2011
Wang, P., W. H Knap and P. Stammes. 2011. Cloudy-sky shortwave radiative closure for a Baseline Surface Radiation Network site. J. Geophys. Res, 116, D08202, doi:10.1029/2010JD015141. (741 kB).

2010
Brandau, C.L., H. W. J. Russchenberg, W. H. Knap. 2010. Evaluation of ground-based remotely sensed liquid water cloud properties using shortwave radiation measurements, Atmos. Res., doi:10.1016/j.atmosres.2010.01.009.
(1.6 MB).

2009
Deneke H. M., W. H. Knap, C. Simmer (2009), Multiresolution analysis of the temporal variance and correlation of transmittance and reflectance of an atmospheric column, J. Geophys. Res., 114, D17206, doi:10.1029/2008JD011680. (515 kB).

Wang, P., W. H. Knap, P. Kuipers Munneke, and P. Stammes. 2009. Clear-sky shortwave radiative closure for the Cabauw Baseline Surface Radiation Network site, Netherlands, J. Geophys. Res., 114, D14206, doi:10.1029/2009JD011978. (662 kB).

2008
Wang, P., W. H. Knap, P. Kuipers Munneke, P. Stammes. 2008. Clear-sky Atmospheric Radiative Transfer: A Model Intercomparison for Shortwave Irradiances. Proceedings of the International Radiation Symposium (IRS-2008). (128 kB).

Brandau, C., H. W. J. Russchenberg, W. H. Knap. 2008. Evaluation of ground-based remotely sensed water cloud properties using radiation and aircraft in-situ measurements. Proceedings of the International Conference on Clouds and Precipitation (ICCP-2008). (1.27 MB).

Kuipers Munneke, P., C. H. Reijmer, M. R. van den Broeke, G. König-Langlo, P. Stammes, and W. H. Knap. 2008. Analysis of clear-sky Antarctic snow albedo using observations and radiative transfer modeling, J. Geophys. Res., 113, D17118, doi:10.1029/2007JD009653. (8.57 MB).

Boesche, E., P. Stammes, R. Preusker, R. Bennartz, W. H. Knap, J. Fischer. 2008. Polarization of skylight in the O2A-band: effects of aerosol properties. Applied Optics, 47(19), 3467-3480. (4.00 MB).

Brinksma, E., G. Pinardi, R. Braak, H. Volten, A. Richter, A. Schonhardt, M. Van Roozendael, C. Fayt, C. Hermans, R. Dirksen, T. Vlemmix, A.J.C Berkhout, D.P.J. Swart, H. Oetjen, F. Wittrock, T. Wagner, O. W. Ibrahim, G. de Leeuw, M. Moerman, L. Curier, E. A. Celarier, W. H. Knap, J. P. Veefkind, H.J. Eskes, M. Allaart, R. Rothe, A. J. M. Piters, P. Levelt . 2008. The 2005 and 2006 DANDELIONS NO2 and Aerosol Intercomparison Campaigns. Journal of Geophysical Research, doi:10.1029/2007JD008808. (2.22 MB)

2007
Knap, W. H., J. Bijma, Y. B. L. Hinssen, A. Los, C. van Oort, J. Warmer, E. Worrell. 2007. The Baseline Surface Radiation Network (BSRN) station at the Cabauw Observatory.  KNMI Biennial Scientific Report 2005-2006, 18-23. (3.04 MB).

Zadelhoff, G. J. van, E. van Meijgaard, D. P. Donovan, W. H. Knap, R. Boers. 2007. Sensitivity of the shortwave radiative budget to the parameterization of ice crystal effective radius. Journal of Geophysical Research, doi:10.1029/2006JD007791. (1.02 MB)

Hinssen, Y. B. L., W. H. Knap. 2007. Comparison of pyranometric and pyrheliometric methods for the determination of sunshine duration. Journal of Atmospheric and Oceanic Technology , 24(5), 835-846. (1.02MB)

2005
Knap, W. H., L. C.-Labonnote, G. Brogniez, P. Stammes. 2005. Modeling total and polarized reflectances of ice clouds: evaluation by means of POLDER and ATSR-2 measurements. Applied Optics, 44(19), 4060-4073. (2.48 MB).

Knap, W. H.,  P. Stammes, G. de Leeuw. 2005. Sunphotometry in the Netherlands and Suriname.  WMO/GAW experts workshop on a global surface-based network for long term observations of column aerosol optical propteries, Davos, Switzerland, 8-10 March 2004.  WMO TD No. 1287, 72-74. (201 kB).

2004
Accareta, J. R., P. Stammes, W. H. Knap. 2004. First retrieval of cloud phase from SCIAMACHY spectra around 1.6 micron. Atmospheric Research, 72, 89-105.
(576 kB).

Henzing, J. S., W. H. Knap, P. Stammes, H. M. ten Brink, G. P. A. Kos, D. P. J. Swart, A. Apituley, J. B. Bergwerff. 2004. The effect of aerosols on the downward shortwave irradiances at the surface – measurements versus calculations with MODTRAN4.1. Journal of Geophysical Research, doi:10.1029/2003JD004142.
(392 kB).

2003
Knap, W. H., A. Los, E. Worrell, P. Stammes. 2003. Sunphotometry at the High Altitude Research Station Jungfraujoch. Activity Report 2003 of the International Foundation HFSJG. (303 kB).

2002
Knap, W. H., P. Stammes, R. B. A. Koelemeijer. 2002. Cloud thermodynamic phase determination from near-infrared spectra of reflected sunlight. Journal of the Atmospheric Sciences, 59(1), 83-96. (683 kB).

2001
Henzing, J. S., W. H. Knap. 2001. Uncertainty in pyranometer and pyrheliometer measurements at KNMI in De Bilt. KNMI Technical Report TR-235.

Henzing, J. S., W. H. Knap, P. Stammes, H. M. ten Brink, G. P. A. Kos, D. P. J. Swart, A. Apituley, J. B. Bergwerff, 2001. The effect of aerosol on closure of the regional short-wave radiation balance. NOP report no.: 410 200 087.

Knap, W. H., P. Stammes, and R.B.A. Koelemeijer. 2001. Cloud-phase determination using near-infrared AVIRIS measurements. In: IRS 2000: Current Problems in Atmospheric Radiation, W. L. Smith and Yu. M. Timofeyev (Eds.). A. Deepak Publishing, Hampton, Virginia. pp. 941-944.

2000
Stammes, P., W. H. Knap, R. B. A. Koelemeijer, N. A. J. Schutgens. 2000. Radiation and cloud studies with GOME in preparation for future spectrometer missions. Proceedings of the ERS-Envisat Symposium 2000, European Space Agency.

Knap, W. H., P. Stammes, R. B. A. Koelemeijer. 2000. Discriminating between water and ice clouds using near-infrared AVIRIS measurements. Proceedings of the 9th AVIRIS Earth Science and Applications Workshop, NASA Jet Propulsion Laboratory, Pasadena, USA, 23-25 February 2000.

Greuell, W., W. H. Knap. 2000. Remote sensing of the albedo and detection of the slush line on the Greenland ice sheet. Journal of Geophysical Research, 105(D12), 15,567-15,576.

1999
Knap, W. H., M. Hess, P. Stammes, R. B. A. Koelemeijer, P. D. Watts. 1999. Cirrus optical thickness and crystal size retrieval from ATSR-2 data using phase functions of imperfect hexagonal ice crystals. Journal of Geophysical Research, 104(D24), 31,721-31,730. (3.29 MB).

Knap, W. H., P. Stammes, R. B. A. Koelemeijer. 1999. The effect of crystal shape on the retrieval of cirrus crystal size and optical thickness from ATSR-2 data. Proceedings of AMS 10th conference on atmospheric radiation, Madison, Wisconsin, USA, 28 June - 2 July 1999, 165-168.

Knap, W. H., B. W. Brock, J. Oerlemans, I. C. Willis. 1999. Comparison of Landsat-TM derived and ground-based albedo of Haut Glacier d'Arolla. International Journal of Remote Sensing., 20(17), 3293-3310. (7.2 MB).

Knap, W. H., C. H. Reijmer, J. Oerlemans. 1999. Narrowband to broadband conversion of Landsat-TM glacier albedos. International Journal of Remote Sensing, 20(10), 2091-2110. (1.2 MB).

Reijmer, C. H., W. H. Knap, J. Oerlemans. 1999. The surface albedo of the Vatnajökull ice cap, Iceland: A comparison between satellite-derived and ground-based measurements. Boundary Layer Meteorology, 92(1), 125-144.
(418 kB).

1998
Knap, W. H., M. Hess, P. Stammes, R. B. A. Koelemeijer, P. D. Watts. 1998. Interpretation of ATSR-2 measurements of cirrus clouds using phase functions of imperfect hexagonal ice crystals. Proc. SPIE Int. Soc. Opt. Eng.,  3495, 51-60.

Knap, W. H., C. H. Reijmer. 1998. Anisotropy of the reflected radiation field over melting glacier ice: measurements in Landsat-TM bands 2 and 4. Remote Sensing of Environment, 65, 93-104. (927 kB).

Oerlemans, J., W. H. Knap. 1998. A one-year record of global radiation and albedo in the ablation zone of the Morteratschgletscher, Switzerland. Journal of Glaciology. 44(147), 231-238.

Oerlemans, J., B. Anderson, A. Hubbard, Ph. Huybrechts, T. Jóhanneson, W. H. Knap , M. Schmeits, A. P. Stroeven, R. S. W. van de Wal, J. Wallinga, Z. Zuo. 1998. Modelling the response of glaciers to climate warming. Climate Dynamics, 14, 267-274. (456 kB).

1997
Knap, W. H. 1997. Satellite-derived and ground-based measurements of the surface albedo of glaciers. PhD-thesis Utrecht University, The Netherlands. 175 pp. ISBN90-393-1983-9.

Bintanja, R., S. Johnsson, W. H. Knap. 1997. The annual cycle of the surface energy balance of Antarctic blue ice. Journal of Geophysical Research, 102(D2), 1867-1881.

Greuell, W., W. H. Knap, P. C. Smeets. 1997. Elevational changes in meteorological variables along a mid-latitude glacier during summer. Journal of Geophysical Research, 102(D22), 25941-25954.

1996
Knap, W. H., J. Oerlemans, M. Cadée. 1996. Climate sensitivity of the ice cap of King George Island, South Shetland Islands, Antarctica. Annals of Glaciology, 23, 154-159. (3.1 MB)

Knap, W. H., J. Oerlemans. 1996. The surface albedo of the Greenland ice sheet: satellite-derived and in situ measurements in the Søndre Strømfjord area during the 1991 melt season. Journal of Glaciology, 42(141), 364-374.  (1.2 MB)

Wal, R. S. W. van de, R. Bintanja, W. Boot, M. R. van den Broeke, L. A. Conrads, P. G. Duynkerke, P. Fortuin, E. A. C. Henneken, W. H. Knap, M. Portanger, H. F. Vugts, J. Oerlemans. 1996. Mass balance measurements in the Søndre Strømfjord area in the period 1990-1994. Zeitschrift für Gletscherkunde und Glazialgeologie, 31, 75-63.

Prior to 1996
Knap, W. H. 1992. A study on the albedo and energy balance of an alpine snow field in the winter season. IMAU Report V92-12, Institute for Marine and Atmospheric Research, Utrecht, Netherlands, 68 pp.