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Berkelhammer, M., J. Hu, A. Bailey, D. C. Noone, C. J. Still, H. Barnard, D. Gochis, G. S. Hsiao, T. Rahn, and A. Turnipseed, 2013: The nocturnal water cycle in an open-canopy forest. J. Geophys. Res. Atmos., 118, 10,225-10,242, doi: 10.1002/jgrd.50701. Chan, A. W.H., N. M. Kreisberg, T. Hohaus, P. Campuzano-Jost, Y. Zhao, D. A. Day, L. Kaser, T. Karl, A. Hansel, A. P. Teng, C. R. Ruehl, D. T. Sueper, J. T. Jayne, D. R. Worsnop, J. L. Jimenez, S. V. Hering, and A. H. Goldstein, 2016: Speciated measurements of semivolatile and intermediate volatility organic compounds (S/IVOCs) in a pine forest during BEACHON-RoMBAS 2011. Atmos. Chem. Phys., 16, 1187–1205, doi: 10.5194/acp-16-1187-2016. Crawford, I., N. H. Robinson, M. J. Flynn, V. E. Foot, M. W. Gallagher, J. A. Huffman, W. R. Stanley, and P. H. Kaye, 2014: Characterisation of bioaerosol emissions from a Colorado pine forest: results from the BEACHON-RoMBAS experiment. Atmos. Chem. Phys., 14, 8559–8578, doi: 10.5194/acp-14-8559-2014. Cui, Y. Y., A. Hodzic, J. N. Smith, J. Ortega, J. Brioude, H. Matsui, E. J.T. Levin, A. Turnipseed, P. Winkler, and B. de Foy, 2014: Modeling ultrafine particle growth at a pine forest site influenced by anthropogenic pollution during BEACHON-RoMBAS 2011. Atmos. Chem. Phys., 14, 11011–11029, doi: 10.5194/acp-14-11011-2014. DiGangi, J. P., E. S. Boyle, T. Karl, P. Harley, A. Turnipseed, S. Kim, C. Cantrell, R. L. Maudlin III, W. Zheng, F. Flocke, S. R. Hall, K. Ullmann, Y. Nakashima, J. B. Paul, G. M. Wolfe, A. R. Desai, Y. Kajii, A. Guenther, and F. N. Keutsch, 2011: First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources. Atmos. Chem. Phys., 11, 10565–10578, doi: 10.5194/acp-11-10565-2011. DiGangi, J. P., S. B. Henry, A. Kammrath, E. S. Boyle, L. Kaser, R. Schnitzhofer, M. Graus, A. Turnipseed, J-H. Park, R. J. Weber, R. S. Hornbrook, C. A. Cantrell, R. L. Maudlin III, S. Kim, Y. Nakashima, G. M. Wolfe, Y. Kajii, E. C. Apel, A. H. Goldstein, A. Guenther, T. Karl, A. Hansel, and F. N. Keutsch, 2012: Observations of glyoxal and formaldehyde as metrics for the anthropogenic impact on rural photochemistry. Atmos. Chem. Phys., 12, 9529–9543, doi: 10.5194/acp-12-9529-2012. Eidhammer, T., M. C. Barth, M. D. Petters, C. Wiedinmyer, and A. J. Prenni, 2014: Aerosol microphysical impact on summertime convective precipitation in the Rocky Mountain region. J. Geophys. Res. Atmos., 119, 11,709-11,728, doi: 10.1002/2014JD021883. Fry, J. L., D. C. Draper, K. J. Zarzana, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, S. S. Brown, R. C. Cohen, L. Kaser, A. Hansel, L. Cappellin, T. Karl, A. Hodzic Roux, A. Turnipseed, C. Cantrell, B. L. Lefer, and N. Grossberg, 2013: Observations of gas- and aerosol-phase organic nitrates at BEACHON-RoMBAS 2011. Atmos. Chem. Phys., 13, 8585–8605, doi: 10.5194/acp-13-8585-2013. Fulgham, S. R., P. Brophy, M. Link, J. Ortega, I. Pollack, and D. K. Farmer, 2019: Seasonal Flux Measurements over a Colorado Pine Forest Demonstrate a Persistent Source of Organic Acids. ACS Earth Space Chem., 3, 9, 2017–2032, doi: 10.1021/acsearthspacechem.9b00182. Gosselin, M. I., C. M. Rathnayake, I. Crawford, C. Pöhlker, J. Fröhlich-Nowoisky, B. Schmer, V. R. Després, G. Engling, M. Gallagher, E. Stone, U. Pöschl, and J. A. Huffman, 2016: Fluorescent bioaerosol particle, molecular tracer, and fungal spore concentrations during dry and rainy periods in a semi-arid forest. Atmos. Chem. Phys., 16, 15165-15184, doi: 10.5194/acp-16-15165-2016. Huffman, J. A., A. J. Prenni, P. J. DeMott, C. Pöhlker, R. H. Mason, N. H. Robinson, J. Fröhlich-Nowoisky, Y. Tobo, V. R. Després, E. Garcia, D. J. Gochis, E. Harris, I. Müller-Germann, C. Ruzene, B. Schmer, B. Sinha, D. A. Day, M. O. Andreae, J. L. Jimenez, M. Gallagher, S. M. Kreidenweis, A. K. Bertram, and U. Pöschl, 2013: High concentrations of biological aerosol particles and ice nuclei during and after rain. Atmos. Chem. Phys., 13, 6151–6164, doi: 10.5194/acp-13-6151-2013. Hunter, J. F., D. A. Day, B. B. Palm, R. L. N. Yatavelli, A. W. H. Chan, L. Kaser, L. Cappellin, P. L. Hayes, E. S. Cross, A. J. Carrasquillo, P. Campuzano-Jost, H. Stark, Y. Zhao, T. Hohaus, J. N. Smith, A. Hansel, T. Karl, A. H. Goldstein, A. Guenther, D. R. Worsnop, J. A. Thornton, C. L. Heald, J. L. Jimenez, and J. H. Kroll, 2017: Comprehensive characterization of atmospheric organic carbon at a forested site. Nature Geosci, 10, 748–753, doi: 10.1038/ngeo3018. Karl, T., A. Hansel, L. Cappellin, L. Kaser, I. Herdlinger-Blatt, and W. Jud, 2012: Selective measurements of isoprene and 2-methyl-3-buten-2-ol based on NO+ ionization mass spectrometry. Atmos. Chem. Phys., 12, 11877–11884, doi: 10.5194/acp-12-11877-2012. Kaser, L., T. Karl, A. Guenther, M. Graus, R. Schnitzhofer, A. Turnipseed, L. Fischer, P. Harley, M. Madronich, D. Gochis, F. N. Keutsch, and A. Hansel, 2013: Undisturbed and disturbed above canopy ponderosa pine emissions: PTR-TOF-MS measurements and MEGAN 2.1 model results. Atmos. Chem. Phys., 13, 11935–11947, doi: 10.5194/acp-13-11935-2013. Kim, S., G. M. Wolfe, L. Mauldin, C. Cantrell, A. Guenther, T. Karl, A. Turnipseed, J. Greenberg, S. R. Hall, K. Ullmann, E. Apel, R. Hornbrook, Y. Kajii, Y. Nakashima, F. N. Keutsch, J. P. DiGangi, S. B. Henry, L. Kaser, R. Schnitzhofer, M. Graus, A. Hansel, W. Zheng, and F. F. Flocke, 2013: Evaluation of HOx sources and cycling using measurement-constrained model calculations in a 2-methyl-3-butene-2-ol (MBO) and monoterpene (MT) dominated ecosystem. Atmos. Chem. Phys., 13, 2031–2044, doi: 10.5194/acp-13-2031-2013. Kim, S., T. Karl, A. Guenther, G. Tyndall, J. Orlando, P. Harley, R. Rasmussen, and E. Apel, 2010: Emissions and ambient distributions of Biogenic Volatile Organic Compounds (BVOC) in a ponderosa pine ecosystem: interpretation of PTR-MS mass spectra. Atmos. Chem. Phys., 10, 1759–1771, doi: 10.5194/acp-10-1759-2010. Levin, E. J. T., A. J. Prenni, B. B. Palm, D. A. Day, P. Campuzano-Jost, P. M. Winkler, S. M. Kreidenweis, P. J. DeMott, J. L. Jimenez, and J. N. Smith, 2014: Size-resolved aerosol composition and its link to hygroscopicity at a forested site in Colorado. Atmos. Chem. Phys., 14, 2657–2667, doi: 10.5194/acp-14-2657-2014. Levin, E. J. T., A. J. Prenni, M. D. Petters, S. M. Kreidenweis, R. C. Sullivan, S. A. Atwood, J. Ortega, P. J. DeMott, and J. N. Smith, 2012: An annual cycle of size-resolved aerosol hygroscopicity at a forested site in Colorado. J. Geophys. Res. Atmos., 117, doi: 10.1029/2011JD016854. Nakashima, Y., S. Kato, J. Greenberg, P. Harley, T. Karl, A. Turnipseed, E. Apel, A. Guenther, J. Smith, and Y. Kajii, 2014: Total OH reactivity measurements in ambient air in a southern Rocky mountain ponderosa pine forest during BEACHON-SRM08 summer campaign. Atmos. Environ., 85, 1-8, doi: 10.1016/j.atmosenv.2013.11.042. Ortega, J., A. Turnipseed, A. B. Guenther, T. G. Karl, D. A. Day, D. Gochis, J. A. Huffman, A. J. Prenni, E. J. T. Levin, S. M. Kreidenweis, P. J. DeMott, Y. Tobo, E. G. Patton, A. Hodzic, Y. Y. Cui, P. C. Harley, R. S. Hornbrook, E. C. Apel, R. K. Monson, A. S. D. Eller, J. P. Greenberg, M. C. Barth, P. Campuzano-Jost, B. B. Palm, J. L. Jimenez, A. C. Aiken, M. K. Dubey, C. Geron, J. Offenberg, M. G. Ryan, P. J. Fornwalt, S. C. Pryor, F. N. Keutsch, J. P. DiGangi, A. W. H. Chan, A. H. Goldstein, G. M. Wolfe, S. Kim, L. Kaser, R. Schnitzhofer, A. Hansel, C. A. Cantrell, R. L. Mauldin, and J. N. Smith, 2014: Overview of the Manitou Experimental Forest Observatory: site description and selected science results from 2008 to 2013. Atmos. Chem. Phys., 14, 6345–6367, doi: 10.5194/acp-14-6345-2014. Palm, B. B., P. Campuzano-Jost, A. M. Ortega, D. A. Day, L. Kaser, W. Jud, T. Karl, A. Hansel, J. F. Hunter, E. S. Cross, J. H. Kroll, Z. Peng, W. H. Brune, and J. L. Jimenez, 2016: In situ secondary organic aerosol formation from ambient pine forest air using an oxidation flow reactor. Atmos. Chem. Phys., 16, 2943–2970, doi: 10.5194/acp-16-2943-2016. Palm, B. B., P. Campuzano-Jost, D. A. Day, A. M. Ortega, J. L. Fry, S. S. Brown, K. J. Zarzana, W. Dube, N. L. Wagner, D. C. Draper, L. Kaser, W. Jud, T. Karl, A. Hansel, C. Gutiérrez-Montes, and J. L. Jimenez, 2017: Secondary organic aerosol formation from in situ OH, O3, and NO3 oxidation of ambient forest air in an oxidation flow reactor. Atmos. Chem. Phys., 17, 5331–5354, doi: 10.5194/acp-17-5331-2017. Prenni, A. J., Y. Tobo, E. Garcia, P. J. DeMott, J. A. Huffman, C. S. McCluskey, S. M. Kreidenweis, J. E. Prenni, C. Pöhlker, and U. Pöschl, 2013: The impact of rain on ice nuclei populations at a forested site in Colorado. Geophys. Res. Lett., 40, 227-231, doi: 10.1029/2012GL053953. Rhew, R. C., M. J. Deventer, A. A. Turnipseed, C. Warneke, J. Ortega, S. Shen, L. Martinez, A. Koss, B. M. Lerner, J. B. Gilman, J. N. Smith, A. B. Guenther, and J. A. de Gouw, 2017: Ethene, propene, butene and isoprene emissions from a ponderosa pine forest measured by relaxed eddy accumulation. Atmos. Chem. Phys., 17, 13417–13438, doi: 10.5194/acp-17-13417-2017. Robinson, N. H., J. D. Allan, J. A. Huffman, P. H. Kaye, V. E. Foot, and M. Gallagher, 2013: Cluster analysis of WIBS single-particle bioaerosol data. Atmos. Meas. Tech., 6, 337–347, doi: 10.5194/amt-6-337-2013. Schumacher, C. J., C. Pöhlker, P. Aalto, V. Hiltunen, T. Petäjä, M. Kulmala, U. Pöschl, and J. A. Huffman, 2013: Seasonal cycles of fluorescent biological aerosol particles in boreal and semi-arid forests of Finland and Colorado. Atmos. Chem. Phys., 13, 11987–12001, doi: 10.5194/acp-13-11987-2013. Tobo, Y., A. J. Prenni, P. J. DeMott, J. A. Huffman, C. S. McCluskey, G. Tian, C. Pöhlker, U. Pöschl, and S. M. Kreidenweis, 2013: Biological aerosol particles as a key determinant of ice nuclei populations in a forest ecosystem. J. Geophys. Res. Atmos., 118, 10,100-10,110, doi: 10.1002/jgrd.50801. Vörösmarty, C. J., P. B. McIntyre, M. O. Gessner, D. Dudgeon, A. Prusevich, P. Green, S. Glidden, S. E. Bunn, C. A. Sullivan, C. Reidy Liermann, and P. M. Davies, 2010: Global threats to human water security and river biodiversity. Nature, 467, 555–561, doi: 10.1038/nature09440. Wolfe, G. M., C. Cantrell, S. Kim, R. L. Mauldin III, T. Karl, P. Harley, A. Turnipseed, W. Zheng, F. Flocke, E. C. Apel, R. S. Hornbrook, S. R. Hall, K. Ullmann, S. B. Henry, J. P. DiGangi, E. S. Boyle, L. Kaser, R. Schnitzhofer, A. Hansel, M. Graus, Y. Nakashima, Y. Kajii, A. Guenther, and F. N. Keutsch, 2014: Missing peroxy radical sources within a summertime ponderosa pine forest. Atmos. Chem. Phys., 14, 4715–4732, doi: 10.5194/acp-14-4715-2014. Yatavelli, R. L. N., C. Mohr, H. Stark, D. A. Day, S. L. Thompson, F. D. Lopez-Hilfiker, P. Campuzano-Jost, B. B. Palm, A. L. Vogel, T. Hoffmann, L. Heikkinen, M. Äijälä, N. L. Ng, J. R. Kimmel, M. R. Canagaratna, M. Ehn, H. Junninen, M. J. Cubison, T. Petäjä, M. Kulmala, J. T. Jayne, D. R. Worsnop, and J. L. Jimenez, 2015: Estimating the contribution of organic acids to northern hemispheric continental organic aerosol. Geophys. Res. Lett., 42, 6084-6090, doi: 10.1002/2015GL064650. Yatavelli, R. L. N., H. Stark, S. L. Thompson, J. R. Kimmel, M. J. Cubison, D. A. Day, P. Campuzano-Jost, B. B. Palm, A. Hodzic, J. A. Thornton, J. T. Jayne, D. R. Worsnop, and J. L. Jimenez, 2014: Semicontinuous measurements of gas–particle partitioning of organic acids in a ponderosa pine forest using a MOVI-HRToF-CIMS. Atmos. Chem. Phys., 14, 1527–1546, doi: 10.5194/acp-14-1527-2014. Zhang, H., D. R. Worton, M. Lewandowski, J. Ortega, C. L. Rubitschun, J.-H. Park, K. Kristensen, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, M. Jaoui, J. H. Offenberg, T. E. Kleindienst, J. Gilman, W. C. Kuster, J. de Gouw, C. Park, G. W. Schade, A. A. Frossard, L. Russell, L. Kaser, W. Jud, A. Hansel, L. Cappellin, T. Karl, M. Glasius, A. Guenther, A. H. Goldstein, J. H. Seinfeld, A. Gold, R. M. Kamens, and J. D. Surratt, 2012: Organosulfates as Tracers for Secondary Organic Aerosol (SOA) Formation from 2-Methyl-3-Buten-2-ol (MBO) in the Atmosphere. Environ. Sci. Technol., 46(17), 9437–9446, doi: 10.1021/es301648z. Zhang, H., Z. Zhang, T. Cui. Y.-H. Lin, N. A. Bhathela, J. Ortega, D. R. Worton, A. H. Goldstein. A. Guenther, J. L. Jimenez, A. Gold, and J. D. Surratt, 2014: Secondary Organic Aerosol Formation via 2-Methyl-3-buten-2-ol Photooxidation: Evidence of Acid-Catalyzed Reactive Uptake of Epoxides. Environ. Sci. Technol. Lett., 1(4), 242–247, doi: 10.1021/ez500055f. Zhou, L., R. Gierens, A. Sogachev, D. Mogensen, J. Ortega, J. N. Smith, P. C. Harley, A. J. Prenni, E. J. T. Levin, A. Turnipseed, A. Rusanen, S. Smolander, A. B. Guenther, M. Kulmala, T. Karl, and M. Boy, 2015: Contribution from biogenic organic compounds to particle growth during the 2010 BEACHON-ROCS campaign in a Colorado temperate needleleaf forest. Atmos. Chem. Phys., 15, 8643–8656, doi: 10.5194/acp-15-8643-2015.