Remote sensing reflectance (Rrs) of the surface water of the Mackenzie Delta Region during 4 expeditions from spring to fall in 2019

• Main Authors: Matsuoka, Atsushi, Juhls, Bennet, Bécu, Guislain, Oziel, Laurent, Leymarie, Edouard, Lizotte, Martine, Ferland, Joannie, Doxaran, David, Maury, Juliette, Babin, Marcel
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: 1_STN01; 1_STN020; 1_STN040; 1_STN0a; 1_STN0b; 1_STN140alt; 1_STN150alt; 1_STN340alt; 1_STN350; 1_STN360; 1_STN370alt; 1_STN380alt; 1_STN540alt; 1_STN550; 1_STN740; 1_STN810; 1_STN830; 1_STN840; 1_STN850; 1_STN860; 1_STN870; 2_STN030; 2_STN040; 2_STN1030; 2_STN1040; 2_STN1050; 2_STN1060; 2_STN110; 2_STN120; 2_STN140alt; 2_STN150alt; 2_STN310; 2_STN320; 2_STN330; 2_STN340alt; 2_STN350; 2_STN360; 2_STN370; 2_STN380alt_2; 2_STN420; 2_STN430; 2_STN450; 2_STN530; 2_STN540alt; 2_STN550; 2_STN565; 2_STN620; 2_STN630; 2_STN740; 2_STN800; Arctic; Mackenzie Delta
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.937583; https://doi.org/10.1594/PANGAEA.937583

Vertical profiles of downwelling irradiance (Ed) and upwelling radiance (Lu) were measured during legs 2, 3, and 4 using a Compact-Optical Profiling System (C-OPS) in an ICE-Pro frame from Biospherical Instruments, Inc. (for a detailed description see Morrow et al. 2010 (see further details)). Additionally, above-surface incident downward irradiance (Es(0+)) was measured at about two meters above sea level and was used to correct in-water Ed and Lu for changes in the incident light field during Lu profiling (Zibordi et al., 2019; doi:10.25607/OBP-691). All radiometric quantities were measured at 19 wavelengths spanning from 380 to 875 nm. In-water profiles were obtained from the boat using a 3 m long pole, deployed towards the sun to avoid shading from the boat. The data that were acquired with a tilt of more than 5 degrees were discarded (Hooker et al., 2013; doi:10.5194/bg-10-4511-2013). Due to the high absorption and scattering coefficients in the sampled waters and considering relatively large dimensions of the ICE-Pro, self-shading correction was not negligible. Absorption observed in the present study were mostly outside the limits examined by Gordon and Ding (1992; doi:10.4319/lo.1992.37.3.0491), suggesting the application of the correction questionable. To overcome this issue, we performed Monte-Carlo simulations using the SimulO software (Leymarie et al., 2010; doi:10.1364/AO.49.005415) for examining the self-shading correction factor on Lu at null depth (Gerbi et al., 2016 (doi:10.1175/JTECH-D-16-0067.1); Leymarie et al., 2018 (doi:10.3389/fmars.2018.00437)). The exact dimensions of the ICE-Pro were simulated and virtually placed at a depth of 0.5 m. A wide range of IOPs was considered to cover the conditions encountered in the field. The simulations provide a robust relationship between the computed self-shading and the quantity x = a + bb, where a is the total measured absorption coefficient (i.e., the contributions of pure water, CDOM, algal and non-algal particles) and bb is the total ...