T. and Knapp, P.A. Radial growth and increased water-use efficiency for ponderosa pine trees in three regions in the western United States. The Professional Geographer 63: 1–13.

Knapp, P.A., and Hadley, K.S. Lewis and Clarks’ Tempest: The Perfect Storm of November, 1805, Oregon, USA.The Holocene 21: 693–697.

Hadley, K.S. and Knapp, P.A. Detection of high-wind events using tree-ring data. Canadian Journal of Forest Research 41: 1121–1129.

Knapp, P.A., and Soulé, P.T. Increasing water-use efficiency and age-specific growth responses of old-growth ponderosa pine trees in the Northern Rockies. Global Change Biology 17: 631–641.