TY - JOUR A1 - Harris, A. A1 - Gamon, J. A. A1 - Pastorello, G. Z. A1 - Wong, C. Y. S. T1 - Retrieval of the photochemical reflectance index for assessing xanthophyll cycle activity: a comparison of near-surface optical sensors JO - Biogeosciences J1 - BG VL - 11 IS - 22 SP - 6277 EP - 6292 Y1 - 2014/11/21 PB - Copernicus Publications SN - 1726-4189 UR - https://bg.copernicus.org/articles/11/6277/2014/ L1 - https://bg.copernicus.org/articles/11/6277/2014/bg-11-6277-2014.pdf DO - 10.5194/bg-11-6277-2014 ER -